diff --git a/AGENTS.md b/AGENTS.md
index 3b12185bea..8b04878596 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -52,7 +52,7 @@ pnpm run demo:acp       # ACP server agent (needs DEEPSEEK_API_KEY)
 
 ### Run the CI gates locally before marking a PR ready
 
-CI is the backstop, not the first run. From a fresh clone or worktree, `pnpm run build` first — publint and the NodeNext check validate built `lib/`. The CI-equivalent run:
+From a fresh clone or worktree, `pnpm run build` first — publint and the NodeNext check validate built `lib/`. The CI-equivalent run:
 
 ```sh
 set -euo pipefail
@@ -72,7 +72,7 @@ rm -rf .sessions
 pnpm exec vitest run --config vitest.e2e.config.ts packages/ui/stdio-agent/tests/built-bin.e2e.ts packages/ui/acp-agent/tests/built-bin.e2e.ts
 ```
 
-`test:coverage`, not `test`, is the gating run ([why](docs/testing.md)); a review sign-off counts only for the commands it actually ran.
+`test:coverage`, not `test`, is the gating run ([why](docs/testing.md)); a sign-off counts only for commands actually run.
 
 ## Secrets / .env
 
@@ -81,18 +81,19 @@ Real-API tests and demos read `DEEPSEEK_API_KEY` (and optional `DEEPSEEK_BASE_UR
 ## Conventions
 
 - Every npm package is `@deepseek-ai/dsh-<name>`; vendored packages keep upstream names and are `private: true`. `cordis` is a peerDependency (+ dev) of every harness package.
-- ESM everywhere (`"type": "module"`). Cross-package imports use package names, never relative paths; in-package relative imports use explicit `.ts` extensions. Dev/test/demo run unbuilt via tsx + the root tsconfig `paths` map; building is only for consumers outside the repo.
+- ESM everywhere (`"type": "module"`). Cross-package imports use package names, never relative paths; in-package relative imports use explicit `.ts` extensions. Dev/test/demo run unbuilt via tsx + the root tsconfig `paths` map; builds are for outside consumers only.
 - **Registrations are effects**: every contribution goes through `ctx.effect()` / `ctx.on()`; a registry's `register()` returns the disposer.
-- **Typed events via declaration merging**; extensible unions use the merge-extensible-map pattern (`ContentBlockMap`, `SessionEventMap`, …). Every new event's JSDoc carries an `@mode` tag and a `@param` per payload parameter (`this`/trailing `next` exempt); every public service-class method documents each parameter and non-void return (`@param`/`@returns`) — the catalog generator hard-errors otherwise ([completeness RFC](docs/rfc/implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.md)); mode semantics are in the [generated events catalog](docs/cordis-catalog/events.md) header and [the catalog RFC](docs/rfc/implemented/process/2026-06-20-generated-cordis-catalog.md).
+- **Typed events via declaration merging**; extensible unions use the merge-extensible-map pattern (`ContentBlockMap`, `SessionEventMap`, …). Every new event's JSDoc carries an `@mode` tag and a `@param` per payload parameter (`this`/trailing `next` exempt); every public service-class method documents each parameter and non-void return (`@param`/`@returns`) — the catalog generator hard-errors otherwise ([completeness RFC](docs/rfc/implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.md)); mode semantics are in the [generated events catalog](docs/cordis-catalog/events.md) header ([catalog RFC](docs/rfc/implemented/process/2026-06-20-generated-cordis-catalog.md)).
 - **Discriminated unions: `switch` on the tag**, not if-chains. Closed unions end with `default: assertNever(...)`; merge-extensible unions must NOT — handle known cases and fall through `default` with a comment.
 - **Waterfall listeners MUST call `next()`** to delegate; returning without it is the veto ([semantics](docs/cordis-primer.md#cordis-waterfall-semantics)).
+- **Model-visible ⟺ logged**: anything that reaches a model request must be reconstructable from the session log; a new model-visible input requires a session event ([reconstructability RFC](docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md)).
 - **Plugins, not loop changes**: new behavior goes on the documented extension seams; changing `agent-loop` requires updating docs/architecture.md.
 - **Capability seams are three packages** — interface / implementation / consumer ([capability seams](docs/rfc/implemented/architecture/2026-06-13-capability-seams.md)); don't split preemptively.
-- **Explicit > implicit at package seams**: no optional field silently filled by a hidden `?? default` inside `run()`; defaulting is an explicit `resolve(request): Spec` step in the owning implementation (the `dsh-bash` request/spec split is the template).
-- **No hardcoded tunables in plugins**: anything two deployments could want different — timeouts, caps, grace periods, model names, base URLs — is a defaulted, validated `Config` field, not a literal; a `DEFAULT_*` constant or test-only seam is not configurability. The test: changeable from `cordis.yml`, no code edit. Protocol/wire constants, external-spec values, security invariants stay hardcoded.
+- **Explicit > implicit at package seams**: defaulting is an explicit `resolve(request): Spec` step in the owning implementation, never a hidden `?? default` inside `run()` (the `dsh-bash` request/spec split is the template).
+- **No hardcoded tunables in plugins**: anything two deployments could want different — timeouts, caps, model names, base URLs — is a defaulted, validated `Config` field, not a literal; a `DEFAULT_*` constant or test-only seam is not configurability. The test: changeable from `cordis.yml`, no code edit. Protocol/wire constants, external-spec values, security invariants stay hardcoded.
 - **Opaque cross-boundary ids are branded** (`Branded<B>` from `dsh-brand`), never bare `string` ([branded IDs](docs/rfc/implemented/architecture/2026-06-20-branded-ids.md)).
 - **An empty `catch` names what it swallows** and why nothing else can reach it; keep the `try` to one statement.
-- **Symmetry is usually more correct**: parallel values get parallel form; asymmetry is a smell for a missed extraction.
+- **Symmetry is usually more correct**: parallel values get parallel form; asymmetry smells of a missed extraction.
 - **Tests document behavior, not golden truth**: a green test pins what the code DOES, not what it SHOULD do. Before preserving a behavior solely for its test, ask whether it is load-bearing; an artifact changes together with its test, with the why in the PR ([worked example](docs/rfc/implemented/simplification/2026-06-19-drop-mutable-session-summary.md)).
 - **RFCs are proposals, not golden truth**: validate its premise against current code before implementing; friction is evidence of over-reach — amend on the way to `implemented/` ([worked example](docs/rfc/implemented/simplification/2026-06-20-public-agent-stop-surface.md)).
 - **Testing policy** — tiers, with-key generosity, real-over-mock, world-verification, real-load-path and published-bin guards: [docs/testing.md](docs/testing.md). A transcript/UX-affecting change needs a snapshot test, or a PR note why none applies.
diff --git a/docs/architecture.md b/docs/architecture.md
index 8caadfbc32..ddbc66c8b5 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeepSeek Harness Architecture
 
-The **DeepSeek Harness SDK** is an SDK for building agent harnesses using the Cordis framework. The governing principle is simple: **everything is a plugin**. For example, the shipped agent loop is just one plugin in the default bundle, not a privileged kernel.
+The **DeepSeek Harness SDK** builds agent harnesses on Cordis. The governing principle is simple: **everything is a plugin**. The shipped agent loop is just one plugin in the default bundle, not a privileged kernel.
 
 Read this page as the system map before changing `packages/`. It explains how the runtime is shaped, how the default loop moves work, where state lives, and where extensions attach. Type shapes live in [core-data-structures/](core-data-structures/core.md); exact event and service signatures live in the generated [events](cordis-catalog/events.md) and [services](cordis-catalog/services.md) catalogs; package contracts live in the [package map](../packages/README.md); rationale lives in the [RFCs](rfc/README.md). If Cordis itself is new to you, start with the [Cordis primer](cordis-primer.md).
 
@@ -42,7 +42,7 @@ Events are the harness extension API. Each service owns the vocabulary for the b
 Use the event domain to decide where new behavior belongs:
 
 - **Session events** are durable, replayable facts. Turn and step boundaries, user input, assistant output, tool calls, tool results, steering, compaction records, and tool-owned durable facts append to the session log and flow through `session/event`.
-- **Agent events** are live runtime surfaces. They carry the live `Agent` handle for status, diagnostics, prompt admission, request mutation, result validation, and continuation policy.
+- **Agent events** are live runtime surfaces. They carry the live `Agent` handle for status, diagnostics, prompt admission, call-config shaping, result validation, and continuation policy.
 - **Capability events** belong to the seam that owns the action. `tools/*`, `llm/*`, `system-prompt/*`, `fs/*`, and `subagent/*` let policy and adapters attach without importing the loop.
 
 ### Interception Semantics
@@ -51,7 +51,7 @@ Waterfall events behave like around-middleware: a listener delegates by calling
 
 ## Default Loop Lifecycle
 
-The shipped loop drains queued work, assembles a request, streams a model answer, executes tools, decides whether to continue, and checkpoints durable state. The important architecture is where it pauses: each pause is a documented service call or event seam that another plugin can program against.
+The shipped loop drains queued work, assembles a request, streams a model answer, executes tools, decides whether to continue, and checkpoints durable state. Its architecture is where it pauses: each pause is a documented service call or event seam another plugin can program against.
 
 A **session** is one agent's append-only event log. A **turn** drains one queued batch and runs until the model stops asking for tools and no plugin requests continuation. A **step** is one model request plus the tool executions caused by that response. In the flow below ([sequence companion](agent-lifecycle.md)), quoted names are durable session events and event names are extension seams.
 
@@ -72,8 +72,8 @@ forever:
       assemble system prompt and tool schemas
       agent/pre-step
       'step/start'
-      derive messages from the session log
-      agent/request -> llm/stream
+      snapshot the derived messages (the reconstruction boundary)
+      agent/request (config only) -> log request/header -> llm/stream (frozen)
         'assistant/chunk'
       agent/step-result
       'assistant/message'
@@ -89,7 +89,7 @@ forever:
     checkpoint persistence and notify idle/running status
 ```
 
-Prompt assembly is single-path: `renderPrompt(assemble({ agent }))` IS the system prompt sent to the model. Plugins contribute ordered sections (static or computed from the per-call `AssembleContext`), tool schemas, and named variables interpolated as `{{name}}` at render — strictly, so an unknown or valueless reference fails the turn instead of shipping a hole. `dsh-system-prompt` itself owns the openers — the static `harness:identity` section (order −100) and the deployment's persona (order 0, from its `persona` config, shared by every agent in the context) — while the shipped loop registers the `model`/`cwd` variables; prompt-fact ownership is pinned by the [prompt-variables RFC](rfc/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.md).
+Prompt assembly is single-path: `renderPrompt(assemble({ agent }))` IS the system prompt sent to the model. Plugins contribute ordered sections (static or computed from the per-call `AssembleContext`), tool schemas, and named variables interpolated as `{{name}}` at render — strictly, so an unknown or valueless reference fails the turn instead of shipping a hole. `dsh-system-prompt` owns the openers — the static `harness:identity` section (order −100) and the deployment's persona (order 0, from its `persona` config, shared by every agent) — while the shipped loop registers the `model`/`cwd` variables; prompt-fact ownership is pinned by the [prompt-variables RFC](rfc/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.md).
 
 Post-tool context lands after all tool results so tool-call/result adjacency stays stable. Steering drains between steps; leftover steering after a turn is re-queued as ordinary input.
 
@@ -109,6 +109,8 @@ Every session event is turn-enclosed. Reloading a crashed session preserves the
 
 The session log is the source of truth. `deriveMessages()` projects session events into the `Message[]` sent to the model; raw `assistant/chunk` events stay in the log for replay and UI fidelity. Replay, fork, resume, transcript rendering, telemetry, and persistence all derive from the same event stream.
 
+**Model-visible ⟺ logged**: the log reconstructs every conversation request byte-for-byte — messages by derivation at the `step/start` boundary, the header (system prompt, tools, model + sampling) by folding `request/header` events — asserted per request by the dev invariant ([reconstructability RFC](rfc/implemented/architecture/2026-07-05-reconstructable-requests.md)).
+
 Durability is a plugin concern. Persistence backends buffer synchronous `session/event` notifications and the loop awaits a turn-end checkpoint before moving on. The `SessionPersistence` seam stores `SessionEvent` directly, with metadata in `SessionHeader`; JSONL and SQLite share one contract suite.
 
 ### Model Content
diff --git a/docs/cookbook/extension-cookbook.md b/docs/cookbook/extension-cookbook.md
index e579d13794..de21ece7b1 100644
--- a/docs/cookbook/extension-cookbook.md
+++ b/docs/cookbook/extension-cookbook.md
@@ -99,10 +99,10 @@ Every product feature maps to a listener on a documented extension seam — the
 | AGENTS.md (root) | a section provider reading the file |
 | AGENTS.md (subdir, on-touch) + file-change notices | `agent.inject()` from a watcher / tool-result listener |
 | Built-in tools | `ctx.tools.register()`; schemas flow into the assembly automatically — the `dsh-tool-*` families (bash, fs, web, subagent, todo) are the shipped examples |
-| ToolSearch / progressive disclosure | wrap `agent/request`, filter `req.tools` |
+| ToolSearch / progressive disclosure | filter tools at `system-prompt/assemble` (the assembly carries the schemas; the loop logs the result as the request header, so disclosure stays reconstructable) |
 | Tool sandbox (landlock / sandbox-exec) | `tools/pre-execute` (deny), or a sandboxing `BashExecutor` on the `dsh-bash` seam |
 | Permission system / AskUserQuestion | `tools/pre-execute` (deny/ask); register an ask tool |
-| Plan mode | `tools/pre-execute` (deny writes) + `agent/request` (inject mode prompt) |
+| Plan mode | `tools/pre-execute` (deny writes) + a mode prompt section via `ctx.systemPrompt.section()` or `agent.inject()` (model-visible ⟺ logged: `agent/request` shapes call config only) |
 | Sub-agent delegation | the `ctx.subagents` provider registry (`dsh-subagent-spawn`/`-fork`/`-acp`) + `dsh-tool-subagent` exposing one configured provider to the model |
 | MCP | one plugin per server: discover tools → `ctx.tools.register()` |
 | Skills | section + tool registration; `inject()` skill content on invocation |
diff --git a/docs/cordis-catalog/events.md b/docs/cordis-catalog/events.md
index d10a7eeabd..753cf8f4d0 100644
--- a/docs/cordis-catalog/events.md
+++ b/docs/cordis-catalog/events.md
@@ -47,7 +47,7 @@ A step or turn errored. The loop reports a failure here (plus the logger) even w
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:394`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:404`](../../packages/core/agent/src/types.ts)
 
 ### `agent/pre-step` — serial
 
@@ -89,15 +89,15 @@ Source: [`packages/core/agent/src/types.ts:273`](../../packages/core/agent/src/t
 
 ### `agent/request` — waterfall
 
-Waterfall: mutate the fully-assembled GenerateOptions before the model call (hooks, model switching, tool filtering, …). Call `next()` to delegate, or return without it to short-circuit. For surface mutation that must precede history derivation (compaction), use agent/pre-step instead — by the time this fires, `options.messages` is already derived.
+Waterfall: shape the step's call configuration — model switching, sampling overrides — by returning a replacement LlmCallConfig (the frozen seed is the config the loop would otherwise use). Config is ALL a listener shapes here: every request is a pure function of the session log (the reconstructability RFC), so model-visible content flows through the log channels — `inject()`, steering, prompt-submit `additionalContext`, prompt sections via `system-prompt/assemble` — never through request mutation, and the loop records whatever config the request actually uses as a `request/header*` event before dispatch. The step's messages are already snapshotted when this fires (the `step/start` boundary): an `inject()` from a listener here lands in the log but joins the NEXT request. For surface mutation that must precede the snapshot (compaction), use agent/pre-step. Call `next()` to delegate, or return an LlmCallConfig without it to short-circuit.
 
 ```ts cordis-catalog
-'agent/request'(agent: Agent, turn: number, step: number, options: GenerateOptions, next: () => Promise<GenerateOptions>): Promise<GenerateOptions>
+'agent/request'(agent: Agent, turn: number, step: number, config: LlmCallConfig, next: () => Promise<LlmCallConfig>): Promise<LlmCallConfig>
 ```
 
-Types: [Agent](../core-data-structures/core.md) · [GenerateOptions](../core-data-structures/core.md)
+Types: [Agent](../core-data-structures/core.md) · [LlmCallConfig](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:359`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:369`](../../packages/core/agent/src/types.ts)
 
 ### `agent/session-start` — emit
 
@@ -133,7 +133,7 @@ Waterfall: post-process the assembled assistant Message before tool dispatch (va
 
 Types: [Agent](../core-data-structures/core.md) · [Message](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:369`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:379`](../../packages/core/agent/src/types.ts)
 
 ### `agent/turn-continuation` — waterfall
 
@@ -145,7 +145,7 @@ Waterfall: override the turn-continuation decision via a typed ContinuationDecis
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:382`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:392`](../../packages/core/agent/src/types.ts)
 
 ## `fs/*`
 
@@ -189,7 +189,7 @@ Source: [`packages/fs/fs/src/index.ts:109`](../../packages/fs/fs/src/index.ts)
 
 ### `llm/stream` — waterfall
 
-Waterfall around every streaming model call (retry, caching, routing). Bound to the LlmService; call `next()` to reach the resolved adapter's stream, or yield your own chunks to short-circuit.
+Waterfall around every streaming model call (retry, replay, routing). Bound to the LlmService; call `next()` to reach the resolved adapter's stream, or yield your own chunks to short-circuit.
 
 ```ts cordis-catalog
 'llm/stream'(this: LlmService, options: GenerateOptions, next: () => AsyncIterable<StreamChunk>): AsyncIterable<StreamChunk>
@@ -197,7 +197,7 @@ Waterfall around every streaming model call (retry, caching, routing). Bound to
 
 Types: [GenerateOptions](../core-data-structures/core.md) · [StreamChunk](../core-data-structures/llm-streaming.md)
 
-Source: [`packages/llm/llm/src/index.ts:33`](../../packages/llm/llm/src/index.ts)
+Source: [`packages/llm/llm/src/index.ts:39`](../../packages/llm/llm/src/index.ts)
 
 ## `session/*`
 
@@ -209,7 +209,7 @@ A session was created in the store.
 'session/created'(session: Session): void
 ```
 
-Source: [`packages/core/session/src/index.ts:36`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:39`](../../packages/core/session/src/index.ts)
 
 ### `session/event` — emit
 
@@ -221,7 +221,7 @@ An event was appended to a session log (sync, fire-and-forget). This is the per-
 
 Types: [SessionEvent](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/index.ts:44`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:47`](../../packages/core/session/src/index.ts)
 
 ### `session/flush` — parallel
 
@@ -231,7 +231,7 @@ Awaited durability checkpoint. The agent loop awaits `ctx.parallel('session/flus
 'session/flush'(session: Session): Promise<void> | void
 ```
 
-Source: [`packages/core/session/src/index.ts:54`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:57`](../../packages/core/session/src/index.ts)
 
 ## `subagent/*`
 
diff --git a/docs/cordis-catalog/services.md b/docs/cordis-catalog/services.md
index 8fff03ba26..9eec6eb105 100644
--- a/docs/cordis-catalog/services.md
+++ b/docs/cordis-catalog/services.md
@@ -79,8 +79,8 @@ Implementations MUST honor:
 - **Blocking**: no compaction begins while another is in progress for the same session. The recommended mechanism is the log-recorded lock — append `compact/start` before the slow work and `compact/end` after (even on failure) — so the lock is visible to replay and crash recovery.
 
 ```ts cordis-catalog
-abstract compactIfNeeded( agent: CompactAgentContext, turn: number, step: number, fullSystemPrompt: string, signal: AbortSignal, ): Promise<CompactionResult | null>
-abstract compactRegion( session: Session, start: number, end: number, agent: CompactAgentContext, turn: number, step: number, signal?: AbortSignal, ): Promise<CompactionResult>
+abstract compactIfNeeded( agent: CompactAgentContext, fullSystemPrompt: string, signal: AbortSignal, ): Promise<CompactionResult | null>
+abstract compactRegion( session: Session, start: number, end: number, agent: CompactAgentContext, signal?: AbortSignal, ): Promise<CompactionResult>
 ```
 
 Source: [`packages/compact/compact/src/index.ts:63`](../../packages/compact/compact/src/index.ts)
@@ -124,7 +124,7 @@ stream(options: GenerateOptions): AsyncIterable<StreamChunk>
 
 Types: [GenerateOptions](../core-data-structures/core.md) · [StreamChunk](../core-data-structures/llm-streaming.md)
 
-Source: [`packages/llm/llm/src/index.ts:78`](../../packages/llm/llm/src/index.ts)
+Source: [`packages/llm/llm/src/index.ts:84`](../../packages/llm/llm/src/index.ts)
 
 ## `ctx.sessionPersistence` — `SessionPersistence` (abstract seam)
 
@@ -163,7 +163,7 @@ get(id: SessionId): Session | undefined
 list(): Session[]
 ```
 
-Source: [`packages/core/session/src/index.ts:327`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:371`](../../packages/core/session/src/index.ts)
 
 ## `ctx.skills` — `SkillService`
 
@@ -176,7 +176,7 @@ async get(name: string, options: SkillLookupOptions = {}): Promise<SkillDefiniti
 async renderModelListing(options: SkillLookupOptions = {}): Promise<string>
 ```
 
-Source: [`packages/core/skill/src/index.ts:133`](../../packages/core/skill/src/index.ts)
+Source: [`packages/core/skill/src/index.ts:134`](../../packages/core/skill/src/index.ts)
 
 ## `ctx.subagents` — `SubagentService`
 
diff --git a/docs/core-data-structures/compaction.md b/docs/core-data-structures/compaction.md
index 05d1ce6c2e..78eb48d38e 100644
--- a/docs/core-data-structures/compaction.md
+++ b/docs/core-data-structures/compaction.md
@@ -11,7 +11,7 @@ Compaction extends [`SessionEventMap`](session.md) with three event types via de
 | Event | Payload | Role |
 |---|---|---|
 | `compact/start` | `{ turn }` | acquires the log-recorded lock |
-| `compact/summary` | `{ summary, shadowedRange, shadowedSeqs, shadowedTokenCount }` | provenance: the summary blocks, the shadowed surface-boundary pair (`start`/`end` seqs — a position span, not a numeric interval), the shadowed seqs in surface order, and the estimated token count |
+| `compact/summary` | `{ summary, shadowedRange, shadowedSeqs, shadowedTokenCount, model, maxTokens? }` | provenance: the summary blocks, the shadowed surface-boundary pair (`start`/`end` seqs — a position span, not a numeric interval), the shadowed seqs in surface order, the estimated token count, and the summarize call's envelope (`model`, plus its generation cap when one applied) — logged so the one-shot request is reconstructable from log + code (the reconstructability RFC) |
 | `compact/end` | `{ turn, error? }` | releases the lock (`error` set when summarization threw) |
 
 The lock brackets the **whole** operation: `compact/start` is appended first, then summarization, the `compact/summary` provenance record, and the `user/message` replacement all land, and only then `compact/end`. Releasing the lock last turns a crash mid-operation into a detectable orphaned lock (a `compact/start` with no matching `compact/end`) rather than a `compact/end` that falsely claims compaction finished.
@@ -50,6 +50,6 @@ interface CompactionResult {
 
 ## The service
 
-`CompactService` (`ctx.compact`, abstract — defined in [`packages/compact/compact/src/index.ts`](../../packages/compact/compact/src/index.ts)) declares two abstract methods: `compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)` checks token pressure and compacts an older range if the history is too large (returning `null` when nothing needs it), and `compactRegion(session, start, end, agent, turn, step, signal?)` forcibly summarizes surface nodes `[start, end]` into a single replacement node. `compactIfNeeded`'s parameters are all required — the loop's `agent/pre-step` checkpoint supplies the agent, lifecycle context, assembled `fullSystemPrompt`, and turn `signal`. A backend summarizing via `ctx.llm.stream()` must forward `signal` into the call's `GenerateOptions.signal`, so an abort or dispose tears down the in-flight summarization. The entire strategy — token estimation, retention policy, event sequencing, summarization — is a HOW decision owned by the implementation.
+`CompactService` (`ctx.compact`, abstract — defined in [`packages/compact/compact/src/index.ts`](../../packages/compact/compact/src/index.ts)) declares two abstract methods: `compactIfNeeded(agent, fullSystemPrompt, signal)` checks token pressure and compacts an older range if the history is too large (returning `null` when nothing needs it), and `compactRegion(session, start, end, agent, signal?)` forcibly summarizes surface nodes `[start, end]` into a single replacement node. `compactIfNeeded`'s parameters are all required — the loop's `agent/pre-step` checkpoint supplies the agent, the assembled `fullSystemPrompt`, and the turn `signal`. A backend summarizing via `ctx.llm.stream()` must forward `signal` into the call's `GenerateOptions.signal`, so an abort or dispose tears down the in-flight summarization. The entire strategy — token estimation, retention policy, event sequencing, summarization — is a HOW decision owned by the implementation.
 
 Auto-compaction runs on the serial `agent/pre-step` loop seam (fired once per step, after `turn/start` and BEFORE the step opens and its request history is derived), not the `agent/request` waterfall: compaction mutates the session surface in place — with its log-only `compact/*` records landing cleanly outside any step — and the loop derives the request from the already-compacted surface. Retention is turn-agnostic — the only structural guard is tool-pairing balance (a compacted region's edges are balanced cuts on the surface, so it never splits a step's tool-calls from their results), so a single runaway turn that alone exceeds the window compacts its own early closed steps rather than being retained verbatim. The backend that ships this (`dsh-compact-basic`) documents the retention walk, summary shrink validation, bounded re-compaction, and the crash/recoverable failure taxonomy.
diff --git a/docs/core-data-structures/core.md b/docs/core-data-structures/core.md
index 6745db1f9b..704cb79797 100644
--- a/docs/core-data-structures/core.md
+++ b/docs/core-data-structures/core.md
@@ -28,6 +28,8 @@ Everything else is documented on a **sub-page**, not here. The rule that draws t
 
 > Type definitions on this page are pasted **verbatim** from source and drift-checked by `pnpm run verify-type-equiv` (see [development.md](../development.md#documenting-types-verbatim-ts-type-equiv)). Inline JSDoc is omitted for readability; follow the source link for the full contracts.
 
+FIXME(catalog-verbs): the drift gate covers only the nouns (the pasted type shapes); every method surface on these pages is hand-written prose. core-data-structures should probably also generate the *verbs* — the public methods of the cataloged classes — so a signature change cannot silently outdate the catalog.
+
 ## The `…Map → derived-union` pattern
 
 Almost every extensible sum type in the harness follows one shape: an interface keyed by a discriminant tag (the `…Map`), from which the union is derived with `keyof`. Plugins add variants by **declaration merging** — no edit to the owning package.
@@ -184,6 +186,21 @@ interface ToolSchema {
 
 The model-facing `ToolSchema` is the wire shape; the registered `ToolDefinition` that produces it (schema + `execute`) is on [tools.md](tools.md).
 
+### The request envelope: `LlmCallConfig` and the logged header
+
+Requests are built by the loop, not shaped per call: the non-content half of a request — the `EpochHeader`: this call configuration plus the rendered system prompt and assembled tool schemas — is logged session state (`request/header` snapshot and delta events, [session.md](session.md#the-request-header-events-requestheader-and-requestheader-delta)), so every conversation request is a pure function of the session log ([reconstructability RFC](../rfc/implemented/architecture/2026-07-05-reconstructable-requests.md)). The `agent/request` waterfall receives a frozen `LlmCallConfig` seed and a listener returns a replacement to switch model or sampling — the loop logs whatever the request actually uses. Loop-built requests arrive at `llm/stream` deep-frozen; mutation throws.
+
+FIXME(call-config-shape): revisit the exact definition of this type — which fields are genuinely epoch-level for cache purposes (`model` certainly; the sampling scalars sit here out of caution), and where provider-specific extras (reasoning options, extra body params) belong when an adapter needs them.
+
+```ts type-equiv
+interface LlmCallConfig {
+  model: string
+  temperature?: number
+  maxTokens?: number
+  stop?: string[]
+}
+```
+
 ## Sessions
 
 A `Session` is an **append-only log** of typed `SessionEvent`s — the single source of truth. The LLM message history is *derived* from the log (`deriveMessages()`), not stored separately. The event vocabulary derives from `SessionEventMap`:
@@ -212,7 +229,7 @@ type SessionEvent<T extends SessionEventType = SessionEventType> = {
 }[T]
 ```
 
-The thirteen event variants (`turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `prompt/blocked`, `context/message`, `assistant/chunk`, `assistant/message`, `tool/call`, `tool/result`, `steering/message`, `todo/write`), the `deriveMessages()` projection rules, the `TurnTrigger`/`TurnEndReason` reasons, and the turn-enclosure invariant are on **[session.md](session.md)**. How the log is made durable — the `SessionPersistence` seam, JSONL/SQLite backends, the `session/flush` checkpoint, crash recovery, and `SessionHeader` — is on **[persistence.md](persistence.md)**.
+The fifteen event variants (`turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `prompt/blocked`, `context/message`, `assistant/chunk`, `assistant/message`, `tool/call`, `tool/result`, `steering/message`, `todo/write`, `request/header`, `request/header-delta`), the `deriveMessages()` projection rules, the `TurnTrigger`/`TurnEndReason` reasons, and the turn-enclosure invariant are on **[session.md](session.md)**. How the log is made durable — the `SessionPersistence` seam, JSONL/SQLite backends, the `session/flush` checkpoint, crash recovery, and `SessionHeader` — is on **[persistence.md](persistence.md)**.
 
 ## The agent handle
 
diff --git a/docs/core-data-structures/session.md b/docs/core-data-structures/session.md
index 92a9d3421f..5ecb1c7044 100644
--- a/docs/core-data-structures/session.md
+++ b/docs/core-data-structures/session.md
@@ -60,6 +60,30 @@ interface SessionEventMap {
    * cordis-catalog row.
    */
   'todo/write': { todos: TodoItem[] }
+  /**
+   * Full snapshot of the {@link EpochHeader} the NEXT request is built under,
+   * with the {@link RequestHeaderReason} it was recorded whole. Appended by
+   * the loop inside the step, before dispatch, on a loop instance's first
+   * request-building step (`'initial'`/`'resume'`) or when a delta failed its
+   * round-trip guard (`'fallback'`); always records what the request actually
+   * used, post-`agent/request`. Anchors the header fold: reconstruction reads
+   * the latest snapshot and applies the deltas after it. NOT a
+   * {@link SurfaceEventType}: it produces no LLM message — it is the request
+   * envelope, logged so every request is a pure function of the session log
+   * (the reconstructability RFC).
+   */
+  'request/header': { header: EpochHeader; reason: RequestHeaderReason }
+  /**
+   * Amendment to the folded {@link EpochHeader}: at least one of a
+   * {@link SystemDelta}, a {@link ToolsDelta}, or a whole replacement
+   * {@link LlmCallConfig} (four scalars — not worth diffing). Appended by the
+   * loop inside the step, before dispatch, when the header for this request
+   * differs from the fold of the log so far; the writer verifies
+   * `applyHeaderDelta(previous, delta)` reproduces the new header exactly and
+   * falls back to a `'fallback'` `request/header` snapshot when it cannot, so
+   * a logged delta ALWAYS round-trips. NOT a {@link SurfaceEventType}.
+   */
+  'request/header-delta': { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig }
 }
 ```
 
@@ -74,6 +98,23 @@ export interface TodoItem {
 }
 ```
 
+### The request header events: `request/header` and `request/header-delta`
+
+The request envelope — the `EpochHeader` (call config + rendered system prompt + assembled tool schemas) — is logged session state, so every conversation request is a pure function of the log (the reconstructability RFC). A `request/header` snapshot (reason `'initial' | 'resume' | 'fallback'`) anchors the fold at conversation birth, process boundaries, and delta-encoding fallbacks; `request/header-delta` events amend it mid-run. `foldRequestHeader(events)` reconstructs the header any request was built under; the writer round-trip-verifies every delta before logging it, so a well-formed log always folds. Neither is a `SurfaceEventType` — they produce no LLM message.
+
+```ts type-equiv
+export interface EpochHeader {
+  /** The conversation's call configuration (model + sampling scalars). */
+  config: LlmCallConfig
+  /** Rendered system prompt text; absent for a system-less request. */
+  system?: string
+  /** Assembled tool schemas; absent for a tool-less request. */
+  tools?: ToolSchema[]
+}
+```
+
+Canonical form: an empty system prompt and an empty tool list are ABSENT fields, matching how requests are built. The delta payloads (`SystemDelta` — a common-prefix/suffix line trim; `ToolsDelta` — name-keyed added/removed/changed) live beside the events in [`packages/core/session/src/types.ts`](../../packages/core/session/src/types.ts).
+
 ## `SessionEvent<T>` — one log entry
 
 A proper discriminated union over `type` (not independent `type`/`data` unions), so `switch (event.type)` narrows `event.data` without casts. `seq` is the monotonic position in the log (`seq = log.length`); `time` is epoch ms.
@@ -148,9 +189,9 @@ export interface SurfaceNode {
 }
 ```
 
-## Derived history: `deriveMessages()`
+## Derived history: `deriveMessages()` and `deriveEventMessage()`
 
-`Session.deriveMessages()` projects the event log into the `Message[]` the model sees. The projection rules:
+`Session.deriveMessages()` projects the event log into the `Message[]` the model sees — cached (each surface node projected once, when first seen; a surface rewrite rebuilds) and frozen (a fresh array per call over shared, deep-frozen messages, so mutating logged history through a projection is unrepresentable). `deriveEventMessage(event)` is the per-node pure function the fold applies — public so external reconstructors and the dev invariant project a log prefix with exactly the same rules and cannot disagree with the cache. The projection rules:
 
 - `user/message` → a user message.
 - `assistant/message` → an assistant message. Raw `assistant/chunk` events are replay/UI data and are **skipped** in derivation (the assembled message is authoritative). An **empty-content** `assistant/message` is also skipped — a max-tokens step cut off with no content still records an `assistant/message` to host its `usage`, but a content-less assistant turn must not enter the provider transcript.
diff --git a/docs/core-data-structures/skills.md b/docs/core-data-structures/skills.md
index 6823deb118..f893803620 100644
--- a/docs/core-data-structures/skills.md
+++ b/docs/core-data-structures/skills.md
@@ -86,6 +86,6 @@ interface Config {
 
 ## Prompt and tool contract
 
-`ctx.skills.renderModelListing()` returns a `## Skills` fragment wrapped in `<available_skills>`. Descriptions and `whenToUse` are whitespace-normalized, length-capped, and XML-escaped before rendering. The listing is appended to the same `GenerateOptions.system` string by the `agent/request` waterfall, after the base system prompt is assembled.
+`ctx.skills.renderModelListing()` returns a `## Skills` fragment wrapped in `<available_skills>`. Descriptions and `whenToUse` are whitespace-normalized, length-capped, and XML-escaped before rendering. The listing is appended as a late `system-prompt/assemble` section for the calling agent, so it remains cwd-sensitive while still flowing through the reconstructable system-prompt path.
 
 The model-facing `skill({ name })` tool validates the kebab-case name, loads the complete definition for the calling agent cwd, rejects unknown or `disableModelInvocation` skills, and returns a `<skill_content name="...">` block with the body plus base-directory and relative-path guidance. The tool result is the only v1 path that exposes full skill instructions to the model.
diff --git a/docs/event-producer-consumer.md b/docs/event-producer-consumer.md
index 398b975e54..b1261d0dba 100644
--- a/docs/event-producer-consumer.md
+++ b/docs/event-producer-consumer.md
@@ -9,27 +9,27 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | --- | --- | --- | --- | --- |
 | `agent/created` | `emit` | [`packages/core/agent/src/types.ts:248`](../packages/core/agent/src/types.ts) | [`agent`](../packages/core/agent) (`emit`) | [`stdio-agent`](../packages/ui/stdio-agent) |
 | `agent/disposed` | `emit` | [`packages/core/agent/src/types.ts:255`](../packages/core/agent/src/types.ts) | [`agent`](../packages/core/agent) (`emit`) | [`stdio-agent`](../packages/ui/stdio-agent) |
-| `agent/error` | `emit` | [`packages/core/agent/src/types.ts:394`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
+| `agent/error` | `emit` | [`packages/core/agent/src/types.ts:404`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
 | `agent/pre-step` | `serial` | [`packages/core/agent/src/types.ts:333`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`compact-basic`](../packages/compact/compact-basic) |
 | `agent/prompt-submit` | `waterfall` | [`packages/core/agent/src/types.ts:346`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
 | `agent/queued` | `emit` | [`packages/core/agent/src/types.ts:273`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
-| `agent/request` | `waterfall` | [`packages/core/agent/src/types.ts:359`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`), [`compact-basic`](../packages/compact/compact-basic) (`waterfall`) | [`skill`](../packages/core/skill) |
+| `agent/request` | `waterfall` | [`packages/core/agent/src/types.ts:369`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | - |
 | `agent/session-start` | `emit` | [`packages/core/agent/src/types.ts:288`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
 | `agent/status` | `emit` | [`packages/core/agent/src/types.ts:264`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`acp`](../packages/ui/acp), [`invariants`](../packages/support/invariants), [`stdio-agent`](../packages/ui/stdio-agent) |
-| `agent/step-result` | `waterfall` | [`packages/core/agent/src/types.ts:369`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | - |
-| `agent/turn-continuation` | `waterfall` | [`packages/core/agent/src/types.ts:382`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
+| `agent/step-result` | `waterfall` | [`packages/core/agent/src/types.ts:379`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | - |
+| `agent/turn-continuation` | `waterfall` | [`packages/core/agent/src/types.ts:392`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
 | `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:123`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
 | `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:138`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`) | [`fs-policy`](../packages/fs/fs-policy) |
 | `fs/write-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:109`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
-| `llm/stream` | `waterfall` | [`packages/llm/llm/src/index.ts:33`](../packages/llm/llm/src/index.ts) | [`llm`](../packages/llm/llm) (`waterfall`) | [`llm-replay`](../packages/support/llm-replay) |
-| `session/created` | `emit` | [`packages/core/session/src/index.ts:36`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`emit`) | [`invariants`](../packages/support/invariants), [`session-persistence`](../packages/session-persistence/session-persistence) |
-| `session/event` | `emit` | [`packages/core/session/src/index.ts:44`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`emit`) | [`acp`](../packages/ui/acp), [`invariants`](../packages/support/invariants), [`session-persistence`](../packages/session-persistence/session-persistence), [`stdio-agent`](../packages/ui/stdio-agent) |
-| `session/flush` | `parallel` | [`packages/core/session/src/index.ts:54`](../packages/core/session/src/index.ts) | [`agent-loop`](../packages/core/agent-loop) (`parallel`) | [`session-persistence`](../packages/session-persistence/session-persistence) |
+| `llm/stream` | `waterfall` | [`packages/llm/llm/src/index.ts:39`](../packages/llm/llm/src/index.ts) | [`llm`](../packages/llm/llm) (`waterfall`) | [`invariants`](../packages/support/invariants), [`llm-replay`](../packages/support/llm-replay) |
+| `session/created` | `emit` | [`packages/core/session/src/index.ts:39`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`emit`) | [`invariants`](../packages/support/invariants), [`session-persistence`](../packages/session-persistence/session-persistence) |
+| `session/event` | `emit` | [`packages/core/session/src/index.ts:47`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`emit`) | [`acp`](../packages/ui/acp), [`invariants`](../packages/support/invariants), [`session-persistence`](../packages/session-persistence/session-persistence), [`stdio-agent`](../packages/ui/stdio-agent) |
+| `session/flush` | `parallel` | [`packages/core/session/src/index.ts:57`](../packages/core/session/src/index.ts) | [`agent-loop`](../packages/core/agent-loop) (`parallel`) | [`session-persistence`](../packages/session-persistence/session-persistence) |
 | `subagent/end` | `emit` | [`packages/subagent/subagent/src/index.ts:98`](../packages/subagent/subagent/src/index.ts) | [`subagent`](../packages/subagent/subagent) (`events.dispatch`) | [`hooks-claude`](../packages/hooks/hooks-claude) |
 | `subagent/provider-added` | `emit` | [`packages/subagent/subagent/src/index.ts:72`](../packages/subagent/subagent/src/index.ts) | [`subagent`](../packages/subagent/subagent) (`emit`) | [`tool-subagent`](../packages/subagent/tool-subagent) |
 | `subagent/provider-removed` | `emit` | [`packages/subagent/subagent/src/index.ts:83`](../packages/subagent/subagent/src/index.ts) | - | [`tool-subagent`](../packages/subagent/tool-subagent) |
 | `subagent/start` | `emit` | [`packages/subagent/subagent/src/index.ts:91`](../packages/subagent/subagent/src/index.ts) | [`subagent`](../packages/subagent/subagent) (`events.dispatch`) | [`hooks-claude`](../packages/hooks/hooks-claude) |
-| `system-prompt/assemble` | `waterfall` | [`packages/core/system-prompt/src/index.ts:38`](../packages/core/system-prompt/src/index.ts) | [`system-prompt`](../packages/core/system-prompt) (`waterfall`) | - |
+| `system-prompt/assemble` | `waterfall` | [`packages/core/system-prompt/src/index.ts:38`](../packages/core/system-prompt/src/index.ts) | [`system-prompt`](../packages/core/system-prompt) (`waterfall`) | [`skill`](../packages/core/skill) |
 | `system-prompt/change` | `emit` | [`packages/core/system-prompt/src/index.ts:44`](../packages/core/system-prompt/src/index.ts) | [`system-prompt`](../packages/core/system-prompt) (`emit`) | - |
 | `tools/change` | `emit` | [`packages/core/tools/src/index.ts:87`](../packages/core/tools/src/index.ts) | [`tools`](../packages/core/tools) (`emit`) | - |
 | `tools/post-execute` | `waterfall` | [`packages/core/tools/src/index.ts:82`](../packages/core/tools/src/index.ts) | [`tools`](../packages/core/tools) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
diff --git a/docs/module-graph.md b/docs/module-graph.md
index b9d211787a..e0e75af5a3 100644
--- a/docs/module-graph.md
+++ b/docs/module-graph.md
@@ -111,6 +111,7 @@ flowchart TD
   pkg_skill --> pkg_agent
   pkg_skill --> pkg_fs
   pkg_skill --> pkg_llm
+  pkg_skill --> pkg_system_prompt
   pkg_tools --> pkg_agent
   pkg_tools --> pkg_llm
   pkg_tools --> pkg_system_prompt
@@ -237,7 +238,7 @@ flowchart TD
 | [`hook-protocol`](../packages/hooks/hook-protocol) | `hooks` | [`bash`](../packages/bash/bash), [`session`](../packages/core/session) |
 | [`session-persistence`](../packages/session-persistence/session-persistence) | `session-persistence` | [`session`](../packages/core/session) |
 | [`llm-replay`](../packages/support/llm-replay) | `support` | [`llm`](../packages/llm/llm), [`session`](../packages/core/session) |
-| [`skill`](../packages/core/skill) | `core` | [`agent`](../packages/core/agent), [`fs`](../packages/fs/fs), [`llm`](../packages/llm/llm) |
+| [`skill`](../packages/core/skill) | `core` | [`agent`](../packages/core/agent), [`fs`](../packages/fs/fs), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt) |
 | [`tools`](../packages/core/tools) | `core` | [`agent`](../packages/core/agent), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt) |
 | [`compact-basic`](../packages/compact/compact-basic) | `compact` | [`agent`](../packages/core/agent), [`compact`](../packages/compact/compact), [`llm`](../packages/llm/llm), [`session`](../packages/core/session) |
 | [`session-persistence-jsonl`](../packages/session-persistence/session-persistence-jsonl) | `session-persistence` | [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence) |
diff --git a/docs/persistence-catalog/log-events.md b/docs/persistence-catalog/log-events.md
index bce865dedd..5d6f23f6a8 100644
--- a/docs/persistence-catalog/log-events.md
+++ b/docs/persistence-catalog/log-events.md
@@ -23,7 +23,7 @@ Raw stream chunk — token-level replay fidelity.
 
 Types: [StreamChunk](../core-data-structures/llm-streaming.md)
 
-Source: [`packages/core/session/src/types.ts:237`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:298`](../../packages/core/session/src/types.ts)
 
 #### `assistant/message` — surface
 
@@ -35,7 +35,7 @@ Assembled assistant message for one step (derived history uses this). Carries th
 
 Types: [ContentBlock](../core-data-structures/core.md) · [TokenUsage](../core-data-structures/llm-streaming.md)
 
-Source: [`packages/core/session/src/types.ts:244`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:305`](../../packages/core/session/src/types.ts)
 
 ### `compact/*`
 
@@ -47,7 +47,7 @@ Marks the end of a compaction — log-only, releases the lock. `error` set if su
 'compact/end': { turn: number; error?: string }
 ```
 
-Source: [`packages/compact/compact/src/types.ts:37`](../../packages/compact/compact/src/types.ts)
+Source: [`packages/compact/compact/src/types.ts:46`](../../packages/compact/compact/src/types.ts)
 
 #### `compact/start` — log-only
 
@@ -64,7 +64,7 @@ Source: [`packages/compact/compact/src/types.ts:23`](../../packages/compact/comp
 Provenance record of a completed summarization — log-only, no surfaceOp. The summary content is in `data.summary`; the actual surface replacement is performed by a subsequent `user/message` event that shadows the compacted range.
 
 ```ts persistence-catalog
-'compact/summary': { summary: ContentBlock[]; shadowedRange: { start: number; end: number }; shadowedSeqs: number[]; shadowedTokenCount: number }
+'compact/summary': { summary: ContentBlock[]; shadowedRange: { start: number; end: number }; shadowedSeqs: number[]; shadowedTokenCount: number; model: string; maxTokens?: number }
 ```
 
 Types: [ContentBlock](../core-data-structures/core.md)
@@ -83,7 +83,7 @@ In-session context injection (file-change notices, subdir AGENTS.md, skill conte
 
 Types: [ContentBlock](../core-data-structures/core.md) · [MessageSource](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:235`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:296`](../../packages/core/session/src/types.ts)
 
 ### `hook/*`
 
@@ -119,7 +119,29 @@ A queued prompt an `agent/prompt-submit` listener VETOED — the durable record
 
 Types: [ContentBlock](../core-data-structures/core.md) · [MessageSource](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:229`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:290`](../../packages/core/session/src/types.ts)
+
+### `request/*`
+
+#### `request/header` — log-only
+
+Full snapshot of the EpochHeader the NEXT request is built under, with the RequestHeaderReason it was recorded whole. Appended by the loop inside the step, before dispatch, on a loop instance's first request-building step (`'initial'`/`'resume'`) or when a delta failed its round-trip guard (`'fallback'`); always records what the request actually used, post-`agent/request`. Anchors the header fold: reconstruction reads the latest snapshot and applies the deltas after it. NOT a SurfaceEventType: it produces no LLM message — it is the request envelope, logged so every request is a pure function of the session log (the reconstructability RFC).
+
+```ts persistence-catalog
+'request/header': { header: EpochHeader; reason: RequestHeaderReason }
+```
+
+Source: [`packages/core/session/src/types.ts:350`](../../packages/core/session/src/types.ts)
+
+#### `request/header-delta` — log-only
+
+Amendment to the folded EpochHeader: at least one of a SystemDelta, a ToolsDelta, or a whole replacement LlmCallConfig (four scalars — not worth diffing). Appended by the loop inside the step, before dispatch, when the header for this request differs from the fold of the log so far; the writer verifies `applyHeaderDelta(previous, delta)` reproduces the new header exactly and falls back to a `'fallback'` `request/header` snapshot when it cannot, so a logged delta ALWAYS round-trips. NOT a SurfaceEventType.
+
+```ts persistence-catalog
+'request/header-delta': { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig }
+```
+
+Source: [`packages/core/session/src/types.ts:361`](../../packages/core/session/src/types.ts)
 
 ### `steering/*`
 
@@ -133,7 +155,7 @@ Steering content injected between steps of a running turn.
 
 Types: [ContentBlock](../core-data-structures/core.md) · [MessageSource](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:262`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:323`](../../packages/core/session/src/types.ts)
 
 ### `step/*`
 
@@ -145,7 +167,7 @@ Closes step `step` of turn `turn`.
 'step/end': { turn: number; step: number }
 ```
 
-Source: [`packages/core/session/src/types.ts:216`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:277`](../../packages/core/session/src/types.ts)
 
 #### `step/start` — log-only
 
@@ -155,7 +177,7 @@ Opens step `step` of turn `turn` — one model call plus the tool executions it
 'step/start': { turn: number; step: number }
 ```
 
-Source: [`packages/core/session/src/types.ts:214`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:275`](../../packages/core/session/src/types.ts)
 
 ### `todo/*`
 
@@ -171,7 +193,7 @@ NOT a SurfaceEventType: it produces no LLM message and never reaches `deriveMess
 
 Types: [TodoItem](../core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:276`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:337`](../../packages/core/session/src/types.ts)
 
 ### `tool/*`
 
@@ -185,7 +207,7 @@ The model requested one tool invocation: `name` with the raw `arguments` JSON st
 
 Types: [CallId](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:250`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:311`](../../packages/core/session/src/types.ts)
 
 #### `tool/result` — surface
 
@@ -197,7 +219,7 @@ A completed tool call's model-facing result, plus an optional tool-private `meta
 
 Types: [CallId](../core-data-structures/core.md) · [ContentBlock](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:260`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:321`](../../packages/core/session/src/types.ts)
 
 ### `turn/*`
 
@@ -211,7 +233,7 @@ Closes turn `turn` with the TurnEndReason that ended it. The loop fires the awai
 
 Types: [TurnEndReason](../core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:212`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:273`](../../packages/core/session/src/types.ts)
 
 #### `turn/start` — log-only
 
@@ -223,7 +245,7 @@ Opens turn `turn`. `trigger` records what started it — a drained message batch
 
 Types: [TurnTrigger](../core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:206`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:267`](../../packages/core/session/src/types.ts)
 
 ### `user/*`
 
@@ -237,4 +259,4 @@ A user-visible prompt (queued message drained at turn start).
 
 Types: [ContentBlock](../core-data-structures/core.md) · [MessageSource](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:218`](../../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:279`](../../packages/core/session/src/types.ts)
diff --git a/docs/rfc/INDEX.md b/docs/rfc/INDEX.md
index 6581b8ded8..5b9bae7443 100644
--- a/docs/rfc/INDEX.md
+++ b/docs/rfc/INDEX.md
@@ -118,6 +118,7 @@ Generated by `pnpm run gen-rfc-index` from the RFC tree — never edit by hand;
 | [Tagged render-intent union for tool-call presentation](implemented/architecture/2026-07-02-tool-render-intent-union.md) | 2026-07-02 |
 | [Add direct directory listing to the filesystem seam](implemented/architecture/2026-07-03-filesystem-directory-listing-seam.md) | 2026-07-03 |
 | [Prompt variables and tool-guidance ownership](implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.md) | 2026-07-05 |
+| [Every LLM request is reconstructable from the session log](implemented/architecture/2026-07-05-reconstructable-requests.md) | 2026-07-05 |
 | [Subagent provider-lifecycle events — `subagent/provider-added` / `subagent/provider-removed`](implemented/architecture/2026-07-05-subagent-provider-lifecycle-events.md) | 2026-07-05 |
 
 ### Process
diff --git a/docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md b/docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md
new file mode 100644
index 0000000000..601e64f70a
--- /dev/null
+++ b/docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md
@@ -0,0 +1,52 @@
+# RFC: Every LLM request is reconstructable from the session log
+
+Status: implemented
+
+## Problem
+
+Two gaps shared one root. First, provider KV caching (DeepSeek context caching) is prefix-based — a request pays full price only for the tokens after the longest stored prefix it matches — yet nothing in the request pipeline stated, checked, or measured prefix stability: every registered [`PromptSection`](../../../../packages/core/system-prompt/src/index.ts) happened to be static, the tool set happened not to change mid-session, no listener happened to rewrite requests. A single time-interpolating section would have silently multiplied context cost, and no test or metric would have moved. Second, and deeper: the session log — the system's single source of truth — could not actually answer *what the model saw*. It recorded every message but never the system prompt, the tool schemas, or even which model; the mutable `agent/request` waterfall handed listeners the whole `GenerateOptions` to rewrite per call; replay equivalence was therefore a property of the plugin population, not of the design.
+
+The reference shape for the happy path is MiniCode's `LLMClient`: a stateful conversation client, appended to — never rebuilt — as the conversation advances, resetting only when the system prompt, tool set, or compaction genuinely changes what the model must see. The design question this RFC answers is how to get that discipline without giving up event-sourcing.
+
+## Decision
+
+### The principle
+
+**Model-visible ⟺ logged.** Anything that reaches a model request must be recorded in the session log. The checkable consequence: **every conversation request the loop sends is a pure function of the session log** — anyone holding the log reconstructs it byte-for-byte. Scope, stated precisely: the guarantee covers the loop-built `GenerateOptions`; provider wire bytes follow from it because both adapters' serialization is a pure per-message function at a pinned code version; direct one-shots (compaction's summarize call) log their envelope scalars (`compact/summary.{model, maxTokens}`) and their input is deterministic code over the logged region — reconstructable from log + code, outside the invariant by the unfrozen-request marker.
+
+Prefix-cache stability is corollary #1, not the headline: an append-only log projected by a per-node pure function yields requests that are append-extensions of their predecessors whenever the header is unchanged — stability is emergent, not managed. Byte-exact audit/replay is corollary #2; resume and fork with *attributable* drift is corollary #3.
+
+### The mechanism
+
+**Messages.** `Session.deriveMessages()` is cached: each surface node is projected exactly once, when first seen, through the public per-node function `deriveEventMessage(event)`; a surface rewrite (a compaction `replace` — `SurfaceManager.replaceGeneration`) rebuilds. Callers get a fresh array per call over shared, deep-frozen messages: mutating logged history through a projection is unrepresentable (it throws), replacing the old clone-per-call isolation. External reconstructors fold the same public function over a log prefix, so no two paths can disagree.
+
+**The header.** The request's non-content half — `EpochHeader`: call config (`LlmCallConfig`: model + sampling scalars), rendered system prompt, assembled tool schemas — is logged session state, in canonical form (empty system/tools ≡ absent). Two log-only, turn-enclosed events in dsh-session carry it: `request/header`, a full snapshot with reason `'initial' | 'resume' | 'fallback'`, and `request/header-delta`, an amendment (`SystemDelta`: a common-prefix/suffix line trim; `ToolsDelta`: name-keyed added/removed/changed; `config`: replaced whole). The pure trio `foldRequestHeader` / `diffHeader` / `applyHeaderDelta` reconstructs; the live session tracks the fold with the same lazy cursor as the message cache. Snapshots anchor the fold where a fold needs anchors — conversation birth and process boundaries — and each loop instance appends one on its first request (`'initial'` when the log has none, `'resume'` otherwise, even when nothing changed: the boundary itself is a recorded fact, and cross-restart drift becomes attributable while an unchanged header resumes byte-identical). Deltas are an encoding optimization with a safety valve, never a correctness dependency: the writer verifies `applyHeaderDelta(prev, delta)` reproduces the new header exactly and records a `'fallback'` snapshot when the encoding cannot express a change (a pure tool reordering), so a well-formed log always folds.
+
+**The loop, transmission-stateless.** Per step: render assembly (every step — value comparison needs no change-signal discipline, and a section that varies per step surfaces as a *logged* header event per step instead of a silent bust) → `agent/pre-step` (compaction's surface mutations land before derivation) → **messages snapshot, then `step/start` appended as the next operation in the same synchronous frame** → seed the call config (first request of the instance: from `AgentOptions`, so explicit options always beat the logged baseline — fork model-overrides and resume reconfiguration stay correct; afterwards: from the folded header) → the `agent/request` waterfall, re-typed `(agent, turn, step, config: LlmCallConfig, next) → LlmCallConfig` — a frozen seed and a returned replacement are ALL a listener shapes; content flows through the log channels (`inject()`, steering, prompt-submit `additionalContext`, sections via `system-prompt/assemble`) — → the header event the request owes the log → build `GenerateOptions` from the snapshot + header, deep-freeze (`deepFreeze` exempts the `AbortSignal`, the one live control channel — freezing one breaks `AbortController.abort()`), dispatch. The loop's only in-process bookkeeping is one boolean: whether this instance has logged its anchoring snapshot.
+
+**The reconstruction boundary is `step/start`, unconditionally.** A step's messages are the derivation over `events[0..stepStartSeq)`. Because the snapshot precedes the `step/start` append in the same synchronous frame, nothing can enter this request past the boundary: an `agent.inject()` from an `agent/request` listener (or any concurrent task, or a `session/event` listener firing on `step/start` itself) lands in the log after the boundary and joins the NEXT request. For waterfall-window appends this matches the prior loop (it also derived before its waterfall); for a synchronous `step/start` listener it is a deliberate change — such a listener could previously reach the current request — and `agent/pre-step` is the sanctioned seam for content that must affect the CURRENT request. A step's header for reconstruction is the fold after its own `request/header*` event (which sits between its `step/start` and first response event) or the fold carried forward.
+
+**Enforcement.** Dev-mode ([dsh-invariants](../../../../packages/support/invariants/src/index.ts)), on `llm/stream`: a frozen request with a live `sessionId` — the loop-built marker; hand-built one-shots are unfrozen and skipped — must carry messages deep-equal to the boundary derivation, rebuilt through a FRESH `Session` over `events[0..stepStartSeq)` so the live cache cannot vouch for itself, and header fields equal to `foldRequestHeader` over the log. There is no divergence allowance and nothing to allow: no seam can put unlogged content into a request. `prepend: true` only defends against the replay adapter's short-circuit (an append-registered listener); two prepended listeners have no defined mutual order in cordis, so correctness rests on the seq-bounded fold, never on listener timing. Measurement stays lean: the with-key e2e ([request-cache.e2e.ts](../../../../packages/core/agent-loop/tests/request-cache.e2e.ts)) proves `usage.cacheReadTokens > 0` on every request after the first against the live API, and per-step usage in the log is the production observable — a header event or compaction shows up as a cache-read collapse on the next step.
+
+### The MiniCode shape: adopted, with the provenance arrow inverted
+
+What survives from `LLMClient`: the conversation is maintained, not rebuilt — one projection per message, ever; requests advance append-only; resets happen only for a system-prompt/tool change, a config change, or compaction, each now a *logged* fact. What is deliberately inverted: MiniCode's client is the source of truth and its event stream derives from client appends (`on_event(MessageAdded)`), which suits an advisory event stream. Here the log is contractual — persistence, crash recovery, fork seeding, transcript rendering, and the snapshot harness all replay it — and it carries strictly more than a message list (turn/step boundaries, raw chunk streams, tool-call pairing, provenance, log-only records), so a message-list client cannot generate it. The arrow therefore points log → client: the conversation state IS the log plus two cached folds inside `Session` (messages, header), and the "client" the loop talks to is the session itself. What the inversion buys over the original: the reconstruction is *checkable* against an independent record on every request — MiniCode's client has nothing to check itself against.
+
+## Alternatives considered
+
+- **Client as source of truth** (literal MiniCode): a second operative truth beside the log — the two drift and nothing notices; see the section above.
+- **A stateful transmission client mirroring the log** (a `PromptPrefix` class holding committed/open message zones with an append/editTail/reset vocabulary, the log pushed into it per event): behaviorally equivalent on the happy path, but it duplicates conversation state outside the session, needs transactional rollback around listener seams, keeps an unlogged content-shaping surface (`editTail`) whose divergence the invariant must specially allow, and still cannot answer "what header did the model see" from the log. Dissolving it into the session's own caches plus logged header events made every one of those problems unrepresentable instead of guarded. (PR #162 is the archaeology of this alternative, three designs deep.)
+- **Per-call request scalars** (a freely mutable config handed to each `agent/request` dispatch): a listener flips the model per call with zero accounting, silently abandoning the provider cache this design exists to protect. Config is per-conversation logged state; the waterfall proposes, the log records.
+- **Detect-and-report** (compare consecutive requests, warn on divergence): catches violations after the fact; a violating request is still constructible and ships. Rejected for interface-level unrepresentability.
+- **Event-driven assembly** (re-render only on change signals): a missed-signal bug class — a tool registered mid-session emits `tools/change`, not `system-prompt/change`, and a third-party provider may emit nothing. Per-step render + value compare is robust with zero signal discipline.
+- **Narrative fields on the header events** (a `reason`/`changed` list on deltas): derivable by diffing consecutive events — one home per fact; snapshots carry a reason because an anchor's cause is NOT derivable from the data.
+
+## Consequences
+
+- A request that is not explained by the log cannot be constructed by accident — not by the loop, not by a listener; mutating a built request throws; every header change is a durable, diffable log event.
+- What still costs full price at the provider is inherent and logged: compaction (its `compact/*` events and replace node), a real prompt/tool change (`request/header-delta`), a config switch (ditto), a process boundary with drift (`'resume'` snapshot differing from its predecessor). The provider's own reasoning-content exclusion is managed server-side.
+- The `step/start`-listener behavior change (above) is the one observable semantics change for plugins; `agent/pre-step` is the current-request seam.
+- Tool-result trimming (planned) needs no new mechanism: a logged single-node surface replace (`start === end`) carrying a trimmed `tool/result` under the same `callId` — compaction-family, replay-correct, cache-bust batched by the same pressure logic.
+- Session logs grow one `request/header` snapshot per conversation (system + tool schemas: the dominant term), plus deltas on real changes — small next to `assistant/chunk` volume; `SESSION_FORMAT_VERSION` stays `0` (pre-release churn is absorbed, backends reject-not-migrate).
+- Snapshot goldens changed once (every transcript gains its header events); the fs-writing fixtures are stored in the normalized authored form with cwd-relative tool arguments, because replay only round-trips cwd-independent argument paths.
+- FIXME(call-config-shape): revisit `LlmCallConfig`'s exact field set — which fields are genuinely epoch-level for cache purposes (`model` certainly; the sampling scalars sit there out of caution), and where provider-specific extras (reasoning options, extra body params) belong when an adapter needs them.
diff --git a/docs/rfc/implemented/feature/2026-07-05-skill-system.md b/docs/rfc/implemented/feature/2026-07-05-skill-system.md
index fa1cf74ddd..5f4a18e5a0 100644
--- a/docs/rfc/implemented/feature/2026-07-05-skill-system.md
+++ b/docs/rfc/implemented/feature/2026-07-05-skill-system.md
@@ -18,7 +18,7 @@ Each skill is either `<name>/SKILL.md` or `<name>.md` with YAML frontmatter. `na
 
 Skill filesystem I/O goes through `ctx.fs` when a filesystem service is loaded: project-root lookup probes `.git` with `resolve` and `stat`, root discovery uses `listDir`, skill reads use `readText`, and system-skill installation uses `writeText`. The Node filesystem remains a fallback for minimal contexts that mount `dsh-skill` without the fs seam. Missing roots and unreadable or malformed skill files degrade to warn-and-skip so one bad local file does not make every agent request fail.
 
-The service injects a request-time `## Skills` fragment through the existing `agent/request` waterfall. It appends to `GenerateOptions.system` instead of changing `systemPrompt.assemble()`, because the available project skills depend on the calling agent's cwd. The fragment contains only stable routing metadata and is sorted by skill name after first-wins collection, so equivalent workspaces produce deterministic prompt text and better prefix-cache reuse. Full skill bodies are never included in the listing.
+The service injects a request-time `## Skills` fragment through the existing `system-prompt/assemble` waterfall. It appends a late section for the calling agent instead of mutating `GenerateOptions.system` in `agent/request`, because request configuration is now reconstructable model/sampling state while model-visible content flows through system prompt assembly. The fragment contains only stable routing metadata and is sorted by skill name after first-wins collection, so equivalent workspaces produce deterministic prompt text and better prefix-cache reuse. Full skill bodies are never included in the listing.
 
 The `skill({ name })` tool loads one full skill for the current agent cwd and returns a `<skill_content name="...">` block with the body plus base-directory guidance. Invalid names, unknown skills, and skills marked `disableModelInvocation` return tool errors. v1 does not additionally inject the loaded body into session context; the tool result is the model-visible disclosure path.
 
@@ -32,7 +32,7 @@ The data structures and prompt/tool contract are documented in [skills.md](../..
 
 **Expose skills only as slash commands.** Rejected for v1 because model-initiated loading is the core capability; slash/ACP command advertisement can layer on later without changing discovery.
 
-**Use a separate system-reminder message.** Rejected for the current loop because `agent/request` already owns the last mutation point before the adapter call and `GenerateOptions.system` is the provider-neutral system prompt surface. A later provider-specific surface can still split this fragment if needed.
+**Use a separate system-reminder message.** Rejected for the current loop because the provider-neutral system prompt surface is assembled through `system-prompt/assemble`. A later provider-specific surface can still split this fragment if needed.
 
 **Recursively discover nested `**/SKILL.md`.** Rejected for v1. Flat files and one-level directory bundles cover the configured roots while keeping duplicate handling and prompt order easy to reason about.
 
diff --git a/docs/rfc/proposed/feature/2026-06-15-optional-code-mode.md b/docs/rfc/proposed/feature/2026-06-15-optional-code-mode.md
index 39c907a1c2..e221618ce1 100644
--- a/docs/rfc/proposed/feature/2026-06-15-optional-code-mode.md
+++ b/docs/rfc/proposed/feature/2026-06-15-optional-code-mode.md
@@ -2,6 +2,8 @@
 
 Status: proposed
 
+> Premise partially stale: this proposal predates [request reconstructability](../../implemented/architecture/2026-07-05-reconstructable-requests.md) — `agent/request` now shapes call config only (no request/content mutation), so the interception points named below need re-mapping onto the log channels and `system-prompt/assemble` before implementation.
+
 ## Problem
 
 Today the agent loop advertises every registered tool to the model as a native JSON-schema function definition. `ToolRegistry` feeds its schemas into `ctx.systemPrompt`, the loop puts them on `GenerateOptions.tools`, and the adapter serializes them to the provider's function-calling wire format. The model then invokes one `tool-call` block per step, the loop dispatches each call through `ctx.tools.execute()` **sequentially** (parallel tool execution is an explicit open TODO in `dsh-tools` and [docs/architecture.md](../../../architecture.md)), and **every** intermediate `tool-result` re-enters the model's context on the next request.
diff --git a/examples/acp-agent/tests/snapshots/cancel/session.jsonl b/examples/acp-agent/tests/snapshots/cancel/session.jsonl
index 6a053c9526..9f7741389b 100644
--- a/examples/acp-agent/tests/snapshots/cancel/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/cancel/session.jsonl
@@ -1,8 +1,9 @@
-{"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Start a long task; this turn will be cancelled mid-stream."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":0,"data":{"turn":1,"step":1}}
-{"type":"assistant/chunk","seq":3,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":4,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"partial"}}}
-{"type":"step/end","seq":5,"time":0,"data":{"turn":1,"step":1}}
-{"type":"turn/end","seq":6,"time":0,"data":{"turn":1,"reason":{"kind":"aborted","reason":"session/cancel"}}}
+{"type":"session","version":0,"id":"ff0aac95-8626-4ead-b686-7801b8f71415","createdAt":1783329007744,"cwd":"/var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-cFOX6B"}
+{"type":"turn/start","seq":0,"time":1783329007746,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":1,"time":1783329007747,"data":{"content":[{"type":"text","text":"Start a long task; this turn will be cancelled mid-stream."}],"source":{"kind":"user"}},"surfaceOp":"append"}
+{"type":"step/start","seq":2,"time":1783329007768,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":3,"time":1783329007768,"data":{"header":{"config":{"model":"deepseek-v4-flash"},"system":"You are an AI agent powered by the DeepSeek Harness SDK.\n\nYou are a coding assistant powered by the deepseek-v4-flash model. Your working\ndirectory is /var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-cFOX6B.\n\nVerify your work by running the code or tests. Keep answers brief and\nfactual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\n## Skills\nAvailable skills are listed below. Load a skill with the `skill` tool before following its instructions; do not infer or follow instructions from a skill body that has not been loaded.\n<available_skills>\n<skill name=\"dsh-plugin-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness Cordis plugins and packages.\n</skill>\n<skill name=\"dsh-skill-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness SKILL.md instructions.\nwhenToUse: Use when writing reusable agent instructions for DeepSeek Harness or adding system/project/user skills.\n</skill>\n</available_skills>","tools":[{"name":"subagent","description":"Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The complete, self-contained task for the subagent. It does not share this conversation's context, so include everything it needs."}},"required":["description","prompt"]}},{"name":"subagent_fork","description":"Delegate a task to a subagent that INHERITS this conversation: a child agent seeded with all completed turns so far (it does not see the current in-flight turn), returning only its final result. Use this when the subtask builds on this conversation's context — a follow-up analysis, a review, a continuation — without consuming this conversation's context for the work itself. You receive only its final answer, not its intermediate steps.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The task for the subagent. It already sees this conversation's completed turns, so build on them freely and state only what is new."}},"required":["description","prompt"]}},{"name":"todo_write","description":"Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).","parameters":{"type":"object","properties":{"todos":{"type":"array","description":"The COMPLETE task list, replacing any previous list.","items":{"type":"object","properties":{"content":{"type":"string","description":"What the task is — a short imperative line."},"status":{"type":"string","description":"pending (not started) | in_progress (now) | completed (done).","enum":["pending","in_progress","completed"]}},"required":["content","status"]}}},"required":["todos"]}},{"name":"read","description":"Read a UTF-8 text file and return line-numbered content.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to read, resolved by the filesystem backend."},"offset":{"type":"number","description":"1-based first line to return. Defaults to 1."},"limit":{"type":"number","description":"Maximum number of lines to return. Defaults to 2000."}},"required":["file_path"]}},{"name":"write","description":"Create or fully replace a UTF-8 text file.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to write, resolved by the filesystem backend."},"content":{"type":"string","description":"Full UTF-8 text content to write."}},"required":["file_path","content"]}},{"name":"edit","description":"Edit an existing UTF-8 text file by replacing literal text.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to edit, resolved by the filesystem backend."},"old_string":{"type":"string","description":"Literal text to replace. Must match exactly."},"new_string":{"type":"string","description":"Literal replacement text. Use an empty string to delete the match."},"replace_all":{"type":"boolean","description":"Replace all matches. 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+{"type":"assistant/chunk","seq":5,"time":1783329007768,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"partial"}}}
+{"type":"step/end","seq":6,"time":1783329007769,"data":{"turn":1,"step":1}}
+{"type":"turn/end","seq":7,"time":1783329007769,"data":{"turn":1,"reason":{"kind":"aborted","reason":"session/cancel"}}}
diff --git a/examples/acp-agent/tests/snapshots/error-finish/session.jsonl b/examples/acp-agent/tests/snapshots/error-finish/session.jsonl
index 6f2ca5aa2a..458647f6e3 100644
--- a/examples/acp-agent/tests/snapshots/error-finish/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/error-finish/session.jsonl
@@ -1,6 +1,7 @@
-{"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}"}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"This prompt triggers a recorded provider error."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":0,"data":{"turn":1,"step":1}}
-{"type":"step/end","seq":3,"time":0,"data":{"turn":1,"step":1}}
-{"type":"turn/end","seq":4,"time":0,"data":{"turn":1,"reason":{"kind":"error","step":1,"message":"simulated provider error (HTTP 401)","code":"AUTH"}}}
+{"type":"session","version":0,"id":"fe9808ef-c08c-47bc-96b1-083f0cd2efa0","createdAt":1783329007385,"cwd":"/var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-qcodOr"}
+{"type":"turn/start","seq":0,"time":1783329007387,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":1,"time":1783329007388,"data":{"content":[{"type":"text","text":"This prompt triggers a recorded provider error."}],"source":{"kind":"user"}},"surfaceOp":"append"}
+{"type":"step/start","seq":2,"time":1783329007407,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":3,"time":1783329007407,"data":{"header":{"config":{"model":"deepseek-v4-flash"},"system":"You are an AI agent powered by the DeepSeek Harness SDK.\n\nYou are a coding assistant powered by the deepseek-v4-flash model. Your working\ndirectory is /var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-qcodOr.\n\nVerify your work by running the code or tests. Keep answers brief and\nfactual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. 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Load a skill with the `skill` tool before following its instructions; do not infer or follow instructions from a skill body that has not been loaded.\n<available_skills>\n<skill name=\"dsh-plugin-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness Cordis plugins and packages.\n</skill>\n<skill name=\"dsh-skill-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness SKILL.md instructions.\nwhenToUse: Use when writing reusable agent instructions for DeepSeek Harness or adding system/project/user skills.\n</skill>\n</available_skills>","tools":[{"name":"subagent","description":"Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. 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Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. 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Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"npm install\" → \"Install package dependencies\"."},"timeoutMs":{"type":"number","description":"Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."},"workdir":{"type":"string","description":"Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."},"run_in_background":{"type":"boolean","description":"Run in the background and return a task id immediately. No timeout applies."}},"required":["command","description"]}},{"name":"bash_output","description":"Read new output from a background bash task started with `bash` + `run_in_background`. Returns only output produced since the previous bash_output call, plus the task status. 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+{"type":"turn/end","seq":5,"time":1783329007407,"data":{"turn":1,"reason":{"kind":"error","step":1,"message":"simulated provider error (HTTP 401)","code":"AUTH"}}}
diff --git a/examples/acp-agent/tests/snapshots/fs-edit/session.jsonl b/examples/acp-agent/tests/snapshots/fs-edit/session.jsonl
index d491e4cf0f..b0524cf699 100644
--- a/examples/acp-agent/tests/snapshots/fs-edit/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-edit/session.jsonl
@@ -1,131 +1,134 @@
-{"type":"session","version":0,"id":"554ed85e-1fa3-4791-b4a2-9256b53f8add","createdAt":1783069537397,"cwd":"/tmp/acp-snap-cwd-qAWDep"}
-{"type":"turn/start","seq":0,"time":1783069537400,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1783069537400,"data":{"content":[{"type":"text","text":"First use the read tool to read config.txt in the current directory. Then use the edit tool (NOT bash) to replace the literal text DEBUG with RELEASE in that file. Then reply with exactly the single word DONE."}],"source":{"kind":"user"}},"surfaceOp":"append"}
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+{"type":"assistant/chunk","seq":258,"time":1783329006746,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The bash command succeeded. Let me verify by quickly checking."}}}}
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diff --git a/examples/acp-agent/tests/snapshots/fs-policy-reject/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/fs-policy-reject/stdout.golden.jsonl
index 5d37216325..826dbf5eaa 100644
--- a/examples/acp-agent/tests/snapshots/fs-policy-reject/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-policy-reject/stdout.golden.jsonl
@@ -32,8 +32,8 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_vCcG7c6T2vNO29dXgpkK5485","title":"Edit settings.txt","kind":"edit","status":"in_progress","locations":[{"path":"settings.txt"}],"content":[{"type":"diff","path":"settings.txt","oldText":"blue","newText":"green"}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_vCcG7c6T2vNO29dXgpkK5485","status":"failed","content":[{"type":"content","content":{"type":"text","text":"Error: edit requires reading \"{{cwd}}/settings.txt\" first"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_wR5bVVioXaKocZcba0lm8456","title":"Edit settings.txt","kind":"edit","status":"in_progress","locations":[{"path":"settings.txt"}],"content":[{"type":"diff","path":"settings.txt","oldText":"blue","newText":"green"}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_wR5bVVioXaKocZcba0lm8456","status":"failed","content":[{"type":"content","content":{"type":"text","text":"Error: edit requires reading \"{{cwd}}/settings.txt\" first"}}]}}}
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@@ -45,277 +45,127 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" But"}}}}
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diff --git a/examples/acp-agent/tests/snapshots/fs-read-window/session.jsonl b/examples/acp-agent/tests/snapshots/fs-read-window/session.jsonl
index bad62dda0f..dc7410e623 100644
--- a/examples/acp-agent/tests/snapshots/fs-read-window/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-read-window/session.jsonl
@@ -1,126 +1,115 @@
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diff --git a/examples/acp-agent/tests/snapshots/fs-read-window/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/fs-read-window/stdout.golden.jsonl
index f24c053d50..06b0c40d2d 100644
--- a/examples/acp-agent/tests/snapshots/fs-read-window/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-read-window/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/fs-read/session.jsonl b/examples/acp-agent/tests/snapshots/fs-read/session.jsonl
index 2a8d2d2640..618dba13f5 100644
--- a/examples/acp-agent/tests/snapshots/fs-read/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-read/session.jsonl
@@ -1,87 +1,86 @@
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diff --git a/examples/acp-agent/tests/snapshots/fs-terminal-card/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/fs-terminal-card/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/fs-write-overwrite/session.jsonl b/examples/acp-agent/tests/snapshots/fs-write-overwrite/session.jsonl
index 8ad253a949..cd703267c9 100644
--- a/examples/acp-agent/tests/snapshots/fs-write-overwrite/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-write-overwrite/session.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/fs-write/session.jsonl b/examples/acp-agent/tests/snapshots/fs-write/session.jsonl
index ff637f94a1..592c075d1e 100644
--- a/examples/acp-agent/tests/snapshots/fs-write/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-write/session.jsonl
@@ -1,96 +1,112 @@
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diff --git a/examples/acp-agent/tests/snapshots/fs-write/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/fs-write/stdout.golden.jsonl
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--- a/examples/acp-agent/tests/snapshots/fs-write/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/fs-write/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/session.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/session.jsonl
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+{"type":"assistant/chunk","seq":646,"time":1783329012241,"data":{"turn":1,"step":7,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The bash tool keeps rejecting my output regardless of what I try. The error message is \"tool output rejected by policy: rerun with a summary instead\". This means the output can't be shown and I need to summarize what happened instead of showing the raw output.\n\nThe user asked me to \"Report the tool result you got back verbatim, then stop.\" But the policy prevents me from showing the raw tool result. I should inform the user about what happened."}}}}
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/stdout.golden.jsonl
index ef5692d574..31b852855c 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-posttool-block/stdout.golden.jsonl
@@ -6,8 +6,7 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" command"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
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@@ -25,8 +24,8 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_e9zAlNQhIVFKzoStUuWI7161","title":"echo HELLO","kind":"execute","status":"in_progress","rawInput":"echo HELLO","content":[{"type":"content","content":{"type":"text","text":"Run echo HELLO"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_e9zAlNQhIVFKzoStUuWI7161","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\ntool output rejected by policy: rerun with a summary instead\n```"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_DTsrFFSO2quJaSI4cloc6172","title":"echo HELLO","kind":"execute","status":"in_progress","rawInput":"echo HELLO","content":[{"type":"content","content":{"type":"text","text":"Run echo HELLO"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_DTsrFFSO2quJaSI4cloc6172","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\ntool output rejected by policy: rerun with a summary instead\n```"}}]}}}
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@@ -35,197 +34,361 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" rer"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" error"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" says"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"`"}}}}
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@@ -238,42 +401,31 @@
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/session.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/session.jsonl
index 053ce1c251..e7d88ac0cf 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/session.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/stdout.golden.jsonl
index 2497acffa0..39e299e2ac 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-posttool-context/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/session.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/session.jsonl
index b0e7a5f00f..aea3f3dd89 100644
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/stdout.golden.jsonl
index 60aaee5aa5..5154fb0054 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/stdout.golden.jsonl
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+{"type":"assistant/chunk","seq":78,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"The"}}}
+{"type":"assistant/chunk","seq":79,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" bash"}}}
+{"type":"assistant/chunk","seq":80,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" tool"}}}
+{"type":"assistant/chunk","seq":81,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" is"}}}
+{"type":"assistant/chunk","seq":82,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" disabled"}}}
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+{"type":"assistant/chunk","seq":84,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" policy"}}}
+{"type":"assistant/chunk","seq":85,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" in"}}}
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+{"type":"assistant/chunk","seq":87,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" session"}}}
+{"type":"assistant/chunk","seq":88,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"."}}}
+{"type":"assistant/chunk","seq":89,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" The"}}}
+{"type":"assistant/chunk","seq":90,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" tool"}}}
+{"type":"assistant/chunk","seq":91,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" result"}}}
+{"type":"assistant/chunk","seq":92,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" I"}}}
+{"type":"assistant/chunk","seq":93,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" received"}}}
+{"type":"assistant/chunk","seq":94,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" is"}}}
+{"type":"assistant/chunk","seq":95,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":":\n\n"}}}
+{"type":"assistant/chunk","seq":96,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":">"}}}
+{"type":"assistant/chunk","seq":97,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" Error"}}}
+{"type":"assistant/chunk","seq":98,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":":"}}}
+{"type":"assistant/chunk","seq":99,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" bash"}}}
+{"type":"assistant/chunk","seq":100,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" is"}}}
+{"type":"assistant/chunk","seq":101,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" disabled"}}}
+{"type":"assistant/chunk","seq":102,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" by"}}}
+{"type":"assistant/chunk","seq":103,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" policy"}}}
+{"type":"assistant/chunk","seq":104,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" in"}}}
+{"type":"assistant/chunk","seq":105,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" this"}}}
+{"type":"assistant/chunk","seq":106,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":" session"}}}
+{"type":"assistant/chunk","seq":107,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The bash tool is disabled by policy. I need to report this error verbatim."}}}}
+{"type":"assistant/chunk","seq":108,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"The bash tool is disabled by policy in this session. The tool result I received is:\n\n> Error: bash is disabled by policy in this session"}}}}
+{"type":"assistant/chunk","seq":109,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":163,"outputTokens":47,"cacheReadTokens":2048,"reasoningTokens":17}}}}
+{"type":"assistant/chunk","seq":110,"time":1783329010777,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":111,"time":1783329010777,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The bash tool is disabled by policy. I need to report this error verbatim."},{"type":"text","text":"The bash tool is disabled by policy in this session. The tool result I received is:\n\n> Error: bash is disabled by policy in this session"}],"usage":{"inputTokens":163,"outputTokens":47,"cacheReadTokens":2048,"reasoningTokens":17}},"sourceEventSeqs":[59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110],"surfaceOp":"append"}
+{"type":"step/end","seq":112,"time":1783329010777,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":113,"time":1783329010778,"data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/examples/acp-agent/tests/snapshots/hook-cc-pretool-deny/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-pretool-deny/stdout.golden.jsonl
index 847d79a85c..417debf565 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-pretool-deny/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-pretool-deny/stdout.golden.jsonl
@@ -6,16 +6,10 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" run"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" `"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"echo"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" HE"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"LL"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"O"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"`"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" using"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" a"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" specific"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" bash"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" tool"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" command"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" report"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
@@ -23,8 +17,8 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" verb"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"atim"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_NQfQgkyjofpjsaiEUcsX0103","title":"echo HELLO","kind":"execute","status":"in_progress","rawInput":"echo HELLO","content":[{"type":"content","content":{"type":"text","text":"Run echo HELLO"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_NQfQgkyjofpjsaiEUcsX0103","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\nError: bash is disabled by policy in this session\n```"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_2jt6XMevnQ5xS78a6Rhg8821","title":"echo HELLO","kind":"execute","status":"in_progress","rawInput":"echo HELLO","content":[{"type":"content","content":{"type":"text","text":"Run echo HELLO"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_2jt6XMevnQ5xS78a6Rhg8821","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\nError: bash is disabled by policy in this session\n```"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" bash"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" tool"}}}}
@@ -32,28 +26,36 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" disabled"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" by"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" policy"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" in"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" this"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" session"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" report"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" this"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" result"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" error"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" verb"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"atim"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" user"}}}}
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 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" bash"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" tool"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" returned"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" is"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" disabled"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" by"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" policy"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" in"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" this"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" session"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" tool"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" result"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" I"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" received"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" is"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":":\n\n"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"```\n"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"Error"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":">"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" Error"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":":"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" bash"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" is"}}}}
@@ -63,28 +65,4 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" in"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" this"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" session"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"\n"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"```\n\n"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"That"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" is"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" verb"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"atim"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" result"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" I"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" cannot"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" proceed"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" further"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" because"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" bash"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" tool"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" is"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" not"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" available"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" in"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" this"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" session"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","id":3,"result":{"stopReason":"end_turn"}}
diff --git a/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-block/session.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-block/session.jsonl
index b5f81fdaea..5bec59c2ca 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-block/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-block/session.jsonl
@@ -1,6 +1,6 @@
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-context/session.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-context/session.jsonl
index 33cf2c8ba0..f78771476f 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-context/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-context/session.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.golden.jsonl
index a33b67ee1a..ce5946ef09 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.golden.jsonl
@@ -15,42 +15,20 @@
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-posttool-block/session.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-posttool-block/session.jsonl
index ff774c4643..1205bca5fd 100644
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+{"type":"assistant/message","seq":142,"time":1783329014530,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The tool output was rejected by codex policy, but I'm told to report the tool result verbatim. The result I got back is: \"tool output rejected by codex policy: summarize instead\". I'll report this verbatim."},{"type":"text","text":"The tool result I got back verbatim is:\n\n```\ntool output rejected by codex policy: summarize instead\n```"}],"usage":{"inputTokens":168,"outputTokens":72,"cacheReadTokens":2048,"reasoningTokens":48}},"sourceEventSeqs":[65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141],"surfaceOp":"append"}
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-posttool-block/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-posttool-block/stdout.golden.jsonl
index bc189b2cc2..337e8bc90f 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-posttool-block/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-posttool-block/stdout.golden.jsonl
@@ -6,12 +6,12 @@
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 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" run"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" `"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"echo"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" HE"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"LL"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"O"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"`"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" using"}}}}
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 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" bash"}}}}
@@ -23,9 +23,10 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_NN9uJWZQDPiUfGC6VAtF0696","title":"echo HELLO","kind":"execute","status":"in_progress","rawInput":"echo HELLO","content":[{"type":"content","content":{"type":"text","text":"Run echo HELLO"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_NN9uJWZQDPiUfGC6VAtF0696","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\ntool output rejected by codex policy: summarize instead\n```"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_UEEuJUrlwD7IyoZJkLAp1248","title":"echo HELLO","kind":"execute","status":"in_progress","rawInput":"echo HELLO","content":[{"type":"content","content":{"type":"text","text":"Run echo HELLO"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_UEEuJUrlwD7IyoZJkLAp1248","status":"failed","content":[{"type":"content","content":{"type":"text","text":"```console\ntool output rejected by codex policy: summarize instead\n```"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" tool"}}}}
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@@ -33,265 +34,66 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Let"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" try"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" again"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exact"}}}}
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/session.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/session.jsonl
index 1a93694456..f7155e9f20 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/session.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/stdout.golden.jsonl
index 1639d59448..9514362461 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-posttool-context/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/session.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/session.jsonl
index 0e6d3ac407..d00c24f3c2 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/session.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/stdout.golden.jsonl
index f9f8fc7982..7b72951cea 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-pretool-block/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-block/session.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-block/session.jsonl
index bc9144f980..a87b44aad4 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-block/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-block/session.jsonl
@@ -1,6 +1,6 @@
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-context/session.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-context/session.jsonl
index 2e37a148e9..87ceca6e33 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-context/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-context/session.jsonl
@@ -1,52 +1,49 @@
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+{"type":"assistant/chunk","seq":65,"time":1783329015417,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user is asking me to reply with the single word \"SECOND\" and then stop."}}}}
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+{"type":"assistant/chunk","seq":68,"time":1783329015417,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":69,"time":1783329015417,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The user is asking me to reply with the single word \"SECOND\" and then stop."},{"type":"text","text":"SECOND"}],"usage":{"inputTokens":68,"outputTokens":22,"cacheReadTokens":2048,"reasoningTokens":19}},"sourceEventSeqs":[42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68],"surfaceOp":"append"}
+{"type":"step/end","seq":70,"time":1783329015417,"data":{"turn":1,"step":2}}
+{"type":"hook/invoked","seq":71,"time":1783329015418,"data":{"turn":1,"point":"Stop","dialect":"codex","handlerId":"codex:Stop:2"}}
+{"type":"hook/result","seq":72,"time":1783329015469,"data":{"turn":1,"point":"Stop","handlerId":"codex:Stop:2","decision":"pass","exitCode":0,"durationMs":51.29208299999999}}
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.golden.jsonl
index 674613a8b9..4134ed0d89 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.golden.jsonl
@@ -2,7 +2,8 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" wants"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" asking"}}}}
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 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
@@ -17,11 +18,18 @@
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" That"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" asking"}}}}
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@@ -30,194 +38,13 @@
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diff --git a/examples/acp-agent/tests/snapshots/multi-turn/session.jsonl b/examples/acp-agent/tests/snapshots/multi-turn/session.jsonl
index 4d90f86be5..bc49b0b579 100644
--- a/examples/acp-agent/tests/snapshots/multi-turn/session.jsonl
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Load a skill with the `skill` tool before following its instructions; do not infer or follow instructions from a skill body that has not been loaded.\n<available_skills>\n<skill name=\"dsh-plugin-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness Cordis plugins and packages.\n</skill>\n<skill name=\"dsh-skill-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness SKILL.md instructions.\nwhenToUse: Use when writing reusable agent instructions for DeepSeek Harness or adding system/project/user skills.\n</skill>\n</available_skills>","tools":[{"name":"subagent","description":"Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. 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You receive only its final answer, not its intermediate steps.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The task for the subagent. It already sees this conversation's completed turns, so build on them freely and state only what is new."}},"required":["description","prompt"]}},{"name":"todo_write","description":"Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).","parameters":{"type":"object","properties":{"todos":{"type":"array","description":"The COMPLETE task list, replacing any previous list.","items":{"type":"object","properties":{"content":{"type":"string","description":"What the task is — a short imperative line."},"status":{"type":"string","description":"pending (not started) | in_progress (now) | completed (done).","enum":["pending","in_progress","completed"]}},"required":["content","status"]}}},"required":["todos"]}},{"name":"read","description":"Read a UTF-8 text file and return line-numbered content.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to read, resolved by the filesystem backend."},"offset":{"type":"number","description":"1-based first line to return. Defaults to 1."},"limit":{"type":"number","description":"Maximum number of lines to return. Defaults to 2000."}},"required":["file_path"]}},{"name":"write","description":"Create or fully replace a UTF-8 text file.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to write, resolved by the filesystem backend."},"content":{"type":"string","description":"Full UTF-8 text content to write."}},"required":["file_path","content"]}},{"name":"edit","description":"Edit an existing UTF-8 text file by replacing literal text.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to edit, resolved by the filesystem backend."},"old_string":{"type":"string","description":"Literal text to replace. Must match exactly."},"new_string":{"type":"string","description":"Literal replacement text. Use an empty string to delete the match."},"replace_all":{"type":"boolean","description":"Replace all matches. Defaults to false; when false, old_string must appear exactly once."}},"required":["file_path","old_string","new_string"]}},{"name":"bash","description":"Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; poll it with `bash_output` and stop it with `bash_kill`.","parameters":{"type":"object","properties":{"command":{"type":"string","description":"The bash command to execute."},"description":{"type":"string","description":"Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"npm install\" → \"Install package dependencies\"."},"timeoutMs":{"type":"number","description":"Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."},"workdir":{"type":"string","description":"Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."},"run_in_background":{"type":"boolean","description":"Run in the background and return a task id immediately. No timeout applies."}},"required":["command","description"]}},{"name":"bash_output","description":"Read new output from a background bash task started with `bash` + `run_in_background`. Returns only output produced since the previous bash_output call, plus the task status. Tasks keep running while you do other work; poll again later for more output.","parameters":{"type":"object","properties":{"task_id":{"type":"string","description":"Task id returned by the bash tool."}},"required":["task_id"]}},{"name":"bash_kill","description":"Ask the executor to kill a running background bash task by task id.","parameters":{"type":"object","properties":{"task_id":{"type":"string","description":"Task id returned by the bash tool."}},"required":["task_id"]}},{"name":"skill","description":"Load the full instructions for one available skill by name. Use this when the current task matches a skill listed in the system prompt.","parameters":{"type":"object","properties":{"name":{"type":"string","description":"The exact skill name from the available skills list."}},"required":["name"]}}]},"reason":"initial"}}
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diff --git a/examples/acp-agent/tests/snapshots/multi-turn/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/multi-turn/stdout.golden.jsonl
index 22bb6757fd..034640517d 100644
--- a/examples/acp-agent/tests/snapshots/multi-turn/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/multi-turn/stdout.golden.jsonl
@@ -14,7 +14,6 @@
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diff --git a/examples/acp-agent/tests/snapshots/skill-load/session.jsonl b/examples/acp-agent/tests/snapshots/skill-load/session.jsonl
index 655b9568fc..bb5d744bd2 100644
--- a/examples/acp-agent/tests/snapshots/skill-load/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/skill-load/session.jsonl
@@ -1,28 +1,29 @@
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+{"type":"request/header","seq":3,"time":1783329004168,"data":{"header":{"config":{"model":"deepseek-v4-flash"},"system":"You are an AI agent powered by the DeepSeek Harness SDK.\n\nYou are a coding assistant powered by the deepseek-v4-flash model. Your working\ndirectory is /var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-g1SZ2i.\n\nVerify your work by running the code or tests. Keep answers brief and\nfactual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\n## Skills\nAvailable skills are listed below. Load a skill with the `skill` tool before following its instructions; do not infer or follow instructions from a skill body that has not been loaded.\n<available_skills>\n<skill name=\"dsh-plugin-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness Cordis plugins and packages.\n</skill>\n<skill name=\"dsh-skill-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness SKILL.md instructions.\nwhenToUse: Use when writing reusable agent instructions for DeepSeek Harness or adding system/project/user skills.\n</skill>\n</available_skills>","tools":[{"name":"subagent","description":"Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The complete, self-contained task for the subagent. It does not share this conversation's context, so include everything it needs."}},"required":["description","prompt"]}},{"name":"subagent_fork","description":"Delegate a task to a subagent that INHERITS this conversation: a child agent seeded with all completed turns so far (it does not see the current in-flight turn), returning only its final result. Use this when the subtask builds on this conversation's context — a follow-up analysis, a review, a continuation — without consuming this conversation's context for the work itself. You receive only its final answer, not its intermediate steps.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The task for the subagent. It already sees this conversation's completed turns, so build on them freely and state only what is new."}},"required":["description","prompt"]}},{"name":"todo_write","description":"Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).","parameters":{"type":"object","properties":{"todos":{"type":"array","description":"The COMPLETE task list, replacing any previous list.","items":{"type":"object","properties":{"content":{"type":"string","description":"What the task is — a short imperative line."},"status":{"type":"string","description":"pending (not started) | in_progress (now) | completed (done).","enum":["pending","in_progress","completed"]}},"required":["content","status"]}}},"required":["todos"]}},{"name":"read","description":"Read a UTF-8 text file and return line-numbered content.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to read, resolved by the filesystem backend."},"offset":{"type":"number","description":"1-based first line to return. Defaults to 1."},"limit":{"type":"number","description":"Maximum number of lines to return. Defaults to 2000."}},"required":["file_path"]}},{"name":"write","description":"Create or fully replace a UTF-8 text file.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to write, resolved by the filesystem backend."},"content":{"type":"string","description":"Full UTF-8 text content to write."}},"required":["file_path","content"]}},{"name":"edit","description":"Edit an existing UTF-8 text file by replacing literal text.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to edit, resolved by the filesystem backend."},"old_string":{"type":"string","description":"Literal text to replace. Must match exactly."},"new_string":{"type":"string","description":"Literal replacement text. Use an empty string to delete the match."},"replace_all":{"type":"boolean","description":"Replace all matches. Defaults to false; when false, old_string must appear exactly once."}},"required":["file_path","old_string","new_string"]}},{"name":"bash","description":"Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; poll it with `bash_output` and stop it with `bash_kill`.","parameters":{"type":"object","properties":{"command":{"type":"string","description":"The bash command to execute."},"description":{"type":"string","description":"Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"npm install\" → \"Install package dependencies\"."},"timeoutMs":{"type":"number","description":"Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."},"workdir":{"type":"string","description":"Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."},"run_in_background":{"type":"boolean","description":"Run in the background and return a task id immediately. No timeout applies."}},"required":["command","description"]}},{"name":"bash_output","description":"Read new output from a background bash task started with `bash` + `run_in_background`. Returns only output produced since the previous bash_output call, plus the task status. 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diff --git a/examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl b/examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl
index 8bc3d394ad..1b4c2e8d90 100644
--- a/examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl
@@ -1,89 +1,77 @@
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-{"type":"turn/start","seq":0,"time":1782133842298,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1782133842298,"data":{"content":[{"type":"text","text":"Remember this fact for later: the project codeword is MARMALADE. Reply with the single word OK and stop. Do not use any tools."}],"source":{"kind":"user"}},"surfaceOp":"append"}
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diff --git a/examples/acp-agent/tests/snapshots/subagent-fork/session.jsonl b/examples/acp-agent/tests/snapshots/subagent-fork/session.jsonl
index 358c71f6b0..d3e32d9807 100644
--- a/examples/acp-agent/tests/snapshots/subagent-fork/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-fork/session.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/subagent-fork/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/subagent-fork/stdout.golden.jsonl
index f14353a7ea..648a7bfa38 100644
--- a/examples/acp-agent/tests/snapshots/subagent-fork/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-fork/stdout.golden.jsonl
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" turns"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" of"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" this"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" conversation"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" which"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" includes"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" fact"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" that"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" project"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" cod"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ew"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ord"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"M"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ARM"}}}}
@@ -77,24 +80,21 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Let"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" do"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" that"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" this"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_gnZDhmbVLP9hQ0PT42QW7314","title":"subagent_fork","kind":"other","status":"in_progress","rawInput":{"description":"Retrieve project codeword","prompt":"What is the project codeword mentioned earlier in this conversation? Reply with exactly that one word and nothing else."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_gnZDhmbVLP9hQ0PT42QW7314","status":"completed","content":[{"type":"content","content":{"type":"text","text":"MARMALADE"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_UaDvxfGDl2iEpKtIm8Bj3505","title":"subagent_fork","kind":"other","status":"in_progress","rawInput":{"description":"Recall the project codeword","prompt":"What is the project codeword mentioned earlier in this conversation? Reply with exactly that one word and nothing else."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_UaDvxfGDl2iEpKtIm8Bj3505","status":"completed","content":[{"type":"content","content":{"type":"text","text":"MARMALADE"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sub"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"agent"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" correctly"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" returned"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"M"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ARM"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"AL"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ADE"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\","}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" which"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" correct"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
@@ -106,7 +106,10 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ENT"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" stop"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"PAR"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ENT"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"_D"}}}}
diff --git a/examples/acp-agent/tests/snapshots/subagent-mixed/session.1.jsonl b/examples/acp-agent/tests/snapshots/subagent-mixed/session.1.jsonl
index 75cbc97f39..daac93ba55 100644
--- a/examples/acp-agent/tests/snapshots/subagent-mixed/session.1.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-mixed/session.1.jsonl
@@ -1,35 +1,36 @@
-{"type":"session","version":0,"id":"be77a907-c832-4870-8e71-beb6e57d3726","createdAt":1782133872837,"cwd":"/tmp/acp-snap-cwd-J8rqO2","parentSession":"6d80d699-1744-467a-80a3-e3c73110adda"}
-{"type":"turn/start","seq":0,"time":1782133872838,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1782133872838,"data":{"content":[{"type":"text","text":"Reply with exactly the word ALPHA and nothing else."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":1782133872838,"data":{"turn":1,"step":1}}
-{"type":"assistant/chunk","seq":3,"time":1782133874026,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
-{"type":"assistant/chunk","seq":4,"time":1782133874026,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
-{"type":"assistant/chunk","seq":5,"time":1782133874140,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
-{"type":"assistant/chunk","seq":6,"time":1782133874166,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" wants"}}}
-{"type":"assistant/chunk","seq":7,"time":1782133874166,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
-{"type":"assistant/chunk","seq":8,"time":1782133874166,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
-{"type":"assistant/chunk","seq":9,"time":1782133874166,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
-{"type":"assistant/chunk","seq":10,"time":1782133874166,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
-{"type":"assistant/chunk","seq":11,"time":1782133874167,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" exactly"}}}
-{"type":"assistant/chunk","seq":12,"time":1782133874190,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" the"}}}
-{"type":"assistant/chunk","seq":13,"time":1782133874190,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" word"}}}
-{"type":"assistant/chunk","seq":14,"time":1782133874190,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
-{"type":"assistant/chunk","seq":15,"time":1782133874190,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"AL"}}}
-{"type":"assistant/chunk","seq":16,"time":1782133874190,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"P"}}}
-{"type":"assistant/chunk","seq":17,"time":1782133874190,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"HA"}}}
-{"type":"assistant/chunk","seq":18,"time":1782133874215,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"\""}}}
-{"type":"assistant/chunk","seq":19,"time":1782133874216,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" and"}}}
-{"type":"assistant/chunk","seq":20,"time":1782133874216,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" nothing"}}}
-{"type":"assistant/chunk","seq":21,"time":1782133874216,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" else"}}}
-{"type":"assistant/chunk","seq":22,"time":1782133874216,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
-{"type":"assistant/chunk","seq":23,"time":1782133874241,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":24,"time":1782133874241,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"AL"}}}
-{"type":"assistant/chunk","seq":25,"time":1782133874241,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"P"}}}
-{"type":"assistant/chunk","seq":26,"time":1782133874241,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"HA"}}}
-{"type":"assistant/chunk","seq":27,"time":1782133874241,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with exactly the word \"ALPHA\" and nothing else."}}}}
-{"type":"assistant/chunk","seq":28,"time":1782133874242,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"ALPHA"}}}}
-{"type":"assistant/chunk","seq":29,"time":1782133874242,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":778,"outputTokens":23,"cacheReadTokens":384,"reasoningTokens":19}}}}
-{"type":"assistant/chunk","seq":30,"time":1782133874242,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":31,"time":1782133874242,"data":{"turn":1,"step":1,"content":[{"type":"reasoning","text":"The user wants me to reply with exactly the word \"ALPHA\" and nothing else."},{"type":"text","text":"ALPHA"}],"usage":{"inputTokens":778,"outputTokens":23,"cacheReadTokens":384,"reasoningTokens":19}},"sourceEventSeqs":[3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],"surfaceOp":"append"}
-{"type":"step/end","seq":32,"time":1782133874242,"data":{"turn":1,"step":1}}
-{"type":"turn/end","seq":33,"time":1782133874242,"data":{"turn":1,"reason":{"kind":"completed"}}}
+{"type":"session","version":0,"id":"888a6263-581d-488c-a63e-c9840f78cb8e","createdAt":1783329009135,"cwd":"/var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-26ySbT","parentSession":"a6d3b448-ed6f-452d-802b-3c537cb28c2d"}
+{"type":"turn/start","seq":0,"time":1783329009135,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":1,"time":1783329009135,"data":{"content":[{"type":"text","text":"Reply with exactly the word ALPHA and nothing else."}],"source":{"kind":"user"}},"surfaceOp":"append"}
+{"type":"step/start","seq":2,"time":1783329009137,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":3,"time":1783329009137,"data":{"header":{"config":{"model":"deepseek-v4-flash"},"system":"You are an AI agent powered by the DeepSeek Harness SDK.\n\nYou are a coding assistant powered by the deepseek-v4-flash model. Your working\ndirectory is /var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-26ySbT.\n\nVerify your work by running the code or tests. Keep answers brief and\nfactual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\n## Skills\nAvailable skills are listed below. Load a skill with the `skill` tool before following its instructions; do not infer or follow instructions from a skill body that has not been loaded.\n<available_skills>\n<skill name=\"dsh-plugin-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness Cordis plugins and packages.\n</skill>\n<skill name=\"dsh-skill-creator\" source=\"system\">\ndescription: Create or update DeepSeek Harness SKILL.md instructions.\nwhenToUse: Use when writing reusable agent instructions for DeepSeek Harness or adding system/project/user skills.\n</skill>\n</available_skills>","tools":[{"name":"subagent","description":"Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The complete, self-contained task for the subagent. It does not share this conversation's context, so include everything it needs."}},"required":["description","prompt"]}},{"name":"subagent_fork","description":"Delegate a task to a subagent that INHERITS this conversation: a child agent seeded with all completed turns so far (it does not see the current in-flight turn), returning only its final result. Use this when the subtask builds on this conversation's context — a follow-up analysis, a review, a continuation — without consuming this conversation's context for the work itself. You receive only its final answer, not its intermediate steps.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The task for the subagent. It already sees this conversation's completed turns, so build on them freely and state only what is new."}},"required":["description","prompt"]}},{"name":"todo_write","description":"Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).","parameters":{"type":"object","properties":{"todos":{"type":"array","description":"The COMPLETE task list, replacing any previous list.","items":{"type":"object","properties":{"content":{"type":"string","description":"What the task is — a short imperative line."},"status":{"type":"string","description":"pending (not started) | in_progress (now) | completed (done).","enum":["pending","in_progress","completed"]}},"required":["content","status"]}}},"required":["todos"]}},{"name":"read","description":"Read a UTF-8 text file and return line-numbered content.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to read, resolved by the filesystem backend."},"offset":{"type":"number","description":"1-based first line to return. Defaults to 1."},"limit":{"type":"number","description":"Maximum number of lines to return. Defaults to 2000."}},"required":["file_path"]}},{"name":"write","description":"Create or fully replace a UTF-8 text file.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to write, resolved by the filesystem backend."},"content":{"type":"string","description":"Full UTF-8 text content to write."}},"required":["file_path","content"]}},{"name":"edit","description":"Edit an existing UTF-8 text file by replacing literal text.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to edit, resolved by the filesystem backend."},"old_string":{"type":"string","description":"Literal text to replace. Must match exactly."},"new_string":{"type":"string","description":"Literal replacement text. Use an empty string to delete the match."},"replace_all":{"type":"boolean","description":"Replace all matches. Defaults to false; when false, old_string must appear exactly once."}},"required":["file_path","old_string","new_string"]}},{"name":"bash","description":"Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; poll it with `bash_output` and stop it with `bash_kill`.","parameters":{"type":"object","properties":{"command":{"type":"string","description":"The bash command to execute."},"description":{"type":"string","description":"Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"npm install\" → \"Install package dependencies\"."},"timeoutMs":{"type":"number","description":"Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."},"workdir":{"type":"string","description":"Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."},"run_in_background":{"type":"boolean","description":"Run in the background and return a task id immediately. No timeout applies."}},"required":["command","description"]}},{"name":"bash_output","description":"Read new output from a background bash task started with `bash` + `run_in_background`. Returns only output produced since the previous bash_output call, plus the task status. Tasks keep running while you do other work; poll again later for more output.","parameters":{"type":"object","properties":{"task_id":{"type":"string","description":"Task id returned by the bash tool."}},"required":["task_id"]}},{"name":"bash_kill","description":"Ask the executor to kill a running background bash task by task id.","parameters":{"type":"object","properties":{"task_id":{"type":"string","description":"Task id returned by the bash tool."}},"required":["task_id"]}},{"name":"skill","description":"Load the full instructions for one available skill by name. Use this when the current task matches a skill listed in the system prompt.","parameters":{"type":"object","properties":{"name":{"type":"string","description":"The exact skill name from the available skills list."}},"required":["name"]}}]},"reason":"initial"}}
+{"type":"assistant/chunk","seq":4,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"assistant/chunk","seq":5,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
+{"type":"assistant/chunk","seq":6,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
+{"type":"assistant/chunk","seq":7,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" wants"}}}
+{"type":"assistant/chunk","seq":8,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
+{"type":"assistant/chunk","seq":9,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
+{"type":"assistant/chunk","seq":10,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
+{"type":"assistant/chunk","seq":11,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
+{"type":"assistant/chunk","seq":12,"time":1783329009137,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" exactly"}}}
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diff --git a/examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl b/examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl
index d888f79a7d..138974d9c1 100644
--- a/examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/subagent-mixed/session.jsonl b/examples/acp-agent/tests/snapshots/subagent-mixed/session.jsonl
index 685bb0be68..c122e0be43 100644
--- a/examples/acp-agent/tests/snapshots/subagent-mixed/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-mixed/session.jsonl
@@ -1,346 +1,321 @@
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diff --git a/examples/acp-agent/tests/snapshots/subagent-mixed/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/subagent-mixed/stdout.golden.jsonl
index c0aad6ad3b..510d60b4c7 100644
--- a/examples/acp-agent/tests/snapshots/subagent-mixed/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-mixed/stdout.golden.jsonl
@@ -2,34 +2,16 @@
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" OK"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" tool"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" ("}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"fork"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ed"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" child"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" that"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" inher"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"its"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" this"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" conversation"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":")"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" prompt"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" '"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"What"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
@@ -108,7 +95,7 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" nothing"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" else"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":".'\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":".\"\n"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"3"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" After"}}}}
@@ -117,22 +104,22 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" '"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"PAR"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ENT"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"'.\n\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"\n\n"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Let"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" start"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" first"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" one"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" step"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" "}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"1"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_PoCyXrE8CAYDDrnx19eO7333","title":"subagent","kind":"other","status":"in_progress","rawInput":{"description":"Reply with ALPHA","prompt":"Reply with exactly the word ALPHA and nothing else."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_PoCyXrE8CAYDDrnx19eO7333","status":"completed","content":[{"type":"content","content":{"type":"text","text":"ALPHA"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_C2EZUTeZ6ZlGPG5Bq7If8782","title":"subagent","kind":"other","status":"in_progress","rawInput":{"description":"Reply with ALPHA","prompt":"Reply with exactly the word ALPHA and nothing else."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_C2EZUTeZ6ZlGPG5Bq7If8782","status":"completed","content":[{"type":"content","content":{"type":"text","text":"ALPHA"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" first"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sub"}}}}
@@ -162,65 +149,52 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ew"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ord"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Since"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" for"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ked"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" child"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" inher"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"its"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" this"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" conversation"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" it"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" should"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" know"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" cod"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ew"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ord"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" SA"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"FF"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"RON"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_BW0xGt0pKCAONv8lM1rC1333","title":"subagent_fork","kind":"other","status":"in_progress","rawInput":{"description":"Recall project codeword","prompt":"What is the project codeword mentioned earlier in this conversation? Reply with exactly that one word and nothing else."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_BW0xGt0pKCAONv8lM1rC1333","status":"completed","content":[{"type":"content","content":{"type":"text","text":"SAFFRON"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_IA4grgpHOuyCpfanePq09972","title":"subagent_fork","kind":"other","status":"in_progress","rawInput":{"description":"Get project codeword","prompt":"What is the project codeword mentioned earlier in this conversation? Reply with exactly that one word and nothing else."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_IA4grgpHOuyCpfanePq09972","status":"completed","content":[{"type":"content","content":{"type":"text","text":"SAFFRON"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Both"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sub"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"agents"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" have"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" returned"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"1"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" The"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" first"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" returned"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sub"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"agent"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"AL"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"P"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"HA"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" second"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" returned"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"2"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sub"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"agent"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_f"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ork"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"SA"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"FF"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"RON"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" ("}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" project"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" cod"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ew"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ord"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":")\n\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Now"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"PAR"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" PAR"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ENT"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"PAR"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ENT"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"_D"}}}}
diff --git a/examples/acp-agent/tests/snapshots/subagent-multi/session.1.jsonl b/examples/acp-agent/tests/snapshots/subagent-multi/session.1.jsonl
index 558d69c495..e829058875 100644
--- a/examples/acp-agent/tests/snapshots/subagent-multi/session.1.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-multi/session.1.jsonl
@@ -1,35 +1,36 @@
-{"type":"session","version":0,"id":"dba897b9-c416-4b56-928c-75d12c3e6b32","createdAt":1782087750369,"cwd":"/tmp/acp-snap-cwd-v6PaeC","parentSession":"2a50c62e-1d77-4b0e-bfab-3a9285e3aa32"}
-{"type":"turn/start","seq":0,"time":1782087750369,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1782087750369,"data":{"content":[{"type":"text","text":"Reply with exactly the word ALPHA and nothing else."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":1782087750370,"data":{"turn":1,"step":1}}
-{"type":"assistant/chunk","seq":3,"time":1782087750967,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
-{"type":"assistant/chunk","seq":4,"time":1782087750967,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
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diff --git a/examples/acp-agent/tests/snapshots/subagent-multi/session.2.jsonl b/examples/acp-agent/tests/snapshots/subagent-multi/session.2.jsonl
index d1335a20ba..71ef556d48 100644
--- a/examples/acp-agent/tests/snapshots/subagent-multi/session.2.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-multi/session.2.jsonl
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+{"type":"request/header","seq":3,"time":1783329008450,"data":{"header":{"config":{"model":"deepseek-v4-flash"},"system":"You are an AI agent powered by the DeepSeek Harness SDK.\n\nYou are a coding assistant powered by the deepseek-v4-flash model. Your working\ndirectory is /var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-9v8WCR.\n\nVerify your work by running the code or tests. Keep answers brief and\nfactual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. 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You receive only its final answer, not its intermediate steps.","parameters":{"type":"object","properties":{"description":{"type":"string","description":"A short (3-5 word) description of the delegated task, for display."},"prompt":{"type":"string","description":"The task for the subagent. It already sees this conversation's completed turns, so build on them freely and state only what is new."}},"required":["description","prompt"]}},{"name":"todo_write","description":"Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).","parameters":{"type":"object","properties":{"todos":{"type":"array","description":"The COMPLETE task list, replacing any previous list.","items":{"type":"object","properties":{"content":{"type":"string","description":"What the task is — a short imperative line."},"status":{"type":"string","description":"pending (not started) | in_progress (now) | completed (done).","enum":["pending","in_progress","completed"]}},"required":["content","status"]}}},"required":["todos"]}},{"name":"read","description":"Read a UTF-8 text file and return line-numbered content.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to read, resolved by the filesystem backend."},"offset":{"type":"number","description":"1-based first line to return. Defaults to 1."},"limit":{"type":"number","description":"Maximum number of lines to return. 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diff --git a/examples/acp-agent/tests/snapshots/subagent-multi/session.jsonl b/examples/acp-agent/tests/snapshots/subagent-multi/session.jsonl
index 1bbec1dbdc..c79aabd228 100644
--- a/examples/acp-agent/tests/snapshots/subagent-multi/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-multi/session.jsonl
@@ -1,213 +1,205 @@
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-{"type":"user/message","seq":1,"time":1782087748794,"data":{"content":[{"type":"text","text":"Use the subagent tool TWICE, once at a time, to delegate two subtasks to child agents. First subtask: 'Reply with exactly the word ALPHA and nothing else.' Second subtask (after the first returns): 'Reply with exactly the word BETA and nothing else.' After both subagents return, reply with the single word PARENT_DONE and stop. Do not use the bash tool."}],"source":{"kind":"user"}},"surfaceOp":"append"}
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+{"type":"assistant/chunk","seq":171,"time":1783329008464,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
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+{"type":"assistant/chunk","seq":174,"time":1783329008464,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"HA"}}}
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+{"type":"assistant/chunk","seq":179,"time":1783329008464,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"B"}}}
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+{"type":"assistant/chunk","seq":181,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"\"."}}}
+{"type":"assistant/chunk","seq":182,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":" Now"}}}
+{"type":"assistant/chunk","seq":183,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":" I"}}}
+{"type":"assistant/chunk","seq":184,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
+{"type":"assistant/chunk","seq":185,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
+{"type":"assistant/chunk","seq":186,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
+{"type":"assistant/chunk","seq":187,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"PAR"}}}
+{"type":"assistant/chunk","seq":188,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"ENT"}}}
+{"type":"assistant/chunk","seq":189,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"_D"}}}
+{"type":"assistant/chunk","seq":190,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":191,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"reasoning-delta","index":0,"text":"\"."}}}
+{"type":"assistant/chunk","seq":192,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":193,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":1,"text":"PAR"}}}
+{"type":"assistant/chunk","seq":194,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":1,"text":"ENT"}}}
+{"type":"assistant/chunk","seq":195,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":1,"text":"_D"}}}
+{"type":"assistant/chunk","seq":196,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":1,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":197,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"Both subagents have returned. First returned \"ALPHA\", second returned \"BETA\". Now I reply with \"PARENT_DONE\"."}}}}
+{"type":"assistant/chunk","seq":198,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"PARENT_DONE"}}}}
+{"type":"assistant/chunk","seq":199,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":107,"outputTokens":34,"cacheReadTokens":2304,"reasoningTokens":29}}}}
+{"type":"assistant/chunk","seq":200,"time":1783329008465,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":201,"time":1783329008465,"data":{"turn":1,"step":3,"content":[{"type":"reasoning","text":"Both subagents have returned. First returned \"ALPHA\", second returned \"BETA\". Now I reply with \"PARENT_DONE\"."},{"type":"text","text":"PARENT_DONE"}],"usage":{"inputTokens":107,"outputTokens":34,"cacheReadTokens":2304,"reasoningTokens":29}},"sourceEventSeqs":[162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200],"surfaceOp":"append"}
+{"type":"step/end","seq":202,"time":1783329008465,"data":{"turn":1,"step":3}}
+{"type":"turn/end","seq":203,"time":1783329008465,"data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/examples/acp-agent/tests/snapshots/subagent-multi/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/subagent-multi/stdout.golden.jsonl
index 1cfce85dc3..fefdc590b6 100644
--- a/examples/acp-agent/tests/snapshots/subagent-multi/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-multi/stdout.golden.jsonl
@@ -12,37 +12,36 @@
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 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" once"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" at"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" a"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" time"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sequentially"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" First"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" subt"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ask"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" delegate"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" a"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" task"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" that"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" After"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" then"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" delegate"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" another"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" task"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" returns"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" second"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" subt"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ask"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" replies"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Then"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" After"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" both"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" return"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
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@@ -52,21 +51,12 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Let"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" start"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_IUftLozvG1TYFSa8nO824493","title":"subagent","kind":"other","status":"in_progress","rawInput":{"description":"Reply with ALPHA","prompt":"Reply with exactly the word ALPHA and nothing else."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_IUftLozvG1TYFSa8nO824493","status":"completed","content":[{"type":"content","content":{"type":"text","text":"ALPHA"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" call"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_T91HrbiohZjyqZ7biX4s4408","title":"subagent","kind":"other","status":"in_progress","rawInput":{"description":"First subtask: ALPHA","prompt":"Reply with exactly the word ALPHA and nothing else."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_T91HrbiohZjyqZ7biX4s4408","status":"completed","content":[{"type":"content","content":{"type":"text","text":"ALPHA"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"First"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sub"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"agent"}}}}
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@@ -75,39 +65,44 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"'ll"}}}}
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diff --git a/examples/acp-agent/tests/snapshots/subagent-spawn/session.1.jsonl b/examples/acp-agent/tests/snapshots/subagent-spawn/session.1.jsonl
index 210d14e773..196936dcde 100644
--- a/examples/acp-agent/tests/snapshots/subagent-spawn/session.1.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-spawn/session.1.jsonl
@@ -1,35 +1,34 @@
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diff --git a/examples/acp-agent/tests/snapshots/subagent-spawn/session.jsonl b/examples/acp-agent/tests/snapshots/subagent-spawn/session.jsonl
index f66439dbe1..74f8024e3d 100644
--- a/examples/acp-agent/tests/snapshots/subagent-spawn/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-spawn/session.jsonl
@@ -1,142 +1,115 @@
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-{"type":"user/message","seq":1,"time":1782087697856,"data":{"content":[{"type":"text","text":"Use the subagent tool exactly once to delegate this subtask to a child agent: 'Reply with exactly the word CHILD_OK and nothing else.' After the subagent returns, reply with the single word PARENT_DONE and stop. Do not use the bash tool."}],"source":{"kind":"user"}},"surfaceOp":"append"}
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diff --git a/examples/acp-agent/tests/snapshots/subagent-spawn/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/subagent-spawn/stdout.golden.jsonl
index 3c78183324..48c08c6ce1 100644
--- a/examples/acp-agent/tests/snapshots/subagent-spawn/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-spawn/stdout.golden.jsonl
@@ -10,51 +10,27 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Reply"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_47FSCIL0HWM6bRnzkmT26193","status":"completed","content":[{"type":"content","content":{"type":"text","text":"CHILD_OK"}}]}}}
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@@ -78,10 +54,7 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
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diff --git a/examples/acp-agent/tests/snapshots/text-turn/session.jsonl b/examples/acp-agent/tests/snapshots/text-turn/session.jsonl
index 06381f8238..29b8d56025 100644
--- a/examples/acp-agent/tests/snapshots/text-turn/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/text-turn/session.jsonl
@@ -1,34 +1,36 @@
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Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).","parameters":{"type":"object","properties":{"todos":{"type":"array","description":"The COMPLETE task list, replacing any previous list.","items":{"type":"object","properties":{"content":{"type":"string","description":"What the task is — a short imperative line."},"status":{"type":"string","description":"pending (not started) | in_progress (now) | completed (done).","enum":["pending","in_progress","completed"]}},"required":["content","status"]}}},"required":["todos"]}},{"name":"read","description":"Read a UTF-8 text file and return line-numbered content.","parameters":{"type":"object","properties":{"file_path":{"type":"string","description":"Path to read, resolved by the filesystem backend."},"offset":{"type":"number","description":"1-based first line to return. Defaults to 1."},"limit":{"type":"number","description":"Maximum number of lines to return. 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diff --git a/examples/acp-agent/tests/snapshots/text-turn/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/text-turn/stdout.golden.jsonl
index e35715ccad..dda3afb9c5 100644
--- a/examples/acp-agent/tests/snapshots/text-turn/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/text-turn/stdout.golden.jsonl
@@ -14,8 +14,9 @@
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diff --git a/examples/acp-agent/tests/snapshots/todo-plan/session.jsonl b/examples/acp-agent/tests/snapshots/todo-plan/session.jsonl
index 6fc52b6a4b..f4b4f1935b 100644
--- a/examples/acp-agent/tests/snapshots/todo-plan/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/todo-plan/session.jsonl
@@ -1,124 +1,127 @@
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-{"type":"user/message","seq":1,"time":1782701599722,"data":{"content":[{"type":"text","text":"Use the todo_write tool to record a plan with exactly three todos: \"read the code\" (in_progress), \"write the fix\" (pending), \"run the tests\" (pending). Send all three in one todo_write call. Then reply with the single word DONE and stop."}],"source":{"kind":"user"}},"surfaceOp":"append"}
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index 052b86fca0..f3f2988f30 100644
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diff --git a/examples/acp-agent/tests/snapshots/tool-call-turn/stdout.golden.jsonl b/examples/acp-agent/tests/snapshots/tool-call-turn/stdout.golden.jsonl
index dff67d8e3a..c2028b72d9 100644
--- a/examples/acp-agent/tests/snapshots/tool-call-turn/stdout.golden.jsonl
+++ b/examples/acp-agent/tests/snapshots/tool-call-turn/stdout.golden.jsonl
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diff --git a/examples/acp-agent/tests/snapshots/workspace-edit/session.jsonl b/examples/acp-agent/tests/snapshots/workspace-edit/session.jsonl
index 2e284e6ca2..9bcd10c3c5 100644
--- a/examples/acp-agent/tests/snapshots/workspace-edit/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/workspace-edit/session.jsonl
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@@ -35,67 +115,27 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" read"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_SkCP8dgN8aCbLiZDcYa68316","title":"cat greeting.txt","kind":"execute","status":"in_progress","rawInput":"cat greeting.txt","content":[{"type":"content","content":{"type":"text","text":"Read greeting.txt to confirm"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_SkCP8dgN8aCbLiZDcYa68316","status":"completed","content":[{"type":"content","content":{"type":"text","text":"```console\nhello\nWORLD\n```"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_Ak1xJHPBCOA45VMtY0gi3784","title":"cat greeting.txt","kind":"execute","status":"in_progress","rawInput":"cat greeting.txt","content":[{"type":"content","content":{"type":"text","text":"Read file back with cat"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_Ak1xJHPBCOA45VMtY0gi3784","status":"completed","content":[{"type":"content","content":{"type":"text","text":"```console\nhello\nWORLD\n```"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" now"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" has"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" two"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" lines"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" as"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" expected"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"hello"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"WOR"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"LD"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"'ll"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" D"}}}}
diff --git a/knip.json b/knip.json
index 5e61645458..89cd2fffe7 100644
--- a/knip.json
+++ b/knip.json
@@ -21,6 +21,10 @@
       "project": ["src/**/*.ts"],
       "ignoreDependencies": ["cordis"]
     },
+    "packages/core/agent-loop": {
+      "entry": ["tests/**/*.spec.ts", "tests/**/*.e2e.ts"],
+      "project": ["src/**/*.ts", "tests/**/*.ts"]
+    },
     "packages/llm/llm-deepseek": {
       "entry": ["tests/**/*.spec.ts", "tests/**/*.e2e.ts"],
       "project": ["src/**/*.ts", "tests/**/*.ts"]
diff --git a/packages/compact/compact-basic/README.md b/packages/compact/compact-basic/README.md
index 81163973fc..f4400911c6 100644
--- a/packages/compact/compact-basic/README.md
+++ b/packages/compact/compact-basic/README.md
@@ -1,6 +1,6 @@
 # @deepseek-ai/dsh-compact-basic
 
-The **basic compaction backend**: a `BasicCompactService` implementing the `@deepseek-ai/dsh-compact` seam with a chars-per-token heuristic (the `charsPerToken` config, default 4), token-budget retention, and summarization routed through the agent request pipeline.
+The **basic compaction backend**: a `BasicCompactService` implementing the `@deepseek-ai/dsh-compact` seam with a chars-per-token heuristic (the `charsPerToken` config, default 4), token-budget retention, and summarization as a direct one-shot `ctx.llm.stream()` call (interceptable at `llm/stream`).
 
 This is the implementation tier of the compaction capability — see the [interface package](../compact/README.md) for the seam and the [capability-seam RFC](../../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md) for the design.
 
@@ -11,13 +11,13 @@ The abstract contract states only WHAT compaction does; this backend owns every
 - **Token estimation** — `estimateContentTokens()`: chars divided by the `charsPerToken` config (default 4) with per-block structural overhead (`text`/`reasoning` = `ceil(len/charsPerToken) + 4`, `tool-call` from name + arguments, `tool-result` recursive, unknown blocks via JSON length).
 - **Retention policy** — `compactIfNeeded()` walks the surface nodes tail→head summing per-node token estimates, and retains the smallest tail-run of WHOLE units (a closed step, or a single no-step node such as a pre-step `user/message` or inter-step `steering/message`) whose total reaches `retainTokens`; everything older is compacted. Retention is **turn-agnostic** — turn boundaries play no role, so a single runaway turn that alone exceeds the window compacts its OWN early closed steps rather than being retained verbatim (the failure mode that motivated dropping turn-protection: a tool-heavy turn must stay compactable or the harness dies exactly when compaction is needed). The only structural guard is **tool-pairing balance**: the compacted region's edges are balanced cuts on the surface (no unanswered tool-call crosses either edge), so it never splits a step's `assistant/message` tool-calls from their `tool/result`s. When the only compactable content left is an un-splittable open tail step, it declines (returns `null`) and retries once an older step closes. **Single-unit overflow is out of scope, by design**: if one retained unit (a single closed step, or a large pasted `user/message`) ALONE exceeds the budget, compaction cannot help and the call may go out over-budget — bounding an individual unit's size is a separate concern. `compactRegion()` enforces tool-pairing balance strictly, throwing on a boundary that would split a step. `dsh-session` exports `isToolPairingBalanced` for the check.
 - **Dynamic convergence** — no static summary-length config pretends to bound what the model will write. If framing/estimator/system overhead leaves the compacted surface above threshold, `compactIfNeeded()` re-compacts the head checkpoint up to `compactionRetries` extra times; if it still cannot get below threshold, it throws. A summary whose estimated stored size is not smaller than the shadowed content fails closed before it mutates the surface.
-- **Summarization** — `summarize()`: a `GenerateOptions` request assembled via `BlockAssembler` with a fixed system prompt that asks for a structured checkpoint (Primary Request and Intent · Key Technical Concepts · Files and Code · Errors and Fixes · Pending Tasks · Current Work · Next Step · Critical Context), every section mandatory, exact paths/commands/identifiers preserved. The request runs through the `agent/request` waterfall before `ctx.llm.stream()`, so router agents that choose the concrete model there also route compaction summaries. `maxTokens` is the provider-side generation cap; only text blocks from the model's reply are kept before the checkpoint is stored (reasoning is dropped so private chain-of-thought never leaks into the durable summary, and a stray `tool-call` is dropped so the synthesized `user/message` summary cannot land an orphaned call with no matching `tool-result`). The compacted region is flattened to a plain-text transcript first: text and reasoning contribute their text, and every non-text block (tool-call, tool-result, plugin-added types) contributes a type-tagged placeholder (`[tool-call: name(args)]`, `[tool-result: …]`, …) so the summarizer is told what existed rather than silently dropping it.
+- **Summarization** — `summarize()`: a `GenerateOptions` request assembled via `BlockAssembler` with a fixed system prompt that asks for a structured checkpoint (Primary Request and Intent · Key Technical Concepts · Files and Code · Errors and Fixes · Pending Tasks · Current Work · Next Step · Critical Context), every section mandatory, exact paths/commands/identifiers preserved. The request is a direct one-shot `ctx.llm.stream()` call — NOT a loop step, so it does not run `agent/request` (that seam shapes the loop's conversation requests); the model comes from `summarizationModel` falling back to the agent's own, and per-call routing happens at `llm/stream` like any other direct call. `maxTokens` is the provider-side generation cap; only text blocks from the model's reply are kept before the checkpoint is stored (reasoning is dropped so private chain-of-thought never leaks into the durable summary, and a stray `tool-call` is dropped so the synthesized `user/message` summary cannot land an orphaned call with no matching `tool-result`). The compacted region is flattened to a plain-text transcript first: text and reasoning contribute their text, and every non-text block (tool-call, tool-result, plugin-added types) contributes a type-tagged placeholder (`[tool-call: name(args)]`, `[tool-result: …]`, …) so the summarizer is told what existed rather than silently dropping it.
 - **Checkpoint framing** — the raw summary is not landed directly. `compactRegion()` wraps it in a checkpoint preamble (so a resuming model reads it as a checkpoint, not a fresh user request, and builds on the captured context rather than restating it) plus `<compacted-summary>…</compacted-summary>` tags. Because region compaction can be invoked manually, a surface may hold several checkpoints, so the framing does not claim everything after it is recent or verbatim. The tags make a prior checkpoint detectable in the transcript on the next compaction cycle: the summarization prompt then instructs the model to merge it in place (preserve still-true facts, drop stale ones) rather than re-summarize it verbatim — a cheap incremental merge that needs no extra log/event machinery. The unframed summary stays on the `compact/summary` provenance event.
 - **Surface mutation** — `compactRegion()` appends the `compact/start` → `compact/summary` → `compact/end` log records and the single `user/message` replace node carrying the framed summary (see the interface README).
 - **Auto-compaction** — an `agent/pre-step` listener delegates to `compactIfNeeded()` before every step (not just a turn's first — a tool-heavy turn grows the surface mid-turn, so a runaway turn still compacts, and per-step firing is the only moment to rescue it before overflow). `agent/pre-step` is a serial (awaited, in-order) surface-mutation checkpoint that fires after `turn/start` and BEFORE the step opens (`step/start`) and its request history is derived, so compaction mutates the surface — with its log-only `compact/*` records landing cleanly outside any step — and the loop derives once from the result: no double-derive, and the listener cannot see (or need to rewrite) an already-assembled `messages` array. The listener owns no threshold logic of its own (the single token-pressure check lives in `compactIfNeeded()`); because Cordis `serial` bails early on non-void return values, the listener returns `void` and does not use the dispatcher's bail channel as a veto surface.
 - **Failure handling** — the `compact/start … compact/end` bracket is a log-recorded lock: it makes a crash mid-summarization a detectable orphan (a `compact/start` with no `compact/end`), records provenance, and prevents a concurrent compaction. Two failure paths: a **crash** (the loop dies mid-summarization) leaves a dangling `compact/start` that is inert — `compact/*` events are log-only, the surface replacement never landed, so the full history derives fine and generic turn-repair closes the turn; a **recoverable** failure (summarization throws but the loop survives) appends `compact/end` with its `error` field set, leaving the surface untouched so the call proceeds with full history. Core session repair stays compaction-agnostic by design — it never learns about `compact/*`.
 
-`estimateContentTokens()` and `summarize()` are overridable hooks: a tokenizer-based or template-based backend can subclass `BasicCompactService` and override just those, reusing the retention walk and surface plumbing.
+`estimateContentTokens()` and `summarize()` are overridable hooks: a tokenizer-based or template-based backend can subclass `BasicCompactService` and override just those, reusing the retention walk and surface plumbing. `summarize()` returns the summary blocks together with the call envelope it actually used (`{ summary, model, maxTokens? }`) — the caller logs that envelope on the `compact/summary` provenance event, so an overriding backend reports its own envelope honestly.
 
 ## Config (`BasicCompactConfig`)
 
diff --git a/packages/compact/compact-basic/src/index.ts b/packages/compact/compact-basic/src/index.ts
index 2bc7b65a80..01fcadbaea 100644
--- a/packages/compact/compact-basic/src/index.ts
+++ b/packages/compact/compact-basic/src/index.ts
@@ -9,9 +9,10 @@
  *   to the next balanced tool-pairing boundary so a compacted region never
  *   splits a step's tool-call/result pair (an open tail step is never crossed —
  *   compaction declines and retries once it closes).
- * - **Summarization** — `ctx.llm.stream()` assembled via `BlockAssembler`
- *   (the single model-call surface; same path the loop uses) with a fixed
- *   condense-the-history system prompt routed through `agent/request`.
+ * - **Summarization** — a direct one-shot `ctx.llm.stream()` call assembled
+ *   via `BlockAssembler` with a fixed condense-the-history system prompt;
+ *   NOT a loop step, so `agent/request` never fires — interception happens
+ *   at `llm/stream` like any other direct call.
  * - **Surface mutation** — a single `user/message` replace node carries the
  *   summary; `compact/*` events are log-only lock + provenance records.
  * - **Auto-compaction** — an `agent/pre-step` listener delegates to
@@ -182,9 +183,9 @@ export class BasicCompactService extends CompactService {
       // log-only `compact/*` records and the replacement node cleanly outside a
       // step, so a crash mid-compaction leaves an inert orphan the turn-repair
       // closes — never a half-open step.
-      ctx.on('agent/pre-step', async (agent: Agent, turn: number, step: number, fullSystemPrompt: string, signal: AbortSignal) => {
+      ctx.on('agent/pre-step', async (agent: Agent, _turn: number, _step: number, fullSystemPrompt: string, signal: AbortSignal) => {
         try {
-          const result = await this.compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)
+          const result = await this.compactIfNeeded(agent, fullSystemPrompt, signal)
           if (result) {
             const after = this.estimateTokens(agent.session.deriveMessages(), fullSystemPrompt)
             ctx.logger.info(
@@ -271,9 +272,13 @@ export class BasicCompactService extends CompactService {
   }
 
   /**
-   * Summarize conversation text into content blocks via `agent/request` plus
-   * `ctx.llm.stream()` assembled through a `BlockAssembler` (the single
-   * model-call surface).
+   * Summarize conversation text into content blocks via `ctx.llm.stream()`
+   * assembled through a `BlockAssembler`. A direct one-shot model call, NOT a
+   * loop step: it does not run the `agent/request` waterfall (that seam shapes
+   * the loop's conversation requests); per-call
+   * interception happens at `llm/stream` like any other direct call. The model
+   * comes from `BasicCompactConfig.summarizationModel`, falling back to the
+   * agent's own model.
    * Override in a subclass for a template or remote summarizer.
    *
    * Honors the adapter failure contract: an adapter may report a model failure
@@ -283,8 +288,15 @@ export class BasicCompactService extends CompactService {
    *
    * Forwards `signal` into `GenerateOptions.signal` so an abort/dispose tears
    * down the in-flight summarization rather than orphaning the model call.
+   *
+   * Returns the summary blocks TOGETHER with the call envelope it actually
+   * used (`model`, `maxTokens`) — the caller logs the envelope on the
+   * `compact/summary` provenance event, so an overriding subclass (template
+   * or remote summarizer) reports its own envelope honestly.
    */
-  async summarize(text: string, agent: Agent, turn: number, step: number, signal?: AbortSignal): Promise<ContentBlock[]> {
+  async summarize(
+    text: string, agent: Agent, signal?: AbortSignal,
+  ): Promise<{ summary: ContentBlock[]; model: string; maxTokens?: number }> {
     const assembler = new BlockAssembler()
     const options: GenerateOptions = {
       model: this.config.summarizationModel || agent.options.model || '',
@@ -299,11 +311,10 @@ export class BasicCompactService extends CompactService {
     // exactOptionalPropertyTypes: only set `signal` when present — assigning
     // `undefined` to an optional `signal?: AbortSignal` is a type error.
     if (signal) options.signal = signal
-    const request = await this.ctx.waterfall('agent/request', agent, turn, step, options, () => Promise.resolve(options))
-    if (!request.model) {
-      throw new Error('no model available for summarization: set BasicCompactConfig.summarizationModel, AgentOptions.model, or supply one via the agent/request waterfall')
+    if (!options.model) {
+      throw new Error('no model available for summarization: set BasicCompactConfig.summarizationModel or AgentOptions.model')
     }
-    for await (const chunk of this.ctx.llm.stream(request)) {
+    for await (const chunk of this.ctx.llm.stream(options)) {
       assembler.push(chunk)
     }
 
@@ -315,7 +326,10 @@ export class BasicCompactService extends CompactService {
       throw new Error('summarization produced no text summary content')
     }
 
-    return summary
+    // config.maxTokens is required and validated positive, so this backend's
+    // envelope always carries the cap; the return type's optionality exists
+    // for overriding subclasses whose summarizer has none.
+    return { summary, model: options.model, maxTokens: this.config.maxTokens }
   }
 
   // ---- Core API (implements the abstract contract) ----
@@ -348,8 +362,6 @@ export class BasicCompactService extends CompactService {
    */
   override async compactIfNeeded(
     agent: Agent,
-    turn: number,
-    step: number,
     fullSystemPrompt: string,
     signal: AbortSignal,
   ): Promise<CompactionResult | null> {
@@ -368,7 +380,7 @@ export class BasicCompactService extends CompactService {
         break
       }
 
-      result = await this.compactRegion(session, range.start, range.end, agent, turn, step, signal)
+      result = await this.compactRegion(session, range.start, range.end, agent, signal)
     }
 
     const totalTokens = this.estimateTokens(session.deriveMessages(), fullSystemPrompt)
@@ -385,8 +397,6 @@ export class BasicCompactService extends CompactService {
     start: number,
     end: number,
     agent: Agent,
-    turn: number,
-    step: number,
     signal?: AbortSignal,
   ): Promise<CompactionResult> {
     // Resolve the range by surface POSITION, not numeric seq interval. A prior
@@ -450,7 +460,7 @@ export class BasicCompactService extends CompactService {
     try {
       // --- Extract text and summarize ---
       const text = this._extractText(session, shadowedSeqs)
-      const summary = await this.summarize(text, agent, turn, step, signal)
+      const { summary, model, maxTokens } = await this.summarize(text, agent, signal)
 
       // Estimate token count of the shadowed content for provenance.
       let shadowedTokenCount = 0
@@ -472,6 +482,8 @@ export class BasicCompactService extends CompactService {
         shadowedRange: { start, end },
         shadowedSeqs,
         shadowedTokenCount,
+        model,
+        ...maxTokens !== undefined ? { maxTokens } : {},
       })
 
       // --- Surface replacement ---
diff --git a/packages/compact/compact-basic/tests/compact-basic.spec.ts b/packages/compact/compact-basic/tests/compact-basic.spec.ts
index 80c35d4b06..990d60190a 100644
--- a/packages/compact/compact-basic/tests/compact-basic.spec.ts
+++ b/packages/compact/compact-basic/tests/compact-basic.spec.ts
@@ -58,13 +58,13 @@ class TestCompactService extends BasicCompactService {
     return blocks.length * 10
   }
 
-  override async summarize(text: string, agent: Agent): Promise<ContentBlock[]> {
+  override async summarize(text: string, agent: Agent): Promise<{ summary: ContentBlock[]; model: string; maxTokens?: number }> {
     const model = this.config.summarizationModel || agent.options.model || ''
     this.summarizeCalls.push({ text, model })
     if (this.summarizeError) throw this.summarizeError
     const summary = this.mockSummaryQueue.shift() ?? this.mockSummary
     this.summaryOutputs.add(summary)
-    return summary
+    return { summary, model }
   }
 }
 
@@ -402,6 +402,9 @@ describe('BasicCompactService.compactRegion', () => {
     expect(startEvent).toBeDefined()
     expect(summaryEvent).toBeDefined()
     expect(endEvent).toBeDefined()
+    // The provenance record carries the summarize call's envelope, so "which
+    // model wrote this summary" is answerable from the log alone.
+    expect(summaryEvent?.type === 'compact/summary' && summaryEvent.data.model).toBe('test-model')
 
     // compact/* events are log-only — no surfaceOp (type system enforces this).
     const startRaw = startEvent as unknown as { surfaceOp?: unknown }
@@ -980,7 +983,7 @@ function compactIfNeeded(
   model: string,
   signal: AbortSignal,
 ) {
-  return svc.compactIfNeeded(stubAgent(session, model), 1, 1, fullSystemPrompt, signal)
+  return svc.compactIfNeeded(stubAgent(session, model), fullSystemPrompt, signal)
 }
 
 function compactRegion(
@@ -991,11 +994,11 @@ function compactRegion(
   model: string,
   signal?: AbortSignal,
 ) {
-  return svc.compactRegion(session, start, end, stubAgent(session, model), 1, 1, signal)
+  return svc.compactRegion(session, start, end, stubAgent(session, model), signal)
 }
 
 function summarize(svc: BasicCompactService, text: string, model: string) {
-  return svc.summarize(text, stubAgent(new Session(SessionId('summary')), model), 1, 1)
+  return svc.summarize(text, stubAgent(new Session(SessionId('summary')), model))
 }
 
 describe('BasicCompactService.summarize (real ctx.llm.stream)', () => {
@@ -1003,8 +1006,12 @@ describe('BasicCompactService.summarize (real ctx.llm.stream)', () => {
     const { ctx, adapter } = await ctxWithModel('SUMMARY TEXT')
     const svc = new BasicCompactService(ctx, cfg({ auto: false, maxTokens: 512 }))
 
-    const summary = await summarize(svc, 'User: hi\n\nAssistant: hello', 'test-model')
+    const { summary, model, maxTokens } = await summarize(svc, 'User: hi\n\nAssistant: hello', 'test-model')
     expect(summary).toEqual([{ type: 'text', text: 'SUMMARY TEXT' }])
+    // The returned envelope reports what the call actually used — the caller
+    // logs it on compact/summary (the reconstructability RFC).
+    expect(model).toBe('test-model')
+    expect(maxTokens).toBe(512)
     // The fixed system prompt and maxTokens flow through.
     expect(adapter.lastOptions!.system).toContain('compaction engine')
     expect(adapter.lastOptions!.system).toContain('## Next Step')
@@ -1035,7 +1042,7 @@ describe('BasicCompactService.summarize (real ctx.llm.stream)', () => {
     ])
     const svc = new BasicCompactService(ctx, cfg({ auto: false }))
 
-    const summary = await summarize(svc, 'User: hi', 'test-model')
+    const { summary } = await summarize(svc, 'User: hi', 'test-model')
 
     expect(summary).toEqual([{ type: 'text', text: 'PUBLIC SUMMARY' }])
   })
@@ -1231,15 +1238,20 @@ describe('BasicCompactService auto-compaction (agent/pre-step listener)', () =>
     expect(session.events.some(e => e.type === 'compact/start')).toBe(false)
   })
 
-  it('routes summarization through agent/request so router agents can choose the model', async () => {
+  it('summarization is interceptable at llm/stream (model routing for direct calls)', async () => {
     const { ctx, adapter } = await ctxWithModel('ROUTED SUMMARY', 'routed-model')
-    ctx.on('agent/request', async (_agent, _turn, _step, options, next) => {
+    // The summarize call is a direct one-shot model call, not a loop step: it
+    // does not run agent/request (that seam shapes the loop's conversation
+    // requests). llm/stream is its interception surface, and a hand-built
+    // request is not frozen, so mutate-then-next model routing works — the
+    // adapter resolves AFTER the waterfall, so the rewrite picks the adapter.
+    ctx.on('llm/stream', (options, next) => {
       options.model = 'routed-model'
       return next()
     })
     void new BasicCompactService(ctx, cfg({ contextWindow: 200, thresholdRatio: 0.5, retainTokens: 20 }))
     const session = multiTurnSession(5, 1)
-    const agent = stubAgent(session)
+    const agent = stubAgent(session, 'agent-model')
 
     await ctx.serial('agent/pre-step', agent, 1, 1, '', SIGNAL)
 
diff --git a/packages/compact/compact-basic/tests/compact-loop-repro.spec.ts b/packages/compact/compact-basic/tests/compact-loop-repro.spec.ts
index 319e30a73c..f2ca3ccdd0 100644
--- a/packages/compact/compact-basic/tests/compact-loop-repro.spec.ts
+++ b/packages/compact/compact-basic/tests/compact-loop-repro.spec.ts
@@ -41,8 +41,8 @@ class ReproCompactService extends BasicCompactService {
     return blocks.length * TOKENS_PER_BLOCK
   }
 
-  override async summarize(): Promise<ContentBlock[]> {
-    return [{ type: 'text', text: 'CHECKPOINT SUMMARY' }]
+  override async summarize(): Promise<{ summary: ContentBlock[]; model: string }> {
+    return { summary: [{ type: 'text', text: 'CHECKPOINT SUMMARY' }], model: 'stub' }
   }
 }
 
diff --git a/packages/compact/compact/README.md b/packages/compact/compact/README.md
index b49070c3b5..51184337dd 100644
--- a/packages/compact/compact/README.md
+++ b/packages/compact/compact/README.md
@@ -18,8 +18,8 @@ Both methods are **abstract** — the backend owns the entire strategy (token es
 
 | Member | Semantics |
 |---|---|
-| `compactIfNeeded(agent, turn, step, fullSystemPrompt, signal)` | Estimate the surface-derived history size; if over the backend's threshold, compact an older range via `compactRegion`, keeping recent context intact. Returns the `CompactionResult`, or `null` if nothing needed compacting. All parameters required — the loop's `agent/pre-step` checkpoint supplies the agent, lifecycle context, assembled `fullSystemPrompt`, and turn `signal`; router-aware summarizers can use the agent lifecycle context to route their own model call through `agent/request`. |
-| `compactRegion(session, start, end, agent, turn, step, signal?)` | Forcibly summarize surface nodes `[start, end]` (inclusive seqs) into a single replacement node. **Throws** if a compaction is already in progress, if `start`/`end` aren't surface nodes, or if `start` is positioned after `end` on the surface. The range is a SURFACE-POSITION span, not a numeric seq interval — after a prior replace lands a fresh high-seq summary node at the shadowed range's position, surface order no longer tracks seq order. |
+| `compactIfNeeded(agent, fullSystemPrompt, signal)` | Estimate the surface-derived history size; if over the backend's threshold, compact an older range via `compactRegion`, keeping recent context intact. Returns the `CompactionResult`, or `null` if nothing needed compacting. All parameters required — the loop's `agent/pre-step` checkpoint supplies the agent, assembled `fullSystemPrompt`, and turn `signal`. A backend's summarization request is a direct `ctx.llm.stream()` call (not a loop step), so per-call interception happens at `llm/stream`. |
+| `compactRegion(session, start, end, agent, signal?)` | Forcibly summarize surface nodes `[start, end]` (inclusive seqs) into a single replacement node. **Throws** if a compaction is already in progress, if `start`/`end` aren't surface nodes, or if `start` is positioned after `end` on the surface. The range is a SURFACE-POSITION span, not a numeric seq interval — after a prior replace lands a fresh high-seq summary node at the shadowed range's position, surface order no longer tracks seq order. |
 
 `compactIfNeeded` takes a required `signal`; `compactRegion`'s is optional. A backend that summarizes via `ctx.llm.stream()` **must** forward it into the call's `GenerateOptions.signal`, so an abort or fiber dispose tears down the in-flight summarization instead of leaving an orphaned model call running past the cancellation. The session being compacted comes from the agent context; the turn that the `compact/*` events belong to is recoverable from the log (the currently-open turn), so the backend stamps it from the log rather than trusting a caller-supplied value.
 
diff --git a/packages/compact/compact/src/index.ts b/packages/compact/compact/src/index.ts
index 37c94920f3..cc190ccd87 100644
--- a/packages/compact/compact/src/index.ts
+++ b/packages/compact/compact/src/index.ts
@@ -91,8 +91,6 @@ export abstract class CompactService extends Service {
    *   over-budget. Bounding an individual unit's size is a separate concern.
    *
    * @param agent - agent context owning the session surface and model options.
-   * @param turn - turn number of the pre-step checkpoint.
-   * @param step - step number about to start.
    * @param fullSystemPrompt - assembled system prompt, counted toward the estimate.
    * @param signal - cancellation signal. A backend summarizing via
    *   `ctx.llm.stream()` MUST forward this into the call's `GenerateOptions.signal`
@@ -102,8 +100,6 @@ export abstract class CompactService extends Service {
    */
   abstract compactIfNeeded(
     agent: CompactAgentContext,
-    turn: number,
-    step: number,
     fullSystemPrompt: string,
     signal: AbortSignal,
   ): Promise<CompactionResult | null>
@@ -129,8 +125,6 @@ export abstract class CompactService extends Service {
    * @param start - inclusive seq of the first surface node to compact.
    * @param end - inclusive seq of the last surface node to compact.
    * @param agent - agent context used by router-aware summarizers.
-   * @param turn - lifecycle turn forwarded to request-routing seams.
-   * @param step - lifecycle step forwarded to request-routing seams.
    * @param signal - optional cancellation signal. A backend that summarizes via
    *   `ctx.llm.stream()` MUST forward this into the call's `GenerateOptions.signal`
    *   so an abort/dispose tears down the in-flight summarization rather than
@@ -148,8 +142,6 @@ export abstract class CompactService extends Service {
     start: number,
     end: number,
     agent: CompactAgentContext,
-    turn: number,
-    step: number,
     signal?: AbortSignal,
   ): Promise<CompactionResult>
 }
diff --git a/packages/compact/compact/src/types.ts b/packages/compact/compact/src/types.ts
index ba886685d5..ba9834910f 100644
--- a/packages/compact/compact/src/types.ts
+++ b/packages/compact/compact/src/types.ts
@@ -32,6 +32,15 @@ declare module '@deepseek-ai/dsh-session' {
       shadowedRange: { start: number; end: number }
       shadowedSeqs: number[]
       shadowedTokenCount: number
+      /**
+       * The model that wrote the summary — the summarize call's envelope,
+       * reported by the backend that made the call, logged so the one-shot
+       * request is reconstructable from log + code and "which model wrote
+       * this summary" has a durable answer (the reconstructability RFC).
+       */
+      model: string
+      /** The generation cap the summarize call sent, when one applied. */
+      maxTokens?: number
     }
     /** Marks the end of a compaction — log-only, releases the lock. `error` set if summarization failed. */
     'compact/end': { turn: number; error?: string }
diff --git a/packages/compact/compact/tests/compact.spec.ts b/packages/compact/compact/tests/compact.spec.ts
index 5b9e033fcc..93c4e806ce 100644
--- a/packages/compact/compact/tests/compact.spec.ts
+++ b/packages/compact/compact/tests/compact.spec.ts
@@ -17,8 +17,6 @@ class StubCompactService extends CompactService {
 
   override async compactIfNeeded(
     _agent: CompactAgentContext,
-    _turn: number,
-    _step: number,
     _fullSystemPrompt: string,
     signal: AbortSignal,
   ): Promise<CompactionResult | null> {
@@ -31,8 +29,6 @@ class StubCompactService extends CompactService {
     start: number,
     end: number,
     _agent: CompactAgentContext,
-    _turn: number,
-    _step: number,
     signal?: AbortSignal,
   ): Promise<CompactionResult> {
     this.lastSignal = signal
@@ -43,6 +39,7 @@ class StubCompactService extends CompactService {
       shadowedRange: { start, end },
       shadowedSeqs: [],
       shadowedTokenCount: 0,
+      model: 'stub',
     })
     const endEvent = session.append('compact/end', { turn: 0 })
     return {
@@ -81,7 +78,7 @@ describe('CompactService seam', () => {
     const ctx = new Context()
     const svc = new StubCompactService(ctx)
     const session = new Session(SessionId('s'))
-    expect(await svc.compactIfNeeded(stubAgent(session), 1, 1, '', new AbortController().signal)).toBeNull()
+    expect(await svc.compactIfNeeded(stubAgent(session), '', new AbortController().signal)).toBeNull()
   })
 
   it('compact/* events merge into SessionEventMap and are log-only', async () => {
@@ -89,7 +86,7 @@ describe('CompactService seam', () => {
     const svc = new StubCompactService(ctx)
     const session = new Session(SessionId('s'))
 
-    const result = await svc.compactRegion(session, 0, 0, stubAgent(session, 'm'), 1, 1)
+    const result = await svc.compactRegion(session, 0, 0, stubAgent(session, 'm'))
 
     const startEvent = session.events.find(e => e.type === 'compact/start')
     expect(startEvent).toBeDefined()
@@ -107,10 +104,10 @@ describe('CompactService seam', () => {
     const session = new Session(SessionId('s'))
     const controller = new AbortController()
 
-    await svc.compactRegion(session, 0, 0, stubAgent(session, 'm'), 1, 1, controller.signal)
+    await svc.compactRegion(session, 0, 0, stubAgent(session, 'm'), controller.signal)
     expect(svc.lastSignal).toBe(controller.signal)
 
-    await svc.compactIfNeeded(stubAgent(session), 1, 1, '', controller.signal)
+    await svc.compactIfNeeded(stubAgent(session), '', controller.signal)
     expect(svc.lastSignal).toBe(controller.signal)
   })
 })
diff --git a/packages/core/agent-loop/README.md b/packages/core/agent-loop/README.md
index 46367c84c8..87218d5ede 100644
--- a/packages/core/agent-loop/README.md
+++ b/packages/core/agent-loop/README.md
@@ -57,9 +57,11 @@ forever:
       drain steering
       assembly = systemPrompt.assemble({agent})  ⟵ renderPrompt(assembly) IS the full prompt
       await serial agent/pre-step        ⟵ surface mutation (compaction) outside the step
-      session('step/start')
-      request = waterfall agent/request
-      stream llm.stream(request) → session('assistant/chunk')
+      boundary = session.deriveMessages()   ⟵ reconstruction boundary: same sync frame,
+      session('step/start')                     strictly before step/start
+      config = waterfall agent/request       ⟵ frozen seed; return a replacement to switch
+      session('request/header'[-delta])      ⟵ the header event this request owes the log
+      stream llm.stream(freeze({header..., messages: boundary})) → session('assistant/chunk')
       message = waterfall agent/step-result
       session('assistant/message')
       each tool-call: session('tool/call')
diff --git a/packages/core/agent-loop/src/loop.ts b/packages/core/agent-loop/src/loop.ts
index 0b84bcb83f..9484f0ad5f 100644
--- a/packages/core/agent-loop/src/loop.ts
+++ b/packages/core/agent-loop/src/loop.ts
@@ -8,10 +8,13 @@
  */
 
 import type { Context } from 'cordis'
-import type { FinishReason, GenerateOptions, Message } from '@deepseek-ai/dsh-llm'
-import { BlockAssembler, HarnessError } from '@deepseek-ai/dsh-llm'
+import type { FinishReason, GenerateOptions, LlmCallConfig, Message } from '@deepseek-ai/dsh-llm'
+import { BlockAssembler, HarnessError, deepFreeze } from '@deepseek-ai/dsh-llm'
 import type { ContinuationDecision, HookContext, PromptDecision } from '@deepseek-ai/dsh-agent'
+import { canonicalHeader } from '@deepseek-ai/dsh-session'
 import type { Session, TurnEndReason, TurnTrigger } from '@deepseek-ai/dsh-session'
+import { createTransmissionLog, recordRequestHeader } from './request-log.ts'
+import type { TransmissionLog } from './request-log.ts'
 import { renderPrompt } from '@deepseek-ai/dsh-system-prompt'
 import type { PromptAssembly } from '@deepseek-ai/dsh-system-prompt'
 import type {} from '@deepseek-ai/dsh-tools'
@@ -155,10 +158,13 @@ export interface LoopHandle {
  *       assembly = ctx.systemPrompt.assemble({agent}) ⟵ waterfall system-prompt/assemble; renderPrompt
  *                                                        (persona section + {{variables}}) IS the full prompt
  *       await ctx.serial('agent/pre-step')            ⟵ surface mutation (compaction) OUTSIDE the step
- *       session('step/start')                         ⟵ durable step boundary (no agent/* mirror)
- *       req = {model, system, tools, messages: session.deriveMessages(), signal}
- *       req = waterfall agent/request                 ⟵ hooks/model-switch
- *       stream ctx.llm.stream(req)                    ⟵ waterfall llm/stream (raw chunks)
+ *       boundary = session.deriveMessages()           ⟵ the reconstruction boundary: snapshot in the
+ *       session('step/start')                            same sync frame, strictly before step/start
+ *       config = waterfall agent/request(config)      ⟵ frozen seed; a returned replacement switches
+ *       session('request/header'|'request/header-delta')  ⟵ the header event this request owes the
+ *                                                        log (initial/resume anchor, delta, fallback)
+ *       req = freeze({header..., messages: boundary, sessionId, signal})
+ *       stream ctx.llm.stream(req)                    ⟵ waterfall llm/stream (raw chunks, frozen req)
  *         session('assistant/chunk')
  *       msg = waterfall agent/step-result             ⟵ BEFORE the log append, so the
  *       session('assistant/message' {content, usage?})   session records what actually ran
@@ -181,6 +187,13 @@ export interface LoopHandle {
  * ```
  */
 export async function runLoop(ctx: Context, agent: ReactLoopAgent, handle: LoopHandle): Promise<void> {
+  // Per-instance transmission bookkeeping: whether THIS loop instance has
+  // anchored the log's header fold yet (its first request logs a
+  // 'initial'/'resume' request/header snapshot). Everything else the request
+  // needs is read from the session log itself — the loop holds no
+  // conversation state (the reconstructability RFC).
+  const transmission = createTransmissionLog()
+
   const { session } = agent
 
   while (!handle.isDisposed()) {
@@ -236,7 +249,7 @@ export async function runLoop(ctx: Context, agent: ReactLoopAgent, handle: LoopH
     // turn number is actually last in the log — a stale counter would collide.
     const turn = lastTurnNumber(session) + 1
     try {
-      await runTurn(ctx, agent, handle, turn)
+      await runTurn(ctx, agent, handle, turn, transmission)
     } catch (error: unknown) {
       // Backstop: runTurn rethrows only a PRE-turn throw (the invariant guard
       // before turn/start) — no turn/start was appended, so no turn is open and
@@ -271,7 +284,9 @@ export async function runLoop(ctx: Context, agent: ReactLoopAgent, handle: LoopH
   }
 }
 
-async function runTurn(ctx: Context, agent: ReactLoopAgent, handle: LoopHandle, turn: number): Promise<void> {
+async function runTurn(
+  ctx: Context, agent: ReactLoopAgent, handle: LoopHandle, turn: number, transmission: TransmissionLog,
+): Promise<void> {
   const { session } = agent
 
   // --- Pre-turn. A throw here (the invariant guard) is owed NO turn/end —
@@ -474,6 +489,17 @@ async function runTurn(ctx: Context, agent: ReactLoopAgent, handle: LoopHandle,
         break
       }
 
+      // The reconstruction boundary (the reconstructability RFC): the request's
+      // messages are snapshotted HERE, in the same synchronous frame as the
+      // step/start append directly below — so the snapshot is exactly the
+      // derivation over the log prefix strictly before step/start's seq.
+      // Anything appended later — by a step/start session/event listener, an
+      // agent/request-window inject(), any concurrent task — lands after the
+      // boundary and joins the NEXT request. An external reconstructor
+      // recovers these exact messages by folding the surface over
+      // events[0..stepStartSeq).
+      const boundaryMessages = session.deriveMessages()
+
       // Mark the step open BEFORE the append: Session.append pushes the event
       // to the log before notifying session/event listeners, so a THROWING
       // step/start listener leaves step/start in the log. Setting stepOpen first
@@ -495,7 +521,7 @@ async function runTurn(ctx: Context, agent: ReactLoopAgent, handle: LoopHandle,
 
       let stepOutcome: { hadToolCalls: boolean; finish: FinishReason } | { error: Error }
       try {
-        stepOutcome = await runStep(ctx, agent, turn, step, assembly, fullSystemPrompt, abort.signal)
+        stepOutcome = await runStep(ctx, agent, turn, step, assembly, fullSystemPrompt, boundaryMessages, transmission, abort.signal)
       } catch (error: unknown) {
         stepOutcome = { error: toError(error) }
       } finally {
@@ -644,11 +670,12 @@ function drainSteering(agent: ReactLoopAgent, turn: number): boolean {
   return messages.length > 0
 }
 
-/** One step: derive request from the (already pre-step-mutated) surface →
- * stream model → record → execute tools. The caller assembles the system prompt
- * and fires the `agent/pre-step` seam BEFORE opening the step, then passes the
- * resulting `assembly`/`system` here, so the surface this step derives from
- * already reflects any compaction. */
+/** One step: build the request from the boundary snapshot + the step's
+ * header → log the header event the request owes → stream model → record →
+ * execute tools. The caller assembles the system prompt, fires the
+ * `agent/pre-step` seam, snapshots the derivation, and opens the step BEFORE
+ * calling this, so `boundaryMessages` is exactly the surface prefix at
+ * step/start and already reflects any compaction. */
 async function runStep(
   ctx: Context,
   agent: ReactLoopAgent,
@@ -656,23 +683,63 @@ async function runStep(
   step: number,
   assembly: PromptAssembly,
   system: string,
+  boundaryMessages: Message[],
+  transmission: TransmissionLog,
   signal: AbortSignal,
 ): Promise<{ hadToolCalls: boolean; finish: FinishReason }> {
   const { session, options } = agent
 
-  let request: GenerateOptions = {
-    model: options.model ?? '',
-    messages: session.deriveMessages(),
-    ...system ? { system } : {},
-    ...assembly.tools.length > 0 ? { tools: assembly.tools } : {},
-    sessionId: session.id,
-    signal,
-  }
-  request = await ctx.waterfall('agent/request', agent, turn, step, request, () => Promise.resolve(request))
-  if (!request.model) {
+  // Seed the call config: the first request of THIS loop instance seeds from
+  // current AgentOptions — explicit options always win over the logged
+  // baseline, which is what keeps fork model-overrides and resume-time
+  // reconfiguration correct. Later steps seed from the log's folded header,
+  // which by then is exactly what this instance last logged.
+  // One deep-cloned, frozen seed serves BOTH the listener chain and the
+  // no-listener fallback: structuredClone decouples it from the session's
+  // cached header fold (a raw reference would let a delegating listener
+  // mutate the fold in place and silently skip the delta log), and the freeze
+  // makes in-place shaping unrepresentable — a switch is a RETURNED
+  // replacement, which the header event below records.
+  const seedConfig: LlmCallConfig = deepFreeze(structuredClone(transmission.loggedHeader
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- loggedHeader ⟹ a snapshot is in the log
+    ? session.requestHeader()!.config
+    : { model: options.model ?? '' }))
+
+  // Shape the call config: listeners return a replacement to switch model or
+  // sampling (the seed is frozen — content shaping is not expressible here;
+  // model-visible content flows through the log channels). The header event
+  // below records whatever the request ACTUALLY uses, so a listener's switch
+  // is a logged, reconstructable fact, never silent drift.
+  const config = await ctx.waterfall('agent/request', agent, turn, step, seedConfig, () => Promise.resolve(seedConfig))
+  if (!config.model) {
     throw new Error(`agent "${agent.id}" has no model: set AgentOptions.model or supply one via the agent/request waterfall`)
   }
 
+  // The request header (the log's request/header* vocabulary): canonical form,
+  // recorded before dispatch so the log always explains the request.
+  const header = canonicalHeader({
+    config,
+    ...system ? { system } : {},
+    ...assembly.tools.length > 0 ? { tools: assembly.tools } : {},
+  })
+  recordRequestHeader(session, transmission, header)
+
+  // Build and freeze: the request is a pure function of (boundary snapshot,
+  // logged header) — llm/stream listeners and adapters read it, mutation
+  // throws. sessionId + frozen is the loop-built marker the dev invariant
+  // keys on.
+  const request: GenerateOptions = deepFreeze({
+    model: header.config.model,
+    messages: boundaryMessages,
+    ...header.system !== undefined ? { system: header.system } : {},
+    ...header.tools !== undefined ? { tools: header.tools } : {},
+    ...header.config.temperature !== undefined ? { temperature: header.config.temperature } : {},
+    ...header.config.maxTokens !== undefined ? { maxTokens: header.config.maxTokens } : {},
+    ...header.config.stop !== undefined ? { stop: header.config.stop } : {},
+    sessionId: session.id,
+    signal,
+  })
+
   // --- Model call (streaming-first; raw chunks are the replay record) ---
   const assembler = new BlockAssembler()
   const chunkSeqs: number[] = []
diff --git a/packages/core/agent-loop/src/request-log.ts b/packages/core/agent-loop/src/request-log.ts
new file mode 100644
index 0000000000..07c57b9ff9
--- /dev/null
+++ b/packages/core/agent-loop/src/request-log.ts
@@ -0,0 +1,68 @@
+/**
+ * Per-loop-instance transmission bookkeeping for the reconstructability
+ * contract: which header event to append before a request so the session log
+ * always explains the request (the reconstructability RFC). The loop is
+ * otherwise transmission-stateless — the comparison baseline is the log's own
+ * folded header (`Session.requestHeader()`), so resume and fork need no
+ * special path: a fresh loop instance simply logs a `'resume'` snapshot on
+ * its first request and deltas from there.
+ *
+ * @module dsh-agent-loop/request-log
+ */
+
+import { diffHeader, headerEquals, applyHeaderDelta } from '@deepseek-ai/dsh-session'
+import type { EpochHeader, Session } from '@deepseek-ai/dsh-session'
+
+/** Per-loop-instance bookkeeping: whether THIS instance has logged a header yet. */
+export interface TransmissionLog {
+  /** True once this loop instance appended its anchoring `request/header` snapshot. */
+  loggedHeader: boolean
+}
+
+/** Fresh bookkeeping for a newly-started loop instance. */
+export function createTransmissionLog(): TransmissionLog {
+  return { loggedHeader: false }
+}
+
+/**
+ * Append whatever header event this request owes the log, so folding the log
+ * reproduces the header the request was built under. Exactly one of four
+ * things happens:
+ *
+ * 1. This loop instance has not logged a header yet → a full `request/header`
+ *    snapshot anchors the fold: reason `'initial'` when the log has no header
+ *    events at all (a new conversation), `'resume'` when it does (process
+ *    restart, fork seed — the boundary itself is a recorded fact, so the
+ *    snapshot is appended even when nothing changed).
+ * 2. The header equals the folded baseline → nothing; the log already
+ *    explains this request.
+ * 3. It differs and the delta round-trips (`applyHeaderDelta` on the baseline
+ *    reproduces the header exactly) → a `request/header-delta`.
+ * 4. It differs and the delta encoding cannot express the change (a pure tool
+ *    reordering) → a full snapshot with reason `'fallback'`; deltas are an
+ *    encoding optimization, never a correctness dependency.
+ *
+ * @param session - the session whose log explains the request.
+ * @param state - this loop instance's bookkeeping (mutated on first log).
+ * @param header - the canonical header the request will ACTUALLY use
+ *   (post-`agent/request`).
+ */
+export function recordRequestHeader(session: Session, state: TransmissionLog, header: EpochHeader): void {
+  if (!state.loggedHeader) {
+    session.append('request/header', { header, reason: session.requestHeader() === undefined ? 'initial' : 'resume' })
+    state.loggedHeader = true
+    return
+  }
+  // This instance logged a snapshot, so the fold is necessarily defined.
+  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  const baseline = session.requestHeader()!
+  if (headerEquals(baseline, header)) return
+  const delta = diffHeader(baseline, header)
+  /* v8 ignore next -- headerEquals false ⟹ diffHeader defined: both compare the same three parts */
+  if (delta === undefined) return
+  if (headerEquals(applyHeaderDelta(baseline, delta), header)) {
+    session.append('request/header-delta', delta)
+  } else {
+    session.append('request/header', { header, reason: 'fallback' })
+  }
+}
diff --git a/packages/core/agent-loop/tests/loop.spec.ts b/packages/core/agent-loop/tests/loop.spec.ts
index b9270fa9d0..9dd38c5ae8 100644
--- a/packages/core/agent-loop/tests/loop.spec.ts
+++ b/packages/core/agent-loop/tests/loop.spec.ts
@@ -230,9 +230,8 @@ describe('agent loop', () => {
       assembly.variables['model'] = 'mock'
       return next()
     })
-    ctx.on('agent/request', async (_agent, _turn, _step, options, next) => {
-      options.model = 'mock'
-      return next()
+    ctx.on('agent/request', async (_agent, _turn, _step, config, _next) => {
+      return { ...config, model: 'mock' }
     })
     const agent = ctx.agentLoop.create(AgentId('a-late-model'), {})
 
@@ -428,20 +427,27 @@ describe('agent loop', () => {
     expect(agent.session.events.some(e => e.type === 'tool/result')).toBe(true)
   })
 
-  it('agent/request waterfall can rewrite the request (model-switch pattern)', async () => {
+  it('agent/request waterfall switches models by returning a replacement config; the switch is logged', async () => {
     const adapter = new MockAdapter([textResponse('ok')])
     const ctx = await harness(adapter)
     ctx.llm.registerAdapter(['other-model'], adapter)
     const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
 
-    ctx.on('agent/request', async (_agent, _turn, _step, options, next) => {
-      options.model = 'other-model'
-      return next()
+    ctx.on('agent/request', async (_agent, _turn, _step, config, _next) => {
+      // The seed is frozen — config is not a mutable per-call knob; a switch
+      // is proposed by returning a replacement, and the loop logs it.
+      expect(Object.isFrozen(config)).toBe(true)
+      expect(() => { (config as { model: string }).model = 'other-model' }).toThrow(TypeError)
+      return { ...config, model: 'other-model' }
     })
 
     send(agent, 'hi')
     await waitForIdle(ctx, agent)
     expect(adapter.requests[0]!.model).toBe('other-model')
+    // The header event records what the request ACTUALLY used — the switch is
+    // a reconstructable fact, not silent drift.
+    const headerEvent = agent.session.events.find(e => e.type === 'request/header')
+    expect(headerEvent?.type === 'request/header' && headerEvent.data.header.config.model).toBe('other-model')
   })
 
   it('agent/pre-step fires once per step before the step is opened', async () => {
diff --git a/packages/core/agent-loop/tests/request-cache.e2e.ts b/packages/core/agent-loop/tests/request-cache.e2e.ts
new file mode 100644
index 0000000000..5ccaa7e797
--- /dev/null
+++ b/packages/core/agent-loop/tests/request-cache.e2e.ts
@@ -0,0 +1,104 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import LlmService from '@deepseek-ai/dsh-llm'
+import SessionStore from '@deepseek-ai/dsh-session'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry, { defineTool } from '@deepseek-ai/dsh-tools'
+import AgentRegistry, { AgentId, type Agent } from '@deepseek-ai/dsh-agent'
+import AgentLoop from '@deepseek-ai/dsh-agent-loop'
+import * as LlmDeepSeek from '@deepseek-ai/dsh-llm-deepseek'
+
+/**
+ * With-key proof that log-derived requests translate into REAL provider cache
+ * hits: a multi-step tool turn (plus a follow-up turn) against the live
+ * DeepSeek API must report `cacheReadTokens > 0` on every request after the
+ * first — the adapter maps the provider's `prompt_cache_hit_tokens`, and the
+ * per-step usage recorded on `assistant/message` events is the production
+ * observable for cache behavior (the reconstructability RFC's measurement
+ * layer: prefix stability is corollary #1). Mocks prove the requests are
+ * append-extensions; only the real API proves those bytes actually hit the
+ * provider cache. Key-gated — skips entirely without $DEEPSEEK_API_KEY.
+ */
+
+// Long enough that the shared request prefix comfortably spans the provider's
+// cache-block granularity (64 tokens) from the very first request.
+const SYSTEM = 'You are a terse coding assistant used in an automated cache test. '
+  + 'Always follow instructions literally and exactly. When the user asks you to look '
+  + 'something up, call the lookup tool with the requested key and wait for its result '
+  + 'before answering. Never invent a value the tool has not returned. After the tool '
+  + 'returns, answer with a single short sentence that repeats the returned value '
+  + 'verbatim. Do not add explanations, do not use markdown, do not ask follow-up '
+  + 'questions. If the user asks anything else, answer in one short sentence.'
+
+let ctx: Context | undefined
+
+afterEach(async () => {
+  await ctx?.fiber.dispose()
+  ctx = undefined
+})
+
+async function loopHarness(): Promise<Context> {
+  const created = new Context()
+  await created.plugin(LlmService)
+  await created.plugin(SessionStore)
+  await created.plugin(SystemPrompt, { persona: SYSTEM })
+  await created.plugin(ToolRegistry)
+  await created.plugin(AgentRegistry)
+  await created.plugin(AgentLoop, { agents: [] })
+  await created.plugin(LlmDeepSeek, { models: ['deepseek-v4-flash'] })
+  created.tools.register(defineTool({
+    name: 'lookup',
+    description: 'Look up the stored value for a key.',
+    parameters: { key: { type: 'string', description: 'The key to look up.' } },
+    async execute(args) {
+      return [{ type: 'text', text: `value(${String(args.key)}) = azure-falcon-42` }]
+    },
+  }))
+  return created
+}
+
+function waitForIdle(context: Context, agent: Agent): Promise<void> {
+  return new Promise((resolve) => {
+    const dispose = context.on('agent/status', (subject, status) => {
+      if (subject === agent && status === 'idle') {
+        dispose()
+        resolve()
+      }
+    })
+  })
+}
+
+describe.skipIf(!process.env.DEEPSEEK_API_KEY)('log-derived request cache hits (real API)', () => {
+  it('every request after the first hits the provider prefix cache', async () => {
+    ctx = await loopHarness()
+    const agent = ctx.agentLoop.create(AgentId('cache-e2e'), { model: 'deepseek-v4-flash' })
+
+    // Turn 1: forces a tool call → at least two steps (two model requests).
+    agent.send([{ type: 'text', text: 'Look up the key "deploy-color" with the lookup tool and tell me the value.' }])
+    await waitForIdle(ctx, agent)
+    // Turn 2: a follow-up over the same (longer) prefix.
+    agent.send([{ type: 'text', text: 'Thanks. Repeat that value one more time.' }])
+    await waitForIdle(ctx, agent)
+
+    const usages = [...agent.session.events]
+      .filter(e => e.type === 'assistant/message')
+      .map(e => e.data.usage)
+    expect(usages.length).toBeGreaterThanOrEqual(3) // 2 steps in turn 1 + ≥1 in turn 2
+    for (const usage of usages) expect(usage).toBeDefined()
+
+    // The first request has nothing to hit; every later one shares its
+    // predecessor as a byte-identical prefix, so the provider must report
+    // cached prompt tokens (prompt_cache_hit_tokens → cacheReadTokens).
+    for (const usage of usages.slice(1)) {
+      expect(usage!.cacheReadTokens ?? 0).toBeGreaterThan(0)
+    }
+
+    // World-verification of the conversation itself: the tool value made it
+    // through the loop into the final answer.
+    const finalText = agent.session.deriveMessages().at(-1)!.content
+      .filter(block => block.type === 'text')
+      .map(block => block.text)
+      .join('')
+    expect(finalText).toContain('azure-falcon-42')
+  }, 180_000)
+})
diff --git a/packages/core/agent-loop/tests/request-log.spec.ts b/packages/core/agent-loop/tests/request-log.spec.ts
new file mode 100644
index 0000000000..a6befde84e
--- /dev/null
+++ b/packages/core/agent-loop/tests/request-log.spec.ts
@@ -0,0 +1,85 @@
+/**
+ * recordRequestHeader unit tests: exactly one of four things per request —
+ * an 'initial' snapshot (log has no header yet), a 'resume' snapshot (fresh
+ * loop instance over a log that has one), nothing (header unchanged), a
+ * round-tripping delta, or a 'fallback' snapshot when the delta encoding
+ * cannot express the change (pure tool reordering).
+ */
+
+import { describe, expect, it } from 'vitest'
+import { Session, SessionId, canonicalHeader } from '@deepseek-ai/dsh-session'
+import type { SessionEvent } from '@deepseek-ai/dsh-session'
+import type { ToolSchema } from '@deepseek-ai/dsh-llm'
+import { createTransmissionLog, recordRequestHeader } from '../src/request-log.ts'
+
+function tool(name: string, description = 'd'): ToolSchema {
+  return { name, description, parameters: { type: 'object' } }
+}
+
+function openSession(id: string): Session {
+  const session = new Session(SessionId(id))
+  session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+  return session
+}
+
+function headerEvents(session: Session): SessionEvent[] {
+  return session.events.filter(e => e.type === 'request/header' || e.type === 'request/header-delta')
+}
+
+describe('recordRequestHeader', () => {
+  it("anchors a new conversation with an 'initial' snapshot, then logs nothing while unchanged", () => {
+    const session = openSession('rl-initial')
+    const state = createTransmissionLog()
+    const header = canonicalHeader({ config: { model: 'm' }, system: 's', tools: [tool('t')] })
+
+    recordRequestHeader(session, state, header)
+    const [first] = headerEvents(session)
+    expect(first?.type === 'request/header' && first.data.reason).toBe('initial')
+
+    recordRequestHeader(session, state, header)
+    expect(headerEvents(session)).toHaveLength(1)
+  })
+
+  it("anchors a fresh loop instance over an anchored log with a 'resume' snapshot, even unchanged", () => {
+    const session = openSession('rl-resume')
+    const header = canonicalHeader({ config: { model: 'm' }, system: 's' })
+    recordRequestHeader(session, createTransmissionLog(), header)
+
+    // A second instance (process restart / fork): the boundary itself is a
+    // recorded fact — snapshot appended even though the header is identical.
+    recordRequestHeader(session, createTransmissionLog(), header)
+    const events = headerEvents(session)
+    expect(events).toHaveLength(2)
+    expect(events[1]?.type === 'request/header' && events[1].data.reason).toBe('resume')
+  })
+
+  it('logs a round-tripping delta for a mid-run change, and the fold reproduces the header', () => {
+    const session = openSession('rl-delta')
+    const state = createTransmissionLog()
+    const first = canonicalHeader({ config: { model: 'm' }, system: 'a\nb', tools: [tool('t')] })
+    recordRequestHeader(session, state, first)
+
+    const second = canonicalHeader({ config: { model: 'm' }, system: 'a\nc', tools: [tool('t'), tool('u')] })
+    recordRequestHeader(session, state, second)
+    const events = headerEvents(session)
+    expect(events).toHaveLength(2)
+    expect(events[1]?.type).toBe('request/header-delta')
+    expect(session.requestHeader()).toEqual(second)
+  })
+
+  it("records a change the delta cannot express (pure reordering) as a 'fallback' snapshot", () => {
+    const session = openSession('rl-fallback')
+    const state = createTransmissionLog()
+    const first = canonicalHeader({ config: { model: 'm' }, tools: [tool('a'), tool('b')] })
+    recordRequestHeader(session, state, first)
+
+    const reordered = canonicalHeader({ config: { model: 'm' }, tools: [tool('b'), tool('a')] })
+    recordRequestHeader(session, state, reordered)
+    const events = headerEvents(session)
+    expect(events).toHaveLength(2)
+    expect(events[1]?.type === 'request/header' && events[1].data.reason).toBe('fallback')
+    // The fold still lands on the exact header — deltas are an encoding
+    // optimization, never a correctness dependency.
+    expect(session.requestHeader()).toEqual(reordered)
+  })
+})
diff --git a/packages/core/agent-loop/tests/request-reconstruction.spec.ts b/packages/core/agent-loop/tests/request-reconstruction.spec.ts
new file mode 100644
index 0000000000..f1d6b02ac4
--- /dev/null
+++ b/packages/core/agent-loop/tests/request-reconstruction.spec.ts
@@ -0,0 +1,313 @@
+/**
+ * Loop-level reconstructability: every request the loop sends is a pure
+ * function of the session log — messages are the derivation at the step/start
+ * boundary, the header is the fold of request/header* events — and every
+ * request is an append-extension of its predecessor unless a logged event
+ * (compaction replace, header change) explains the difference. The requests
+ * recorded by the mock adapter are the observable; the offline-rebuild test
+ * at the bottom is the theorem stated end-to-end.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import LlmService from '@deepseek-ai/dsh-llm'
+import type { GenerateOptions } from '@deepseek-ai/dsh-llm'
+import SessionStore, { Session, SessionId, foldRequestHeader } from '@deepseek-ai/dsh-session'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry, { defineTool } from '@deepseek-ai/dsh-tools'
+import AgentRegistry, { AgentId } from '@deepseek-ai/dsh-agent'
+import AgentLoop, { ReactLoopAgent } from '@deepseek-ai/dsh-agent-loop'
+import { MockAdapter, textResponse, toolCallResponse } from './mock-adapter.ts'
+
+async function harness(adapter: MockAdapter, persona = 'stable base') {
+  const ctx = new Context()
+  await ctx.plugin(LlmService)
+  await ctx.plugin(SessionStore)
+  await ctx.plugin(SystemPrompt, { persona })
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  await ctx.plugin(AgentLoop, { agents: [] })
+  ctx.llm.registerAdapter(['mock'], adapter)
+  return ctx
+}
+
+function waitForIdle(ctx: Context, agent: ReactLoopAgent): Promise<void> {
+  return new Promise((resolve) => {
+    const dispose = ctx.on('agent/status', (subject, status) => {
+      if (subject === agent && status === 'idle') {
+        dispose()
+        resolve()
+      }
+    })
+  })
+}
+
+function send(agent: ReactLoopAgent, text: string) {
+  agent.send([{ type: 'text', text }])
+}
+
+/** Assert `previous` is a strict value-prefix of `current`. */
+function expectPrefixExtension(previous: GenerateOptions, current: GenerateOptions) {
+  expect(current.messages.length).toBeGreaterThan(previous.messages.length)
+  expect(current.messages.slice(0, previous.messages.length)).toEqual([...previous.messages])
+  expect(current.system).toEqual(previous.system)
+  expect(current.tools).toEqual(previous.tools)
+}
+
+function registerEcho(ctx: Context) {
+  ctx.tools.register(defineTool({
+    name: 'echo',
+    description: 'echo back',
+    parameters: { text: { type: 'string' } },
+    async execute(args) {
+      return [{ type: 'text', text: `echo: ${String(args.text)}` }]
+    },
+  }))
+}
+
+describe('request stability across the loop', () => {
+  it('each step request within a turn append-extends the previous, frozen end to end', async () => {
+    const adapter = new MockAdapter([
+      toolCallResponse('c1', 'echo', { text: 'one' }, 'first'),
+      toolCallResponse('c2', 'echo', { text: 'two' }, 'second'),
+      textResponse('done'),
+    ])
+    const ctx = await harness(adapter)
+    registerEcho(ctx)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'go')
+    await waitForIdle(ctx, agent)
+
+    expect(adapter.requests).toHaveLength(3)
+    expectPrefixExtension(adapter.requests[0]!, adapter.requests[1]!)
+    expectPrefixExtension(adapter.requests[1]!, adapter.requests[2]!)
+    for (const request of adapter.requests) {
+      expect(Object.isFrozen(request)).toBe(true)
+      expect(Object.isFrozen(request.messages)).toBe(true)
+    }
+    // One anchoring header snapshot; no further header events (nothing changed).
+    const headerEvents = agent.session.events.filter(e => e.type === 'request/header' || e.type === 'request/header-delta')
+    expect(headerEvents).toHaveLength(1)
+    expect(headerEvents[0]?.type === 'request/header' && headerEvents[0].data.reason).toBe('initial')
+  })
+
+  it('a later turn append-extends the previous turn (one conversation, one log)', async () => {
+    const adapter = new MockAdapter([textResponse('one'), textResponse('two')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'first')
+    await waitForIdle(ctx, agent)
+    send(agent, 'second')
+    await waitForIdle(ctx, agent)
+
+    expect(adapter.requests).toHaveLength(2)
+    expectPrefixExtension(adapter.requests[0]!, adapter.requests[1]!)
+  })
+
+  it('a compaction replace rewrites the resend, and the log explains it', async () => {
+    const adapter = new MockAdapter([textResponse('one'), textResponse('two')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'first')
+    await waitForIdle(ctx, agent)
+
+    // A pre-step listener compacts turn 1's history before turn 2's step —
+    // the sanctioned surface rewrite, landing OUTSIDE the step.
+    const preStep = ctx.on('agent/pre-step', () => {
+      preStep()
+      const session = agent.session
+      const nodes = session.surface.nodes
+      session.append('context/message', {
+        content: [{ type: 'text', text: '[summary of turn 1]' }],
+        source: { kind: 'plugin', plugin: 'test-compact' },
+      }, {
+        surfaceOp: { op: 'replace', start: nodes[0]!.seq, end: nodes[1]!.seq },
+        sourceEventSeqs: [nodes[0]!.seq, nodes[1]!.seq],
+      })
+    })
+
+    send(agent, 'second')
+    await waitForIdle(ctx, agent)
+
+    const second = adapter.requests[1]!
+    // The rewritten history: summary replaces turn 1's user+assistant pair.
+    expect(second.messages[0]!.content.some(b => b.type === 'text' && b.text.includes('[summary of turn 1]'))).toBe(true)
+    // No header event beyond the anchor: the replace is itself in the log.
+    expect(agent.session.events.filter(e => e.type === 'request/header')).toHaveLength(1)
+  })
+
+  it('a real system-prompt change is a logged header delta; a stable prompt logs nothing', async () => {
+    const adapter = new MockAdapter([textResponse('one'), textResponse('two'), textResponse('three')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'first')
+    await waitForIdle(ctx, agent)
+    send(agent, 'second')
+    await waitForIdle(ctx, agent)
+    // Identical assembly re-rendered per step is NOT a change.
+    expect(agent.session.events.filter(e => e.type === 'request/header-delta')).toHaveLength(0)
+
+    ctx.systemPrompt.section({ name: 'extra', order: 2, text: 'new guidance' })
+    send(agent, 'third')
+    await waitForIdle(ctx, agent)
+
+    const deltas = agent.session.events.filter(e => e.type === 'request/header-delta')
+    expect(deltas).toHaveLength(1)
+    expect(adapter.requests[2]!.system).toContain('new guidance')
+    // History is preserved across the change — only the header moved.
+    expect(adapter.requests[2]!.messages.length).toBeGreaterThan(adapter.requests[1]!.messages.length)
+  })
+
+  it('an inject() during the agent/request waterfall joins the NEXT request (the step/start boundary)', async () => {
+    const adapter = new MockAdapter([textResponse('one'), textResponse('two')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    let injected = false
+    ctx.on('agent/request', async (_agent, _turn, _step, _config, next) => {
+      if (!injected) {
+        injected = true
+        agent.inject([{ type: 'text', text: '[late context]' }], { source: { kind: 'plugin', plugin: 'test' } })
+      }
+      return next()
+    })
+
+    send(agent, 'first')
+    await waitForIdle(ctx, agent)
+    const first = adapter.requests[0]!
+    // The inject landed in the log after the boundary: not in THIS request…
+    expect(first.messages.some(m => m.content.some(b => b.type === 'text' && b.text.includes('[late context]')))).toBe(false)
+    expect(agent.session.events.some(e => e.type === 'context/message')).toBe(true)
+
+    send(agent, 'second')
+    await waitForIdle(ctx, agent)
+    // …but in the next one, at its logged position.
+    const second = adapter.requests[1]!
+    expect(second.messages.some(m => m.content.some(b => b.type === 'text' && b.text.includes('[late context]')))).toBe(true)
+  })
+
+  it('a mutation attempt on the frozen request content throws into the step (loud, not silent)', async () => {
+    const adapter = new MockAdapter([textResponse('one')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    const errors: Error[] = []
+    ctx.on('agent/error', (_agent, _turn, _step, error) => void errors.push(error))
+    ctx.on('llm/stream', (options, next) => {
+      // The historical failure mode this design kills: a listener rewriting
+      // request content in place. The freeze turns it into a loud error.
+      options.messages.push({ role: 'user', content: [{ type: 'text', text: 'sneaky' }] })
+      return next()
+    })
+
+    send(agent, 'go')
+    await waitForIdle(ctx, agent)
+
+    expect(errors).toHaveLength(1)
+    expect(errors[0]!.message).toMatch(/not extensible|frozen|read only|readonly/i)
+  })
+
+  it('a fresh loop instance over a seeded log anchors with a resume snapshot and stays cache-aligned', async () => {
+    const adapter = new MockAdapter([textResponse('one')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('gen1'), { model: 'mock' })
+    send(agent, 'first')
+    await waitForIdle(ctx, agent)
+
+    // Second generation: a new agent whose session is seeded with the first
+    // one's full log (the resume/fork path).
+    const adapter2 = new MockAdapter([textResponse('two')])
+    const ctx2 = await harness(adapter2)
+    const handle = ctx2.agents.create({
+      agentId: AgentId('gen2'),
+      sessionId: SessionId('gen2-session'),
+      seed: [...agent.session.events],
+      agentOptions: { model: 'mock' },
+    })
+    const agent2 = handle.agent as ReactLoopAgent
+    send(agent2, 'second')
+    await waitForIdle(ctx2, agent2)
+
+    const snapshots = agent2.session.events.filter(e => e.type === 'request/header')
+    expect(snapshots).toHaveLength(2)
+    expect(snapshots[1]?.type === 'request/header' && snapshots[1].data.reason).toBe('resume')
+    // Identical header across the restart: byte-identical continuation.
+    expect(adapter2.requests[0]!.system).toEqual(adapter.requests[0]!.system)
+    expectPrefixExtension(adapter.requests[0]!, adapter2.requests[0]!)
+  })
+
+  it('a delegating listener cannot mutate the seed through next() — the fold stays log-true', async () => {
+    const adapter = new MockAdapter([textResponse('one'), textResponse('two')])
+    const ctx = await harness(adapter)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    ctx.on('agent/request', async (_agent, _turn, _step, _config, next) => {
+      const config = await next()
+      // next() resolves the SAME frozen seed — in-place shaping after
+      // delegation is unrepresentable, so a "mutate what next() returned"
+      // listener cannot desync the log from the request (nor reach the
+      // session's cached header fold, which is deep-cloned away and itself
+      // frozen).
+      expect(Object.isFrozen(config)).toBe(true)
+      expect(() => { (config as { temperature?: number }).temperature = 0.9 }).toThrow(TypeError)
+      return config
+    })
+
+    send(agent, 'first')
+    await waitForIdle(ctx, agent)
+    send(agent, 'second')
+    await waitForIdle(ctx, agent)
+
+    // No delta was logged (nothing really changed), and the session's own
+    // fold is immutable state.
+    expect(agent.session.events.filter(e => e.type === 'request/header-delta')).toHaveLength(0)
+    expect(Object.isFrozen(agent.session.requestHeader())).toBe(true)
+    expect(adapter.requests[1]!.temperature).toBeUndefined()
+  })
+
+  it('THEOREM: every request rebuilds byte-equal from the session log alone', async () => {
+    const adapter = new MockAdapter([
+      toolCallResponse('c1', 'echo', { text: 'one' }, 'calling'),
+      textResponse('done'),
+      textResponse('after change'),
+    ])
+    const ctx = await harness(adapter)
+    registerEcho(ctx)
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'go')
+    await waitForIdle(ctx, agent)
+    ctx.systemPrompt.section({ name: 'extra', order: 2, text: 'now with guidance' })
+    ctx.on('agent/request', async (_agent, _turn, _step, config, _next) => ({ ...config, temperature: 0.5, maxTokens: 99, stop: ['<END>'] }))
+    send(agent, 'again')
+    await waitForIdle(ctx, agent)
+
+    expect(adapter.requests).toHaveLength(3)
+    const events = agent.session.events
+    const stepStarts = events.filter(e => e.type === 'step/start')
+    expect(stepStarts).toHaveLength(3)
+
+    adapter.requests.forEach((request, index) => {
+      const stepStart = stepStarts[index]!
+      // Messages: the derivation over the log prefix strictly before this
+      // step's step/start — rebuilt here through a completely fresh Session.
+      const rebuilt = new Session(SessionId(`rebuild-${index}`), structuredClone(events.slice(0, stepStart.seq)))
+      expect(structuredClone(request.messages)).toEqual(rebuilt.deriveMessages())
+
+      // Header: the fold of request/header* events up to this step's dispatch
+      // (its header event sits between step/start and the first chunk).
+      const firstChunk = events.find(e => e.type === 'assistant/chunk' && e.seq > stepStart.seq)!
+      const header = foldRequestHeader(events.slice(0, firstChunk.seq))!
+      expect(request.model).toBe(header.config.model)
+      expect(request.system).toEqual(header.system)
+      expect(structuredClone(request.tools ?? [])).toEqual(structuredClone(header.tools ?? []))
+      expect(request.temperature).toBe(header.config.temperature)
+      expect(request.maxTokens).toBe(header.config.maxTokens)
+      expect(request.stop).toEqual(header.config.stop)
+    })
+  })
+})
diff --git a/packages/core/agent-loop/tests/review-fixes.spec.ts b/packages/core/agent-loop/tests/review-fixes.spec.ts
index 21be9e8267..e487a2c428 100644
--- a/packages/core/agent-loop/tests/review-fixes.spec.ts
+++ b/packages/core/agent-loop/tests/review-fixes.spec.ts
@@ -399,9 +399,8 @@ describe('MEDIUM: misc registry and config fixes', () => {
     const ctx = await harness(adapter)
     const agent = ctx.agentLoop.create(AgentId('a1'), {}) // no model — router plugin decides
 
-    ctx.on('agent/request', async (_agent, _turn, _step, options, next) => {
-      options.model = 'mock'
-      return next()
+    ctx.on('agent/request', async (_agent, _turn, _step, config, _next) => {
+      return { ...config, model: 'mock' }
     })
 
     send(agent, 'go')
diff --git a/packages/core/agent/README.md b/packages/core/agent/README.md
index a6446bf7d1..9e15356ed0 100644
--- a/packages/core/agent/README.md
+++ b/packages/core/agent/README.md
@@ -44,7 +44,7 @@ Turn and step boundaries are NOT mirrored as `agent/*` emits: a consumer that ne
 - `agent/session-start` (emit) — fired once before the first turn; a listener seeds context via `agent.inject()` (it cannot veto startup).
 - `agent/prompt-submit` — decide what happens to one drained queued message before it becomes a `user/message`: `PromptDecision` = `allow` (optionally rewriting the prompt `content` or attaching `additionalContext`) or `block` (drop it; a batch whose every prompt is blocked opens a zero-step turn that ends `rejected`). Maps onto Claude Code's `UserPromptSubmit`.
 - `agent/pre-step` (serial) — mutate the session surface before the step opens and history is derived (compaction). Fires after `turn/start` and before `step/start`, so a listener's appended events land outside the step.
-- `agent/request` — mutate `GenerateOptions` before the model call (hooks, model switching, tool filtering)
+- `agent/request` — shape the call config before the model call: a frozen `LlmCallConfig` seed in, a replacement out (model switching, sampling overrides). Content is not shapeable here — every request is a pure function of the session log ([reconstructability RFC](../../../docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md)); the loop logs whatever config the request actually uses as a `request/header*` event
 - `agent/step-result` — post-process the assembled assistant message before tool dispatch (validates what the log records)
 - `agent/turn-continuation` — override the continue/stop decision via `ContinuationDecision` = `{action:'stop'}` or `{action:'continue', reason?}` (a `continue` `reason` is recorded as next-step steering in the same turn — the typed `/goal` pattern). Force-continue `/loop`, force-stop budget guard.
 
diff --git a/packages/core/agent/src/types.ts b/packages/core/agent/src/types.ts
index 1b4af61d9a..1fd6a57867 100644
--- a/packages/core/agent/src/types.ts
+++ b/packages/core/agent/src/types.ts
@@ -44,7 +44,7 @@
  */
 
 import type { Branded } from '@deepseek-ai/dsh-brand'
-import type { ContentBlock, GenerateOptions, Message, MessageSource } from '@deepseek-ai/dsh-llm'
+import type { ContentBlock, LlmCallConfig, Message, MessageSource } from '@deepseek-ai/dsh-llm'
 import type {} from '@deepseek-ai/dsh-system-prompt'
 
 /** Identifies one live agent in the registry. */
@@ -345,18 +345,28 @@ declare module 'cordis' {
      */
     'agent/prompt-submit'(agent: Agent, content: ContentBlock[], source: MessageSource, next: () => Promise<PromptDecision>): Promise<PromptDecision>
     /**
-     * Waterfall: mutate the fully-assembled {@link GenerateOptions} before the
-     * model call (hooks, model switching, tool filtering, …). Call `next()` to
-     * delegate, or return without it to short-circuit. For surface mutation that
-     * must precede history derivation (compaction), use {@link agent/pre-step}
-     * instead — by the time this fires, `options.messages` is already derived.
+     * Waterfall: shape the step's call configuration — model switching,
+     * sampling overrides — by returning a replacement {@link LlmCallConfig}
+     * (the frozen seed is the config the loop would otherwise use). Config is
+     * ALL a listener shapes here: every request is a pure function of the
+     * session log (the reconstructability RFC), so model-visible content
+     * flows through the log channels — `inject()`, steering, prompt-submit
+     * `additionalContext`, prompt sections via `system-prompt/assemble` —
+     * never through request mutation, and the loop records whatever config
+     * the request actually uses as a `request/header*` event before dispatch.
+     * The step's messages are already snapshotted when this fires (the
+     * `step/start` boundary): an `inject()` from a listener here lands in the
+     * log but joins the NEXT request. For surface mutation that must precede
+     * the snapshot (compaction), use {@link agent/pre-step}. Call `next()` to
+     * delegate, or return an {@link LlmCallConfig} without it to
+     * short-circuit.
      * @param agent - the agent making the model call.
      * @param turn - the open turn number.
      * @param step - the step whose request this is.
-     * @param options - the assembled request; listeners return a transformed copy.
+     * @param config - the config the loop would use (frozen); return a replacement to switch.
      * @mode waterfall
      */
-    'agent/request'(agent: Agent, turn: number, step: number, options: GenerateOptions, next: () => Promise<GenerateOptions>): Promise<GenerateOptions>
+    'agent/request'(agent: Agent, turn: number, step: number, config: LlmCallConfig, next: () => Promise<LlmCallConfig>): Promise<LlmCallConfig>
     /**
      * Waterfall: post-process the assembled assistant {@link Message} before
      * tool dispatch (validation, content rewriting, …).
diff --git a/packages/core/session/README.md b/packages/core/session/README.md
index 72ca52bfef..5cd374d0f4 100644
--- a/packages/core/session/README.md
+++ b/packages/core/session/README.md
@@ -35,8 +35,9 @@ Creates and holds event-sourced `Session` instances. Persistence is intentionall
 Plain class (not a Cordis Service). Create via `ctx.sessions.create()`.
 
 - `session.append(type, data, opts?): SessionEvent` — synchronous, never blocks on I/O. **Throws** if `data` is not losslessly JSON-serializable (BigInt, function, symbol, undefined, non-finite number, circular ref, or an exotic object like Map/Set/Date) — the event log is the durable source of truth, so this invariant is enforced at the source (exported as `isJsonValue` for backends to reuse on their replay/fork entry points). A third parameter `opts: SurfaceIntent` carries surface metadata: `surfaceOp` controls how the event enters the surface linked list, and `sourceEventSeqs` records provenance (the seq numbers of events this one derives from). It is **required** for the five `SurfaceEventType` events (every message-producing event must declare how it joins the surface) and rejected by the compiler for non-surface types. The marker requirement is enforced two ways: the typed overload makes `opts` mandatory when `type` is a specific `SurfaceEventType` literal, AND `append` **throws** at runtime if a surface-eligible event arrives with no `surfaceOp` — covering the case where `type` widens to the `SessionEventType` union (a caller iterating raw events, where the conditional overload collapses to optional) so a marker-less message event can never silently land in the log and vanish from `deriveMessages()`.
-- `session.deriveMessages(): Message[]` — derive the LLM message history by walking the surface linked list (skipping non-surface events like chunks and boundaries; a `replace` shadows the nodes it covers). The surface is the single source of derived history — there is no raw-log fallback.
-- `session.surface: SurfaceManager` — the derived surface, lazily rebuilt from `surfaceOp` markers in the log. Processes only new events (delta) on each access — the log is append-only, so prior events never change.
+- `session.deriveMessages(): Message[]` — the LLM message history, CACHED: each surface node is projected exactly once, when first seen (O(new nodes) per call; a surface rewrite rebuilds via `surface.replaceGeneration`). Returns a fresh array snapshot per call over SHARED, deep-frozen `Message` objects — cloned once off the log at projection time, so a consumer can never mutate logged data (mutation throws). The surface is the single source of derived history — there is no raw-log fallback.
+- `session.deriveEventMessage(event): Message | null` — the per-event projection `deriveMessages()` folds: one event's derived message (an unfrozen clone), or `null` when it produces none (a non-surface event, or an empty-content `assistant/message` hosting only usage). External reconstructors and the dev invariant fold the same function over a log prefix's surface, so no two paths can disagree about what a request's messages were (the reconstructability RFC).
+- `session.surface: SurfaceManager` — the derived surface, lazily rebuilt from `surfaceOp` markers in the log. Processes only new events (delta) on each access — the log is append-only, so prior events never change. `surface.replaceGeneration` is the rewrite signal: bumped by every folded `replace` and by `invalidate()`, never reset, so an incremental consumer comparing generations cannot be fooled.
 - `session.events`, `session.seq`, `session.id`
 - `session.header: SessionHeader` — immutable creation metadata (`version`, `id`, `createdAt`, optional `cwd`/`parentSession`/`seedLength`). Kept out of the event log (a storage concern, not replayable state); a minimal header (stamped with the current `SESSION_FORMAT_VERSION`) is synthesized for bare `Session` construction.
 
@@ -47,6 +48,10 @@ Plain class (not a Cordis Service). Create via `ctx.sessions.create()`.
 - `SurfaceNode` — `{ seq: number; prev: number | null; next: number | null }`, one node in the surface linked list.
 - `isSurfaceEvent(event)` / `isSurfaceEligibleType(type)` — the first narrows a `SessionEvent` to a fully-formed surface node (type is surface-eligible AND `surfaceOp` present); the second is the type-only check (is this one of the five `SurfaceEventType` values?), used to detect a surface-eligible event MISSING its marker — e.g. when validating a seed/load log.
 
+### Request-header reconstruction (`request-header.ts`)
+
+The `request/header` (full `EpochHeader` snapshot with a `RequestHeaderReason`) and `request/header-delta` (system line-trim / name-keyed tools delta / whole config) events make the request envelope logged session state, so every conversation request is a pure function of the log. The pure trio reconstructs it: `foldRequestHeader(events)` folds a log (or any prefix) into the header in force; `diffHeader(prev, next)` encodes a change (undefined when equal); `applyHeaderDelta(prev, delta)` replays one. Writer contract: every logged delta is round-trip-verified (`apply(prev, delta)` deep-equals the new header) with a `'fallback'` snapshot when the encoding cannot express the change (a pure tool reordering), so folding never needs error recovery on a well-formed log. `canonicalHeader` pins the one representation of absence (empty system/tools ≡ absent fields).
+
 ### Session event vocabulary (`types.ts`)
 
 The append-only log's event types, enumerated member by member — payloads, surface badges, provenance — in the generated [persistence log event catalog](../../../docs/persistence-catalog/log-events.md). Token usage rides on `assistant/message.usage`; an operational error's step is on `turn/end.reason` for `kind: 'error'`.
diff --git a/packages/core/session/src/index.ts b/packages/core/session/src/index.ts
index fa9bbb5ba4..18c7b4a8a2 100644
--- a/packages/core/session/src/index.ts
+++ b/packages/core/session/src/index.ts
@@ -8,11 +8,13 @@
 
 import { Context, Service } from 'cordis'
 import { isAbsolute } from 'node:path'
+import { deepFreeze } from '@deepseek-ai/dsh-llm'
 import type { ContentBlock, Message, MessageSource } from '@deepseek-ai/dsh-llm'
 import { SESSION_FORMAT_VERSION, SessionId } from './types.ts'
-import type { CreateSessionOptions, SessionEvent, SessionEventMap, SessionEventType, SessionHeader, SurfaceIntent, SurfaceEventType } from './types.ts'
+import type { CreateSessionOptions, EpochHeader, SessionEvent, SessionEventMap, SessionEventType, SessionHeader, SurfaceIntent, SurfaceEventType } from './types.ts'
 import { isJsonValue } from './json.ts'
 import { SurfaceManager, isSurfaceEligibleType } from './surface.ts'
+import { foldRequestHeader } from './request-header.ts'
 
 export * from './types.ts'
 export { isJsonValue } from './json.ts'
@@ -21,6 +23,7 @@ export { interruptedTurnClosers } from './repair.ts'
 export type { SurfaceNode } from './surface.ts'
 export { isSurfaceEvent, isSurfaceEligibleType } from './surface.ts'
 export { isToolPairingBalanced } from './tool-pairing.ts'
+export { applyHeaderDelta, canonicalHeader, diffHeader, foldRequestHeader, headerEquals } from './request-header.ts'
 
 declare module 'cordis' {
   interface Context {
@@ -234,53 +237,93 @@ export class Session {
     return event
   }
 
+  /** Cached fold of the request-header events — see {@link requestHeader}. */
+  private headerFold: EpochHeader | undefined
+  /** Log position (events consumed) the header fold has reached. */
+  private headerFoldSeq = 0
+
+  /**
+   * The {@link EpochHeader} in force after the log's last header event — the
+   * header the NEXT request will be compared against — or undefined before
+   * the first `request/header` snapshot. The live, incrementally-maintained
+   * form of `foldRequestHeader(session.events)`: each header event is folded
+   * once, when first seen, so a per-step read costs O(new events).
+   * @returns the folded header, or undefined when no header event exists yet.
+   */
+  requestHeader(): EpochHeader | undefined {
+    if (this.headerFoldSeq < this.log.length) {
+      // Frozen on update: the fold is session state exposed by reference — a
+      // consumer mutating it in place (instead of building a replacement)
+      // would desync every later comparison against the log, so mutation
+      // throws instead.
+      this.headerFold = deepFreeze(foldRequestHeader(this.log.slice(this.headerFoldSeq), this.headerFold))
+      this.headerFoldSeq = this.log.length
+    }
+    return this.headerFold
+  }
+
+  /** The derived-message cache: frozen projections, extended per unseen node. */
+  private derived: Message[] = []
+  /** Surface position (nodes projected) the cache has reached. */
+  private derivedNodes = 0
+  /** {@link SurfaceManager.replaceGeneration} the cache was built under. */
+  private derivedGeneration = 0
+
   /**
    * Derive the LLM message history by walking the session surface — the linked
    * list of message-producing events maintained by `surfaceOp` markers. The
    * surface is the single source of derived history: every message-producing
    * append records its `surfaceOp`, so a raw event with no marker (a chunk, a
    * turn boundary) is correctly absent, and a compaction `replace` deletes the
-   * shadowed nodes from the derivation.
+   * shadowed nodes from the derivation. The projection rules are
+   * {@link deriveEventMessage}, folded per node.
    *
-   * - `user/message` → user message
-   * - `assistant/message` → assistant message (chunks are skipped — they are
-   *   replay/UI data; the assembled message is authoritative for history). An
-   *   EMPTY-content assistant/message is skipped: a max-tokens step cut off with
-   *   no content still records an assistant/message to host its `usage`, but a
-   *   content-less assistant turn must not enter the provider transcript.
-   * - `tool/result` → user message carrying a tool-result block
-   * - `context/message` / `steering/message` → tagged synthetic user messages
-   *   at their chronological position
-   *
-   * The returned `content` is **deep-cloned** off the logged events: the loop
-   * hands these messages into the mutable `agent/request` waterfall and on to
-   * adapters, where mutating the request is sanctioned — but the session log
-   * is append-only by contract. Cloning at this boundary keeps in-flight
-   * mutation from reaching back and rewriting history (which would silently
-   * break replay equivalence). Cost is one structured clone per step,
-   * negligible next to a model call.
+   * CACHED: each surface node is projected exactly once, when first seen — a
+   * call costs O(new nodes), and a surface rewrite (a `replace`;
+   * {@link SurfaceManager.replaceGeneration}) rebuilds. The returned array is
+   * a fresh snapshot per call (later appends never grow an array a caller
+   * already holds); the `Message` objects in it are SHARED and **deep-frozen**
+   * — cloned once off the log at projection time, so consumers can never
+   * mutate logged data, and mutation attempts throw instead of silently
+   * diverging replay from history.
+   * @returns a fresh array of the shared, frozen derived history.
    */
   deriveMessages(): Message[] {
-    const messages: Message[] = []
-    for (const node of this.surface.nodes) {
+    const nodes = this.surface.nodes
+    const generation = this.surface.replaceGeneration
+    if (generation !== this.derivedGeneration) {
+      this.derived = []
+      this.derivedNodes = 0
+      this.derivedGeneration = generation
+    }
+    for (const node of nodes.slice(this.derivedNodes)) {
       // Surface nodes are built from this.log — node.seq is always a valid
       // index by construction. The non-null assertion expresses that invariant.
       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-      const msg = this._deriveOneMessage(this.log[node.seq]!)
+      const msg = this.deriveEventMessage(this.log[node.seq]!)
       // A surface node is one of the five message-producing types, but an
       // empty-content assistant/message (a max-tokens step that hosts only
       // usage) derives to null and must not enter the transcript.
-      if (msg) messages.push(msg)
+      if (msg) this.derived.push(deepFreeze(msg))
     }
-    return messages
+    this.derivedNodes = nodes.length
+    return [...this.derived]
   }
 
   /**
-   * Derive a single LLM message from one surface event, or null if it produces
-   * no message (an empty-content assistant/message that exists only to host
-   * usage).
+   * Project a single event into the LLM message it derives to, or null when
+   * it produces none — a non-surface event (chunk, boundary, log-only record)
+   * or an empty-content assistant/message (which exists only to host usage).
+   * The per-node pure function {@link deriveMessages} folds over the surface;
+   * an external reconstructor (or the dev invariant) folds the same function
+   * over a log prefix's surface to rebuild the exact messages any request was
+   * built from (the reconstructability RFC). The returned `content` is
+   * deep-cloned off the logged event: the log is append-only by contract, so
+   * no live reference to logged data leaves this boundary.
+   * @param event - the event to project.
+   * @returns the derived message, or null when the event produces none.
    */
-  private _deriveOneMessage(event: SessionEvent): Message | null {
+  deriveEventMessage(event: SessionEvent): Message | null {
     // Intentionally non-exhaustive: only message-producing events derive
     // history; turn/step boundaries, chunks, usage, and errors are
     // trace/replay data.
@@ -311,8 +354,9 @@ export class Session {
         const { content, source } = event.data
         return { role: 'user', content: renderTagged('steering', structuredClone(content), source) }
       }
-      /* v8 ignore next 2 -- unreachable: only surface nodes (the 5 message-producing types) reach here */
       default:
+        // A non-surface event (boundary, chunk, log-only record) projects to
+        // no message. Merge-extensible union: no assertNever here.
         return null
     }
   }
diff --git a/packages/core/session/src/request-header.ts b/packages/core/session/src/request-header.ts
new file mode 100644
index 0000000000..d83da16197
--- /dev/null
+++ b/packages/core/session/src/request-header.ts
@@ -0,0 +1,191 @@
+/**
+ * Request-header reconstruction utilities: the pure fold/diff/apply trio over
+ * the `request/header` / `request/header-delta` session events. Anyone
+ * holding a session log reconstructs the {@link EpochHeader} any request was
+ * built under by folding these events in log order; the loop uses the same
+ * functions to decide whether a step's header changed and to encode the
+ * change. Deltas are an encoding optimization with a safety valve — the
+ * writer round-trip-verifies every delta before appending and falls back to
+ * a full snapshot when the encoding cannot express the change — so folding
+ * never needs error recovery on a well-formed log.
+ *
+ * @module dsh-session/request-header
+ */
+
+import { callConfigEquals } from '@deepseek-ai/dsh-llm'
+import type { LlmCallConfig, ToolSchema } from '@deepseek-ai/dsh-llm'
+import type { EpochHeader, SessionEvent, SystemDelta, ToolsDelta } from './types.ts'
+
+/**
+ * Normalize a header to canonical form: an empty system prompt and an empty
+ * tool list become ABSENT fields, matching how requests are built (both
+ * request-build spreads skip empty values). Diff, fold, and comparison all
+ * operate on canonical headers, so "no system prompt" has exactly one
+ * representation.
+ * @param header - the header to normalize (not mutated).
+ * @returns the canonical header.
+ */
+export function canonicalHeader(header: EpochHeader): EpochHeader {
+  return {
+    config: header.config,
+    ...header.system !== undefined && header.system.length > 0 ? { system: header.system } : {},
+    ...header.tools !== undefined && header.tools.length > 0 ? { tools: header.tools } : {},
+  }
+}
+
+/** Split a canonical (possibly absent) system prompt into lines; absence is zero lines. */
+function systemLines(system: string | undefined): string[] {
+  return system === undefined ? [] : system.split('\n')
+}
+
+/** Join lines back into a canonical system value; zero lines is absence. */
+function joinSystem(lines: string[]): string | undefined {
+  return lines.length === 0 ? undefined : lines.join('\n')
+}
+
+/**
+ * Compute the line-level {@link SystemDelta} between two canonical system
+ * prompts: trim the common prefix and (non-overlapping) common suffix, and
+ * carry the replacement lines between them. Deterministic and library-free;
+ * with nothing shared it degenerates to a full replacement.
+ */
+function diffSystem(prev: string | undefined, next: string | undefined): SystemDelta {
+  const a = systemLines(prev)
+  const b = systemLines(next)
+  let keepStart = 0
+  while (keepStart < a.length && keepStart < b.length && a[keepStart] === b[keepStart]) keepStart += 1
+  let keepEnd = 0
+  while (
+    keepEnd < a.length - keepStart &&
+    keepEnd < b.length - keepStart &&
+    a[a.length - 1 - keepEnd] === b[b.length - 1 - keepEnd]
+  ) keepEnd += 1
+  return { keepStart, keepEnd, insert: b.slice(keepStart, b.length - keepEnd) }
+}
+
+/** Apply a {@link SystemDelta} to a canonical system prompt. */
+function applySystem(prev: string | undefined, delta: SystemDelta): string | undefined {
+  const a = systemLines(prev)
+  return joinSystem([...a.slice(0, delta.keepStart), ...delta.insert, ...a.slice(a.length - delta.keepEnd)])
+}
+
+/** Canonical JSON equality for tool schemas — sound because schemas are
+ * JSON-serializable by construction and both sides come from the same
+ * assembly path, so key insertion order matches when the values do. */
+function sameSchema(a: ToolSchema, b: ToolSchema): boolean {
+  return JSON.stringify(a) === JSON.stringify(b)
+}
+
+/**
+ * Compute the name-keyed {@link ToolsDelta} between two canonical tool lists.
+ * A pure reordering produces an empty delta — the writer's round-trip guard
+ * catches that case and records a snapshot instead.
+ */
+function diffTools(prev: readonly ToolSchema[], next: readonly ToolSchema[]): ToolsDelta {
+  const prevByName = new Map(prev.map(tool => [tool.name, tool]))
+  const nextNames = new Set(next.map(tool => tool.name))
+  return {
+    added: next.filter(tool => !prevByName.has(tool.name)),
+    removed: prev.filter(tool => !nextNames.has(tool.name)).map(tool => tool.name),
+    changed: next.filter((tool) => {
+      const before = prevByName.get(tool.name)
+      return before !== undefined && !sameSchema(before, tool)
+    }),
+  }
+}
+
+/** Apply a {@link ToolsDelta} to a canonical tool list: drop removed, replace changed in place, append added. */
+function applyTools(prev: readonly ToolSchema[], delta: ToolsDelta): ToolSchema[] {
+  const removed = new Set(delta.removed)
+  const changedByName = new Map(delta.changed.map(tool => [tool.name, tool]))
+  const kept = prev
+    .filter(tool => !removed.has(tool.name))
+    .map(tool => changedByName.get(tool.name) ?? tool)
+  return [...kept, ...delta.added]
+}
+
+/**
+ * Field-wise equality over canonical headers — the cheap comparison the
+ * writer's round-trip guard runs (`applyHeaderDelta(prev, delta)` must equal
+ * the intended header) and the loop runs to skip logging an unchanged header.
+ * Tools compare per-schema IN ORDER (canonical JSON), so a pure reordering is
+ * correctly unequal.
+ * @param a - one canonical header.
+ * @param b - the other.
+ * @returns whether config, system, and tools (in order) all match.
+ */
+export function headerEquals(a: EpochHeader, b: EpochHeader): boolean {
+  if (!callConfigEquals(a.config, b.config) || a.system !== b.system) return false
+  const at = a.tools ?? []
+  const bt = b.tools ?? []
+  return at.length === bt.length && at.every((tool, i) => sameSchema(tool, bt[i] as ToolSchema))
+}
+
+/**
+ * Compute the `request/header-delta` payload between two canonical headers,
+ * or undefined when they are equal. The caller MUST round-trip the result
+ * ({@link applyHeaderDelta} on `prev` deep-equals `next`) before logging it —
+ * the encoding cannot express every change (a pure tool reordering) — and
+ * fall back to a full `request/header` snapshot when the check fails.
+ * @param prev - the folded header the log currently implies.
+ * @param next - the header the next request will actually use.
+ * @returns the delta payload, or undefined when nothing changed.
+ */
+export function diffHeader(
+  prev: EpochHeader, next: EpochHeader,
+): { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig } | undefined {
+  const delta: { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig } = {}
+  if (prev.system !== next.system) delta.system = diffSystem(prev.system, next.system)
+  const prevTools = prev.tools ?? []
+  const nextTools = next.tools ?? []
+  if (JSON.stringify(prevTools) !== JSON.stringify(nextTools)) delta.tools = diffTools(prevTools, nextTools)
+  if (!callConfigEquals(prev.config, next.config)) delta.config = next.config
+  return Object.keys(delta).length > 0 ? delta : undefined
+}
+
+/**
+ * Apply a `request/header-delta` payload to a canonical header, producing the
+ * canonical header it encodes. Total for well-formed logs (the writer only
+ * appends round-trip-verified deltas).
+ * @param prev - the folded header before the delta.
+ * @param delta - the logged delta payload.
+ * @returns the canonical header after the delta.
+ */
+export function applyHeaderDelta(
+  prev: EpochHeader, delta: { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig },
+): EpochHeader {
+  const system = delta.system !== undefined ? applySystem(prev.system, delta.system) : prev.system
+  const tools = delta.tools !== undefined ? applyTools(prev.tools ?? [], delta.tools) : prev.tools
+  return canonicalHeader({
+    config: delta.config ?? prev.config,
+    ...system !== undefined ? { system } : {},
+    ...tools !== undefined ? { tools } : {},
+  })
+}
+
+/**
+ * Fold the header events of a log (or any prefix of one) into the
+ * {@link EpochHeader} in force after the last of them: each
+ * `request/header` snapshot replaces the state, each `request/header-delta`
+ * amends it. The pure, offline form of reconstruction — external tooling and
+ * the dev invariant both use it; the live session tracks the same fold
+ * incrementally.
+ * @param events - session events in log order (non-header events are skipped).
+ * @param from - a previously folded state to continue from (the live session's
+ *   incremental cursor); omit to fold from nothing.
+ * @returns the folded header, or undefined when no header event exists yet.
+ */
+export function foldRequestHeader(events: readonly SessionEvent[], from?: EpochHeader): EpochHeader | undefined {
+  let state: EpochHeader | undefined = from
+  for (const event of events) {
+    if (event.type === 'request/header') {
+      state = canonicalHeader(event.data.header)
+    } else if (event.type === 'request/header-delta') {
+      if (state === undefined) {
+        throw new Error(`request/header-delta at seq ${event.seq} before any request/header snapshot: corrupt log`)
+      }
+      state = applyHeaderDelta(state, event.data)
+    }
+  }
+  return state
+}
diff --git a/packages/core/session/src/surface.ts b/packages/core/session/src/surface.ts
index 57f9a65864..37843970a2 100644
--- a/packages/core/session/src/surface.ts
+++ b/packages/core/session/src/surface.ts
@@ -72,6 +72,9 @@ export class SurfaceManager {
   /** The last processed seq. -1 forces a full rebuild on first access. */
   private _lastProcessedSeq = -1
 
+  /** Rewrite generation — see {@link replaceGeneration}. */
+  private _replaceGeneration = 0
+
   constructor(private log: readonly SessionEvent[]) {}
 
   /**
@@ -83,6 +86,23 @@ export class SurfaceManager {
     this._lastProcessedSeq = -1
     this._nodes = []
     this._nodeBySeq.clear()
+    // A wholesale rebuild is a rewrite: bump the generation so incremental
+    // consumers (the session's derived-message cache) discard their view.
+    this._replaceGeneration += 1
+  }
+
+  /**
+   * The surface's rewrite generation: bumped by every folded `replace` op and
+   * by {@link invalidate}. A replace is the ONE operation that rewrites the
+   * surface non-monotonically, so an incremental consumer of {@link nodes}
+   * (the session's derived-message cache) compares this between visits — an
+   * unchanged generation guarantees every node it has not seen is a pure tail
+   * append; a changed one means its view must rebuild. Monotonic: it never
+   * moves backwards, so comparisons cannot be fooled by a re-fold.
+   */
+  get replaceGeneration(): number {
+    if (this._lastProcessedSeq < this.log.length - 1) this._processDelta()
+    return this._replaceGeneration
   }
 
   /** The surface nodes in linked-list order (head to tail). */
@@ -155,5 +175,6 @@ export class SurfaceManager {
     if (nextNode) nextNode.prev = newSeq
     this._nodes.splice(startIdx, 0, newNode)
     this._nodeBySeq.set(newSeq, newNode)
+    this._replaceGeneration += 1
   }
 }
diff --git a/packages/core/session/src/types.ts b/packages/core/session/src/types.ts
index 82e080aa1a..ec227e9884 100644
--- a/packages/core/session/src/types.ts
+++ b/packages/core/session/src/types.ts
@@ -1,5 +1,5 @@
 import type { Branded } from '@deepseek-ai/dsh-brand'
-import type { CallId, ContentBlock, MessageSource, StreamChunk, TokenUsage } from '@deepseek-ai/dsh-llm'
+import type { CallId, ContentBlock, LlmCallConfig, MessageSource, StreamChunk, TokenUsage, ToolSchema } from '@deepseek-ai/dsh-llm'
 
 /** Identifies one session in the store (and its persistence artifacts). */
 export type SessionId = Branded<'SessionId'>
@@ -176,6 +176,67 @@ export interface TodoItem {
   status: 'pending' | 'in_progress' | 'completed'
 }
 
+/**
+ * The request header: everything about an LLM request besides its message
+ * content — the call configuration plus the rendered system prompt and tool
+ * schemas. Logged session state (the reconstructability RFC): a
+ * {@link SessionEventMap} `request/header` snapshot installs one, a
+ * `request/header-delta` amends it, and folding those events over the log
+ * (`foldRequestHeader`) reconstructs the header any request was built under.
+ * Canonical form: an empty system prompt and an empty tool list are ABSENT
+ * fields, matching how requests are built.
+ */
+export interface EpochHeader {
+  /** The conversation's call configuration (model + sampling scalars). */
+  config: LlmCallConfig
+  /** Rendered system prompt text; absent for a system-less request. */
+  system?: string
+  /** Assembled tool schemas; absent for a tool-less request. */
+  tools?: ToolSchema[]
+}
+
+/**
+ * Why a `request/header` snapshot was appended: `'initial'` — the log's first
+ * header (a new conversation); `'resume'` — a loop instance's first request
+ * over a log that already has header events (process restart, fork seed);
+ * `'fallback'` — a mid-run change the delta encoding could not round-trip
+ * (e.g. a pure tool reordering), recorded whole instead.
+ */
+export type RequestHeaderReason = 'initial' | 'resume' | 'fallback'
+
+/**
+ * Line-level edit of the system prompt: keep the first `keepStart` and last
+ * `keepEnd` lines of the previous text, with `insert` replacing everything
+ * between. Computed as a common-prefix/common-suffix trim — deterministic,
+ * library-free, degenerating to a full replacement when nothing is shared.
+ * Absence is encoded as zero lines (the canonical form has no empty-string
+ * system), so a transition to or from "no system prompt" round-trips.
+ */
+export interface SystemDelta {
+  /** Lines kept from the start of the previous system prompt. */
+  keepStart: number
+  /** Lines kept from the end of the previous system prompt. */
+  keepEnd: number
+  /** Lines replacing everything between the kept edges. */
+  insert: string[]
+}
+
+/**
+ * Tool-set edit keyed by tool name (names are unique — the registry rejects
+ * duplicates): `removed` names drop, `changed` schemas replace their
+ * predecessor in place, `added` schemas append at the end. A change this
+ * encoding cannot express (a pure reordering) fails the writer's round-trip
+ * guard and is recorded as a `'fallback'` snapshot instead.
+ */
+export interface ToolsDelta {
+  /** Schemas appended to the end of the tool list. */
+  added: ToolSchema[]
+  /** Names of schemas dropped from the tool list. */
+  removed: string[]
+  /** Schemas replacing the same-named predecessor in place. */
+  changed: ToolSchema[]
+}
+
 /**
  * The session event vocabulary — the append-only source of truth for an
  * agent's whole interaction history. The LLM message history is *derived*
@@ -274,6 +335,30 @@ export interface SessionEventMap {
    * cordis-catalog row.
    */
   'todo/write': { todos: TodoItem[] }
+  /**
+   * Full snapshot of the {@link EpochHeader} the NEXT request is built under,
+   * with the {@link RequestHeaderReason} it was recorded whole. Appended by
+   * the loop inside the step, before dispatch, on a loop instance's first
+   * request-building step (`'initial'`/`'resume'`) or when a delta failed its
+   * round-trip guard (`'fallback'`); always records what the request actually
+   * used, post-`agent/request`. Anchors the header fold: reconstruction reads
+   * the latest snapshot and applies the deltas after it. NOT a
+   * {@link SurfaceEventType}: it produces no LLM message — it is the request
+   * envelope, logged so every request is a pure function of the session log
+   * (the reconstructability RFC).
+   */
+  'request/header': { header: EpochHeader; reason: RequestHeaderReason }
+  /**
+   * Amendment to the folded {@link EpochHeader}: at least one of a
+   * {@link SystemDelta}, a {@link ToolsDelta}, or a whole replacement
+   * {@link LlmCallConfig} (four scalars — not worth diffing). Appended by the
+   * loop inside the step, before dispatch, when the header for this request
+   * differs from the fold of the log so far; the writer verifies
+   * `applyHeaderDelta(previous, delta)` reproduces the new header exactly and
+   * falls back to a `'fallback'` `request/header` snapshot when it cannot, so
+   * a logged delta ALWAYS round-trips. NOT a {@link SurfaceEventType}.
+   */
+  'request/header-delta': { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig }
 }
 
 export type SessionEventType = keyof SessionEventMap
diff --git a/packages/core/session/tests/derived-cache.spec.ts b/packages/core/session/tests/derived-cache.spec.ts
new file mode 100644
index 0000000000..b416d15639
--- /dev/null
+++ b/packages/core/session/tests/derived-cache.spec.ts
@@ -0,0 +1,112 @@
+/**
+ * Derived-message cache tests: the session projects each surface node exactly
+ * once (O(new nodes) per call), rebuilds on a surface rewrite (replace /
+ * invalidate — the replaceGeneration signal), returns a fresh array snapshot
+ * per call over shared frozen messages, and stays deep-equal to a from-scratch
+ * replay derivation at every step — the incremental==scratch property the
+ * reconstructability RFC's invariant enforces in dev at request time.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+
+function userText(session: Session, text: string): void {
+  session.append('user/message', { content: [{ type: 'text', text }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+}
+
+/** From-scratch oracle: replay the log into a fresh session and derive. */
+function scratch(session: Session): unknown {
+  return new Session(SessionId(`${session.id}-scratch-${session.seq}`), [...session.events]).deriveMessages()
+}
+
+describe('derived-message cache', () => {
+  it('stays deep-equal to a from-scratch replay derivation as the log grows', () => {
+    const session = new Session(SessionId('cache-grow'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    userText(session, 'one')
+    expect(session.deriveMessages()).toEqual(scratch(session))
+    userText(session, 'two')
+    session.append('assistant/message', { turn: 1, step: 1, content: [{ type: 'text', text: 'reply' }] }, { surfaceOp: 'append' })
+    expect(session.deriveMessages()).toEqual(scratch(session))
+    // An empty-content assistant/message (usage host) projects to nothing.
+    session.append('assistant/message', { turn: 1, step: 2, content: [], usage: { inputTokens: 1, outputTokens: 0 } }, { surfaceOp: 'append' })
+    expect(session.deriveMessages()).toEqual(scratch(session))
+  })
+
+  it('rebuilds on a surface replace and still matches scratch', () => {
+    const session = new Session(SessionId('cache-replace'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    userText(session, 'one')
+    userText(session, 'two')
+    const beforeReplace = session.deriveMessages()
+    expect(beforeReplace).toHaveLength(2)
+
+    const nodes = session.surface.nodes
+    session.append('context/message', {
+      content: [{ type: 'text', text: 'summary' }], source: { kind: 'plugin', plugin: 'compact' },
+    }, { surfaceOp: { op: 'replace', start: nodes[0]!.seq, end: nodes[1]!.seq }, sourceEventSeqs: [nodes[0]!.seq, nodes[1]!.seq] })
+
+    expect(session.deriveMessages()).toHaveLength(1)
+    expect(session.deriveMessages()).toEqual(scratch(session))
+    // The array a caller took before the replace is untouched.
+    expect(beforeReplace).toHaveLength(2)
+  })
+
+  it('returns a fresh array per call: later appends never grow a held snapshot', () => {
+    const session = new Session(SessionId('cache-snapshot'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    userText(session, 'one')
+    const first = session.deriveMessages()
+    userText(session, 'two')
+    const second = session.deriveMessages()
+    expect(first).toHaveLength(1)
+    expect(second).toHaveLength(2)
+    // Shared projection objects: the same frozen message instance, once ever.
+    expect(second[0]).toBe(first[0])
+    expect(Object.isFrozen(first[0])).toBe(true)
+  })
+
+  it('rebuilds after surface.invalidate() (the generation covers wholesale rebuilds too)', () => {
+    const session = new Session(SessionId('cache-invalidate'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    userText(session, 'one')
+    const before = session.deriveMessages()
+    session.surface.invalidate()
+    const after = session.deriveMessages()
+    expect(after).toEqual(before)
+    // A rebuild re-projects: fresh objects, same values.
+    expect(after[0]).not.toBe(before[0])
+  })
+})
+
+describe('Session.deriveEventMessage — the per-event projection', () => {
+  it('projects one appended event exactly as the full derivation projects its node', () => {
+    const session = new Session(SessionId('per-event'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const event = session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+    // The fold path (deriveMessages) and the per-event path share the
+    // projection, so an external reconstructor cannot disagree with the cache.
+    expect(session.deriveEventMessage(event)).toEqual(session.deriveMessages().at(-1))
+  })
+
+  it('clones content off the log: the projection never aliases the logged event', () => {
+    const session = new Session(SessionId('per-event-clone'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const event = session.append('user/message', { content: [{ type: 'text', text: 'orig' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+    const message = session.deriveEventMessage(event)!
+    expect(message.content).not.toBe(event.data.content)
+    // deriveEventMessage returns an unfrozen clone (the cache freezes ITS
+    // copies); mutating it must not reach the log.
+    ;(message.content[0] as { text: string }).text = 'mutated'
+    expect(session.deriveMessages().at(-1)!.content).toEqual([{ type: 'text', text: 'orig' }])
+  })
+
+  it('projects null for events that produce no message (boundaries, empty assistant)', () => {
+    const session = new Session(SessionId('per-event-null'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const boundary = session.append('step/start', { turn: 1, step: 1 })
+    expect(session.deriveEventMessage(boundary)).toBeNull()
+    const empty = session.append('assistant/message', { turn: 1, step: 1, content: [] }, { surfaceOp: 'append' })
+    expect(session.deriveEventMessage(empty)).toBeNull()
+  })
+})
diff --git a/packages/core/session/tests/properties.spec.ts b/packages/core/session/tests/properties.spec.ts
index 4be0cbcf6d..c3a887e14f 100644
--- a/packages/core/session/tests/properties.spec.ts
+++ b/packages/core/session/tests/properties.spec.ts
@@ -109,15 +109,17 @@ describe('Session properties', () => {
     ))
   })
 
-  it('every derived message has a known role and decoupled content', () => {
+  it('every derived message has a known role and is frozen (append-only contract)', () => {
     fc.assert(fc.property(logArb, (events) => {
       const session = build(events)
       const messages = session.deriveMessages()
       const before = structuredClone(session.events)
       for (const m of messages) {
         expect(['user', 'assistant', 'system']).toContain(m.role)
-        // Mutating derived content must not touch the log (append-only).
-        m.content.push({ type: 'text', text: 'mutation' })
+        // Derived messages are frozen shared projections: mutation THROWS
+        // (strict mode) instead of relying on per-call clones for isolation.
+        expect(Object.isFrozen(m)).toBe(true)
+        expect(() => { m.content.push({ type: 'text', text: 'mutation' }) }).toThrow(TypeError)
       }
       expect(session.events).toEqual(before)
     }))
diff --git a/packages/core/session/tests/request-header.spec.ts b/packages/core/session/tests/request-header.spec.ts
new file mode 100644
index 0000000000..c2368c46fe
--- /dev/null
+++ b/packages/core/session/tests/request-header.spec.ts
@@ -0,0 +1,140 @@
+/**
+ * Request-header utility tests: canonical form, the system line-diff
+ * (prefix/suffix trim), the name-keyed tools delta, config replacement, the
+ * round-trip contract (including the reorder case the encoding cannot
+ * express), and the log fold. These pin the reconstruction algebra: for every
+ * logged delta, apply(prev, delta) === next, and folding a log prefix yields
+ * the header its next request was built under.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { Session, SessionId, applyHeaderDelta, canonicalHeader, diffHeader, foldRequestHeader } from '@deepseek-ai/dsh-session'
+import type { EpochHeader, SessionEvent } from '@deepseek-ai/dsh-session'
+import type { ToolSchema } from '@deepseek-ai/dsh-llm'
+
+const CONFIG = { model: 'm' }
+
+function tool(name: string, description = 'd'): ToolSchema {
+  return { name, description, parameters: { type: 'object' } }
+}
+
+/** Round-trip helper: diff must reproduce `next` from `prev` exactly. */
+function roundTrip(prev: EpochHeader, next: EpochHeader): ReturnType<typeof diffHeader> {
+  const delta = diffHeader(prev, next)
+  if (delta !== undefined) {
+    expect(applyHeaderDelta(prev, delta)).toEqual(canonicalHeader(next))
+  }
+  return delta
+}
+
+describe('canonicalHeader', () => {
+  it('normalizes empty system and empty tools to absent fields', () => {
+    expect(canonicalHeader({ config: CONFIG, system: '', tools: [] })).toEqual({ config: CONFIG })
+    const full = canonicalHeader({ config: CONFIG, system: 's', tools: [tool('a')] })
+    expect(full.system).toBe('s')
+    expect(full.tools).toHaveLength(1)
+  })
+})
+
+describe('diffHeader / applyHeaderDelta', () => {
+  it('returns undefined for equal headers', () => {
+    const header = canonicalHeader({ config: CONFIG, system: 'a\nb', tools: [tool('t')] })
+    expect(diffHeader(header, header)).toBeUndefined()
+  })
+
+  it('encodes a mid-prompt line change as a prefix/suffix trim', () => {
+    const prev = canonicalHeader({ config: CONFIG, system: 'keep1\nold\nkeep2\nkeep3' })
+    const next = canonicalHeader({ config: CONFIG, system: 'keep1\nnew A\nnew B\nkeep2\nkeep3' })
+    const delta = roundTrip(prev, next)
+    expect(delta?.system).toEqual({ keepStart: 1, keepEnd: 2, insert: ['new A', 'new B'] })
+    expect(delta?.tools).toBeUndefined()
+    expect(delta?.config).toBeUndefined()
+  })
+
+  it('degenerates to a full replacement when nothing is shared, and round-trips absence transitions', () => {
+    const none = canonicalHeader({ config: CONFIG })
+    const some = canonicalHeader({ config: CONFIG, system: 'x\ny' })
+    const gained = roundTrip(none, some)
+    expect(gained?.system).toEqual({ keepStart: 0, keepEnd: 0, insert: ['x', 'y'] })
+    const lost = roundTrip(some, none)
+    expect(lost?.system).toEqual({ keepStart: 0, keepEnd: 0, insert: [] })
+  })
+
+  it('does not double-count overlapping prefix and suffix (repeated lines)', () => {
+    const prev = canonicalHeader({ config: CONFIG, system: 'a\na' })
+    const next = canonicalHeader({ config: CONFIG, system: 'a\na\na' })
+    roundTrip(prev, next)
+  })
+
+  it('encodes tool addition, removal, and in-place schema change by name', () => {
+    const prev = canonicalHeader({ config: CONFIG, tools: [tool('keep'), tool('drop'), tool('edit', 'before')] })
+    const next = canonicalHeader({ config: CONFIG, tools: [tool('keep'), tool('edit', 'after'), tool('new')] })
+    const delta = roundTrip(prev, next)
+    expect(delta?.tools?.added.map(t => t.name)).toEqual(['new'])
+    expect(delta?.tools?.removed).toEqual(['drop'])
+    expect(delta?.tools?.changed.map(t => t.name)).toEqual(['edit'])
+  })
+
+  it('round-trips a tool set gained from a tool-less header and lost back to one', () => {
+    const none = canonicalHeader({ config: CONFIG })
+    const some = canonicalHeader({ config: CONFIG, tools: [tool('t')] })
+    const gained = roundTrip(none, some)
+    expect(gained?.tools?.added.map(t => t.name)).toEqual(['t'])
+    const lost = roundTrip(some, none)
+    expect(lost?.tools?.removed).toEqual(['t'])
+  })
+
+  it('cannot express a pure reordering — the writer detects it via the round-trip check', () => {
+    const prev = canonicalHeader({ config: CONFIG, tools: [tool('a'), tool('b')] })
+    const next = canonicalHeader({ config: CONFIG, tools: [tool('b'), tool('a')] })
+    const delta = diffHeader(prev, next)
+    // A delta IS produced (the lists differ)…
+    expect(delta).toBeDefined()
+    // …but applying it cannot reproduce the new order — exactly the case the
+    // writer's guard turns into a 'fallback' snapshot.
+    expect(applyHeaderDelta(prev, delta!)).not.toEqual(next)
+  })
+
+  it('replaces the config whole and leaves untouched parts alone', () => {
+    const prev = canonicalHeader({ config: { model: 'm' }, system: 's', tools: [tool('t')] })
+    const next = canonicalHeader({ config: { model: 'm2', temperature: 0.1 }, system: 's', tools: [tool('t')] })
+    const delta = roundTrip(prev, next)
+    expect(delta).toEqual({ config: { model: 'm2', temperature: 0.1 } })
+  })
+})
+
+describe('foldRequestHeader', () => {
+  function headerEvents(session: Session): readonly SessionEvent[] {
+    return session.events
+  }
+
+  it('returns undefined on a log with no header events', () => {
+    const session = new Session(SessionId('fold-none'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    expect(foldRequestHeader(headerEvents(session))).toBeUndefined()
+  })
+
+  it('folds snapshot then deltas into the header in force, skipping unrelated events', () => {
+    const session = new Session(SessionId('fold'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const first = canonicalHeader({ config: { model: 'm' }, system: 'a\nb', tools: [tool('t')] })
+    session.append('request/header', { header: first, reason: 'initial' })
+    session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+
+    const second = canonicalHeader({ config: { model: 'm' }, system: 'a\nc', tools: [tool('t')] })
+    session.append('request/header-delta', diffHeader(first, second)!)
+    expect(foldRequestHeader(headerEvents(session))).toEqual(second)
+
+    // A later snapshot replaces the state wholesale (the 'resume'/'fallback' anchor).
+    const third = canonicalHeader({ config: { model: 'other' } })
+    session.append('request/header', { header: third, reason: 'resume' })
+    expect(foldRequestHeader(headerEvents(session))).toEqual(third)
+  })
+
+  it('throws on a delta before any snapshot (corrupt log)', () => {
+    const session = new Session(SessionId('fold-corrupt'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    session.append('request/header-delta', { config: { model: 'x' } })
+    expect(() => foldRequestHeader(headerEvents(session))).toThrow(/before any request\/header snapshot/)
+  })
+})
diff --git a/packages/core/session/tests/session.spec.ts b/packages/core/session/tests/session.spec.ts
index 27f8b5d420..4ff13940bc 100644
--- a/packages/core/session/tests/session.spec.ts
+++ b/packages/core/session/tests/session.spec.ts
@@ -78,19 +78,25 @@ describe('Session', () => {
     }, { surfaceOp: 'append' })
     const before = structuredClone(session.events)
 
-    // A request middleware / adapter mutates the messages it was handed.
+    // A misbehaving consumer tries to mutate the messages it was handed.
+    // Derived messages are frozen shared projections (cloned once off the
+    // log, then deep-frozen): every mutation attempt THROWS in strict mode —
+    // isolation by unrepresentability, not by per-call cloning.
     const messages = session.deriveMessages()
     const userBlock = messages[0]!.content[0]!
-    if (userBlock.type === 'text') userBlock.text = 'HACKED'
+    expect(() => { if (userBlock.type === 'text') userBlock.text = 'HACKED' }).toThrow(TypeError)
     const toolBlock = messages[1]!.content[0]!
-    if (toolBlock.type === 'tool-result') {
-      toolBlock.content.push({ type: 'text', text: 'injected' })
-    }
-    messages[0]!.content.push({ type: 'text', text: 'extra' })
+    expect(() => {
+      if (toolBlock.type === 'tool-result') toolBlock.content.push({ type: 'text', text: 'injected' })
+    }).toThrow(TypeError)
+    expect(() => { messages[0]!.content.push({ type: 'text', text: 'extra' }) }).toThrow(TypeError)
+    // The returned ARRAY is the caller's own snapshot, though — reordering it
+    // is the caller's business and never reaches the cache or the log.
+    messages.reverse()
 
     // The log is unchanged: deep-equal to the snapshot taken before mutation.
     expect(session.events).toEqual(before)
-    // And a fresh derivation still reflects the original content.
+    // And a fresh derivation still reflects the original content and order.
     expect(session.deriveMessages()[0]!.content).toEqual([{ type: 'text', text: 'original' }])
   })
 
diff --git a/packages/core/session/tests/surface.spec.ts b/packages/core/session/tests/surface.spec.ts
index 6a37e6fcab..257828e466 100644
--- a/packages/core/session/tests/surface.spec.ts
+++ b/packages/core/session/tests/surface.spec.ts
@@ -334,3 +334,26 @@ describe('surface type guards', () => {
     expect(isSurfaceEvent(markerless)).toBe(false)
   })
 })
+
+describe('SurfaceManager.replaceGeneration', () => {
+  it('folds the pending log delta on access and counts replaces and invalidations', () => {
+    const s = new Session(SessionId('gen'))
+    s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    s.append('user/message', { content: [{ type: 'text', text: 'one' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+    s.append('user/message', { content: [{ type: 'text', text: 'two' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+    // Read the generation FIRST — before nodes — so the getter itself folds
+    // the pending delta rather than piggybacking on a nodes read.
+    expect(s.surface.replaceGeneration).toBe(0)
+
+    const nodes = s.surface.nodes
+    s.append('context/message', {
+      content: [{ type: 'text', text: 'summary' }], source: { kind: 'plugin', plugin: 'compact' },
+    }, { surfaceOp: { op: 'replace', start: nodes[0]!.seq, end: nodes[1]!.seq }, sourceEventSeqs: [nodes[0]!.seq, nodes[1]!.seq] })
+    expect(s.surface.replaceGeneration).toBe(1)
+
+    // invalidate() is a rewrite too: the generation moves forward (and the
+    // refold re-counts the replace), never backwards.
+    s.surface.invalidate()
+    expect(s.surface.replaceGeneration).toBeGreaterThan(1)
+  })
+})
diff --git a/packages/core/skill/README.md b/packages/core/skill/README.md
index 2d92fd8354..71b497485a 100644
--- a/packages/core/skill/README.md
+++ b/packages/core/skill/README.md
@@ -47,7 +47,7 @@ Skills can be single-level directory bundles (`<name>/SKILL.md`) or flat Markdow
 
 ## Prompt Integration
 
-The service listens on `agent/request` and appends a short `## Skills` listing to the request system prompt for the calling agent's cwd. The listing contains only stable routing metadata (`name`, `source`, `description`, and optional `whenToUse`), not skill bodies or local absolute paths. `description` and `whenToUse` are whitespace-normalized and capped in the listing so one pathological skill cannot bloat every model request. Models load full instructions through the `skill` tool.
+The service listens on `system-prompt/assemble` and appends a short `## Skills` section to the calling agent's assembled system prompt. The listing contains only stable routing metadata (`name`, `source`, `description`, and optional `whenToUse`), not skill bodies or local absolute paths. `description` and `whenToUse` are whitespace-normalized and capped in the listing so one pathological skill cannot bloat every model request. Models load full instructions through the `skill` tool.
 
 ## System Skills
 
diff --git a/packages/core/skill/package.json b/packages/core/skill/package.json
index efa1646e14..fade69a580 100644
--- a/packages/core/skill/package.json
+++ b/packages/core/skill/package.json
@@ -25,6 +25,7 @@
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-fs": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "cordis": "^4.0.0-rc.6"
   },
   "dependencies": {
@@ -35,6 +36,7 @@
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-fs": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-system-prompt": "workspace:^",
     "cordis": "^4.0.0-rc.6"
   }
 }
diff --git a/packages/core/skill/src/index.ts b/packages/core/skill/src/index.ts
index cad8bdd423..eeca83b852 100644
--- a/packages/core/skill/src/index.ts
+++ b/packages/core/skill/src/index.ts
@@ -16,12 +16,13 @@ import z from 'schemastery'
 import type Schema from 'schemastery'
 import { parse as parseYaml } from 'yaml'
 import type { FileSystem, FsDirEntry, FsTarget } from '@deepseek-ai/dsh-fs'
-import type { GenerateOptions } from '@deepseek-ai/dsh-llm'
+import type {} from '@deepseek-ai/dsh-system-prompt'
 import type {} from '@deepseek-ai/dsh-agent'
 
 const SKILL_NAME = /^[a-z0-9]+(?:-[a-z0-9]+)*$/
 const DEFAULT_PROMPT_FIELD_LENGTH = 500
 const DEFAULT_COLLECT_CACHE_ENTRIES = 128
+const SKILL_PROMPT_SECTION_ORDER = 1000
 
 /** Return whether a string is a valid kebab-case skill name. */
 export function isSkillName(name: string): boolean {
@@ -168,10 +169,18 @@ export class SkillService extends Service {
       })
     }
 
-    ctx.on('agent/request', async (agent, _turn, _step, _request, next) => {
-      const listing = await this.renderModelListing({ cwd: agent.session.header.cwd })
+    ctx.on('system-prompt/assemble', async (_assembly, context, next) => {
       const result = await next()
-      if (listing.length > 0) appendSystem(result, listing)
+      const agent = context.agent
+      if (agent === undefined) return result
+      const listing = await this.renderModelListing({ cwd: agent.session.header.cwd })
+      if (listing.length > 0) {
+        result.sections.push({
+          name: 'skills:available',
+          order: SKILL_PROMPT_SECTION_ORDER,
+          text: listing,
+        })
+      }
       return result
     })
   }
@@ -669,8 +678,4 @@ function errorMessage(error: unknown): string {
   return String(error)
 }
 
-function appendSystem(request: GenerateOptions, text: string): void {
-  request.system = [request.system ?? '', text].filter(part => part.length > 0).join('\n\n')
-}
-
 export default SkillService
diff --git a/packages/core/skill/tests/skill.spec.ts b/packages/core/skill/tests/skill.spec.ts
index eab5cad5a2..fd04406000 100644
--- a/packages/core/skill/tests/skill.spec.ts
+++ b/packages/core/skill/tests/skill.spec.ts
@@ -5,6 +5,7 @@ import { tmpdir } from 'node:os'
 import { Context } from 'cordis'
 import SkillService from '@deepseek-ai/dsh-skill'
 import { FileSystem, FsVersion, type FsDirEntry, type FsEditOutcome, type FsEditRequest, type FsInfo, type FsTarget, type FsWriteOutcome } from '@deepseek-ai/dsh-fs'
+import SystemPrompt, { renderPrompt } from '@deepseek-ai/dsh-system-prompt'
 
 async function tempDir(name: string): Promise<string> {
   return await import('node:fs/promises').then(fs => fs.mkdtemp(join(tmpdir(), `dsh-${name}-`)))
@@ -21,6 +22,10 @@ async function writeFlatSkill(root: string, name: string, description: string, b
   await writeFile(join(root, `${name}.md`), `---\nname: ${name}\ndescription: ${description}\n---\n\n${body}\n`)
 }
 
+function agentForCwd(cwd: string): never {
+  return { session: { header: { cwd } } } as never
+}
+
 class TestFileSystem extends FileSystem {
   listDirCalls = 0
   failResolvePaths = new Set<string>()
@@ -350,14 +355,12 @@ describe('SkillService', () => {
   it('renders no model listing when no model-invocable skills exist', async () => {
     const home = await tempDir('skill-empty-listing')
     const ctx = new Context()
+    await ctx.plugin(SystemPrompt, { persona: 'base' })
     await ctx.plugin(SkillService, { dshHome: join(home, '.dsh'), agentsHome: join(home, '.agents'), installSystemSkills: false })
 
     expect(await ctx.skills.renderModelListing()).toBe('')
-    const request = { model: 'm', messages: [], system: 'base' }
-    const result = await ctx.waterfall('agent/request', {
-      session: { header: { cwd: home } },
-    } as never, 1, 1, request, () => Promise.resolve(request))
-    expect(result.system).toBe('base')
+    expect(renderPrompt(await ctx.systemPrompt.assemble({ agent: agentForCwd(home) }))).not.toContain('## Skills')
+    expect(renderPrompt(await ctx.systemPrompt.assemble())).not.toContain('## Skills')
   })
 
   it('supports default home root resolution without installing system skills', async () => {
@@ -592,42 +595,33 @@ describe('SkillService', () => {
     expect((await ctx.skills.get('escaped-skill'))?.description).toBe('Use </available_skills><oops> safely')
   })
 
-  it('adds skill guidance through the agent/request waterfall without including bodies', async () => {
+  it('adds skill guidance through system prompt assembly without including bodies', async () => {
     const home = await tempDir('skill-guidance')
     await writeSkill(join(home, '.dsh/skills'), 'research-helper', 'Research helper', 'Long body that must not be listed.')
 
     const ctx = new Context()
+    await ctx.plugin(SystemPrompt, { persona: 'base' })
     await ctx.plugin(SkillService, { dshHome: join(home, '.dsh'), agentsHome: join(home, '.agents'), installSystemSkills: false })
 
-    const request = await ctx.waterfall('agent/request', {
-      session: { header: { cwd: home } },
-    } as never, 1, 1, { model: 'm', messages: [], system: 'base' }, () => Promise.resolve({ model: 'm', messages: [], system: 'base' }))
+    const prompt = renderPrompt(await ctx.systemPrompt.assemble({ agent: agentForCwd(home) }))
 
-    expect(request.system ?? '').toContain('## Skills\n')
-    expect(request.system ?? '').toContain('research-helper')
-    expect(request.system ?? '').toContain('source="project-dsh"')
-    expect(request.system ?? '').not.toContain(home)
-    expect(request.system ?? '').not.toContain('Long body')
-    expect((request.system ?? '').match(/## Skills/g)).toHaveLength(1)
-
-    const sameObject = { model: 'm', messages: [], system: 'base' }
-    const sameObjectResult = await ctx.waterfall('agent/request', {
-      session: { header: { cwd: home } },
-    } as never, 1, 1, sameObject, () => Promise.resolve(sameObject))
-    expect(sameObjectResult.system).toContain('## Skills')
-
-    const requestWithoutBase = await ctx.waterfall('agent/request', {
-      session: { header: { cwd: home } },
-    } as never, 1, 1, { model: 'm', messages: [] }, () => Promise.resolve({ model: 'm', messages: [] }))
-    expect(requestWithoutBase.system).toContain('## Skills')
+    expect(prompt).toContain('base')
+    expect(prompt).toContain('## Skills\n')
+    expect(prompt).toContain('research-helper')
+    expect(prompt).toContain('source="project-dsh"')
+    expect(prompt).not.toContain(home)
+    expect(prompt).not.toContain('Long body')
+    expect(prompt.match(/## Skills/g)).toHaveLength(1)
 
     const copyCtx = new Context()
+    await copyCtx.plugin(SystemPrompt, { persona: 'base' })
     await copyCtx.plugin(SkillService, { dshHome: join(home, '.dsh'), agentsHome: join(home, '.agents'), installSystemSkills: false })
-    copyCtx.on('agent/request', async (_agent, _turn, _step, requestToCopy) => ({ ...requestToCopy }))
-    const copiedRequest = await copyCtx.waterfall('agent/request', {
-      session: { header: { cwd: home } },
-    } as never, 1, 1, { model: 'm', messages: [], system: 'base' }, () => Promise.resolve({ model: 'm', messages: [], system: 'base' }))
-    expect((copiedRequest.system ?? '').match(/## Skills/g)).toHaveLength(1)
+    copyCtx.on('system-prompt/assemble', async (_assembly, _context, next) => {
+      const result = await next()
+      return { ...result, sections: [...result.sections] }
+    })
+    const copiedPrompt = renderPrompt(await copyCtx.systemPrompt.assemble({ agent: agentForCwd(home) }))
+    expect(copiedPrompt.match(/## Skills/g)).toHaveLength(1)
   })
 
   it('cleans up runtime registered skills when the contributing fiber is disposed', async () => {
diff --git a/packages/llm/llm/README.md b/packages/llm/llm/README.md
index ab5fab49be..42694ba5ea 100644
--- a/packages/llm/llm/README.md
+++ b/packages/llm/llm/README.md
@@ -29,6 +29,10 @@ Messages are arrays of typed content blocks: `text`, `reasoning`, `tool-call`, `
 
 Streaming is a raw chunk protocol (`block-start`, `text-delta`, `reasoning-delta`, `tool-call-delta`, `block-end`, `usage`, `finish`). `BlockAssembler` is the single shared implementation that assembles chunks into blocks/messages.
 
+### Call configuration (`call-config.ts`)
+
+`LlmCallConfig` is the model + sampling scalars of one conversation's requests (`model`, `temperature`, `maxTokens`, `stop` — each mapping 1:1 onto the same-named `GenerateOptions` field). It is per-conversation state recorded in the session log as part of the request header (see the dsh-session `request/header` events), never a silently-adjustable per-call knob: the `agent/request` waterfall proposes a replacement and the loop logs a real change. `callConfigEquals(a, b)` is the field-wise real-change detector; `deepFreeze(value)` is the ownership helper the loop applies to every built request before dispatch (`llm/stream` listeners and adapters read, never rewrite).
+
 ### App attribution (`attribution.ts`)
 
 Every product adapter must identify the application on every provider HTTP request - attribution is part of the adapter contract, not an adapter-local nicety. `attributionHeaders(identity?)` builds the standard `User-Agent` header (`product/version (+url)`, from `userAgent()`) for every request. The default `APP_IDENTITY` carries only static public product facts (its version is read from this package's manifest); a white-label deployment passes its own `AppIdentity`, and omission falls back to the default - nothing can suppress attribution. OpenRouter-specific app attribution headers are intentionally not supported by this contract. An adapter proves compliance with a wire-level test: a mock server asserting the received header (or, for a library-backed adapter, that the library's header hook delivers the same value). Policy and rationale: [Mandatory `User-Agent` attribution](../../../docs/rfc/implemented/architecture/2026-06-21-mandatory-app-attribution-headers.md).
diff --git a/packages/llm/llm/src/call-config.ts b/packages/llm/llm/src/call-config.ts
new file mode 100644
index 0000000000..53cb157214
--- /dev/null
+++ b/packages/llm/llm/src/call-config.ts
@@ -0,0 +1,69 @@
+/**
+ * The call configuration of a conversation and its comparison/freeze
+ * utilities. `LlmCallConfig` is the non-content third of the request header
+ * (see `EpochHeader` in dsh-session): everything about a request besides its
+ * message content that can undermine provider KV-cache reuse — `model`
+ * selects the cache namespace outright, and the sampling scalars are treated
+ * the same way out of caution. It is per-conversation state recorded in the
+ * session log (the reconstructability RFC), never a silently-drifting
+ * per-call knob: the `agent/request` waterfall proposes a replacement, and
+ * the loop logs a real change as a `request/header-delta` event.
+ *
+ * @module dsh-llm/call-config
+ */
+
+/**
+ * Model + sampling scalars of one conversation's requests. Every field maps
+ * 1:1 onto the same-named `GenerateOptions` field; the loop builds requests
+ * from the logged header rather than accepting these per call.
+ */
+export interface LlmCallConfig {
+  model: string
+  temperature?: number
+  maxTokens?: number
+  stop?: string[]
+}
+
+/**
+ * Field-wise equality over {@link LlmCallConfig} — the comparison a caller
+ * runs to decide whether a proposed configuration is a real change (worth a
+ * logged header delta) or the held one restated.
+ * @param a - one configuration.
+ * @param b - the other.
+ * @returns whether every field (including the `stop` list, element-wise) matches.
+ */
+export function callConfigEquals(a: LlmCallConfig, b: LlmCallConfig): boolean {
+  if (a.model !== b.model || a.temperature !== b.temperature || a.maxTokens !== b.maxTokens) return false
+  if (a.stop === undefined || b.stop === undefined) return a.stop === b.stop
+  return a.stop.length === b.stop.length && a.stop.every((s, i) => s === b.stop?.[i])
+}
+
+/**
+ * Deep-freeze a value in place so any later mutation throws (ESM code runs in
+ * strict mode), and return it. The loop freezes every request it builds
+ * before dispatch — `llm/stream` listeners and adapters read the request,
+ * never rewrite it, so the wire bytes cannot silently desync from what the
+ * session log reconstructs. Guards against cycles with a WeakSet: loop-built
+ * requests hold `structuredClone`d JSON-validated session data, but the
+ * helper accepts arbitrarily constructed values. One exemption: an
+ * `AbortSignal` is never entered or frozen — it is the request's live
+ * cancellation channel, and freezing one breaks `AbortController.abort()`
+ * outright (Node stores the aborted flag as an own property of the signal).
+ * @param value - the value to freeze in place.
+ * @returns the same value, frozen.
+ */
+export function deepFreeze<T>(value: T): T {
+  const seen = new WeakSet<object>()
+  const walk = (node: unknown): void => {
+    if (node === null || typeof node !== 'object') return
+    if (node instanceof AbortSignal) return
+    if (seen.has(node)) return
+    seen.add(node)
+    Object.freeze(node)
+    for (const key of Object.keys(node)) {
+      walk((node as Record<string, unknown>)[key])
+    }
+  }
+  walk(value)
+  return value
+}
diff --git a/packages/llm/llm/src/index.ts b/packages/llm/llm/src/index.ts
index 220bb60062..0bab45e1bb 100644
--- a/packages/llm/llm/src/index.ts
+++ b/packages/llm/llm/src/index.ts
@@ -16,6 +16,8 @@ export * from './never.ts'
 export * from './error.ts'
 export * from './types.ts'
 export { BlockAssembler } from './assembler.ts'
+export { callConfigEquals, deepFreeze } from './call-config.ts'
+export type { LlmCallConfig } from './call-config.ts'
 
 declare module 'cordis' {
   interface Context {
@@ -24,10 +26,14 @@ declare module 'cordis' {
 
   interface Events {
     /**
-     * Waterfall around every streaming model call (retry, caching, routing).
+     * Waterfall around every streaming model call (retry, replay, routing).
      * Bound to the {@link LlmService}; call `next()` to reach the resolved
      * adapter's stream, or yield your own chunks to short-circuit.
-     * @param options - the full request; listeners may rewrite it before delegating.
+     * @param options - the full request. A LOOP-built request arrives
+     *   deep-frozen (mutation throws): its content is a pure function of the
+     *   session log (the reconstructability RFC), so listeners read it, never
+     *   rewrite it. A hand-built one-shot (compaction summarize) is the
+     *   caller's own object and stays mutable here.
      * @mode waterfall
      */
     'llm/stream'(this: LlmService, options: GenerateOptions, next: () => AsyncIterable<StreamChunk>): AsyncIterable<StreamChunk>
diff --git a/packages/llm/llm/tests/call-config.spec.ts b/packages/llm/llm/tests/call-config.spec.ts
new file mode 100644
index 0000000000..65ff7d7d34
--- /dev/null
+++ b/packages/llm/llm/tests/call-config.spec.ts
@@ -0,0 +1,56 @@
+/**
+ * call-config unit tests: field-wise LlmCallConfig equality (the real-change
+ * detector behind logged header deltas) and the deepFreeze ownership helper
+ * the loop applies to every built request.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { callConfigEquals, deepFreeze } from '../src/call-config.ts'
+
+describe('callConfigEquals', () => {
+  it('compares every field, including the stop list element-wise', () => {
+    expect(callConfigEquals({ model: 'm' }, { model: 'm' })).toBe(true)
+    expect(callConfigEquals({ model: 'm' }, { model: 'x' })).toBe(false)
+    expect(callConfigEquals({ model: 'm', temperature: 0.5 }, { model: 'm' })).toBe(false)
+    expect(callConfigEquals({ model: 'm', maxTokens: 1 }, { model: 'm', maxTokens: 2 })).toBe(false)
+    expect(callConfigEquals({ model: 'm', stop: ['a'] }, { model: 'm' })).toBe(false)
+    expect(callConfigEquals({ model: 'm', stop: ['a'] }, { model: 'm', stop: ['a', 'b'] })).toBe(false)
+    expect(callConfigEquals({ model: 'm', stop: ['a'] }, { model: 'm', stop: ['b'] })).toBe(false)
+    expect(callConfigEquals({ model: 'm', stop: ['a', 'b'] }, { model: 'm', stop: ['a', 'b'] })).toBe(true)
+  })
+})
+
+describe('deepFreeze', () => {
+  it('freezes nested structure in place and returns the same reference', () => {
+    const value = { a: { b: [1, { c: 'x' }] } }
+    const frozen = deepFreeze(value)
+    expect(frozen).toBe(value)
+    expect(Object.isFrozen(value)).toBe(true)
+    expect(Object.isFrozen(value.a)).toBe(true)
+    expect(Object.isFrozen(value.a.b)).toBe(true)
+    expect(Object.isFrozen(value.a.b[1])).toBe(true)
+    // ESM runs in strict mode: mutation throws rather than silently failing.
+    expect(() => { (value.a.b[1] as { c: string }).c = 'y' }).toThrow(TypeError)
+  })
+
+  it('never freezes an AbortSignal: the live cancellation channel keeps working', () => {
+    const controller = new AbortController()
+    const request = deepFreeze({ model: 'm', signal: controller.signal })
+    expect(Object.isFrozen(request)).toBe(true)
+    expect(Object.isFrozen(controller.signal)).toBe(false)
+    let fired = false
+    controller.signal.addEventListener('abort', () => { fired = true }, { once: true })
+    controller.abort('stop')
+    expect(fired).toBe(true)
+    expect(controller.signal.aborted).toBe(true)
+  })
+
+  it('passes primitives through and terminates on cycles', () => {
+    expect(deepFreeze(42)).toBe(42)
+    expect(deepFreeze(null)).toBeNull()
+    const cyclic = { self: undefined as unknown }
+    cyclic.self = cyclic
+    deepFreeze(cyclic)
+    expect(Object.isFrozen(cyclic)).toBe(true)
+  })
+})
diff --git a/packages/support/invariants/README.md b/packages/support/invariants/README.md
index b26170d48e..94c2682f9d 100644
--- a/packages/support/invariants/README.md
+++ b/packages/support/invariants/README.md
@@ -40,6 +40,10 @@ Agent status (per agent):
 
 - **legal transitions only** — `idle↔running` and `(idle|running)→disposed`. A no-op transition (`setStatus` dedups, so it never fires) and leaving the terminal `disposed` state are violations.
 
+Model requests (on `llm/stream`):
+
+- **a loop-built request is exactly what the log reconstructs** — a frozen request with a live `sessionId` (the loop-built marker; hand-built one-shots like compaction's summarize are unfrozen and skipped) must carry frozen `messages` deep-equal to the derivation over the log prefix strictly before the in-flight step's `step/start` (rebuilt through a FRESH `Session`, so the live cache cannot vouch for itself — and boundary-correct: content logged after `step/start` legitimately belongs to the next request), and every non-content field must equal the fold of the log's `request/header*` events (see [the reconstructability RFC](../../../docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md)). Registered with `prepend: true` so a short-circuiting `llm/stream` listener (the replay adapter) cannot silence it; prepend orders it against append-registered listeners only — correctness rests on the seq-bounded rebuild, never listener timing.
+
 On any violation it throws `InvariantError` (`code: 'INVARIANT'`).
 
 ## Why runtime, not deep-readonly types
diff --git a/packages/support/invariants/src/index.ts b/packages/support/invariants/src/index.ts
index 08d4365f4b..f35fbafa1d 100644
--- a/packages/support/invariants/src/index.ts
+++ b/packages/support/invariants/src/index.ts
@@ -21,9 +21,10 @@
 
 import type { Context } from 'cordis'
 import { HarnessError } from '@deepseek-ai/dsh-llm'
-import type { CallId } from '@deepseek-ai/dsh-llm'
+import type { CallId, GenerateOptions } from '@deepseek-ai/dsh-llm'
 import type { Agent, AgentStatus } from '@deepseek-ai/dsh-agent'
-import type { Session, SessionEvent, SurfaceEventType } from '@deepseek-ai/dsh-session'
+import { Session, SessionId, foldRequestHeader } from '@deepseek-ai/dsh-session'
+import type { SessionEvent, SurfaceEventType } from '@deepseek-ai/dsh-session'
 
 export const name = 'invariants'
 export const inject = ['sessions']
@@ -360,4 +361,74 @@ export function apply(ctx: Context, config: Config = {}): void {
     checkTransition(lastStatus.get(agent), status)
     lastStatus.set(agent, status)
   })
+
+  // Request-reconstruction cross-check (the reconstructability RFC): a
+  // loop-built request — frozen envelope + live sessionId is the marker; a
+  // hand-built one-shot (compaction summarize) is unfrozen and skipped — must
+  // be EXACTLY what the session log reconstructs:
+  //
+  // - messages: the derivation over the log prefix strictly before the
+  //   in-flight step's `step/start` (the reconstruction boundary). Compared
+  //   against a FRESH Session built over that prefix — the same projection
+  //   code with zero shared state, so the live cache under test cannot vouch
+  //   for itself. Boundary-correct by construction: content appended after
+  //   the boundary (an `agent/request`-window inject) is legitimately absent
+  //   from this request, and a current-surface comparison would false-fire.
+  // - header: every non-content field must equal the fold of the log's
+  //   `request/header*` events — the loop logs the header event BEFORE
+  //   dispatch, so the fold already covers this request.
+  //
+  // Registered with `prepend: true` so a short-circuiting llm/stream listener
+  // (the replay adapter returns its chunks without calling next()) cannot
+  // silence the check by registering first. Prepend beats APPEND-registered
+  // listeners only — two prepended listeners have no defined mutual order
+  // (cordis unshift) — which is fine: correctness rests on the seq-bounded
+  // fold below, never on listener timing.
+  ctx.on('llm/stream', (options: GenerateOptions, next) => {
+    if (options.sessionId === undefined || !Object.isFrozen(options)) return next()
+    // GenerateOptions types sessionId as Branded<'SessionId'>, which IS
+    // SessionId (dsh-llm cannot import it without a cycle) — no cast needed.
+    const session = ctx.sessions.get(options.sessionId)
+    if (!session) return next()
+    if (!Object.isFrozen(options.messages)) {
+      throw new InvariantError('a loop-built request must carry a frozen messages array')
+    }
+
+    const events = session.events
+    // seq === index (checked above), so the last step/start's seq bounds the
+    // prefix directly. The in-flight step's step/start is necessarily the
+    // last one: the loop cannot open another step while this call streams.
+    let boundary = -1
+    for (let i = events.length - 1; i >= 0; i -= 1) {
+      if (events[i]?.type === 'step/start') {
+        boundary = i
+        break
+      }
+    }
+    if (boundary === -1) {
+      throw new InvariantError('a loop-built request with no step/start in its session log')
+    }
+    const rebuilt = new Session(SessionId(`${String(session.id)}-invariant-rebuild`), structuredClone(events.slice(0, boundary)))
+    // JSON equality is sound here: both sides are structuredClones produced by
+    // the same projection code path, so key insertion order matches when the
+    // values do.
+    if (JSON.stringify(options.messages) !== JSON.stringify(rebuilt.deriveMessages())) {
+      throw new InvariantError(`llm request for session "${String(session.id)}" diverges from the boundary derivation (log-reconstruction desync)`)
+    }
+
+    const header = foldRequestHeader(events)
+    if (header === undefined) {
+      throw new InvariantError('a loop-built request with no request/header event in its session log')
+    }
+    const headerMatches = options.model === header.config.model
+      && options.system === header.system
+      && options.temperature === header.config.temperature
+      && options.maxTokens === header.config.maxTokens
+      && JSON.stringify(options.stop) === JSON.stringify(header.config.stop)
+      && JSON.stringify(options.tools ?? []) === JSON.stringify(header.tools ?? [])
+    if (!headerMatches) {
+      throw new InvariantError(`llm request for session "${String(session.id)}" diverges from the folded request header`)
+    }
+    return next()
+  }, { prepend: true })
 }
diff --git a/packages/support/invariants/tests/invariants.spec.ts b/packages/support/invariants/tests/invariants.spec.ts
index d7e95c1103..489cfb9817 100644
--- a/packages/support/invariants/tests/invariants.spec.ts
+++ b/packages/support/invariants/tests/invariants.spec.ts
@@ -670,3 +670,113 @@ describe('surface invariants', () => {
       .toThrow(/cannot carry surfaceOp/)
   })
 })
+
+describe('request-reconstruction cross-check (llm/stream)', () => {
+  /** Session with a boundary: one derivable user message, an open step, and the header event the loop would have logged. */
+  async function requestSetup() {
+    const { ctx } = await setup({ freeze: false })
+    const session = ctx.sessions.create(SessionId('req-check'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+    const boundary = session.deriveMessages()
+    session.append('step/start', { turn: 1, step: 1 })
+    session.append('request/header', { header: { config: { model: 'm' } }, reason: 'initial' })
+    return { ctx, session, boundary }
+  }
+
+  /** Dispatch the llm/stream waterfall with a stub core, collecting the check's verdict. */
+  function dispatch(ctx: Context, options: unknown): void {
+    // The invariants listener runs synchronously at dispatch time (its checks
+    // precede next()); the stub core just yields nothing.
+    void ctx.waterfall('llm/stream', options as never, () => (async function* () {})() as never)
+  }
+
+  it('passes a frozen request that equals the boundary derivation + the folded header', async () => {
+    const { ctx, session, boundary } = await requestSetup()
+    const options = Object.freeze({ model: 'm', messages: Object.freeze(boundary), sessionId: session.id })
+    expect(() => { dispatch(ctx, options) }).not.toThrow()
+  })
+
+  it('is boundary-correct: content logged after step/start is legitimately absent from this request', async () => {
+    const { ctx, session, boundary } = await requestSetup()
+    // An agent/request-window inject: lands in the log after the boundary,
+    // belongs to the NEXT request. A current-surface comparison would
+    // false-fire here; the seq-bounded rebuild must not.
+    session.append('context/message', { content: [{ type: 'text', text: '[late]' }], source: { kind: 'plugin', plugin: 'x' } }, { surfaceOp: 'append' })
+    const options = Object.freeze({ model: 'm', messages: Object.freeze(boundary), sessionId: session.id })
+    expect(() => { dispatch(ctx, options) }).not.toThrow()
+  })
+
+  it('rejects a frozen request whose messages diverge from the boundary derivation', async () => {
+    const { ctx, session, boundary } = await requestSetup()
+    const messages = [...boundary, { role: 'user', content: [{ type: 'text', text: 'phantom' }] }]
+    const options = Object.freeze({ model: 'm', messages: Object.freeze(messages), sessionId: session.id })
+    expect(() => { dispatch(ctx, options) }).toThrow(/diverges from the boundary derivation/)
+  })
+
+  it('rejects a frozen request whose fields diverge from the folded header', async () => {
+    const { ctx, session, boundary } = await requestSetup()
+    const options = Object.freeze({ model: 'other', messages: Object.freeze(boundary), sessionId: session.id })
+    expect(() => { dispatch(ctx, options) }).toThrow(/diverges from the folded request header/)
+  })
+
+  it('rejects a loop-built request with no header event or no step/start in its log', async () => {
+    const { ctx } = await setup({ freeze: false })
+    const session = ctx.sessions.create(SessionId('req-bare'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const bare = Object.freeze({ model: 'm', messages: Object.freeze([]), sessionId: session.id })
+    expect(() => { dispatch(ctx, bare) }).toThrow(/no step\/start/)
+
+    session.append('step/start', { turn: 1, step: 1 })
+    expect(() => { dispatch(ctx, bare) }).toThrow(/no request\/header event/)
+  })
+
+  it('rejects a frozen request carrying an unfrozen messages array', async () => {
+    const { ctx, session, boundary } = await requestSetup()
+    const options = Object.freeze({ model: 'm', messages: [...boundary], sessionId: session.id })
+    expect(() => { dispatch(ctx, options) }).toThrow(/frozen messages array/)
+  })
+
+  it('skips hand-built (unfrozen) requests — compaction summarize is out of scope', async () => {
+    const { ctx, session } = await requestSetup()
+    // Unfrozen envelope + arbitrary messages: a direct one-shot call.
+    const options = { model: 'summarizer', messages: [{ role: 'user', content: [{ type: 'text', text: 'summarize!' }] }], sessionId: session.id }
+    expect(() => { dispatch(ctx, options) }).not.toThrow()
+  })
+
+  it('skips requests without a sessionId or with an unknown session', async () => {
+    const { ctx } = await requestSetup()
+    expect(() => { dispatch(ctx, Object.freeze({ model: 'm', messages: Object.freeze([]) })) }).not.toThrow()
+    expect(() => { dispatch(ctx, Object.freeze({ model: 'm', messages: Object.freeze([]), sessionId: SessionId('ghost') })) }).not.toThrow()
+  })
+})
+
+describe('request cross-check ordering (prepend)', () => {
+  it('runs ahead of a short-circuiting llm/stream listener registered before it', async () => {
+    // The replay adapter returns its chunks WITHOUT calling next(), which
+    // would silence a later-registered check — snapshot compositions load
+    // replay before the app bundle that loads invariants. The check prepends,
+    // so it fires ahead of append-registered listeners regardless of load
+    // order. (Prepend orders it against APPENDED listeners only; correctness
+    // rests on the seq-bounded rebuild, not on listener timing.)
+    const ctx = new Context()
+    await ctx.plugin(SessionStore)
+    ctx.on('llm/stream', () => (async function* () {})() as never) // short-circuits, no next()
+    await ctx.plugin(Invariants, { freeze: false })
+
+    const session = ctx.sessions.create(SessionId('prepend-check'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
+    session.append('step/start', { turn: 1, step: 1 })
+    session.append('request/header', { header: { config: { model: 'm' } }, reason: 'initial' })
+
+    const divergent = Object.freeze({
+      model: 'm',
+      messages: Object.freeze([{ role: 'user', content: [{ type: 'text', text: 'phantom' }] }]),
+      sessionId: session.id,
+    })
+    expect(() => {
+      void ctx.waterfall('llm/stream', divergent as never, () => (async function* () {})() as never)
+    }).toThrow(/diverges from the boundary derivation/)
+  })
+})
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 67787fdece..bdc3dacdda 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -294,6 +294,9 @@ importers:
       '@deepseek-ai/dsh-llm':
         specifier: workspace:^
         version: link:../../llm/llm
+      '@deepseek-ai/dsh-system-prompt':
+        specifier: workspace:^
+        version: link:../system-prompt
       cordis:
         specifier: ^4.0.0-rc.6
         version: 4.0.0-rc.6(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.4)
diff --git a/scripts/gen-cordis-catalog.ts b/scripts/gen-cordis-catalog.ts
index acb6579272..4a7a417e02 100644
--- a/scripts/gen-cordis-catalog.ts
+++ b/scripts/gen-cordis-catalog.ts
@@ -83,6 +83,7 @@ const LINK_MAP: Record<string, string> = {
   Message: 'core.md',
   MessageSource: 'core.md',
   GenerateOptions: 'core.md',
+  LlmCallConfig: 'core.md',
   SessionEvent: 'core.md',
   StreamChunk: 'llm-streaming.md',
   TurnEndReason: 'session.md',
diff --git a/scripts/type-equiv.manifest.json b/scripts/type-equiv.manifest.json
index 13712d872c..fb81b6ec12 100644
--- a/scripts/type-equiv.manifest.json
+++ b/scripts/type-equiv.manifest.json
@@ -8,6 +8,7 @@
     { "doc": "docs/core-data-structures/core.md", "symbol": "FinishReasonMap", "source": "packages/llm/llm/src/types.ts" },
     { "doc": "docs/core-data-structures/core.md", "symbol": "GenerateOptions", "source": "packages/llm/llm/src/types.ts" },
     { "doc": "docs/core-data-structures/core.md", "symbol": "ToolSchema", "source": "packages/llm/llm/src/types.ts" },
+    { "doc": "docs/core-data-structures/core.md", "symbol": "LlmCallConfig", "source": "packages/llm/llm/src/call-config.ts" },
     { "doc": "docs/core-data-structures/core.md", "symbol": "SessionEvent", "source": "packages/core/session/src/types.ts" },
     { "doc": "docs/core-data-structures/core.md", "symbol": "Agent", "source": "packages/core/agent/src/types.ts" },
     { "doc": "docs/core-data-structures/core.md", "symbol": "HookContext", "source": "packages/core/agent/src/types.ts" },
@@ -21,6 +22,7 @@
     { "doc": "docs/core-data-structures/llm-streaming.md", "symbol": "AppIdentity", "source": "packages/llm/llm/src/attribution.ts" },
 
     { "doc": "docs/core-data-structures/session.md", "symbol": "SessionEventMap", "source": "packages/core/session/src/types.ts" },
+    { "doc": "docs/core-data-structures/session.md", "symbol": "EpochHeader", "source": "packages/core/session/src/types.ts" },
     { "doc": "docs/core-data-structures/session.md", "symbol": "TodoItem", "source": "packages/core/session/src/types.ts" },
     { "doc": "docs/core-data-structures/session.md", "symbol": "SessionEvent", "source": "packages/core/session/src/types.ts" },
     { "doc": "docs/core-data-structures/session.md", "symbol": "TurnTriggerMap", "source": "packages/core/session/src/types.ts" },