<!-- Generated by scripts/gen-persistence-catalog.ts — do not edit by hand.
     Run `pnpm run gen-persistence-catalog` to regenerate. -->

# Persistence Log Event Catalog

Every event type that can appear in a session's durable event log: each member of the merge-extensible `SessionEventMap` — the owning vocabulary in `@deepseek-ai/dsh-session` plus every plugin declaration merge in this repo — with the payload it carries, its surface badge, and the declaration it comes from. It complements [session.md](core-data-structures/session.md) (the `SessionEvent` envelope, surface list, and `deriveMessages()` projection), [persistence.md](core-data-structures/persistence.md) (how the log is made durable), and the [cordis events catalog](cordis-catalog/events.md) (the live bus wiring — a log event is NOT a cordis event; it reaches listeners via the single `session/event` emit).

This file is GENERATED from source (`scripts/gen-persistence-catalog.ts`) and verified fresh by `pnpm run verify-persistence-catalog` (part of `doc-sync`) — do not edit it by hand. Payload blocks use a `ts persistence-catalog` fence (skipped by doc-typecheck, since a bare payload fragment is not standalone-compilable). Type names in a payload link to the page that documents them. See [the persistence-log-catalog RFC](rfc/implemented/process/2026-07-04-persistence-log-catalog.md).

The on-disk envelope around every payload is `SessionEvent` — `type`, monotonic `seq`, epoch-ms `time`, the `data` documented here, plus `surfaceOp`/`sourceEventSeqs` on **surface** events only ([envelope](core-data-structures/session.md#sessioneventt--one-log-entry)). **surface** marks a `SurfaceEventType` member: it produces an LLM message and declares how it joins the surface list. **log-only** marks everything else: durable, replayable record with no derived-history contribution. Every payload is JSON-serializable (enforced at `Session.append`), and the whole format is pinned at `SESSION_FORMAT_VERSION = 0` — pre-release, no compatibility implied ([the version stance](core-data-structures/persistence.md)). Scope: the packages in this repo; a downstream plugin can merge further event types, which are outside this catalog by construction.

## Events

### `approval/*`

#### `approval/asked` — log-only

An approval question was put to the answerer chain — log-only audit (like `hook/*`; NOT a surface event, carries no `surfaceOp`). `id` pairs it with the `approval/decided` that always follows; `toolName` is the tool the question is about, `callId` the exact tool call when the asker had one, `reason` the asker's human-readable explanation (e.g. a hook's permission-decision reason).

```ts persistence-catalog
'approval/asked': { id: ApprovalRequestId; toolName: string; callId?: CallId; reason?: string }
```

Types: [CallId](core-data-structures/core.md)

Source: [`packages/ui/user-approval/src/index.ts:45`](../packages/ui/user-approval/src/index.ts)

#### `approval/decided` — log-only

The outcome of a prior `approval/asked` (same `id`) — log-only audit. Exactly one per ask, appended when the outcome is known: a decision, a cancellation, or the fail-closed `'unavailable'`.

```ts persistence-catalog
'approval/decided': { id: ApprovalRequestId; outcome: ApprovalOutcome }
```

Source: [`packages/ui/user-approval/src/index.ts:56`](../packages/ui/user-approval/src/index.ts)

#### `approval/policy` — log-only

The session's approval policy was switched — log-only, durable, replayable, never in the model transcript (the model learns the policy from the prompt section and the narrator's notices). The LAST such event is the session's override (effectiveApprovalPolicy); who asked for it is derivable from position (an event after the log's last `request/header*` was a runtime switch by the user).

```ts persistence-catalog
'approval/policy': { policy: ApprovalPolicy }
```

Source: [`packages/ui/user-approval/src/index.ts:68`](../packages/ui/user-approval/src/index.ts)

### `assistant/*`

#### `assistant/chunk` — log-only

Raw stream chunk — token-level replay fidelity.

```ts persistence-catalog
'assistant/chunk': { turn: number; step: number; chunk: StreamChunk }
```

Types: [StreamChunk](core-data-structures/llm-streaming.md)

Source: [`packages/core/session/src/types.ts:242`](../packages/core/session/src/types.ts)

#### `assistant/message` — surface

Assembled assistant message for one step (derived history uses this). Carries the step's `usage` when the adapter reported token accounting, so the model output and its accounting travel together (there is no separate usage record). `usage` is absent when the adapter reported none.

```ts persistence-catalog
'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
```

Types: [ContentBlock](core-data-structures/core.md) · [TokenUsage](core-data-structures/llm-streaming.md)

Source: [`packages/core/session/src/types.ts:249`](../packages/core/session/src/types.ts)

### `compact/*`

#### `compact/end` — log-only

Marks the end of a compaction — log-only, releases the lock. `error` set if summarization failed.

```ts persistence-catalog
'compact/end': { turn: number; error?: string }
```

Source: [`packages/compact/compact/src/types.ts:38`](../packages/compact/compact/src/types.ts)

#### `compact/start` — log-only

Marks the start of a compaction — log-only, holds the lock until `compact/end`.

```ts persistence-catalog
'compact/start': { turn: number }
```

Source: [`packages/compact/compact/src/types.ts:15`](../packages/compact/compact/src/types.ts)

#### `compact/summary` — log-only

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; model: string; maxTokens?: number }
```

Types: [ContentBlock](core-data-structures/core.md)

Source: [`packages/compact/compact/src/types.ts:22`](../packages/compact/compact/src/types.ts)

### `context/*`

#### `context/message` — surface

In-session context injection (file-change notices, subdir AGENTS.md, skill content, cron notifications, …). Rendered into the derived history as tagged synthetic context — NOT a user prompt.

```ts persistence-catalog
'context/message': { content: ContentBlock[]; source: MessageSource }
```

Types: [ContentBlock](core-data-structures/core.md) · [MessageSource](core-data-structures/core.md)

Source: [`packages/core/session/src/types.ts:240`](../packages/core/session/src/types.ts)

### `hook/*`

#### `hook/invoked` — log-only

A hook command was invoked at a hook point — log-only provenance (like `compact/*`; NOT a SurfaceEventType, carries no `surfaceOp`). `dialect` is the bridge that ran it (`claude`/`codex`), `point` the hook point (`PreToolUse`, `Stop`, …), `matcher` the matcher-group pattern that selected it (absent for match-all), `handlerId` a stable id for the command (so an invoked/result pair correlates). `turn` is the open turn the invocation lives inside.

```ts persistence-catalog
'hook/invoked': { turn: number; point: string; dialect: HookDialect; matcher?: string; handlerId: string }
```

Source: [`packages/hooks/hook-protocol/src/types.ts:19`](../packages/hooks/hook-protocol/src/types.ts)

#### `hook/result` — log-only

Log-only outcome paired to `hook/invoked` by `handlerId`. Decision is the parsed permission result, `stop` for `continue:false`, or `pass`; exit code may be absent, stderr is bounded, and duration is wall-clock runtime.

```ts persistence-catalog
'hook/result': { turn: number; point: string; handlerId: string; decision: string; exitCode?: number; stderrSummary?: string; durationMs: number }
```

Source: [`packages/hooks/hook-protocol/src/types.ts:31`](../packages/hooks/hook-protocol/src/types.ts)

### `permission/*`

#### `permission/preset` — log-only

Records the selected preset as durable, log-only user intent. The knob events follow in the same turn and control execution; this event stays out of the model transcript and lets effectivePermissionPreset preserve a selection when bundles match.

```ts persistence-catalog
'permission/preset': { preset: string }
```

Source: [`packages/ui/permission/src/index.ts:36`](../packages/ui/permission/src/index.ts)

### `prompt/*`

#### `prompt/blocked` — log-only

Durable record of a prompt veto and its reason. It is log-only: the blocked prompt never enters the model-visible surface, including in a mixed batch.

```ts persistence-catalog
'prompt/blocked': { content: ContentBlock[]; source: MessageSource; reason: string }
```

Types: [ContentBlock](core-data-structures/core.md) · [MessageSource](core-data-structures/core.md)

Source: [`packages/core/session/src/types.ts:234`](../packages/core/session/src/types.ts)

### `request/*`

#### `request/header` — log-only

Full EpochHeader for the next request, appended inside its step before dispatch. It is log-only and anchors subsequent deltas.

```ts persistence-catalog
'request/header': { header: EpochHeader; reason: RequestHeaderReason }
```

Source: [`packages/core/session/src/types.ts:277`](../packages/core/session/src/types.ts)

#### `request/header-delta` — log-only

Log-only amendment to the folded EpochHeader. System and tools use their delta codecs; config and prefix replace whole, with an empty prefix encoding removal. Writers verify round-trip equality or log a fallback snapshot.

```ts persistence-catalog
'request/header-delta': { system?: SystemDelta; tools?: ToolsDelta; config?: LlmCallConfig; messagePrefix?: Message[] }
```

Source: [`packages/core/session/src/types.ts:283`](../packages/core/session/src/types.ts)

### `sandbox/*`

#### `sandbox/mode` — log-only

The session's sandbox mode was switched — log-only (like `approval/*`; NOT a surface event, carries no `surfaceOp`): durable and replayable, never in the model transcript. The LAST such event is the session's override (effectiveSandboxMode); who asked for it is derivable from position (an event after the log's last `request/header*` was a runtime switch by the user; see the tool layer's narrator).

```ts persistence-catalog
'sandbox/mode': { mode: SandboxMode }
```

Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:34`](../packages/sandbox/sandbox-policy/src/session-mode.ts)

### `steering/*`

#### `steering/message` — surface

Steering content injected between steps of a running turn.

```ts persistence-catalog
'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
```

Types: [ContentBlock](core-data-structures/core.md) · [MessageSource](core-data-structures/core.md)

Source: [`packages/core/session/src/types.ts:267`](../packages/core/session/src/types.ts)

### `step/*`

#### `step/end` — log-only

Closes step `step` of turn `turn`.

```ts persistence-catalog
'step/end': { turn: number; step: number }
```

Source: [`packages/core/session/src/types.ts:227`](../packages/core/session/src/types.ts)

#### `step/start` — log-only

Opens step `step` of turn `turn` — one model call plus the tool executions it requested.

```ts persistence-catalog
'step/start': { turn: number; step: number }
```

Source: [`packages/core/session/src/types.ts:225`](../packages/core/session/src/types.ts)

### `todo/*`

#### `todo/write` — log-only

Whole-list snapshot; the latest write wins on replay. It is log-only UI state and never enters derived model history.

```ts persistence-catalog
'todo/write': { todos: TodoItem[] }
```

Types: [TodoItem](core-data-structures/session.md)

Source: [`packages/core/session/src/types.ts:272`](../packages/core/session/src/types.ts)

### `tool/*`

#### `tool/call` — log-only

The model requested one tool invocation: `name` with the raw `arguments` JSON string exactly as the model produced it (unparsed). `callId` pairs the call with its `tool/result`.

```ts persistence-catalog
'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
```

Types: [CallId](core-data-structures/core.md)

Source: [`packages/core/session/src/types.ts:255`](../packages/core/session/src/types.ts)

#### `tool/code-dispatch` — log-only

One bridged sub-dispatch from a `run_code` program: the parent `run_code` call id, the deterministic sub-call id (`<parent>:code:<n>`), the tool `name` with its JSON-normalized `arguments` — the exact value dispatched, normalized before dispatch, so this append can never fail on payload shape — whether the sub-call errored, and a bounded `resultSummary` of its model-facing text.

```ts persistence-catalog
'tool/code-dispatch': { parentCallId: CallId; subCallId: CallId; name: string; arguments: unknown; isError: boolean; resultSummary: string }
```

Types: [CallId](core-data-structures/core.md)

Source: [`packages/core/tools/src/code-mode.ts:25`](../packages/core/tools/src/code-mode.ts)

#### `tool/result` — surface

A completed tool call's model-facing result, plus an optional tool-private `meta` presentation payload. `meta` is opaque to the core (`unknown` — the producing tool owns its shape and reads it back in `presentResult`) but MUST be JSON-serializable: `Session.append` runtime-validates all event data with `isJsonValue`, so a non-serializable `meta` is rejected at the source, and the durable log reproduces the identical card on replay. Absent unless the tool attaches one (e.g. `dsh-tool-fs` carries its result-time contextual diff here).

```ts persistence-catalog
'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string }; meta?: unknown }
```

Types: [CallId](core-data-structures/core.md) · [ContentBlock](core-data-structures/core.md)

Source: [`packages/core/session/src/types.ts:265`](../packages/core/session/src/types.ts)

### `turn/*`

#### `turn/end` — log-only

Closes turn `turn` with the TurnEndReason that ended it. The loop fires the awaited `session/flush` checkpoint at every turn end, so the turn boundary is also the durable-commit boundary.

```ts persistence-catalog
'turn/end': { turn: number; reason: TurnEndReason }
```

Types: [TurnEndReason](core-data-structures/session.md)

Source: [`packages/core/session/src/types.ts:223`](../packages/core/session/src/types.ts)

#### `turn/start` — log-only

Opens turn `turn`. `trigger` records what started it — a drained message batch or an idle-time injection. The turn is the durability/replay boundary: every event sits between a `turn/start` and its matching `turn/end` (the turn-enclosure invariant).

```ts persistence-catalog
'turn/start': { turn: number; trigger: TurnTrigger }
```

Types: [TurnTrigger](core-data-structures/session.md)

Source: [`packages/core/session/src/types.ts:217`](../packages/core/session/src/types.ts)

### `user/*`

#### `user/message` — surface

A user-visible prompt (queued message drained at turn start).

```ts persistence-catalog
'user/message': { content: ContentBlock[]; source: MessageSource }
```

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)