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deepseek-harness/docs/rfc/INDEX.md
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Tianyi Cui 8bb8ac8b3c docs(tasks): condense background task prose 
The background-task change repeated its lifecycle design across implemented RFCs, package READMEs, JSDoc, test commentary, and model-visible schemas. That repetition obscured the contracts that maintainers must preserve and added avoidable prompt tokens.

Rewrite the implemented RFCs around the current design, keep authorization, exact-owner cleanup, wait/abort ordering, producer quiescence, and teardown-failure guarantees at their owning surfaces, and remove peer surveys, review history, control-flow narration, and emphatic restatement.

Shorten the task and subagent schema wording, synchronize the bilingual tool cookbook, and regenerate the config, service, RFC, tool, and replay snapshot derivatives. Runtime behavior is unchanged; test edits update prose-only assertions and descriptions.
2026-07-15 21:08:58 +08:00

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# RFC index
Generated by `pnpm run gen-rfc-index` from the RFC tree — never edit by hand; `verify-rfc-classification` fails when this file is stale. The curated front door — layout, classification, when to write one, and the in-file format — is [README.md](README.md).
## Proposed
### Feature
| Title | First proposed |
|---|---|
| [Pre-tool input rewrite — a consistent design](proposed/feature/2026-06-30-pre-tool-input-rewrite.md) | 2026-06-30 |
| [Claude Code and Codex subagent backends (out-of-process delegation to external coding agents)](proposed/feature/2026-07-07-claude-code-and-codex-subagent-backends.md) | 2026-07-07 |
| [Interactive side sessions and merge-back](proposed/feature/2026-07-08-interactive-side-sessions.md) | 2026-07-08 |
| [SQLite FTS5 session search](proposed/feature/2026-07-10-sqlite-session-query-provider.md) | 2026-07-10 |
| [Stream workflow progress through tool calls](proposed/feature/2026-07-13-stream-workflow-progress-through-tool-calls.md) | 2026-07-13 |
### Simplification
| Title | First proposed |
|---|---|
| [Unify the agent id and the session id](proposed/simplification/2026-06-20-unify-agent-and-session-id.md) | 2026-06-20 |
| [Prune dead public and result surface](proposed/simplification/2026-07-04-prune-dead-core-spine-surface.md) | 2026-07-04 |
| [Simplify session-log representation](proposed/simplification/2026-07-12-simplify-session-log-representation.md) | 2026-07-12 |
### Architecture
| Title | First proposed |
|---|---|
| [Runtime schemas for the event vocabulary (Zod vs the merge-extensible-map pattern)](proposed/architecture/2026-06-16-typed-event-schemas.md) | 2026-06-16 |
### Process
| Title | First proposed |
|---|---|
| [API extractor reports](proposed/process/2026-06-11-api-extractor-reports.md) | 2026-06-11 |
| [Architectural conformance — dependency rules and the adapter kit](proposed/process/2026-06-11-architectural-conformance.md) | 2026-06-11 |
| [Supply chain checks and vendor drift verification](proposed/process/2026-06-11-supply-chain-and-vendor-drift.md) | 2026-06-11 |
| [Discover package inventories instead of maintaining static lists](proposed/process/2026-06-20-discover-package-inventory.md) | 2026-06-20 |
### Testing
| Title | First proposed |
|---|---|
| [Deterministic tests, the replay invariant fixture, and race stress](proposed/testing/2026-06-11-deterministic-and-stress-testing.md) | 2026-06-11 |
| [Mutation testing as the coverage counterweight](proposed/testing/2026-06-11-mutation-testing.md) | 2026-06-11 |
## Implemented
### Feature
| Title | First proposed |
|---|---|
| [Agent Client Protocol (ACP) support — drive the coding agent from external editors](implemented/feature/2026-06-14-acp-agent-client-protocol.md) | 2026-06-14 |
| [Multiplex concurrent ACP sessions over one connection](implemented/feature/2026-06-14-acp-multi-session.md) | 2026-06-14 |
| [Code Mode — the model writes TypeScript against the tool registry](implemented/feature/2026-06-15-code-mode.md) | 2026-06-15 |
| [Filesystem tool schemas — model-facing read/write/edit shapes](implemented/feature/2026-06-17-filesystem-tool-schemas.md) | 2026-06-17 |
| [Rich ACP bash rendering — the terminal card via the `_meta` convention](implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.md) | 2026-06-18 |
| [Compaction as a capability seam (abstract contract + basic backend)](implemented/feature/2026-06-18-compaction-capability-seam.md) | 2026-06-18 |
| [Subagent capability seam](implemented/feature/2026-06-21-subagent-capability-seam.md) | 2026-06-21 |
| [ACP subagent backend (out-of-process delegation)](implemented/feature/2026-06-22-acp-subagent-backend.md) | 2026-06-22 |
| [Ask-user question capability](implemented/feature/2026-06-25-ask-user-question.md) | 2026-06-25 |
| [The `todo_write` tool — model task list as event-sourced session state](implemented/feature/2026-06-29-todo-write-tool.md) | 2026-06-29 |
| [dsh-hooks-claude + dsh-hooks-codex — the Claude Code / Codex hook bridges](implemented/feature/2026-06-30-hook-bridges.md) | 2026-06-30 |
| [dsh-hook-protocol — the shared Claude Code / Codex hook wire-protocol core](implemented/feature/2026-06-30-hook-protocol-lib.md) | 2026-06-30 |
| [Interception seams — the typed-Decision surface a hook programs against](implemented/feature/2026-06-30-interception-seams.md) | 2026-06-30 |
| [SessionStore fork API](implemented/feature/2026-06-30-session-store-fork-api.md) | 2026-06-30 |
| [Subagent lifecycle enrichment — lastAssistantMessage (observe-only)](implemented/feature/2026-06-30-subagent-observe-enrich.md) | 2026-06-30 |
| [Dynamic workflows — a script-driven multi-agent orchestration seam](implemented/feature/2026-07-05-dynamic-workflows.md) | 2026-07-05 |
| [Skill system — progressive disclosure instructions for agents](implemented/feature/2026-07-05-skill-system.md) | 2026-07-05 |
| [The approval seam — one-shot permission decisions over a waterfall of answerers](implemented/feature/2026-07-06-approval-seam.md) | 2026-07-06 |
| [Explicit model-facing tool order](implemented/feature/2026-07-06-explicit-tool-order.md) | 2026-07-06 |
| [The subprocess sandbox — confinement seam, native runners, escalation, and per-session modes](implemented/feature/2026-07-06-sandbox.md) | 2026-07-06 |
| [MCP client plugin — connect to external MCP servers and bridge their tools](implemented/feature/2026-07-07-mcp-client-plugin.md) | 2026-07-07 |
| [The session prefix — request-only messages in front of the derived history](implemented/feature/2026-07-07-session-prefix.md) | 2026-07-07 |
| [Background subagent tasks](implemented/feature/2026-07-08-background-subagent-tasks.md) | 2026-07-08 |
| [Repeat-tool-call guard plugin](implemented/feature/2026-07-08-repeat-tool-guard.md) | 2026-07-08 |
| [The self-referential cordis toolset](implemented/feature/2026-07-08-self-referential-cordis-toolset.md) | 2026-07-08 |
| [Exact session query service](implemented/feature/2026-07-10-session-query-service.md) | 2026-07-10 |
| [Configure subagent persona, tool visibility, and depth](implemented/feature/2026-07-12-subagent-persona-tool-filter-and-depth.md) | 2026-07-12 |
| [Optional time-context plugin](implemented/feature/2026-07-14-time-context-plugin.md) | 2026-07-14 |
### Simplification
| Title | First proposed |
|---|---|
| [Drop the mutable session summary](implemented/simplification/2026-06-19-drop-mutable-session-summary.md) | 2026-06-19 |
| [Fold trace-only session facts into load-bearing events](implemented/simplification/2026-06-20-collapse-trace-only-session-events.md) | 2026-06-20 |
| [Drop the unconsumed `llm/adapter-change` event](implemented/simplification/2026-06-20-drop-unconsumed-llm-adapter-change-event.md) | 2026-06-20 |
| [Drop unconsumed assembled LLM convenience surfaces](implemented/simplification/2026-06-20-drop-unconsumed-llm-assembled-surfaces.md) | 2026-06-20 |
| [Prune dead methods from the persistence seam](implemented/simplification/2026-06-20-prune-dead-seam-methods.md) | 2026-06-20 |
| [Keep one public stop primitive](implemented/simplification/2026-06-20-public-agent-stop-surface.md) | 2026-06-20 |
| [Stop mirroring durable boundaries as agent events](implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.md) | 2026-06-20 |
| [Split the filesystem seam — provider text mutations plus the `dsh-fs-policy` plugin](implemented/simplification/2026-06-26-fsspec-style-fs-seam.md) | 2026-06-26 |
| [Stop mirroring the token stream as an agent event](implemented/simplification/2026-07-02-remove-stream-chunk-mirror.md) | 2026-07-02 |
| [Drop the `image` content block until a path can honor it](implemented/simplification/2026-07-04-drop-image-content-block.md) | 2026-07-04 |
| [Drop `GenerateOptions.prefill` and `ToolSchema.strict` — request knobs with no working end-to-end path](implemented/simplification/2026-07-04-drop-inert-request-knobs.md) | 2026-07-04 |
| [Drop the unconsumed web observation surface — the `providers-change` event and the status methods](implemented/simplification/2026-07-04-drop-unconsumed-web-observation-surface.md) | 2026-07-04 |
| [Fold the stdio UI helper into the stdio app](implemented/simplification/2026-07-04-fold-stdio-ui-helper.md) | 2026-07-04 |
| [Prune producer-less vocabulary variants (block cache hints, the `agent` message source, the `continuation` turn trigger)](implemented/simplification/2026-07-04-prune-producerless-vocabulary-variants.md) | 2026-07-04 |
| [Prune write-only fields and a dead routing knob from the fs seam](implemented/simplification/2026-07-04-prune-write-only-fs-surface.md) | 2026-07-04 |
| [Remove the `agent/steering` mirror emit](implemented/simplification/2026-07-04-remove-agent-steering-mirror.md) | 2026-07-04 |
| [Share the app bins' boot glue instead of maintaining twin copies](implemented/simplification/2026-07-04-share-app-bin-boot-glue.md) | 2026-07-04 |
| [Tighten the hook-protocol contract — dialect, discarded fields, double defaults, and lib-owned `hook/result` semantics](implemented/simplification/2026-07-04-tighten-hook-protocol-contract.md) | 2026-07-04 |
| [Trim unreachable ACP bridge surface — the branding knobs and the kind-sniffing fallback](implemented/simplification/2026-07-04-trim-acp-bridge-unreachable-surface.md) | 2026-07-04 |
| [Drop unconsumed skill provider events](implemented/simplification/2026-07-12-drop-unconsumed-skill-provider-events.md) | 2026-07-12 |
| [Prune unused web seam fields](implemented/simplification/2026-07-12-prune-unused-web-seam-fields.md) | 2026-07-12 |
### Architecture
| Title | First proposed |
|---|---|
| [Provider-neutral content-block vocabulary owned by dsh-llm](implemented/architecture/2026-06-11-content-block-vocabulary.md) | 2026-06-11 |
| [Custom typed tool-schema DSL instead of schemastery](implemented/architecture/2026-06-11-custom-schema-dsl.md) | 2026-06-11 |
| [Source-owned session immutability and dev-mode invariants](implemented/architecture/2026-06-11-dev-invariants-over-deep-readonly.md) | 2026-06-11 |
| [Event-sourced sessions with derived message history](implemented/architecture/2026-06-11-event-sourced-sessions.md) | 2026-06-11 |
| [Microkernel — extension via Cordis event taxonomy, one concrete loop](implemented/architecture/2026-06-11-microkernel-event-taxonomy.md) | 2026-06-11 |
| [Runtime arg validation at the model boundary](implemented/architecture/2026-06-11-runtime-arg-validation.md) | 2026-06-11 |
| [Structured error taxonomy](implemented/architecture/2026-06-11-structured-error-taxonomy.md) | 2026-06-11 |
| [Tool schemas are part of the system-prompt assembly](implemented/architecture/2026-06-11-tool-schemas-in-prompt-assembly.md) | 2026-06-11 |
| [Capability seams — interface / implementation / consumer split](implemented/architecture/2026-06-13-capability-seams.md) | 2026-06-13 |
| [Two LLM adapters as a design-verification twin](implemented/architecture/2026-06-13-twin-llm-adapters.md) | 2026-06-13 |
| [Session persistence as an abstract service over the existing `SessionEvent`](implemented/architecture/2026-06-14-session-persistence.md) | 2026-06-14 |
| [Every session event is enclosed in a turn](implemented/architecture/2026-06-15-turn-enclosure-invariant.md) | 2026-06-15 |
| [Filesystem capability seam — ctx.fs, local backend, and model-facing filesystem tools](implemented/architecture/2026-06-17-filesystem-capability-seam.md) | 2026-06-17 |
| [Agent lifecycle and ownership seams](implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.md) | 2026-06-18 |
| [Session surface — a linked list over the event log for LLM message derivation](implemented/architecture/2026-06-18-session-surface.md) | 2026-06-18 |
| [Shared persistence write coordinator](implemented/architecture/2026-06-18-shared-persistence-write-coordinator.md) | 2026-06-18 |
| [Branded IDs everywhere they belong](implemented/architecture/2026-06-20-branded-ids.md) | 2026-06-20 |
| [Extract example apps into packages](implemented/architecture/2026-06-20-extract-example-app-packages.md) | 2026-06-20 |
| [The background task runtime (`ctx.tasks`) and generic task control tools](implemented/architecture/2026-06-20-generic-long-running-tool-runtime.md) | 2026-06-20 |
| [Reorganize packages into a modular hierarchy](implemented/architecture/2026-06-20-package-hierarchy.md) | 2026-06-20 |
| [Mandatory `User-Agent` attribution for provider requests](implemented/architecture/2026-06-21-mandatory-app-attribution-headers.md) | 2026-06-21 |
| [Web capability seam - stable tools over multiple providers](implemented/architecture/2026-06-24-web-capability-seam.md) | 2026-06-24 |
| [Make `dsh-fs-policy` an event-gate plugin, not a method interface](implemented/architecture/2026-06-26-file-context-as-event-gate.md) | 2026-06-26 |
| [stdin + extra env on the bash seam](implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.md) | 2026-06-30 |
| [Event-domain semantics — session is the fact log, agent is the live surface](implemented/architecture/2026-06-30-event-domain-semantics.md) | 2026-06-30 |
| [Resolve filesystem paths against the caller's session cwd](implemented/architecture/2026-07-02-fs-per-session-cwd.md) | 2026-07-02 |
| [Result-time applied-hunk diffs for file mutations](implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md) | 2026-07-02 |
| [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 |
| [A shared timeout/deadline primitive, with hard-kill left to each capability](implemented/architecture/2026-07-06-timeout-deadline-library.md) | 2026-07-06 |
| [Tool-call timeout policy as a plugin](implemented/architecture/2026-07-07-tool-call-timeout-policy.md) | 2026-07-07 |
| [The agent is a registration scope](implemented/architecture/2026-07-08-agent-scope-contexts.md) | 2026-07-08 |
| [Single-file executable SDK runtime distribution (single-exe)](implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.md) | 2026-07-10 |
| [Agent-scope runtime design and correctness](implemented/architecture/2026-07-12-agent-scope-runtime-design.md) | 2026-07-12 |
### Process
| Title | First proposed |
|---|---|
| [Doc-sync enforcement](implemented/process/2026-06-11-doc-sync-enforcement.md) | 2026-06-11 |
| [Mechanical quality gates over prose guidelines](implemented/process/2026-06-11-quality-gates.md) | 2026-06-11 |
| [tsdown for JS bundling instead of dumble](implemented/process/2026-06-11-tsdown-over-dumble.md) | 2026-06-11 |
| [Vendor Cordis as source, not npm dependencies](implemented/process/2026-06-11-vendor-cordis-as-source.md) | 2026-06-11 |
| [pnpm as the package manager instead of Yarn 4](implemented/process/2026-06-16-pnpm-over-yarn.md) | 2026-06-16 |
| [TSC-first build and one tsconfig](implemented/process/2026-06-17-ts-build-config.md) | 2026-06-17 |
| [Markdown cross-link validity linting](implemented/process/2026-06-18-markdown-cross-link-lint.md) | 2026-06-18 |
| [Core-data-structures catalog and the `ts type-equiv` drift gate](implemented/process/2026-06-20-core-data-structures-catalog.md) | 2026-06-20 |
| [Generated cordis events + services catalog](implemented/process/2026-06-20-generated-cordis-catalog.md) | 2026-06-20 |
| [Classify RFCs by kind via path-encoded subdirectories](implemented/process/2026-06-20-rfc-classification.md) | 2026-06-20 |
| [Bilingual documentation via paired sibling files and a pairing gate](implemented/process/2026-07-02-bilingual-docs-and-pairing-gate.md) | 2026-07-02 |
| [Generated tool-schema catalog (boot-and-harvest)](implemented/process/2026-07-02-tool-schema-catalog.md) | 2026-07-02 |
| [Documentation graph index for maintainers and SDK users](implemented/process/2026-07-03-documentation-graph-atlas.md) | 2026-07-03 |
| [JSDoc completeness gate for the cordis surface](implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.md) | 2026-07-04 |
| [Documentation tiers, budgets, and the ceiling gate](implemented/process/2026-07-04-doc-tiers-and-budgets.md) | 2026-07-04 |
| [Generate the RFC index tables](implemented/process/2026-07-04-generate-rfc-index-tables.md) | 2026-07-04 |
| [Generated persistence log event catalog](implemented/process/2026-07-04-persistence-log-catalog.md) | 2026-07-04 |
| [One gated in-file format for RFCs](implemented/process/2026-07-05-uniform-rfc-format.md) | 2026-07-05 |
| [Export-surface JSDoc gate](implemented/process/2026-07-06-export-surface-jsdoc-gate.md) | 2026-07-06 |
| [Generated plugin config catalog](implemented/process/2026-07-06-generated-config-catalog.md) | 2026-07-06 |
| [Raise the Node LTS engine floor to 22.19](implemented/process/2026-07-06-node-engine-floor.md) | 2026-07-06 |
| [Parallel GitHub CI gates](implemented/process/2026-07-06-parallel-github-ci-gates.md) | 2026-07-06 |
| [Parallel pre-push gates](implemented/process/2026-07-06-parallel-pre-push-gates.md) | 2026-07-06 |
| [A gated Known-Limitations section in every package README](implemented/process/2026-07-10-readme-known-limitations-gate.md) | 2026-07-10 |
| [Package Model Experience contract](implemented/process/2026-07-12-package-model-experience-contract.md) | 2026-07-12 |
| [TypeScript Program-backed semantic gates](implemented/process/2026-07-14-typescript-program-backed-semantic-gates.md) | 2026-07-14 |
### Testing
| Title | First proposed |
|---|---|
| [Property-based testing for protocol-shaped code](implemented/testing/2026-06-11-property-based-testing.md) | 2026-06-11 |
| [ACP snapshot tests — record-once / replay-deterministic](implemented/testing/2026-06-19-acp-snapshot-tests.md) | 2026-06-19 |
| [Real-API e2e in CI against the external DeepSeek API](implemented/testing/2026-06-19-real-api-e2e-ci.md) | 2026-06-19 |
| [Use `session.jsonl` as the only snapshot session-log artifact](implemented/testing/2026-06-20-remove-redundant-snapshot-log-goldens.md) | 2026-06-20 |
| [Persist the seed boundary so fork-child replay routes correctly](implemented/testing/2026-06-22-fork-child-replay-seed-boundary.md) | 2026-06-22 |
| [Record fork and mixed spawn+fork snapshot scenarios](implemented/testing/2026-06-22-fork-snapshot-scenarios.md) | 2026-06-22 |
| [Per-session snapshot replay for nested agents](implemented/testing/2026-06-22-subagent-snapshot-replay.md) | 2026-06-22 |
| [Hook snapshot matrix — end-to-end goldens for both bridges](implemented/testing/2026-07-04-hook-snapshot-matrix.md) | 2026-07-04 |
| [Single-source the acp-agent replay config](implemented/testing/2026-07-04-single-source-acp-replay-config.md) | 2026-07-04 |
| [Pin request-header content in one snapshot scenario](implemented/testing/2026-07-06-pin-request-header-content-in-one-scenario.md) | 2026-07-06 |
| [Extract the ACP snapshot suite into a support package](implemented/testing/2026-07-08-shared-acp-snapshot-package.md) | 2026-07-08 |
## Rejected
### Simplification
| Title | First proposed |
|---|---|
| [Persist assembled assistant messages, not stream chunks](rejected/simplification/2026-06-20-assembled-assistant-messages-only.md) | 2026-06-20 |
| [Drop ACP session/load until resume has a product shape](rejected/simplification/2026-06-20-drop-acp-session-load.md) | 2026-06-20 |
| [Drop ACP terminal `_meta` rendering](rejected/simplification/2026-06-20-drop-acp-terminal-meta.md) | 2026-06-20 |
| [Drop bash full-output spill files](rejected/simplification/2026-06-20-drop-bash-output-spill-files.md) | 2026-06-20 |
| [Drop durable step boundary events](rejected/simplification/2026-06-20-drop-durable-step-boundaries.md) | 2026-06-20 |
| [Drop unused session lineage metadata](rejected/simplification/2026-06-20-drop-unused-session-lineage.md) | 2026-06-20 |
| [Fold the persistence interface into dsh-session](rejected/simplification/2026-06-20-fold-session-persistence-interface.md) | 2026-06-20 |
| [Collapse tool-owned UI presentation](rejected/simplification/2026-06-20-generic-tool-rendering.md) | 2026-06-20 |
| [Retire mid-turn steering](rejected/simplification/2026-06-20-retire-mid-turn-steering.md) | 2026-06-20 |
| [Return the ACP bridge to one live session per connection](rejected/simplification/2026-06-20-single-session-acp-bridge.md) | 2026-06-20 |
| [Truncate interrupted final turns on load](rejected/simplification/2026-06-20-truncate-interrupted-turns.md) | 2026-06-20 |
| [Prune the unimplemented subagent seam vocabulary](rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.md) | 2026-07-04 |
| [Collapse workflows to the exercised foreground core](rejected/simplification/2026-07-12-collapse-workflow-to-foreground-core.md) | 2026-07-12 |
| [Prune unused skill registry surface](rejected/simplification/2026-07-12-prune-unused-skill-registry-surface.md) | 2026-07-12 |
### Architecture
| Title | First proposed |
|---|---|
| [Deep-readonly public surfaces](rejected/architecture/2026-06-11-immutable-public-surfaces.md) | 2026-06-11 |
| [Make the shared example base providerless](rejected/architecture/2026-06-20-providerless-example-base.md) | 2026-06-20 |
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