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# Harness events

Every event the harness packages declare on the cordis event bus (42 total), grouped by scope. The **mode** is the dispatch semantics (`emit` fire-and-forget, `parallel` awaited, `serial` first-bail, `waterfall` veto-chain — a waterfall listener MUST call `next()` to delegate).

## agent/*

### agent/created

**Mode:** `emit`

```ts website-api
/**
 * A fully configured agent and live session were published. Setup is
 * composition-only; `agent/session-start` is the first startup-driving seam.
 * Synchronous listener failure vetoes publication, while returned-promise
 * rejection is reported. Detach requested during dispatch waits until every
 * creation listener has observed the stable entry.
 * @param agent - the newly registered agent with its live session and completed setup.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode emit
 */
'agent/created'(this: Scoped<Agent>, agent: Agent): void
```

A fully configured agent and live session were published. Setup is composition-only; `agent/session-start` is the first startup-driving seam. Synchronous listener failure vetoes publication, while returned-promise rejection is reported. Detach requested during dispatch waits until every creation listener has observed the stable entry.

- `agent` — the newly registered agent with its live session and completed setup. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L147)

### agent/disposed

**Mode:** `emit`

```ts website-api
/**
 * An agent left the registry; AgentLoop emits this after driver quiescence
 * but before session detachment and scoped-registration unwind. Custom
 * registry users own their driver-ordering contract.
 * @param agent - the exact agent removed from the registry.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode emit
 */
'agent/disposed'(this: Scoped<Agent>, agent: Agent): void
```

An agent left the registry; AgentLoop emits this after driver quiescence but before session detachment and scoped-registration unwind. Custom registry users own their driver-ordering contract.

- `agent` — the exact agent removed from the registry. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L156)

### agent/error

**Mode:** `emit`

```ts website-api
/**
 * A step or turn errored. The loop reports a failure here (plus the logger)
 * even when the error has no in-turn position for a session `error` event.
 * @param agent - the agent whose turn errored.
 * @param turn - the turn in which the failure surfaced.
 * @param step - the step at which the failure surfaced.
 * @param error - the failure, verbatim.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode emit
 */
'agent/error'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, error: Error): void
```

A step or turn errored. The loop reports a failure here (plus the logger) even when the error has no in-turn position for a session `error` event.

- `agent` — the agent whose turn errored.
- `turn` — the turn in which the failure surfaced.
- `step` — the step at which the failure surfaced.
- `error` — the failure, verbatim. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L311)

### agent/post-step

**Mode:** `serial`

```ts website-api
/**
 * Awaited serial checkpoint after the response, real or synthetic tool
 * results, injected context, and steering are durable but before `step/end`.
 * A cancelled tool batch reaches this checkpoint with an aborted signal.
 * @param agent - the agent whose step is settling.
 * @param turn - the open turn number.
 * @param step - the open step number.
 * @param signal - the turn abort signal.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode serial
 */
'agent/post-step'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, signal: AbortSignal): Promise<void> | void
```

Awaited serial checkpoint after the response, real or synthetic tool results, injected context, and steering are durable but before `step/end`. A cancelled tool batch reaches this checkpoint with an aborted signal.

- `agent` — the agent whose step is settling.
- `turn` — the open turn number.
- `step` — the open step number.
- `signal` — the turn abort signal. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L264)

### agent/pre-step

**Mode:** `serial`

```ts website-api
/**
 * Awaited serial checkpoint before `step/start`; appends land outside the
 * pending step and are included when the loop derives request history.
 * `signal` cancels listener work.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @param agent - the agent opening the step.
 * @param turn - the open turn number.
 * @param step - the pending step number.
 * @param signal - the turn abort signal.
 * @mode serial
 */
'agent/pre-step'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, signal: AbortSignal): Promise<void> | void
```

Awaited serial checkpoint before `step/start`; appends land outside the pending step and are included when the loop derives request history. `signal` cancels listener work. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

- `agent` — the agent opening the step.
- `turn` — the open turn number.
- `step` — the pending step number.
- `signal` — the turn abort signal.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L204)

### agent/prompt-submit

**Mode:** `waterfall`

```ts website-api
/**
 * Allow, rewrite, or block one drained prompt before it becomes a user
 * message. Call `next()` for the unchanged default.
 * @param agent - the agent draining its inbox.
 * @param content - the drained message's blocks, as queued.
 * @param source - the message's resolved source.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode waterfall
 */
'agent/prompt-submit'(this: Scoped<Agent>, agent: Agent, content: ContentBlock[], source: MessageSource, next: () => Promise<PromptDecision>): Promise<PromptDecision>
```

Allow, rewrite, or block one drained prompt before it becomes a user message. Call `next()` for the unchanged default.

- `agent` — the agent draining its inbox.
- `content` — the drained message's blocks, as queued.
- `source` — the message's resolved source. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L214)

### agent/queued

**Mode:** `emit`

```ts website-api
/**
 * Detached, frozen content entered the agent's inbox. Source defaults have
 * already been applied, so these are the exact values retained for the log.
 * @param agent - the agent whose inbox received the message.
 * @param content - the accepted content blocks retained by the inbox.
 * @param info - the accepted source plus whether it entered as steering.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode emit
 */
'agent/queued'(this: Scoped<Agent>, agent: Agent, content: ContentBlock[], info: { source: MessageSource; steering: boolean }): void
```

Detached, frozen content entered the agent's inbox. Source defaults have already been applied, so these are the exact values retained for the log.

- `agent` — the agent whose inbox received the message.
- `content` — the accepted content blocks retained by the inbox.
- `info` — the accepted source plus whether it entered as steering. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L175)

### agent/request

**Mode:** `waterfall`

```ts website-api
/**
 * Replace the frozen call configuration. Model-visible content must use
 * logged channels; this seam cannot mutate messages. Injection here joins
 * the next request because the current step boundary is already fixed.
 * @param agent - the agent making the model call.
 * @param turn - the open turn number.
 * @param step - the step whose request this is.
 * @param config - the config the loop would use (frozen); return a replacement to switch.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode waterfall
 */
'agent/request'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, config: LlmCallConfig, next: () => Promise<LlmCallConfig>): Promise<LlmCallConfig>
```

Replace the frozen call configuration. Model-visible content must use logged channels; this seam cannot mutate messages. Injection here joins the next request because the current step boundary is already fixed.

- `agent` — the agent making the model call.
- `turn` — the open turn number.
- `step` — the step whose request this is.
- `config` — the config the loop would use (frozen); return a replacement to switch. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L226)

### agent/request-error

**Mode:** `waterfall`

```ts website-api
/**
 * Recover a model-request failure after its failed step has closed. `retry`
 * opens a new numbered step; `fail` preserves the original request error.
 * Call `next()` to delegate to the next recovery listener or the default.
 * @param agent - the agent whose request failed.
 * @param turn - the open turn number.
 * @param step - the failed step number.
 * @param error - the original model-request failure.
 * @param retryAttempt - zero-based number of prior recovery retries.
 * @param signal - the turn abort signal.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode waterfall
 */
'agent/request-error'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, error: RequestError, retryAttempt: number, signal: AbortSignal, next: () => Promise<RequestErrorDecision>): Promise<RequestErrorDecision>
```

Recover a model-request failure after its failed step has closed. `retry` opens a new numbered step; `fail` preserves the original request error. Call `next()` to delegate to the next recovery listener or the default.

- `agent` — the agent whose request failed.
- `turn` — the open turn number.
- `step` — the failed step number.
- `error` — the original model-request failure.
- `retryAttempt` — zero-based number of prior recovery retries.
- `signal` — the turn abort signal. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L278)

### agent/session-prefix

**Mode:** `waterfall`

```ts website-api
/**
 * Compose request-only messages placed before derived history. The frozen
 * result is computed once per loop instance, logged on its anchoring request
 * header, and reused so the provider prefix remains stable. Interrupted
 * composition is discarded. Composition precedes the first `agent/pre-step`
 * and request boundary, so listener appends join the current request.
 * Changing context belongs in history; contributors should prepend to
 * `await next()` to preserve registration order.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @param agent - the agent whose session prefix is being composed.
 * @param prefix - the frozen seed; return an extended replacement.
 * @param signal - aborts composition when the step is torn down.
 * @mode waterfall
 */
'agent/session-prefix'(this: Scoped<Agent>, agent: Agent, prefix: Message[], signal: AbortSignal, next: () => Promise<Message[]>): Promise<Message[]>
```

Compose request-only messages placed before derived history. The frozen result is computed once per loop instance, logged on its anchoring request header, and reused so the provider prefix remains stable. Interrupted composition is discarded. Composition precedes the first `agent/pre-step` and request boundary, so listener appends join the current request. Changing context belongs in history; contributors should prepend to `await next()` to preserve registration order. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

- `agent` — the agent whose session prefix is being composed.
- `prefix` — the frozen seed; return an extended replacement.
- `signal` — aborts composition when the step is torn down.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L241)

### agent/session-start

**Mode:** `emit`

```ts website-api
/**
 * The session lifecycle began, once before the first turn. Use
 * `agent.inject()` to seed model-facing context. This is a notification, not
 * a veto; disposal requested by a lifecycle owner is rechecked before the
 * driver starts.
 * @param agent - the agent whose session lifecycle began.
 * @param source - why the session started (fresh startup, resume, …).
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode emit
 */
'agent/session-start'(this: Scoped<Agent>, agent: Agent, source: SessionStartSource): void
```

The session lifecycle began, once before the first turn. Use `agent.inject()` to seed model-facing context. This is a notification, not a veto; disposal requested by a lifecycle owner is rechecked before the driver starts.

- `agent` — the agent whose session lifecycle began.
- `source` — why the session started (fresh startup, resume, …). Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L188)

### agent/status

**Mode:** `emit`

```ts website-api
/**
 * Agent status changed (`idle` ⇄ `running`, or → `disposed`). `send()` does
 * not enter `running` synchronously; drive lifecycle from this event.
 * @param agent - the agent whose status flipped.
 * @param status - the status just entered (the transition's destination).
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode emit
 */
'agent/status'(this: Scoped<Agent>, agent: Agent, status: AgentStatus): void
```

Agent status changed (`idle` ⇄ `running`, or → `disposed`). `send()` does not enter `running` synchronously; drive lifecycle from this event.

- `agent` — the agent whose status flipped.
- `status` — the status just entered (the transition's destination). Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L165)

### agent/step-result

**Mode:** `waterfall`

```ts website-api
/**
 * Waterfall: post-process the assembled assistant {@link Message} before
 * tool dispatch (validation, content rewriting, …).
 * @param agent - the agent that received the step's response.
 * @param turn - the open turn number.
 * @param step - the step that produced the message.
 * @param message - the assistant message as assembled from the stream.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode waterfall
 */
'agent/step-result'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, message: Message, next: () => Promise<Message>): Promise<Message>
```

Waterfall: post-process the assembled assistant Message before tool dispatch (validation, content rewriting, …).

- `agent` — the agent that received the step's response.
- `turn` — the open turn number.
- `step` — the step that produced the message.
- `message` — the assistant message as assembled from the stream. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L252)

### agent/turn-continuation

**Mode:** `waterfall`

```ts website-api
/**
 * Override whether the turn continues. The default continues after tool
 * calls or steering and stops otherwise; a continue reason becomes steering.
 * @param agent - the agent deciding whether to run another step.
 * @param turn - the turn being continued or stopped.
 * @param defaultDecision - what the loop would do absent an override.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode waterfall
 */
'agent/turn-continuation'(this: Scoped<Agent>, agent: Agent, turn: number, defaultDecision: ContinuationDecision, next: () => Promise<ContinuationDecision>): Promise<ContinuationDecision>
```

Override whether the turn continues. The default continues after tool calls or steering and stops otherwise; a continue reason becomes steering.

- `agent` — the agent deciding whether to run another step.
- `turn` — the turn being continued or stopped.
- `defaultDecision` — what the loop would do absent an override. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L288)

### agent/turn-stop

**Mode:** `serial`

```ts website-api
/**
 * Monotonic terminal-stop checkpoint after continuation and steering are
 * folded; a stop remains authoritative through turn close and flush:
 * steering queued in that window is discarded, while ordinary sends survive.
 * @param agent - the agent whose composed continuation outcome may be stopped.
 * @param turn - the turn at its terminal-stop checkpoint.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @mode serial
 */
'agent/turn-stop'(this: Scoped<Agent>, agent: Agent, turn: number): ContinuationStop | undefined
```

Monotonic terminal-stop checkpoint after continuation and steering are folded; a stop remains authoritative through turn close and flush: steering queued in that window is discarded, while ordinary sends survive.

- `agent` — the agent whose composed continuation outcome may be stopped.
- `turn` — the turn at its terminal-stop checkpoint. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L298)

## agent-loop/*

### agent-loop/config-start-failed

**Mode:** `emit`

```ts website-api
/**
 * A declarative agent entry failed before it could publish a live agent.
 * Consumers that buffer work for the configured identity use this
 * transient signal to reject that work instead of waiting forever. Normal
 * factory teardown suppresses failures from the cancelled startup attempt.
 * @param sessionId - exact shared agent/session identity that failed startup.
 * @param error - persistence, setup, or publication failure.
 * @mode emit
 */
'agent-loop/config-start-failed'(sessionId: SessionId, error: unknown): void
```

A declarative agent entry failed before it could publish a live agent. Consumers that buffer work for the configured identity use this transient signal to reject that work instead of waiting forever. Normal factory teardown suppresses failures from the cancelled startup attempt.

- `sessionId` — exact shared agent/session identity that failed startup.
- `error` — persistence, setup, or publication failure.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent-loop/src/index.ts#L362)

## approval/*

### approval/request

**Mode:** `waterfall`

```ts website-api
/**
 * Ask composed answerers for one decision. Return an outcome to claim the
 * request or call `next()`; failure yields the fail-closed default.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 * @param req - the pending decision (agent, tool identity, reason, signal).
 * @mode waterfall
 */
'approval/request'(this: Scoped<ApprovalService>, req: ApprovalRequest, next: () => Promise<ApprovalOutcome>): Promise<ApprovalOutcome>
```

Ask composed answerers for one decision. Return an outcome to claim the request or call `next()`; failure yields the fail-closed default. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.

- `req` — the pending decision (agent, tool identity, reason, signal).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/ui/user-approval/src/index.ts#L31)

## fs/*

### fs/edit-intent

**Mode:** `waterfall`

```ts website-api
/**
 * Single-slot decision for the next {@link FileSystem.editText}. Calling
 * `next()` yields an unconditional edit; the first returned guard wins.
 * @param target - the resolved target about to be edited.
 * @param actor - the opaque tool-execution context the decider keys off.
 * @mode waterfall
 */
'fs/edit-intent'(target: FsTarget, actor: object | undefined, next: () => { version: FsVersion } | undefined | Promise<{ version: FsVersion } | undefined>): Promise<{ version: FsVersion } | undefined>
```

Single-slot decision for the next FileSystem.editText. Calling `next()` yields an unconditional edit; the first returned guard wins.

- `target` — the resolved target about to be edited.
- `actor` — the opaque tool-execution context the decider keys off.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/fs/fs/src/index.ts#L61)

### fs/observed

**Mode:** `emit`

```ts website-api
/**
 * Record a successful observation. Listeners must be synchronous recorders:
 * throws fail the tool call and returned promises are not awaited.
 * @param target - the target that was read/written/edited.
 * @param version - the version the actor now holds as its observation.
 * @param actor - the observing tool-execution context; undefined records nothing useful.
 * @mode emit
 */
'fs/observed'(target: FsTarget, version: FsVersion, actor: object | undefined): void
```

Record a successful observation. Listeners must be synchronous recorders: throws fail the tool call and returned promises are not awaited.

- `target` — the target that was read/written/edited.
- `version` — the version the actor now holds as its observation.
- `actor` — the observing tool-execution context; undefined records nothing useful.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/fs/fs/src/index.ts#L70)

### fs/write-intent

**Mode:** `waterfall`

```ts website-api
/**
 * Single-slot decision for the next {@link FileSystem.writeText}. Calling
 * `next()` yields the bare provider's unconditional write; the first listener
 * that returns an intent owns the decision rather than composing with peers.
 * @param target - the resolved target about to be written.
 * @param actor - the opaque tool-execution context the decider keys off.
 * @mode waterfall
 */
'fs/write-intent'(target: FsTarget, actor: object | undefined, next: () => FsWriteIntent | undefined | Promise<FsWriteIntent | undefined>): Promise<FsWriteIntent | undefined>
```

Single-slot decision for the next FileSystem.writeText. Calling `next()` yields the bare provider's unconditional write; the first listener that returns an intent owns the decision rather than composing with peers.

- `target` — the resolved target about to be written.
- `actor` — the opaque tool-execution context the decider keys off.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/fs/fs/src/index.ts#L53)

## llm/*

### llm/stream

**Mode:** `waterfall`

```ts website-api
/**
 * 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. 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>
```

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.

- `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.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/llm/llm/src/index.ts#L43)

## session/*

### session/created

**Mode:** `emit`

```ts website-api
/**
 * Creation announcement during session publication. A synchronous throw vetoes and rolls
 * back with a paired disposal; detach requested during dispatch is deferred.
 * A returned-promise rejection is logged but cannot retroactively veto this
 * synchronous boundary.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners
 * receive only sessions entered through that agent's context.
 * @param session - the session just entered and announced.
 * @dshScopeScan unsupported
 * @mode emit
 */
'session/created'(this: Scoped<Session>, session: Session): void
```

Creation announcement during session publication. A synchronous throw vetoes and rolls back with a paired disposal; detach requested during dispatch is deferred. A returned-promise rejection is logged but cannot retroactively veto this synchronous boundary. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only sessions entered through that agent's context.

- `session` — the session just entered and announced.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L47)

### session/disposed

**Mode:** `emit`

```ts website-api
/**
 * Emitted once when an announced session leaves the store, including
 * publication rollback, but never for an entry whose creation announcement
 * did not begin. Listener failures are logged and contained.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`) reuses the owner scope.
 * @param session - the session that is no longer live in the store.
 * @dshScopeScan unsupported
 * @mode emit
 */
'session/disposed'(this: Scoped<Session>, session: Session): void
```

Emitted once when an announced session leaves the store, including publication rollback, but never for an entry whose creation announcement did not begin. Listener failures are logged and contained. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`) reuses the owner scope.

- `session` — the session that is no longer live in the store.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L57)

### session/event

**Mode:** `emit`

```ts website-api
/**
 * Post-commit, fire-and-forget append feed. The listener snapshot resolves
 * before the log push, but callbacks run after it; observer failures are
 * logged and contained without making the committed append fail.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners
 * receive only events from sessions entered through that agent's context.
 * @param session - the session whose log grew.
 * @param event - the appended event, exactly as recorded.
 * @dshScopeScan unsupported
 * @mode emit
 */
'session/event'(this: Scoped<Session>, session: Session, event: SessionEvent): void
```

Post-commit, fire-and-forget append feed. The listener snapshot resolves before the log push, but callbacks run after it; observer failures are logged and contained without making the committed append fail. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only events from sessions entered through that agent's context.

- `session` — the session whose log grew.
- `event` — the appended event, exactly as recorded.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L69)

### session/flush

**Mode:** `parallel`

```ts website-api
/**
 * Awaited parallel durability checkpoint: every listener runs and the
 * caller awaits all of them, with no waterfall veto. Dispatch through
 * {@link SessionStore.flush}. Scope-filtered dispatch
 * (`@deepseek-ai/dsh-scope`) reuses the session's owner scope.
 * @param session - the session whose buffered events must reach durable storage.
 * @dshScopeScan unsupported
 * @mode parallel
 */
'session/flush'(this: Scoped<Session>, session: Session): Promise<void> | void
```

Awaited parallel durability checkpoint: every listener runs and the caller awaits all of them, with no waterfall veto. Dispatch through SessionStore.flush. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`) reuses the session's owner scope.

- `session` — the session whose buffered events must reach durable storage.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L79)

## subagent/*

### subagent/end

**Mode:** `emit`

```ts website-api
/**
 * A ready child settled. Scope-filtered dispatch uses the same delegating
 * parent carrier as `subagent/start`, so the lifecycle pair reaches the
 * same scoped audience.
 * @param info - the run identity and terminal outcome.
 * @dshScopeScan unsupported
 * @mode emit
 */
'subagent/end'(this: Scoped<SubagentService>, info: SubagentRunEndInfo): void
```

A ready child settled. Scope-filtered dispatch uses the same delegating parent carrier as `subagent/start`, so the lifecycle pair reaches the same scoped audience.

- `info` — the run identity and terminal outcome.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/subagent/subagent/src/index.ts#L112)

### subagent/provider-added

**Mode:** `emit`

```ts website-api
/**
 * A provider became resolvable in the registry.
 * @param provider - the registered provider.
 * @mode emit
 */
'subagent/provider-added'(provider: SubagentProvider): void
```

A provider became resolvable in the registry.

- `provider` — the registered provider.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/subagent/subagent/src/index.ts#L86)

### subagent/provider-removed

**Mode:** `emit`

```ts website-api
/**
 * A provider left the registry. Accepted runs remain holder-owned.
 * @param name - the provider name that no longer resolves.
 * @mode emit
 */
'subagent/provider-removed'(name: string): void
```

A provider left the registry. Accepted runs remain holder-owned.

- `name` — the provider name that no longer resolves.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/subagent/subagent/src/index.ts#L92)

### subagent/start

**Mode:** `emit`

```ts website-api
/**
 * A provider established a ready child. For in-process providers,
 * `ctx.agents.get(info.id)` resolves during this notification.
 * Scope-filtered dispatch keys the carrier by the delegating parent, so a
 * parent-scoped listener observes only its own delegations. Paired with
 * `subagent/end`.
 * @param info - the provider and ready child identity.
 * @dshScopeScan unsupported
 * @mode emit
 */
'subagent/start'(this: Scoped<SubagentService>, info: SubagentRunInfo): void
```

A provider established a ready child. For in-process providers, `ctx.agents.get(info.id)` resolves during this notification. Scope-filtered dispatch keys the carrier by the delegating parent, so a parent-scoped listener observes only its own delegations. Paired with `subagent/end`.

- `info` — the provider and ready child identity.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/subagent/subagent/src/index.ts#L103)

## system-prompt/*

### system-prompt/assemble

**Mode:** `waterfall`

```ts website-api
/**
 * Expert waterfall over the assembled sections, tools, and variables.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): scoped listeners
 * receive only that scope's assemblies. The returned value is authoritative.
 * @param assembly - the mutable assembly built from registered providers.
 * @param context - the caller's per-assembly context.
 * @mode waterfall
 */
'system-prompt/assemble'(this: Scoped<SystemPrompt>, assembly: PromptAssembly, context: AssembleContext, next: () => Promise<PromptAssembly>): Promise<PromptAssembly>
```

Expert waterfall over the assembled sections, tools, and variables. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): scoped listeners receive only that scope's assemblies. The returned value is authoritative.

- `assembly` — the mutable assembly built from registered providers.
- `context` — the caller's per-assembly context.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/system-prompt/src/index.ts#L27)

### system-prompt/change

**Mode:** `emit`

```ts website-api
/**
 * Emitted when any prompt provider changes. This registry notification is
 * unfiltered because a global change affects every scope.
 * @mode emit
 */
'system-prompt/change'(): void
```

Emitted when any prompt provider changes. This registry notification is unfiltered because a global change affects every scope.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/system-prompt/src/index.ts#L33)

## tools/*

### tools/change

**Mode:** `emit`

```ts website-api
/**
 * A tool was registered or unregistered, or a scoped restriction changed
 * (the available tool set changed — possibly for one scope only). An
 * UNFILTERED registry-subject notification, deliberately not scope-filtered
 * dispatch: a global change concerns every agent's next assembly, so a
 * scoped listener subscribing here sees every change, not just its own
 * scope's.
 * @mode emit
 */
'tools/change'(): void
```

A tool was registered or unregistered, or a scoped restriction changed (the available tool set changed — possibly for one scope only). An UNFILTERED registry-subject notification, deliberately not scope-filtered dispatch: a global change concerns every agent's next assembly, so a scoped listener subscribing here sees every change, not just its own scope's.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/tools/src/index.ts#L116)

### tools/execute

**Mode:** `waterfall`

```ts website-api
/**
 * Around-dispatch waterfall for timeout, retry, or metrics. `next()` returns
 * a normalized result; wrappers may change only `exec.signal`, while call
 * identity remains immutable.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.
 * @param exec - the allowed call about to dispatch (name, parsed arguments, caller agent, signal).
 * @mode waterfall
 */
'tools/execute'(this: Scoped<ToolRegistry>, exec: ToolExecution, next: () => Promise<ToolExecutionResult>): Promise<ToolExecutionResult>
```

Around-dispatch waterfall for timeout, retry, or metrics. `next()` returns a normalized result; wrappers may change only `exec.signal`, while call identity remains immutable. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.

- `exec` — the allowed call about to dispatch (name, parsed arguments, caller agent, signal).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/tools/src/index.ts#L89)

### tools/post-execute

**Mode:** `waterfall`

```ts website-api
/**
 * Accept, replace, enrich, or block a normalized dispatch result. `next()`
 * accepts it unchanged; thrown tools still reach this seam as errors.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.
 * @param exec - the call that just ran (name, parsed arguments, caller agent).
 * @param result - the dispatch outcome a listener may accept, replace, or block.
 * @mode waterfall
 */
'tools/post-execute'(this: Scoped<ToolRegistry>, exec: ToolExecution, result: Readonly<ToolExecutionResult>, next: () => Promise<PostToolDecision>): Promise<PostToolDecision>
```

Accept, replace, enrich, or block a normalized dispatch result. `next()` accepts it unchanged; thrown tools still reach this seam as errors. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.

- `exec` — the call that just ran (name, parsed arguments, caller agent).
- `result` — the dispatch outcome a listener may accept, replace, or block.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/tools/src/index.ts#L98)

### tools/pre-execute

**Mode:** `waterfall`

```ts website-api
/**
 * Allow, deny, or ask before dispatch. `next()` delegates to allow; missing
 * approval support turns `ask` into denial.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.
 * @param exec - the pending call (name, parsed arguments, caller agent).
 * @mode waterfall
 */
'tools/pre-execute'(this: Scoped<ToolRegistry>, exec: ToolExecution, next: () => Promise<PreToolDecision>): Promise<PreToolDecision>
```

Allow, deny, or ask before dispatch. `next()` delegates to allow; missing approval support turns `ask` into denial. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.

- `exec` — the pending call (name, parsed arguments, caller agent).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/tools/src/index.ts#L80)

### tools/result

**Mode:** `emit`

```ts website-api
/**
 * Observe the frozen, lossless-JSON final outcome. Listener failures are contained.
 * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): keyed by `exec.agent`.
 * @param exec - the execution object that traversed the pipeline.
 * @param result - a deep-frozen snapshot of the final returned result.
 * @mode emit
 */
'tools/result'(this: Scoped<ToolRegistry>, exec: Readonly<ToolExecution>, result: Readonly<ToolExecutionResult>): undefined
```

Observe the frozen, lossless-JSON final outcome. Listener failures are contained. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): keyed by `exec.agent`.

- `exec` — the execution object that traversed the pipeline.
- `result` — a deep-frozen snapshot of the final returned result.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/tools/src/index.ts#L106)

## workflow/*

### workflow/agent-end

**Mode:** `emit`

```ts website-api
/**
 * One `agent()` call settled (clean result, child failure, or run
 * cancellation). Paired with {@link Events['workflow/agent-start']} by
 * `agent.seq`, exactly once per started call on every stop path — on an
 * engine termination path (a worker killed past its grace) the end is
 * engine-synthesized with outcome `'cancelled'`.
 * @param info - the run's identity snapshot.
 * @param agent - the call identity plus its outcome.
 * @mode emit
 */
'workflow/agent-end'(info: WorkflowRunInfo, agent: WorkflowAgentEndInfo): void
```

One `agent()` call settled (clean result, child failure, or run cancellation). Paired with Events['workflow/agent-start'] by `agent.seq`, exactly once per started call on every stop path — on an engine termination path (a worker killed past its grace) the end is engine-synthesized with outcome `'cancelled'`.

- `info` — the run's identity snapshot.
- `agent` — the call identity plus its outcome.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/workflow/workflow/src/index.ts#L81)

### workflow/agent-start

**Mode:** `emit`

```ts website-api
/**
 * One `agent()` call established a ready child run. Paired with
 * {@link Events['workflow/agent-end']} by `agent.seq`. A call that never
 * receives a ready run from the provider emits neither
 * event in this pair.
 * @param info - the run's identity snapshot.
 * @param agent - the call's sequence number, label, phase, and child id.
 * @mode emit
 */
'workflow/agent-start'(info: WorkflowRunInfo, agent: WorkflowAgentInfo): void
```

One `agent()` call established a ready child run. Paired with Events['workflow/agent-end'] by `agent.seq`. A call that never receives a ready run from the provider emits neither event in this pair.

- `info` — the run's identity snapshot.
- `agent` — the call's sequence number, label, phase, and child id.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/workflow/workflow/src/index.ts#L70)

### workflow/end

**Mode:** `emit`

```ts website-api
/**
 * A workflow run settled (any stop reason). Fired when
 * {@link WorkflowRun.result} resolves. Paired with
 * {@link Events['workflow/start']}.
 * @param info - the run's identity snapshot.
 * @param result - the outcome data (stop reason, error, agent count) —
 *   deliberately WITHOUT the result value (see {@link WorkflowResultInfo}).
 * @mode emit
 */
'workflow/end'(info: WorkflowRunInfo, result: WorkflowResultInfo): void
```

A workflow run settled (any stop reason). Fired when WorkflowRun.result resolves. Paired with Events['workflow/start'].

- `info` — the run's identity snapshot.
- `result` — the outcome data (stop reason, error, agent count) — deliberately WITHOUT the result value (see `WorkflowResultInfo`).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/workflow/workflow/src/index.ts#L91)

### workflow/log

**Mode:** `emit`

```ts website-api
/**
 * The script emitted a narration line (a `log(message)` call).
 * @param info - the run's identity snapshot.
 * @param message - the logged message, verbatim.
 * @mode emit
 */
'workflow/log'(info: WorkflowRunInfo, message: string): void
```

The script emitted a narration line (a `log(message)` call).

- `info` — the run's identity snapshot.
- `message` — the logged message, verbatim.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/workflow/workflow/src/index.ts#L60)

### workflow/phase

**Mode:** `emit`

```ts website-api
/**
 * The script entered a phase (a `phase(title)` call) — progress grouping
 * for observers; no execution semantics.
 * @param info - the run's identity snapshot.
 * @param title - the phase title, verbatim.
 * @mode emit
 */
'workflow/phase'(info: WorkflowRunInfo, title: string): void
```

The script entered a phase (a `phase(title)` call) — progress grouping for observers; no execution semantics.

- `info` — the run's identity snapshot.
- `title` — the phase title, verbatim.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/workflow/workflow/src/index.ts#L53)

### workflow/start

**Mode:** `emit`

```ts website-api
/**
 * A workflow run started — the script's meta block validated, the body
 * about to execute. Paired with {@link Events['workflow/end']}.
 * @param info - the run's identity snapshot (id + meta).
 * @mode emit
 */
'workflow/start'(info: WorkflowRunInfo): void
```

A workflow run started — the script's meta block validated, the body about to execute. Paired with Events['workflow/end'].

- `info` — the run's identity snapshot (id + meta).

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/workflow/workflow/src/index.ts#L45)
