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

# Session Persistence Event Catalog

Every event type that can appear in a session's durable event log: the complete persisted `SessionEvent` envelope and each member of the merge-extensible `SessionEventMap` — the owning vocabulary in `@deepseek-ai/dsh-session` plus every plugin declaration merge in this repo — with source JSDoc, full payload declaration, surface badge, and declaration site. It complements [session.md](core-data-structures/session.md) (surface ordering and the `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. Declaration blocks retain the source declaration and nested property JSDoc, removing only the indentation imposed by a containing interface/module, and use a `ts persistence-catalog` fence (skipped by doc-typecheck because declarations reference types from their owning modules). 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 envelope declarations below compose each event's `type`, monotonic `seq`, epoch-ms `time`, `data`, and the conditional `surfaceOp`/`sourceEventSeqs` fields. **surface** marks a `SurfaceEventType` member: it produces an LLM message and declares how it joins the surface list. **log-only** marks everything else: a 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.

## Event envelope

```ts persistence-catalog
/** The appendable event-type keys of {@link SessionEventMap}, plugin-merged extensions included. */
export type SessionEventType = keyof SessionEventMap

/**
 * The subset of {@link SessionEventType} values whose events produce LLM
 * messages and are eligible to appear on the ordered surface. Only these
 * event types may carry {@link SurfaceOp} and {@link SessionEvent.sourceEventSeqs}.
 */
export type SurfaceEventType =
  | 'user/message'
  | 'assistant/message'
  | 'tool/result'
  | 'context/message'
  | 'steering/message'

/**
 * How a session event entered the ordered surface. Only valid on
 * {@link SurfaceEventType} events.
 *
 * - `'append'`: added to the tail — normal path for user/assistant/tool/context
 *   messages.
 * - `{ op: 'replace', start, end }`: replaces surface nodes from `start`
 *   (inclusive) through `end` (inclusive) with this node. Both must exist as
 *   surface nodes in the current surface. `start === end` replaces a single
 *   node. The node's {@link SessionEvent.sourceEventSeqs} must include every
 *   shadowed surface node. Used by compaction and possible other manipulations.
 */
export type SurfaceOp =
  | 'append'
  | { op: 'replace'; start: number; end: number }

/**
 * One immutable entry in the session log.
 *
 * A proper discriminated union over `type` (not independent `type`/`data`
 * unions), so `switch (event.type)` narrows `event.data` without casts.
 *
 * The {@link sourceEventSeqs} and {@link surfaceOp} fields are conditional:
 * they only exist on {@link SurfaceEventType} variants (`user/message`,
 * `assistant/message`, `tool/result`, `context/message`, `steering/message`).
 * Non-surface events (boundary markers, chunks, usage, errors) never carry
 * surface metadata — the compiler enforces this at `Session.append()`
 * call sites.
 */
export type SessionEvent<T extends SessionEventType = SessionEventType> = {
  [K in SessionEventType]: {
    type: K
    /** Monotonic sequence number within the session. */
    seq: number
    /** Unix epoch milliseconds. */
    time: number
    data: SessionEventMap[K]
  } & (K extends SurfaceEventType ? {
    /**
     * Seq numbers of events that are provenance sources of this event
     * (e.g. the `assistant/chunk` seqs that built an `assistant/message`,
     * or the surface nodes shadowed by a compaction replace node). An
     * `assistant/message` may carry a present empty array for a known empty
     * provider stream; omission means unrecorded provenance.
     */
    sourceEventSeqs?: number[]
    /** How this event entered the surface; absent for non-surface events. */
    surfaceOp?: SurfaceOp
  } : object)
}[T]
```

Sources: [`packages/core/session/src/types.ts:255`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:262`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:292`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:324`](../packages/core/session/src/types.ts)

## Events

### `approval/*`

#### `approval/asked` — log-only

```ts persistence-catalog
/**
 * 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).
 */
'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

```ts persistence-catalog
/**
 * 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'`.
 */
'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

```ts persistence-catalog
/**
 * 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 ({@link 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).
 */
'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

```ts persistence-catalog
/** Raw stream chunk — token-level replay fidelity. */
'assistant/chunk': { turn: number; step: number; chunk: StreamChunk }
```

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

Source: [`packages/core/session/src/types.ts:219`](../packages/core/session/src/types.ts)

#### `assistant/message` — surface

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

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

Source: [`packages/core/session/src/types.ts:226`](../packages/core/session/src/types.ts)

### `bash/*`

#### `bash/sandbox-mode` — log-only

```ts persistence-catalog
/**
 * Durable log-only sandbox-mode override; never a surface event or model
 * message. Execution and ACP option reporting fold the latest event through
 * {@link effectiveSandboxMode} without adding a prompt notice.
 */
'bash/sandbox-mode': { mode: SandboxMode }
```

Source: [`packages/bash/bash/src/session-mode.ts:20`](../packages/bash/bash/src/session-mode.ts)

### `compact/*`

#### `compact/end` — log-only

```ts persistence-catalog
/** Marks the end of a compaction — log-only, releases the lock. `error` set if summarization failed. */
'compact/end': { turn: number; error?: string }
```

Source: [`packages/compact/compact/src/types.ts:40`](../packages/compact/compact/src/types.ts)

#### `compact/start` — log-only

```ts persistence-catalog
/** Marks the start of a compaction — log-only, holds the lock until `compact/end`. */
'compact/start': { turn: number }
```

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

#### `compact/summary` — log-only

```ts persistence-catalog
/**
 * 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.
 */
'compact/summary': {
  summary: ContentBlock[]
  shadowedRange: { start: number; end: number }
  shadowedSeqs: number[]
  shadowedTokenCount: number
  /** The provider route that wrote the summary. */
  provider: string
  /**
   * 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
}
```

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

```ts persistence-catalog
/**
 * In-session context injection (file-change notices, subdir AGENTS.md,
 * skill content, cron notifications, …). Rendered into the derived history
 * as synthetic context — NOT a user prompt. `envelope: 'raw'` lets a caller
 * own the complete model-facing frame; `meta` is durable JSON state omitted
 * from the model projection.
 */
'context/message': {
  content: ContentBlock[]
  source: MessageSource
  envelope?: ContextEnvelope
  meta?: JsonValue
}
```

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

Source: [`packages/core/session/src/types.ts:212`](../packages/core/session/src/types.ts)

### `hook/*`

#### `hook/invoked` — log-only

```ts persistence-catalog
/**
 * A hook command was invoked at a hook point — log-only provenance (like
 * `compact/*`; NOT a {@link 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.
 */
'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

```ts persistence-catalog
/**
 * 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.
 */
'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

```ts persistence-catalog
/**
 * 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 {@link effectivePermissionPreset}
 * preserve a selection when bundles match.
 */
'permission/preset': { preset: string }
```

Source: [`packages/ui/permission/src/index.ts:33`](../packages/ui/permission/src/index.ts)

### `prompt/*`

#### `prompt/blocked` — log-only

```ts persistence-catalog
/**
 * 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.
 */
'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:204`](../packages/core/session/src/types.ts)

### `request/*`

#### `request/header` — log-only

```ts persistence-catalog
/**
 * Full header for the next request, appended inside its step before dispatch.
 * It is log-only; the latest snapshot reconstructs the request header.
 */
'request/header': { header: EpochHeader; reason: RequestHeaderReason }
```

Source: [`packages/core/session/src/types.ts:251`](../packages/core/session/src/types.ts)

### `steering/*`

#### `steering/message` — surface

```ts persistence-catalog
/** Steering content injected between steps of a running turn. */
'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:244`](../packages/core/session/src/types.ts)

### `step/*`

#### `step/end` — log-only

```ts persistence-catalog
/** Closes step `step` of turn `turn`. */
'step/end': { turn: number; step: number }
```

Source: [`packages/core/session/src/types.ts:197`](../packages/core/session/src/types.ts)

#### `step/start` — log-only

```ts persistence-catalog
/** Opens step `step` of turn `turn` — one model call plus the tool executions it requested. */
'step/start': { turn: number; step: number }
```

Source: [`packages/core/session/src/types.ts:195`](../packages/core/session/src/types.ts)

### `todo/*`

#### `todo/write` — log-only

```ts persistence-catalog
/** Whole-list snapshot; latest write wins on replay. Log-only UI state; never derived history. */
'todo/write': { todos: TodoItem[] }
```

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

Source: [`packages/core/session/src/types.ts:246`](../packages/core/session/src/types.ts)

### `tool/*`

#### `tool/call` — log-only

```ts persistence-catalog
/**
 * 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`.
 */
'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:232`](../packages/core/session/src/types.ts)

#### `tool/code-dispatch` — log-only

```ts persistence-catalog
/**
 * 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. Before
 * bounding, occurrences of a non-root session workspace path are
 * normalized to `.` so host-specific absolute path lengths cannot change
 * the summary.
 * Log-only: `deriveMessages()` ignores it, so sub-calls never re-enter
 * model context; persistence and UIs get every call. Appended inside the
 * parent `run_code`'s execution (the bridge drains its queue before
 * returning), so the turn-enclosure invariant holds by construction.
 */
'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:34`](../packages/core/tools/src/code-mode.ts)

#### `tool/result` — surface

```ts persistence-catalog
/**
 * 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).
 */
'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:242`](../packages/core/session/src/types.ts)

### `turn/*`

#### `turn/end` — log-only

```ts persistence-catalog
/**
 * Closes turn `turn` with the {@link 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.
 */
'turn/end': { turn: number; reason: TurnEndReason }
```

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

Source: [`packages/core/session/src/types.ts:193`](../packages/core/session/src/types.ts)

#### `turn/start` — log-only

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

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

Source: [`packages/core/session/src/types.ts:187`](../packages/core/session/src/types.ts)

### `user/*`

#### `user/message` — surface

```ts persistence-catalog
/** A user-visible prompt (queued message drained at turn start). */
'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:199`](../packages/core/session/src/types.ts)
