diff --git a/docs/cordis-catalog/events.md b/docs/cordis-catalog/events.md
index f7fe327f80..1dd62f0b76 100644
--- a/docs/cordis-catalog/events.md
+++ b/docs/cordis-catalog/events.md
@@ -47,11 +47,11 @@ A step or turn errored. The loop reports a failure here (plus the logger) even w
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:310`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:311`](../../packages/core/agent/src/types.ts)
 
 ### `agent/post-step` — serial
 
-Awaited serial checkpoint after the response, tool results, injected context, and steering are durable but before `step/end`.
+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.
 
 ```ts cordis-catalog
 'agent/post-step'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, signal: AbortSignal): Promise<void> | void
@@ -59,7 +59,7 @@ Awaited serial checkpoint after the response, tool results, injected context, an
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:263`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:264`](../../packages/core/agent/src/types.ts)
 
 ### `agent/pre-step` — serial
 
@@ -119,7 +119,7 @@ Recover a model-request failure after its failed step has closed. `retry` opens
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:277`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:278`](../../packages/core/agent/src/types.ts)
 
 ### `agent/session-prefix` — waterfall
 
@@ -179,7 +179,7 @@ Override whether the turn continues. The default continues after tool calls or s
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:287`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:288`](../../packages/core/agent/src/types.ts)
 
 ### `agent/turn-stop` — serial
 
@@ -191,7 +191,7 @@ Monotonic terminal-stop checkpoint after continuation and steering are folded; a
 
 Types: [Agent](../core-data-structures/core.md)
 
-Source: [`packages/core/agent/src/types.ts:297`](../../packages/core/agent/src/types.ts)
+Source: [`packages/core/agent/src/types.ts:298`](../../packages/core/agent/src/types.ts)
 
 ## `agent-loop/*`
 
diff --git a/docs/core-data-structures/core.md b/docs/core-data-structures/core.md
index c50134550d..15fd4f2942 100644
--- a/docs/core-data-structures/core.md
+++ b/docs/core-data-structures/core.md
@@ -456,7 +456,7 @@ It returns a `RequestErrorDecision`; `retry` opens a new numbered step after the
 type RequestErrorDecision = { action: 'fail' } | { action: 'retry' }
 ```
 
-`agent/post-step` is the awaited successful-step checkpoint after assistant output, tool results, buffered context, and steering are durable. Its signature is `(agent, turn, step, signal)`; replayable facts remain in the session log rather than a transient payload.
+`agent/post-step` is awaited after assistant output, real or synthetic tool results, buffered context, and steering are durable but before `step/end`. A cancelled tool batch reaches it with an aborted signal after draining; its signature is `(agent, turn, step, signal)`, and replayable facts remain in the session log rather than a transient payload.
 
 `agent/turn-stop` returns the stop-only `ContinuationStop` subset or `undefined`. The loop calls this serial checkpoint after folding the ordinary decision, its reason, and pending steering; a stop is terminal and discards pending steering.
 
diff --git a/docs/event-producer-consumer.md b/docs/event-producer-consumer.md
index 2e39b77563..abba29627b 100644
--- a/docs/event-producer-consumer.md
+++ b/docs/event-producer-consumer.md
@@ -10,19 +10,19 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `agent-loop/config-start-failed` | `emit` | [`packages/core/agent-loop/src/index.ts:362`](../packages/core/agent-loop/src/index.ts) | [`agent-loop`](../packages/core/agent-loop) (`events.dispatch`) | [`stdio`](../packages/ui/stdio) |
 | `agent/created` | `emit` | [`packages/core/agent/src/types.ts:147`](../packages/core/agent/src/types.ts) | [`agent`](../packages/core/agent) (`events.dispatch`) | [`stdio`](../packages/ui/stdio) |
 | `agent/disposed` | `emit` | [`packages/core/agent/src/types.ts:156`](../packages/core/agent/src/types.ts) | [`agent`](../packages/core/agent) (`events.dispatch`) | [`agent-loop`](../packages/core/agent-loop), [`stdio`](../packages/ui/stdio) |
-| `agent/error` | `emit` | [`packages/core/agent/src/types.ts:310`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
-| `agent/post-step` | `serial` | [`packages/core/agent/src/types.ts:263`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`compact-basic`](../packages/compact/compact-basic) |
+| `agent/error` | `emit` | [`packages/core/agent/src/types.ts:311`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
+| `agent/post-step` | `serial` | [`packages/core/agent/src/types.ts:264`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`compact-basic`](../packages/compact/compact-basic) |
 | `agent/pre-step` | `serial` | [`packages/core/agent/src/types.ts:204`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`time-context`](../packages/context/time-context), [`user-approval`](../packages/ui/user-approval) |
 | `agent/prompt-submit` | `waterfall` | [`packages/core/agent/src/types.ts:214`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`acp`](../packages/ui/acp), [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex), [`repeat-tool-guard`](../packages/guard/repeat-tool-guard) |
 | `agent/queued` | `emit` | [`packages/core/agent/src/types.ts:175`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | - |
 | `agent/request` | `waterfall` | [`packages/core/agent/src/types.ts:226`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`acp`](../packages/ui/acp) |
-| `agent/request-error` | `waterfall` | [`packages/core/agent/src/types.ts:277`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`compact-basic`](../packages/compact/compact-basic) |
+| `agent/request-error` | `waterfall` | [`packages/core/agent/src/types.ts:278`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`compact-basic`](../packages/compact/compact-basic) |
 | `agent/session-prefix` | `waterfall` | [`packages/core/agent/src/types.ts:241`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`tool-skill`](../packages/skill/tool-skill), [`workspace-context`](../packages/context/workspace-context) |
 | `agent/session-start` | `emit` | [`packages/core/agent/src/types.ts:188`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex), [`stdio`](../packages/ui/stdio) |
 | `agent/status` | `emit` | [`packages/core/agent/src/types.ts:165`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`invariants`](../packages/support/invariants), [`stdio`](../packages/ui/stdio) |
 | `agent/step-result` | `waterfall` | [`packages/core/agent/src/types.ts:252`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | - |
-| `agent/turn-continuation` | `waterfall` | [`packages/core/agent/src/types.ts:287`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
-| `agent/turn-stop` | `serial` | [`packages/core/agent/src/types.ts:297`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`subagent-inprocess`](../packages/subagent/subagent-inprocess) |
+| `agent/turn-continuation` | `waterfall` | [`packages/core/agent/src/types.ts:288`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
+| `agent/turn-stop` | `serial` | [`packages/core/agent/src/types.ts:298`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`subagent-inprocess`](../packages/subagent/subagent-inprocess) |
 | `approval/request` | `waterfall` | [`packages/ui/user-approval/src/index.ts:31`](../packages/ui/user-approval/src/index.ts) | [`user-approval`](../packages/ui/user-approval) (`waterfall`) | [`acp`](../packages/ui/acp) |
 | `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:61`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
 | `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:70`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`) | [`fs-policy`](../packages/fs/fs-policy) |
diff --git a/packages/cordis/tool-cordis/src/api-catalog.ts b/packages/cordis/tool-cordis/src/api-catalog.ts
index 116366b910..6555aed2a4 100644
--- a/packages/cordis/tool-cordis/src/api-catalog.ts
+++ b/packages/cordis/tool-cordis/src/api-catalog.ts
@@ -323,7 +323,7 @@ export const EVENT_API: readonly EventApiEntry[] = [
     name: 'agent/post-step',
     mode: 'serial',
     signature: '\'agent/post-step\'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, signal: AbortSignal): Promise<void> | void',
-    summary: 'Awaited serial checkpoint after the response, tool results, injected context, and steering are durable but before `step/end`.',
+    summary: 'Awaited serial checkpoint after the response, real or synthetic tool results, injected context, and steering are durable but before `step/end`.',
   },
   {
     name: 'agent/pre-step',
diff --git a/packages/core/agent/src/types.ts b/packages/core/agent/src/types.ts
index 0c79c822f2..702861f407 100644
--- a/packages/core/agent/src/types.ts
+++ b/packages/core/agent/src/types.ts
@@ -251,11 +251,12 @@ declare module 'cordis' {
      */
     'agent/step-result'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, message: Message, next: () => Promise<Message>): Promise<Message>
     /**
-     * Awaited serial checkpoint after the response, tool results, injected
-     * context, and steering are durable but before `step/end`.
-     * @param agent - the agent that completed the step.
+     * 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 completed step 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
diff --git a/website/zh-CN/api/harness/events.md b/website/zh-CN/api/harness/events.md
index 0a7bb0a5f6..bc2a9e7e4b 100644
--- a/website/zh-CN/api/harness/events.md
+++ b/website/zh-CN/api/harness/events.md
@@ -49,7 +49,7 @@ A step or turn errored. The loop reports a failure here (plus the logger) even w
 - `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#L310)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L311)
 
 ### agent/post-step
 
@@ -59,14 +59,14 @@ A step or turn errored. The loop reports a failure here (plus the logger) even w
 'agent/post-step'(this: Scoped<Agent>, agent: Agent, turn: number, step: number, signal: AbortSignal): Promise<void> | void
 ```
 
-Awaited serial checkpoint after the response, tool results, injected context, and steering are durable but before `step/end`.
+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 that completed the step.
+- `agent` — the agent whose step is settling.
 - `turn` — the open turn number.
-- `step` — the completed step 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#L263)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L264)
 
 ### agent/pre-step
 
@@ -151,7 +151,7 @@ Recover a model-request failure after its failed step has closed. `retry` opens
 - `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#L277)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L278)
 
 ### agent/session-prefix
 
@@ -230,7 +230,7 @@ Override whether the turn continues. The default continues after tool calls or s
 - `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#L287)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L288)
 
 ### agent/turn-stop
 
@@ -245,7 +245,7 @@ Monotonic terminal-stop checkpoint after continuation and steering are folded; a
 - `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#L297)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L298)
 
 ## agent-loop/*