diff --git a/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.i18n.yaml b/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.i18n.yaml
index 3a007a3dd7..dacf0b9564 100644
--- a/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.i18n.yaml
+++ b/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-07-22-unified-send-and-coalesced-user-messages.md: 2fd77df51ebaaad2fa0bbe17d3f8493148b761bc
-2026-07-22-unified-send-and-coalesced-user-messages.zh.md: 2d4b678b6b3efb4c9ca68c79d8cadaf13b3eac04
+2026-07-22-unified-send-and-coalesced-user-messages.md: ae2d25f56fedc8fc05fbad1793003b393e3a8feb
+2026-07-22-unified-send-and-coalesced-user-messages.zh.md: 77fa248f50867faa3747c5dcea70e63032c98113
diff --git a/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.md b/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.md
index 2fd77df51e..ae2d25f56f 100644
--- a/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.md
+++ b/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.md
@@ -12,7 +12,7 @@ Separately, `context/message` and `user/message` had converged: the surface proj
 
 ## Decision
 
-**One primitive, three preset aliases.** `Agent` is now an abstract class whose single abstract `send(content, { target, wakeup, source })` covers the (`target` × `wakeup`) matrix. `followup` (`next-turn`/wakeup), `steer` (`next-step`/wakeup), and `inject` (`next-step`/no-wakeup) are concrete delegates on the base class, so concrete drivers implement `send` once and inherit the ergonomic presets. `wakeup` means "make the model run": wake a parked driver for a `next-turn` item, or force a continuation for a running `next-step` item. `send` defaults to `{ target: 'next-turn', wakeup: true }`, so every prior bare `agent.send(content)` call keeps its exact behavior. `next-turn`/no-wakeup (queue without waking) is now representable with no alias and no current caller.
+**One primitive, three preset aliases.** `Agent` is now an abstract class whose single abstract `send(content, { target, wakeup, source })` covers the (`target` × `wakeup`) matrix. Its complete options object is required, so routing and provenance remain explicit. `followup` (`next-turn`/wakeup), `steer` (`next-step`/wakeup), and `inject` (`next-step`/no-wakeup) are concrete delegates on the base class, so concrete drivers implement `send` once and callers use `followup(content)` for the ordinary user-message preset. `wakeup` means "make the model run": wake a parked driver for a `next-turn` item, or force a continuation for a running `next-step` item. `next-turn`/no-wakeup (queue without waking) is representable with no alias and no current caller.
 
 **inject keeps its mechanism.** The `next-step`/no-wakeup path is exactly the old `inject`: durable model-facing context appended at the current log position, deferred behind an executing tool batch while a turn is open and appended directly between turns while idle. It bypasses the FIFOs entirely and defaults its source to `{ kind: 'plugin', plugin: '' }`, never `{ kind: 'user' }`.
 
diff --git a/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.zh.md b/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.zh.md
index 2d4b678b6b..77fa248f50 100644
--- a/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.zh.md
+++ b/.agents/notes/implemented/architecture/2026-07-22-unified-send-and-coalesced-user-messages.zh.md
@@ -12,7 +12,7 @@ agent 的对外驱动接口逐渐长出三个近乎平行的动词——`send`
 
 ## 决策
 
-**一个原语，三个预设别名。** `Agent` 现在是一个抽象类，其唯一的抽象方法 `send(content, { target, wakeup, source })` 覆盖 (`target` × `wakeup`) 矩阵。`followup`（`next-turn`/wakeup）、`steer`（`next-step`/wakeup）和 `inject`（`next-step`/no-wakeup）是基类上的具体委托方法，因此具体驱动器只需实现一次 `send`，就能继承这些好用的预设。`wakeup` 意为“让模型运行”：为一个 `next-turn` 队列项唤醒处于停泊状态的驱动器，或为一个运行中的 `next-step` 队列项强制继续执行。`send` 默认使用 `{ target: 'next-turn', wakeup: true }`，因此此前每一次裸调用 `agent.send(content)` 都保持完全相同的行为。`next-turn`/no-wakeup（入队但不唤醒）现在可以表达，只是没有别名，也没有当前调用方。
+**一个原语，三个预设别名。** `Agent` 现在是一个抽象类，其唯一的抽象方法 `send(content, { target, wakeup, source })` 覆盖 (`target` × `wakeup`) 矩阵。完整的选项对象为必填，因此路由和 provenance 保持显式。`followup`（`next-turn`/wakeup）、`steer`（`next-step`/wakeup）和 `inject`（`next-step`/no-wakeup）是基类上的具体委托方法，因此具体驱动器只需实现一次 `send`，调用方则使用 `followup(content)` 作为普通用户消息预设。`wakeup` 意为“让模型运行”：为一个 `next-turn` 队列项唤醒处于停泊状态的驱动器，或为一个运行中的 `next-step` 队列项强制继续执行。`next-turn`/no-wakeup（入队但不唤醒）可以表达，只是没有别名，也没有当前调用方。
 
 **inject 保留其机制。** `next-step`/no-wakeup 路径正是旧的 `inject`：持久的面向模型上下文会追加到当前日志位置；轮次打开时，它会延迟到执行中的工具批处理之后，空闲时则直接追加在两个轮次之间。它完全绕过 FIFO 队列，并把来源默认设为 `{ kind: 'plugin', plugin: '' }`，绝不是 `{ kind: 'user' }`。
 
diff --git a/docs/architecture.i18n.yaml b/docs/architecture.i18n.yaml
index 5ffa67673f..8568b125fa 100644
--- a/docs/architecture.i18n.yaml
+++ b/docs/architecture.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-architecture.md: 164b019855b371172d40564af447d6359f5e4ff6
-architecture.zh.md: 586dc8a52afb9487df3f801cfd07fcca4afa4cf9
+architecture.md: c8f328560600d8a7e1f1ab659fab39c13c18dee3
+architecture.zh.md: 61fba67a8585220e1ef59f02844271fee8a46401
diff --git a/docs/architecture.md b/docs/architecture.md
index 164b019855..c8f3285606 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -126,7 +126,7 @@ Turn and step execution events are turn-enclosed; an idle injected `user/message
 
 ### Agent Handles
 
-`ctx.agents` owns live agents and returns `AgentHandle { agent, dispose() }`. Plugins use `send()`, `steer()`, `inject()`, `cancel()`, and `whenIdle()`. The caller fiber, factory provider, and consumer handle co-own teardown through one awaited disposer.
+`ctx.agents` owns live agents and returns `AgentHandle { agent, dispose() }`. Plugins use `send(content, completeOptions)` when routing must be explicit, or the `followup()`, `steer()`, and `inject()` presets; `cancel()` and `whenIdle()` control lifecycle. The caller fiber, factory provider, and consumer handle co-own teardown through one awaited disposer.
 
 ### Agent Scope
 
diff --git a/docs/architecture.zh.md b/docs/architecture.zh.md
index 586dc8a52a..61fba67a85 100644
--- a/docs/architecture.zh.md
+++ b/docs/architecture.zh.md
@@ -126,7 +126,7 @@ idle inject:
 
 ### Agent 句柄
 
-`ctx.agents` 拥有活跃 agent，并返回 `AgentHandle { agent, dispose() }`。插件使用 `send()`、`steer()`、`inject()`、`cancel()` 和 `whenIdle()`。调用方 fiber、工厂提供方和消费方句柄通过同一个需等待完成的 disposer 共同拥有拆卸过程。
+`ctx.agents` 拥有活跃 agent，并返回 `AgentHandle { agent, dispose() }`。插件需要显式路由时使用 `send(content, completeOptions)`，否则使用 `followup()`、`steer()` 和 `inject()` 预设；`cancel()` 与 `whenIdle()` 控制生命周期。调用方 fiber、工厂提供方和消费方句柄通过同一个需等待完成的 disposer 共同拥有拆卸过程。
 
 ### Agent 作用域
 
diff --git a/docs/core-data-structures/core.i18n.yaml b/docs/core-data-structures/core.i18n.yaml
index 64ed3afdcb..4d2dc00fca 100644
--- a/docs/core-data-structures/core.i18n.yaml
+++ b/docs/core-data-structures/core.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-core.md: 36d65522201bddfd491a4f4f26b4f4b3303e4a77
-core.zh.md: f065a67a2f279944ba77d25076e4b190d09f6cd0
+core.md: 1d7a06405bbda523f37389e1b09c62549ece6750
+core.zh.md: 2048a59451c3064eefdfe4225cc186c77921a9c0
diff --git a/docs/core-data-structures/core.md b/docs/core-data-structures/core.md
index 36d6552220..1d7a06405b 100644
--- a/docs/core-data-structures/core.md
+++ b/docs/core-data-structures/core.md
@@ -378,27 +378,22 @@ type SendTarget = 'next-turn' | 'next-step'
  * (`next-turn`/wakeup), {@link Agent.steer} (`next-step`/wakeup), and
  * {@link Agent.inject} (`next-step`/no-wakeup).
  *
- * An omitted source attests direct human input as `{ kind: 'user' }` and may
- * authorize policy consumers, so non-human producers must label their content.
+ * The object is complete so routing and provenance are explicit; callers that
+ * want the ordinary user-message preset use {@link Agent.followup}.
  */
 interface SendOptions {
-  /** Queue the item joins; defaults to `next-turn`. */
-  target?: SendTarget
+  /** Queue the item joins. */
+  target: SendTarget
   /**
    * Whether this item makes the model run: wake a parked driver (`next-turn`)
-   * or force a continuation step (`next-step` while running). Defaults to
-   * `true`. A `false` `next-turn` item queues without waking; a `false`
+   * or force a continuation step (`next-step` while running). A `false`
+   * `next-turn` item queues without waking; a `false`
    * `next-step` item attaches durable context without forcing another step
    * (the injection preset).
    */
-  wakeup?: boolean
-  source?: MessageSource
-  /**
-   * Model-facing contexts captured with this inbox item. A queued prompt exposes
-   * them through the default `agent/prompt-submit` allow decision, while steering
-   * records them directly at its next checkpoint.
-   */
-  contexts?: HookContext[]
+  wakeup: boolean
+  /** Producer provenance; direct human input uses `{ kind: 'user' }`. */
+  source: MessageSource
 }
 ```
 
@@ -406,7 +401,10 @@ The fixed-preset aliases own `target` and `wakeup`, so they accept only the rema
 
 ```ts type-equiv
 /** Options accepted by the fixed-preset aliases, which own `target` and `wakeup`. */
-type AliasSendOptions = Omit<SendOptions, 'target' | 'wakeup'>
+interface AliasSendOptions {
+  /** Producer provenance; each alias supplies its documented default when omitted. */
+  source?: MessageSource
+}
 ```
 
 `send` returns the accepted message's opaque `AgentMessageId`, stable across that message's `agent/inbox/*` events:
@@ -479,8 +477,8 @@ abstract class Agent {
    * The unified delivery primitive over the (`target` × `wakeup`) matrix.
    * Detaches, validates, and freezes one lossless-JSON item, then routes it:
    *
-   * - `next-turn` (default) queues an item that becomes the sole ordinary
-   *   message of its own FIFO-ordered turn; `wakeup` (default `true`) wakes a
+   * - `next-turn` queues an item that becomes the sole ordinary message of its
+   *   own FIFO-ordered turn; `wakeup:true` wakes a
    *   parked driver, while `wakeup:false` queues without waking.
    * - `next-step` with `wakeup:true` submits steering into the active turn
    *   (idle falls back to a woken `next-turn`).
@@ -492,10 +490,10 @@ abstract class Agent {
    * Attached contexts share the same snapshot and ownership boundary. Invalid
    * input throws synchronously before any notification, enqueue, or append.
    * @param content - the model-facing content blocks to deliver.
-   * @param options - target queue, wakeup decision, source, and contexts.
+   * @param options - target queue, wakeup decision, and source.
    * @returns the accepted message's {@link AgentMessageId}, stable across its `agent/inbox/*` events.
    */
-  abstract send(content: ContentBlock[], options?: SendOptions): AgentMessageId
+  abstract send(content: ContentBlock[], options: SendOptions): AgentMessageId
 
   /**
    * Clear queued and steering work — unless `keepInbox` — and abort the active
diff --git a/docs/core-data-structures/core.zh.md b/docs/core-data-structures/core.zh.md
index f065a67a2f..2048a59451 100644
--- a/docs/core-data-structures/core.zh.md
+++ b/docs/core-data-structures/core.zh.md
@@ -380,27 +380,22 @@ type SendTarget = 'next-turn' | 'next-step'
  * (`next-turn`/wakeup), {@link Agent.steer} (`next-step`/wakeup), and
  * {@link Agent.inject} (`next-step`/no-wakeup).
  *
- * An omitted source attests direct human input as `{ kind: 'user' }` and may
- * authorize policy consumers, so non-human producers must label their content.
+ * The object is complete so routing and provenance are explicit; callers that
+ * want the ordinary user-message preset use {@link Agent.followup}.
  */
 interface SendOptions {
-  /** Queue the item joins; defaults to `next-turn`. */
-  target?: SendTarget
+  /** Queue the item joins. */
+  target: SendTarget
   /**
    * Whether this item makes the model run: wake a parked driver (`next-turn`)
-   * or force a continuation step (`next-step` while running). Defaults to
-   * `true`. A `false` `next-turn` item queues without waking; a `false`
+   * or force a continuation step (`next-step` while running). A `false`
+   * `next-turn` item queues without waking; a `false`
    * `next-step` item attaches durable context without forcing another step
    * (the injection preset).
    */
-  wakeup?: boolean
-  source?: MessageSource
-  /**
-   * Model-facing contexts captured with this inbox item. A queued prompt exposes
-   * them through the default `agent/prompt-submit` allow decision, while steering
-   * records them directly at its next checkpoint.
-   */
-  contexts?: HookContext[]
+  wakeup: boolean
+  /** Producer provenance; direct human input uses `{ kind: 'user' }`. */
+  source: MessageSource
 }
 ```
 
@@ -408,7 +403,10 @@ interface SendOptions {
 
 ```ts type-equiv
 /** Options accepted by the fixed-preset aliases, which own `target` and `wakeup`. */
-type AliasSendOptions = Omit<SendOptions, 'target' | 'wakeup'>
+interface AliasSendOptions {
+  /** Producer provenance; each alias supplies its documented default when omitted. */
+  source?: MessageSource
+}
 ```
 
 `send` 返回被接受消息的不透明 `AgentMessageId`，并在该消息的 `agent/inbox/*` 事件中保持稳定：
@@ -481,8 +479,8 @@ abstract class Agent {
    * The unified delivery primitive over the (`target` × `wakeup`) matrix.
    * Detaches, validates, and freezes one lossless-JSON item, then routes it:
    *
-   * - `next-turn` (default) queues an item that becomes the sole ordinary
-   *   message of its own FIFO-ordered turn; `wakeup` (default `true`) wakes a
+   * - `next-turn` queues an item that becomes the sole ordinary message of its
+   *   own FIFO-ordered turn; `wakeup:true` wakes a
    *   parked driver, while `wakeup:false` queues without waking.
    * - `next-step` with `wakeup:true` submits steering into the active turn
    *   (idle falls back to a woken `next-turn`).
@@ -494,10 +492,10 @@ abstract class Agent {
    * Attached contexts share the same snapshot and ownership boundary. Invalid
    * input throws synchronously before any notification, enqueue, or append.
    * @param content - the model-facing content blocks to deliver.
-   * @param options - target queue, wakeup decision, source, and contexts.
+   * @param options - target queue, wakeup decision, and source.
    * @returns the accepted message's {@link AgentMessageId}, stable across its `agent/inbox/*` events.
    */
-  abstract send(content: ContentBlock[], options?: SendOptions): AgentMessageId
+  abstract send(content: ContentBlock[], options: SendOptions): AgentMessageId
 
   /**
    * Clear queued and steering work — unless `keepInbox` — and abort the active
diff --git a/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl b/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
index e9c30f3e65..cdbe2e4bd1 100644
--- a/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
@@ -11,7 +11,7 @@
 {"type":"assistant/chunk","seq":9,"time":1783951000009,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
 {"type":"assistant/message","seq":10,"time":1784449176722,"data":{"turn":1,"step":1,"content":[{"type":"tool-call","id":"inspect-tools-api","name":"cordis_inspect","arguments":"{\"what\":\"api\",\"name\":\"tools\"}"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[5,6,7,8,9],"surfaceOp":"append"}
 {"type":"tool/call","seq":11,"time":1784449176722,"data":{"turn":1,"step":1,"callId":"inspect-tools-api","name":"cordis_inspect","arguments":"{\"what\":\"api\",\"name\":\"tools\"}"}}
-{"type":"tool/result","seq":12,"time":1784449176732,"data":{"turn":1,"step":1,"callId":"inspect-tools-api","content":[{"type":"text","text":"## api\n- tools — Tool registry and execution pipeline.\n    /**\n     * Register globally or in the calling agent scope. Scoped tools shadow\n     * globals; duplicates within one layer and the reserved `run_code` name fail.\n     * @param definition - tool schema, execution, and optional finalization/presentation callbacks.\n     * @returns the exact disposer that unregisters the tool.\n     */\n    register(definition: ToolDefinition): () => void\n    /**\n     * Restrict global tools for the calling agent scope. Empty filters, unknown\n     * names, scope-local names, and reserved transport names fail. Restrictions\n     * intersect; scoped registrations remain visible.\n     * @param filter - global-surface mask: `allow` (keep only) and/or `deny` (remove).\n     * @returns the exact disposer that lifts this restriction.\n     */\n    restrict(filter: ToolRestriction): () => void\n    /**\n     * Register a monotonic guard after the extensible `tools/pre-execute`\n     * waterfall. A plain-context guard applies globally; one registered through\n     * `agent.ctx` applies only to that agent. Any matching guard may deny by\n     * returning a reason, while no guard can force-allow a call another guard\n     * denied. The exact effect disposer is returned for ordered ownership and\n     * HMR cleanup.\n     * @param guard - synchronous check; a returned string denies the execution.\n     * @returns the exact disposer that unregisters the guard.\n     */\n    guard(guard: ToolGuard): () => void\n    /**\n     * Look up a tool as one scope sees it (scoped\n     * shadows global; a restricted-away global reads as absent). Presenters pass\n     * the calling agent so the rendered card matches the definition that\n     * actually executed.\n     * @param name - the tool name as registered.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns the definition the scope resolves, or undefined when none is visible.\n     */\n    get(name: string, scope?: ScopeKey): ToolDefinition | undefined\n    /**\n     * Project visible definitions onto the allowlisted model-facing schema fields,\n     * excluding execution and presentation callbacks.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns one deep-cloned schema per visible tool.\n     */\n    schemas(scope?: ScopeKey): ToolSchema[]\n    /**\n     * Classify a pending call through the caller's visible tool definition. Only\n     * an exact `true` is parallel; unknown, hidden, undeclared, invalid, or\n     * throwing classifiers are exclusive.\n     * @param exec - call name, parsed arguments, and optional agent scope.\n     * @returns the fail-closed scheduling mode.\n     */\n    executionMode(exec: ToolExecutionInput): ToolExecutionMode\n    /**\n     * Execute through pre-policy, guards, around-dispatch, post-policy,\n     * definition-owned content finalization, and final notification. Tool and\n     * listener failures resolve as materialized error results; an invisible tool\n     * reports `UNKNOWN_TOOL`. The returned outcome is the same lossless, frozen\n     * snapshot final observers receive. Cancellation\n     * arriving after entry and before final result materialization skips a\n     * not-yet-started body with `ABORTED_BEFORE_DISPATCH` or replaces a\n     * successful started outcome with `ABORTED`; already-started work is still\n     * drained and may retain a tool-owned structured error.\n     * @param exec - the typed same-process call input. The registry assigns its\n     *   correlation token before policy begins.\n     * @returns the materialized final result.\n     */\n    async execute(exec: ToolExecutionInput): Promise<ToolExecutionResult>\ntype shapes (referenced by the signatures above — read these before assuming a field is a string):\n    export type AdditionalContext = UserMessageData;\n    export abstract class Agent {\n        abstract readonly id: SessionId;\n        abstract readonly options: AgentOptions;\n        abstract readonly session: Session;\n        abstract readonly status: AgentStatus;\n        abstract readonly ctx: Context;\n        abstract send(content: ContentBlock[], options?: SendOptions): AgentMessageId;\n        abstract cancel(cause: AgentCancelCause, options?: CancelOptions): void;\n        abstract whenIdle(): Promise<void>;\n        followup(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        steer(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        inject(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        abstract retry(): void;\n    }\n    export type AgentCancelCause = {\n        readonly kind: 'user';\n    } | {\n        readonly kind: 'parent';\n    };\n    export type AgentMessageId = Branded<'AgentMessageId'>;\n    export interface AgentOptions {\n        provider?: string;\n        model?: string;\n    }\n    export type AgentStatus = 'idle' | 'running';\n    export interface AliasSendOptions {\n        source?: MessageSource;\n    }\n    export interface AssistantProvenance {\n        provider: string;\n        model: string;\n        replayState?: unknown;\n    }\n    export type Branded<B extends string> = string & {\n        readonly [BRAND]: B;\n    };\n    export type CallId = Branded<'CallId'>;\n    export interface CancelOptions {\n        keepInbox?: boolean;\n    }\n    export interface ContentBlockMap {\n        'text': TextBlock;\n        'reasoning': ReasoningBlock;\n        'tool-call': ToolCallBlock;\n        'tool-result': ToolResultBlock;\n    }\n    export type ContentBlockType = keyof ContentBlockMap;\n    export interface DiffCallView {\n        card: 'diff';\n        title: string;\n        diffs: FileDiff[];\n        locations?: FileLocation[];\n    }\n    export interface DiffResultView {\n        card: 'diff';\n        title?: string;\n        diffs: FileDiff[];\n    }\n    export interface EpochHeader {\n        config: LlmCallConfig;\n        system?: string;\n        tools?: ToolSchema[];\n        messagePrefix?: Message[];\n    }\n    export interface FileDiff {\n        path: string;\n        oldText: string | null;\n        newText: string;\n    }\n    export interface FileLocation {\n        path: string;\n        line?: number;\n    }\n    export type FinishReason = FinishReasonMap[keyof FinishReasonMap];\n    export interface FinishReasonMap {\n        'stop': {\n            kind: 'stop';\n        };\n        'tool-calls': {\n            kind: 'tool-calls';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        'aborted': {\n            kind: 'aborted';\n            failure: LlmFailure;\n        };\n        'error': {\n            kind: 'error';\n            failure: LlmFailure;\n        };\n    }\n    export interface GenericCallView {\n        card: 'generic';\n        title: string;\n        kind?: ToolCallKind;\n        rawInput?: unknown;\n        content?: ContentBlock[];\n        locations?: FileLocation[];\n    }\n    export interface GenericResultView {\n        card: 'generic';\n        title?: string;\n        content?: ContentBlock[];\n    }\n    export interface JsonSchemaNode {\n        type?: JsonSchemaType;\n        oneOf?: JsonSchemaNode[];\n        properties?: Record<string, JsonSchemaNode>;\n        required?: string[];\n        additionalProperties?: boolean;\n        items?: JsonSchemaNode;\n        enum?: JsonSchemaScalar[];\n        const?: JsonSchemaScalar;\n        description?: string;\n        title?: string;\n        default?: JsonValue;\n        examples?: JsonValue;\n    }\n    export type JsonSchemaScalar = string | number | boolean | null;\n    export type JsonSchemaType = 'object' | 'array' | 'string' | 'number' | 'integer' | 'boolean' | 'null';\n    export type JsonValue = null | boolean | number | string | JsonValue[] | {\n        [key: string]: JsonValue;\n    };\n    export interface LlmCallConfig {\n        provider: string;\n        model: string;\n        temperature?: number;\n        maxTokens?: number;\n        stop?: string[];\n    }\n    export interface LlmFailure {\n        readonly message: string;\n        readonly code: string;\n        readonly status?: number;\n        readonly providerRetryAfterMs?: number;\n        readonly requestId?: ProviderRequestId;\n    }\n    export interface Message {\n        role: 'system' | 'user' | 'assistant';\n        content: ContentBlock[];\n        provenance?: AssistantProvenance;\n    }\n    export type MessageSource = MessageSourceMap[keyof MessageSourceMap];\n    export interface MessageSourceMap {\n        user: {\n            kind: 'user';\n        };\n        plugin: {\n            kind: 'plugin';\n            plugin: string;\n        };\n    }\n    export type ProviderRequestId = Branded<'ProviderRequestId'>;\n    export interface ReasoningBlock {\n        type: 'reasoning';\n        text: string;\n    }\n    export type RequestHeaderReason = 'initial' | 'resume' | 'change';\n    export type ScopeKey = object;\n    export interface SendOptions {\n        target: SendTarget;\n        wakeup: boolean;\n        source: MessageSource;\n    }\n    export type SendTarget = 'next-turn' | 'next-step';\n    export class Session {\n        get surface(): SessionSurface;\n        readonly header: SessionHeader;\n        get id(): SessionId;\n        constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);\n        get events(): readonly SessionEvent[];\n        get seq(): number;\n        append<T extends SessionEventType>(type: T, data: SessionEventMap[T], ...opts: T extends SurfaceEventType ? [\n            opts: SurfaceIntent\n        ] : [\n        ]): SessionEvent<T>;\n        requestHeader(): EpochHeader | undefined;\n        deriveMessages(): Message[];\n        deriveEventMessage(event: SessionEvent): Message | null;\n    }\n    export type SessionEvent<T extends SessionEventType = SessionEventType> = {\n        [K in SessionEventType]: {\n            type: K;\n            seq: number;\n            time: number;\n            data: SessionEventMap[K];\n        } & (K extends SurfaceEventType ? {\n            sourceEventSeqs?: number[];\n            surfaceOp?: SurfaceOp;\n        } : object);\n    }[T];\n    export interface SessionEventMap {\n        'turn/start': {\n            turn: number;\n            trigger: TurnTrigger;\n        };\n        'turn/end': {\n            turn: number;\n            reason: TurnEndReason;\n        };\n        'step/start': {\n            turn: number;\n            step: number;\n        };\n        'step/end': {\n            turn: number;\n            step: number;\n        };\n        'user/message': UserMessageData;\n        'prompt/blocked': {\n            content: ContentBlock[];\n            source: MessageSource;\n            reason: string;\n        };\n        'assistant/chunk': {\n            turn: number;\n            step: number;\n            chunk: StreamChunk;\n        };\n        'assistant/message': {\n            turn: number;\n            step: number;\n            content: ContentBlock[];\n            provenance: AssistantProvenance;\n            usage?: TokenUsage;\n        };\n        'tool/call': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            name: string;\n            arguments: string;\n        };\n        'tool/result': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            content: ContentBlock[];\n            isError: boolean;\n            error?: {\n                name: string;\n                code: string;\n            };\n            meta?: JsonValue;\n        };\n        'steering/message': UserMessageData & {\n            turn: number;\n        };\n        'todo/write': {\n            todos: TodoItem[];\n        };\n        'request/header': {\n            header: EpochHeader;\n            reason: RequestHeaderReason;\n        };\n    }\n    export type SessionEventType = keyof SessionEventMap;\n    export interface SessionHeader {\n        readonly version: number;\n        readonly id: SessionId;\n        readonly createdAt: number;\n        readonly cwd?: string;\n        readonly parentSession?: SessionId;\n        readonly seedLength?: number;\n        readonly delegationDepth?: number;\n    }\n    export type SessionId = Branded<'SessionId'>;\n    export interface SessionSurface {\n        readonly nodes: readonly number[];\n        readonly replaceGeneration: number;\n    }\n    export type StreamChunk = {\n        type: 'block-start';\n        index: number;\n        blockType: ContentBlockType;\n    } | {\n        type: 'text-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'reasoning-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'tool-call-delta';\n        index: number;\n        id: CallId;\n        name?: string;\n        argumentsDelta: string;\n    } | {\n        type: 'block-end';\n        index: number;\n        block: ContentBlock;\n    } | {\n        type: 'usage';\n        usage: TokenUsage;\n    } | {\n        type: 'finish';\n        reason: FinishReason;\n        replayState?: unknown;\n    };\n    export type SurfaceEventType = 'user/message' | 'assistant/message' | 'tool/result' | 'steering/message';\n    export interface SurfaceIntent {\n        surfaceOp: SurfaceOp;\n        sourceEventSeqs?: number[];\n    }\n    export type SurfaceOp = 'append' | {\n        op: 'replace';\n        start: number;\n        end: number;\n    };\n    export interface TerminalCallView {\n        card: 'terminal';\n        title: string;\n        description?: string;\n        cwd?: string;\n    }\n    export interface TerminalResultView {\n        card: 'terminal';\n        title?: string;\n        output?: string;\n        exitCode?: number;\n        signal?: string;\n    }\n    export interface TodoItem {\n        content: string;\n        status: 'pending' | 'in_progress' | 'completed';\n    }\n    export interface TokenUsage {\n        inputTokens: number;\n        outputTokens: number;\n        cacheReadTokens?: number;\n        cacheWriteTokens?: number;\n        reasoningTokens?: number;\n    }\n    export interface ToolCallBlock {\n        type: 'tool-call';\n        id: CallId;\n        name: string;\n        arguments: string;\n    }\n    export type ToolCallKind = 'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other';\n    export type ToolCallView = GenericCallView | TerminalCallView | DiffCallView;\n    export interface ToolDefinition extends ToolSchema {\n        readonly output: ToolOutputDefinition;\n        execute(args: unknown, exec: ToolRunContext): Promise<unknown>;\n        finalizeContent?(exec: Readonly<ToolExecution>, result: Readonly<ToolExecutionResult>): ContentBlock[] | undefined;\n        timeoutMs?: number;\n        isConcurrencySafe?(args: unknown): boolean;\n        presentCall?(args: unknown): ToolCallView | undefined;\n        presentResult?(args: unknown, result: ToolResult): ToolResultView | undefined;\n    }\n    export interface ToolErrorInfo {\n        name: string;\n        code: string;\n    }\n    export interface ToolExecution extends ToolExecutionInput {\n        readonly token: ToolExecutionToken;\n    }\n    export interface ToolExecutionFailure {\n        readonly isError: true;\n        readonly error: ToolFailure;\n        readonly value?: never;\n        readonly content: ContentBlock[];\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: never;\n    }\n    export interface ToolExecutionInput {\n        readonly callId: CallId;\n        readonly name: string;\n        readonly arguments: unknown;\n        readonly agent?: Agent;\n        readonly parent?: ToolExecutionToken;\n        readonly signal: AbortSignal;\n    }\n    export type ToolExecutionMode = {\n        kind: 'parallel';\n    } | {\n        kind: 'exclusive';\n    };\n    export type ToolExecutionResult = ToolExecutionSuccess | ToolExecutionFailure;\n    export interface ToolExecutionSuccess {\n        readonly isError: false;\n        readonly value: JsonValue;\n        readonly content: ContentBlock[];\n        readonly error?: never;\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: true;\n    }\n    export type ToolExecutionToken = symbol & {\n        readonly [toolExecutionTokenBrand]: true;\n    };\n    export interface ToolFailure {\n        message: string;\n        info?: ToolErrorInfo;\n    }\n    export type ToolGuard = (execution: Readonly<ToolExecution>) => string | undefined;\n    export interface ToolOutputDefinition {\n        readonly schema: JsonSchemaNode;\n        render(args: unknown, value: JsonValue): ContentBlock[];\n        presentationMeta?(args: unknown, value: JsonValue): JsonValue;\n    }\n    export interface ToolRestriction {\n        readonly allow?: readonly string[];\n        readonly deny?: readonly string[];\n    }\n    export interface ToolResult {\n        content: ContentBlock[];\n        isError: boolean;\n        meta?: JsonValue;\n    }\n    export interface ToolResultBlock {\n        type: 'tool-result';\n        toolCallId: CallId;\n        content: ContentBlock[];\n        isError?: boolean;\n    }\n    export type ToolResultView = GenericResultView | TerminalResultView | DiffResultView;\n    export interface ToolRunContext extends ToolExecution {\n        deferContext(context: AdditionalContext): void;\n        concludeTurn(): void;\n    }\n    export interface ToolSchema {\n        name: string;\n        description: string;\n        parameters: Record<string, unknown>;\n    }\n    export type TurnEndReason = TurnEndReasonMap[keyof TurnEndReasonMap];\n    export interface TurnEndReasonMap {\n        completed: {\n            kind: 'completed';\n        };\n        aborted: {\n            kind: 'aborted';\n        };\n        error: {\n            kind: 'error';\n            step: number;\n        } & ({\n            failure: LlmFailure;\n            message?: never;\n            code?: never;\n        } | {\n            message: string;\n            code?: string;\n            failure?: never;\n        });\n        disposed: {\n            kind: 'disposed';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        rejected: {\n            kind: 'rejected';\n            reason: string;\n        };\n        interrupted: {\n            kind: 'interrupted';\n        };\n    }\n    export type TurnTrigger = TurnTriggerMap[keyof TurnTriggerMap];\n    export interface TurnTriggerMap {\n        message: {\n            kind: 'message';\n            source: MessageSource;\n        };\n        retry: {\n            kind: 'retry';\n        };\n        injection: {\n            kind: 'injection';\n            source: MessageSource;\n        };\n    }\n    export interface UserMessageData {\n        content: ContentBlock[];\n        source: MessageSource;\n    }"}],"isError":false},"sourceEventSeqs":[11],"surfaceOp":"append"}
+{"type":"tool/result","seq":12,"time":1784449176732,"data":{"turn":1,"step":1,"callId":"inspect-tools-api","content":[{"type":"text","text":"## api\n- tools — Tool registry and execution pipeline.\n    /**\n     * Register globally or in the calling agent scope. Scoped tools shadow\n     * globals; duplicates within one layer and the reserved `run_code` name fail.\n     * @param definition - tool schema, execution, and optional finalization/presentation callbacks.\n     * @returns the exact disposer that unregisters the tool.\n     */\n    register(definition: ToolDefinition): () => void\n    /**\n     * Restrict global tools for the calling agent scope. Empty filters, unknown\n     * names, scope-local names, and reserved transport names fail. Restrictions\n     * intersect; scoped registrations remain visible.\n     * @param filter - global-surface mask: `allow` (keep only) and/or `deny` (remove).\n     * @returns the exact disposer that lifts this restriction.\n     */\n    restrict(filter: ToolRestriction): () => void\n    /**\n     * Register a monotonic guard after the extensible `tools/pre-execute`\n     * waterfall. A plain-context guard applies globally; one registered through\n     * `agent.ctx` applies only to that agent. Any matching guard may deny by\n     * returning a reason, while no guard can force-allow a call another guard\n     * denied. The exact effect disposer is returned for ordered ownership and\n     * HMR cleanup.\n     * @param guard - synchronous check; a returned string denies the execution.\n     * @returns the exact disposer that unregisters the guard.\n     */\n    guard(guard: ToolGuard): () => void\n    /**\n     * Look up a tool as one scope sees it (scoped\n     * shadows global; a restricted-away global reads as absent). Presenters pass\n     * the calling agent so the rendered card matches the definition that\n     * actually executed.\n     * @param name - the tool name as registered.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns the definition the scope resolves, or undefined when none is visible.\n     */\n    get(name: string, scope?: ScopeKey): ToolDefinition | undefined\n    /**\n     * Project visible definitions onto the allowlisted model-facing schema fields,\n     * excluding execution and presentation callbacks.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns one deep-cloned schema per visible tool.\n     */\n    schemas(scope?: ScopeKey): ToolSchema[]\n    /**\n     * Classify a pending call through the caller's visible tool definition. Only\n     * an exact `true` is parallel; unknown, hidden, undeclared, invalid, or\n     * throwing classifiers are exclusive.\n     * @param exec - call name, parsed arguments, and optional agent scope.\n     * @returns the fail-closed scheduling mode.\n     */\n    executionMode(exec: ToolExecutionInput): ToolExecutionMode\n    /**\n     * Execute through pre-policy, guards, around-dispatch, post-policy,\n     * definition-owned content finalization, and final notification. Tool and\n     * listener failures resolve as materialized error results; an invisible tool\n     * reports `UNKNOWN_TOOL`. The returned outcome is the same lossless, frozen\n     * snapshot final observers receive. Cancellation\n     * arriving after entry and before final result materialization skips a\n     * not-yet-started body with `ABORTED_BEFORE_DISPATCH` or replaces a\n     * successful started outcome with `ABORTED`; already-started work is still\n     * drained and may retain a tool-owned structured error.\n     * @param exec - the typed same-process call input. The registry assigns its\n     *   correlation token before policy begins.\n     * @returns the materialized final result.\n     */\n    async execute(exec: ToolExecutionInput): Promise<ToolExecutionResult>\ntype shapes (referenced by the signatures above — read these before assuming a field is a string):\n    export type AdditionalContext = UserMessageData;\n    export abstract class Agent {\n        abstract readonly id: SessionId;\n        abstract readonly options: AgentOptions;\n        abstract readonly session: Session;\n        abstract readonly status: AgentStatus;\n        abstract readonly ctx: Context;\n        abstract send(content: ContentBlock[], options: SendOptions): AgentMessageId;\n        abstract cancel(cause: AgentCancelCause, options?: CancelOptions): void;\n        abstract whenIdle(): Promise<void>;\n        followup(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        steer(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        inject(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        abstract retry(): void;\n    }\n    export type AgentCancelCause = {\n        readonly kind: 'user';\n    } | {\n        readonly kind: 'parent';\n    };\n    export type AgentMessageId = Branded<'AgentMessageId'>;\n    export interface AgentOptions {\n        provider?: string;\n        model?: string;\n    }\n    export type AgentStatus = 'idle' | 'running';\n    export interface AliasSendOptions {\n        source?: MessageSource;\n    }\n    export interface AssistantProvenance {\n        provider: string;\n        model: string;\n        replayState?: unknown;\n    }\n    export type Branded<B extends string> = string & {\n        readonly [BRAND]: B;\n    };\n    export type CallId = Branded<'CallId'>;\n    export interface CancelOptions {\n        keepInbox?: boolean;\n    }\n    export interface ContentBlockMap {\n        'text': TextBlock;\n        'reasoning': ReasoningBlock;\n        'tool-call': ToolCallBlock;\n        'tool-result': ToolResultBlock;\n    }\n    export type ContentBlockType = keyof ContentBlockMap;\n    export interface DiffCallView {\n        card: 'diff';\n        title: string;\n        diffs: FileDiff[];\n        locations?: FileLocation[];\n    }\n    export interface DiffResultView {\n        card: 'diff';\n        title?: string;\n        diffs: FileDiff[];\n    }\n    export interface EpochHeader {\n        config: LlmCallConfig;\n        system?: string;\n        tools?: ToolSchema[];\n        messagePrefix?: Message[];\n    }\n    export interface FileDiff {\n        path: string;\n        oldText: string | null;\n        newText: string;\n    }\n    export interface FileLocation {\n        path: string;\n        line?: number;\n    }\n    export type FinishReason = FinishReasonMap[keyof FinishReasonMap];\n    export interface FinishReasonMap {\n        'stop': {\n            kind: 'stop';\n        };\n        'tool-calls': {\n            kind: 'tool-calls';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        'aborted': {\n            kind: 'aborted';\n            failure: LlmFailure;\n        };\n        'error': {\n            kind: 'error';\n            failure: LlmFailure;\n        };\n    }\n    export interface GenericCallView {\n        card: 'generic';\n        title: string;\n        kind?: ToolCallKind;\n        rawInput?: unknown;\n        content?: ContentBlock[];\n        locations?: FileLocation[];\n    }\n    export interface GenericResultView {\n        card: 'generic';\n        title?: string;\n        content?: ContentBlock[];\n    }\n    export interface JsonSchemaNode {\n        type?: JsonSchemaType;\n        oneOf?: JsonSchemaNode[];\n        properties?: Record<string, JsonSchemaNode>;\n        required?: string[];\n        additionalProperties?: boolean;\n        items?: JsonSchemaNode;\n        enum?: JsonSchemaScalar[];\n        const?: JsonSchemaScalar;\n        description?: string;\n        title?: string;\n        default?: JsonValue;\n        examples?: JsonValue;\n    }\n    export type JsonSchemaScalar = string | number | boolean | null;\n    export type JsonSchemaType = 'object' | 'array' | 'string' | 'number' | 'integer' | 'boolean' | 'null';\n    export type JsonValue = null | boolean | number | string | JsonValue[] | {\n        [key: string]: JsonValue;\n    };\n    export interface LlmCallConfig {\n        provider: string;\n        model: string;\n        temperature?: number;\n        maxTokens?: number;\n        stop?: string[];\n    }\n    export interface LlmFailure {\n        readonly message: string;\n        readonly code: string;\n        readonly status?: number;\n        readonly providerRetryAfterMs?: number;\n        readonly requestId?: ProviderRequestId;\n    }\n    export interface Message {\n        role: 'system' | 'user' | 'assistant';\n        content: ContentBlock[];\n        provenance?: AssistantProvenance;\n    }\n    export type MessageSource = MessageSourceMap[keyof MessageSourceMap];\n    export interface MessageSourceMap {\n        user: {\n            kind: 'user';\n        };\n        plugin: {\n            kind: 'plugin';\n            plugin: string;\n        };\n    }\n    export type ProviderRequestId = Branded<'ProviderRequestId'>;\n    export interface ReasoningBlock {\n        type: 'reasoning';\n        text: string;\n    }\n    export type RequestHeaderReason = 'initial' | 'resume' | 'change';\n    export type ScopeKey = object;\n    export interface SendOptions {\n        target: SendTarget;\n        wakeup: boolean;\n        source: MessageSource;\n    }\n    export type SendTarget = 'next-turn' | 'next-step';\n    export class Session {\n        get surface(): SessionSurface;\n        readonly header: SessionHeader;\n        get id(): SessionId;\n        constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);\n        get events(): readonly SessionEvent[];\n        get seq(): number;\n        append<T extends SessionEventType>(type: T, data: SessionEventMap[T], ...opts: T extends SurfaceEventType ? [\n            opts: SurfaceIntent\n        ] : [\n        ]): SessionEvent<T>;\n        requestHeader(): EpochHeader | undefined;\n        deriveMessages(): Message[];\n        deriveEventMessage(event: SessionEvent): Message | null;\n    }\n    export type SessionEvent<T extends SessionEventType = SessionEventType> = {\n        [K in SessionEventType]: {\n            type: K;\n            seq: number;\n            time: number;\n            data: SessionEventMap[K];\n        } & (K extends SurfaceEventType ? {\n            sourceEventSeqs?: number[];\n            surfaceOp?: SurfaceOp;\n        } : object);\n    }[T];\n    export interface SessionEventMap {\n        'turn/start': {\n            turn: number;\n            trigger: TurnTrigger;\n        };\n        'turn/end': {\n            turn: number;\n            reason: TurnEndReason;\n        };\n        'step/start': {\n            turn: number;\n            step: number;\n        };\n        'step/end': {\n            turn: number;\n            step: number;\n        };\n        'user/message': UserMessageData;\n        'prompt/blocked': {\n            content: ContentBlock[];\n            source: MessageSource;\n            reason: string;\n        };\n        'assistant/chunk': {\n            turn: number;\n            step: number;\n            chunk: StreamChunk;\n        };\n        'assistant/message': {\n            turn: number;\n            step: number;\n            content: ContentBlock[];\n            provenance: AssistantProvenance;\n            usage?: TokenUsage;\n        };\n        'tool/call': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            name: string;\n            arguments: string;\n        };\n        'tool/result': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            content: ContentBlock[];\n            isError: boolean;\n            error?: {\n                name: string;\n                code: string;\n            };\n            meta?: JsonValue;\n        };\n        'steering/message': UserMessageData & {\n            turn: number;\n        };\n        'todo/write': {\n            todos: TodoItem[];\n        };\n        'request/header': {\n            header: EpochHeader;\n            reason: RequestHeaderReason;\n        };\n    }\n    export type SessionEventType = keyof SessionEventMap;\n    export interface SessionHeader {\n        readonly version: number;\n        readonly id: SessionId;\n        readonly createdAt: number;\n        readonly cwd?: string;\n        readonly parentSession?: SessionId;\n        readonly seedLength?: number;\n        readonly delegationDepth?: number;\n    }\n    export type SessionId = Branded<'SessionId'>;\n    export interface SessionSurface {\n        readonly nodes: readonly number[];\n        readonly replaceGeneration: number;\n    }\n    export type StreamChunk = {\n        type: 'block-start';\n        index: number;\n        blockType: ContentBlockType;\n    } | {\n        type: 'text-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'reasoning-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'tool-call-delta';\n        index: number;\n        id: CallId;\n        name?: string;\n        argumentsDelta: string;\n    } | {\n        type: 'block-end';\n        index: number;\n        block: ContentBlock;\n    } | {\n        type: 'usage';\n        usage: TokenUsage;\n    } | {\n        type: 'finish';\n        reason: FinishReason;\n        replayState?: unknown;\n    };\n    export type SurfaceEventType = 'user/message' | 'assistant/message' | 'tool/result' | 'steering/message';\n    export interface SurfaceIntent {\n        surfaceOp: SurfaceOp;\n        sourceEventSeqs?: number[];\n    }\n    export type SurfaceOp = 'append' | {\n        op: 'replace';\n        start: number;\n        end: number;\n    };\n    export interface TerminalCallView {\n        card: 'terminal';\n        title: string;\n        description?: string;\n        cwd?: string;\n    }\n    export interface TerminalResultView {\n        card: 'terminal';\n        title?: string;\n        output?: string;\n        exitCode?: number;\n        signal?: string;\n    }\n    export interface TodoItem {\n        content: string;\n        status: 'pending' | 'in_progress' | 'completed';\n    }\n    export interface TokenUsage {\n        inputTokens: number;\n        outputTokens: number;\n        cacheReadTokens?: number;\n        cacheWriteTokens?: number;\n        reasoningTokens?: number;\n    }\n    export interface ToolCallBlock {\n        type: 'tool-call';\n        id: CallId;\n        name: string;\n        arguments: string;\n    }\n    export type ToolCallKind = 'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other';\n    export type ToolCallView = GenericCallView | TerminalCallView | DiffCallView;\n    export interface ToolDefinition extends ToolSchema {\n        readonly output: ToolOutputDefinition;\n        execute(args: unknown, exec: ToolRunContext): Promise<unknown>;\n        finalizeContent?(exec: Readonly<ToolExecution>, result: Readonly<ToolExecutionResult>): ContentBlock[] | undefined;\n        timeoutMs?: number;\n        isConcurrencySafe?(args: unknown): boolean;\n        presentCall?(args: unknown): ToolCallView | undefined;\n        presentResult?(args: unknown, result: ToolResult): ToolResultView | undefined;\n    }\n    export interface ToolErrorInfo {\n        name: string;\n        code: string;\n    }\n    export interface ToolExecution extends ToolExecutionInput {\n        readonly token: ToolExecutionToken;\n    }\n    export interface ToolExecutionFailure {\n        readonly isError: true;\n        readonly error: ToolFailure;\n        readonly value?: never;\n        readonly content: ContentBlock[];\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: never;\n    }\n    export interface ToolExecutionInput {\n        readonly callId: CallId;\n        readonly name: string;\n        readonly arguments: unknown;\n        readonly agent?: Agent;\n        readonly parent?: ToolExecutionToken;\n        readonly signal: AbortSignal;\n    }\n    export type ToolExecutionMode = {\n        kind: 'parallel';\n    } | {\n        kind: 'exclusive';\n    };\n    export type ToolExecutionResult = ToolExecutionSuccess | ToolExecutionFailure;\n    export interface ToolExecutionSuccess {\n        readonly isError: false;\n        readonly value: JsonValue;\n        readonly content: ContentBlock[];\n        readonly error?: never;\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: true;\n    }\n    export type ToolExecutionToken = symbol & {\n        readonly [toolExecutionTokenBrand]: true;\n    };\n    export interface ToolFailure {\n        message: string;\n        info?: ToolErrorInfo;\n    }\n    export type ToolGuard = (execution: Readonly<ToolExecution>) => string | undefined;\n    export interface ToolOutputDefinition {\n        readonly schema: JsonSchemaNode;\n        render(args: unknown, value: JsonValue): ContentBlock[];\n        presentationMeta?(args: unknown, value: JsonValue): JsonValue;\n    }\n    export interface ToolRestriction {\n        readonly allow?: readonly string[];\n        readonly deny?: readonly string[];\n    }\n    export interface ToolResult {\n        content: ContentBlock[];\n        isError: boolean;\n        meta?: JsonValue;\n    }\n    export interface ToolResultBlock {\n        type: 'tool-result';\n        toolCallId: CallId;\n        content: ContentBlock[];\n        isError?: boolean;\n    }\n    export type ToolResultView = GenericResultView | TerminalResultView | DiffResultView;\n    export interface ToolRunContext extends ToolExecution {\n        deferContext(context: AdditionalContext): void;\n        concludeTurn(): void;\n    }\n    export interface ToolSchema {\n        name: string;\n        description: string;\n        parameters: Record<string, unknown>;\n    }\n    export type TurnEndReason = TurnEndReasonMap[keyof TurnEndReasonMap];\n    export interface TurnEndReasonMap {\n        completed: {\n            kind: 'completed';\n        };\n        aborted: {\n            kind: 'aborted';\n        };\n        error: {\n            kind: 'error';\n            step: number;\n        } & ({\n            failure: LlmFailure;\n            message?: never;\n            code?: never;\n        } | {\n            message: string;\n            code?: string;\n            failure?: never;\n        });\n        disposed: {\n            kind: 'disposed';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        rejected: {\n            kind: 'rejected';\n            reason: string;\n        };\n        interrupted: {\n            kind: 'interrupted';\n        };\n    }\n    export type TurnTrigger = TurnTriggerMap[keyof TurnTriggerMap];\n    export interface TurnTriggerMap {\n        message: {\n            kind: 'message';\n            source: MessageSource;\n        };\n        retry: {\n            kind: 'retry';\n        };\n        injection: {\n            kind: 'injection';\n            source: MessageSource;\n        };\n    }\n    export interface UserMessageData {\n        content: ContentBlock[];\n        source: MessageSource;\n    }"}],"isError":false},"sourceEventSeqs":[11],"surfaceOp":"append"}
 {"type":"step/end","seq":13,"time":1784449176732,"data":{"turn":1,"step":1}}
 {"type":"step/start","seq":14,"time":1784449176733,"data":{"turn":1,"step":2}}
 {"type":"assistant/chunk","seq":15,"time":1783951000015,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
diff --git a/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/stdout.expected.jsonl b/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/stdout.expected.jsonl
index d3d5c1f5d9..df0b9c9c96 100644
--- a/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/stdout.expected.jsonl
+++ b/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/stdout.expected.jsonl
@@ -3,7 +3,7 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"available_commands_update","availableCommands":[{"name":"goal","description":"set or view the goal for a long-running task","input":{"hint":"[<objective>|clear|edit <objective>|pause|resume]"}},{"name":"plan","description":"Enter or leave plan mode","input":{"hint":"[off|message]"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"session_info_update","title":"Inspect the exact tools service","updatedAt":"{{updatedAt}}"}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"inspect-tools-api","title":"Inspect cordis runtime: api: tools","kind":"read","status":"in_progress"}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"inspect-tools-api","status":"completed","content":[{"type":"content","content":{"type":"text","text":"## api\n- tools — Tool registry and execution pipeline.\n    /**\n     * Register globally or in the calling agent scope. Scoped tools shadow\n     * globals; duplicates within one layer and the reserved `run_code` name fail.\n     * @param definition - tool schema, execution, and optional finalization/presentation callbacks.\n     * @returns the exact disposer that unregisters the tool.\n     */\n    register(definition: ToolDefinition): () => void\n    /**\n     * Restrict global tools for the calling agent scope. Empty filters, unknown\n     * names, scope-local names, and reserved transport names fail. Restrictions\n     * intersect; scoped registrations remain visible.\n     * @param filter - global-surface mask: `allow` (keep only) and/or `deny` (remove).\n     * @returns the exact disposer that lifts this restriction.\n     */\n    restrict(filter: ToolRestriction): () => void\n    /**\n     * Register a monotonic guard after the extensible `tools/pre-execute`\n     * waterfall. A plain-context guard applies globally; one registered through\n     * `agent.ctx` applies only to that agent. Any matching guard may deny by\n     * returning a reason, while no guard can force-allow a call another guard\n     * denied. The exact effect disposer is returned for ordered ownership and\n     * HMR cleanup.\n     * @param guard - synchronous check; a returned string denies the execution.\n     * @returns the exact disposer that unregisters the guard.\n     */\n    guard(guard: ToolGuard): () => void\n    /**\n     * Look up a tool as one scope sees it (scoped\n     * shadows global; a restricted-away global reads as absent). Presenters pass\n     * the calling agent so the rendered card matches the definition that\n     * actually executed.\n     * @param name - the tool name as registered.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns the definition the scope resolves, or undefined when none is visible.\n     */\n    get(name: string, scope?: ScopeKey): ToolDefinition | undefined\n    /**\n     * Project visible definitions onto the allowlisted model-facing schema fields,\n     * excluding execution and presentation callbacks.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns one deep-cloned schema per visible tool.\n     */\n    schemas(scope?: ScopeKey): ToolSchema[]\n    /**\n     * Classify a pending call through the caller's visible tool definition. Only\n     * an exact `true` is parallel; unknown, hidden, undeclared, invalid, or\n     * throwing classifiers are exclusive.\n     * @param exec - call name, parsed arguments, and optional agent scope.\n     * @returns the fail-closed scheduling mode.\n     */\n    executionMode(exec: ToolExecutionInput): ToolExecutionMode\n    /**\n     * Execute through pre-policy, guards, around-dispatch, post-policy,\n     * definition-owned content finalization, and final notification. Tool and\n     * listener failures resolve as materialized error results; an invisible tool\n     * reports `UNKNOWN_TOOL`. The returned outcome is the same lossless, frozen\n     * snapshot final observers receive. Cancellation\n     * arriving after entry and before final result materialization skips a\n     * not-yet-started body with `ABORTED_BEFORE_DISPATCH` or replaces a\n     * successful started outcome with `ABORTED`; already-started work is still\n     * drained and may retain a tool-owned structured error.\n     * @param exec - the typed same-process call input. The registry assigns its\n     *   correlation token before policy begins.\n     * @returns the materialized final result.\n     */\n    async execute(exec: ToolExecutionInput): Promise<ToolExecutionResult>\ntype shapes (referenced by the signatures above — read these before assuming a field is a string):\n    export type AdditionalContext = UserMessageData;\n    export abstract class Agent {\n        abstract readonly id: SessionId;\n        abstract readonly options: AgentOptions;\n        abstract readonly session: Session;\n        abstract readonly status: AgentStatus;\n        abstract readonly ctx: Context;\n        abstract send(content: ContentBlock[], options?: SendOptions): AgentMessageId;\n        abstract cancel(cause: AgentCancelCause, options?: CancelOptions): void;\n        abstract whenIdle(): Promise<void>;\n        followup(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        steer(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        inject(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        abstract retry(): void;\n    }\n    export type AgentCancelCause = {\n        readonly kind: 'user';\n    } | {\n        readonly kind: 'parent';\n    };\n    export type AgentMessageId = Branded<'AgentMessageId'>;\n    export interface AgentOptions {\n        provider?: string;\n        model?: string;\n    }\n    export type AgentStatus = 'idle' | 'running';\n    export interface AliasSendOptions {\n        source?: MessageSource;\n    }\n    export interface AssistantProvenance {\n        provider: string;\n        model: string;\n        replayState?: unknown;\n    }\n    export type Branded<B extends string> = string & {\n        readonly [BRAND]: B;\n    };\n    export type CallId = Branded<'CallId'>;\n    export interface CancelOptions {\n        keepInbox?: boolean;\n    }\n    export interface ContentBlockMap {\n        'text': TextBlock;\n        'reasoning': ReasoningBlock;\n        'tool-call': ToolCallBlock;\n        'tool-result': ToolResultBlock;\n    }\n    export type ContentBlockType = keyof ContentBlockMap;\n    export interface DiffCallView {\n        card: 'diff';\n        title: string;\n        diffs: FileDiff[];\n        locations?: FileLocation[];\n    }\n    export interface DiffResultView {\n        card: 'diff';\n        title?: string;\n        diffs: FileDiff[];\n    }\n    export interface EpochHeader {\n        config: LlmCallConfig;\n        system?: string;\n        tools?: ToolSchema[];\n        messagePrefix?: Message[];\n    }\n    export interface FileDiff {\n        path: string;\n        oldText: string | null;\n        newText: string;\n    }\n    export interface FileLocation {\n        path: string;\n        line?: number;\n    }\n    export type FinishReason = FinishReasonMap[keyof FinishReasonMap];\n    export interface FinishReasonMap {\n        'stop': {\n            kind: 'stop';\n        };\n        'tool-calls': {\n            kind: 'tool-calls';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        'aborted': {\n            kind: 'aborted';\n            failure: LlmFailure;\n        };\n        'error': {\n            kind: 'error';\n            failure: LlmFailure;\n        };\n    }\n    export interface GenericCallView {\n        card: 'generic';\n        title: string;\n        kind?: ToolCallKind;\n        rawInput?: unknown;\n        content?: ContentBlock[];\n        locations?: FileLocation[];\n    }\n    export interface GenericResultView {\n        card: 'generic';\n        title?: string;\n        content?: ContentBlock[];\n    }\n    export interface JsonSchemaNode {\n        type?: JsonSchemaType;\n        oneOf?: JsonSchemaNode[];\n        properties?: Record<string, JsonSchemaNode>;\n        required?: string[];\n        additionalProperties?: boolean;\n        items?: JsonSchemaNode;\n        enum?: JsonSchemaScalar[];\n        const?: JsonSchemaScalar;\n        description?: string;\n        title?: string;\n        default?: JsonValue;\n        examples?: JsonValue;\n    }\n    export type JsonSchemaScalar = string | number | boolean | null;\n    export type JsonSchemaType = 'object' | 'array' | 'string' | 'number' | 'integer' | 'boolean' | 'null';\n    export type JsonValue = null | boolean | number | string | JsonValue[] | {\n        [key: string]: JsonValue;\n    };\n    export interface LlmCallConfig {\n        provider: string;\n        model: string;\n        temperature?: number;\n        maxTokens?: number;\n        stop?: string[];\n    }\n    export interface LlmFailure {\n        readonly message: string;\n        readonly code: string;\n        readonly status?: number;\n        readonly providerRetryAfterMs?: number;\n        readonly requestId?: ProviderRequestId;\n    }\n    export interface Message {\n        role: 'system' | 'user' | 'assistant';\n        content: ContentBlock[];\n        provenance?: AssistantProvenance;\n    }\n    export type MessageSource = MessageSourceMap[keyof MessageSourceMap];\n    export interface MessageSourceMap {\n        user: {\n            kind: 'user';\n        };\n        plugin: {\n            kind: 'plugin';\n            plugin: string;\n        };\n    }\n    export type ProviderRequestId = Branded<'ProviderRequestId'>;\n    export interface ReasoningBlock {\n        type: 'reasoning';\n        text: string;\n    }\n    export type RequestHeaderReason = 'initial' | 'resume' | 'change';\n    export type ScopeKey = object;\n    export interface SendOptions {\n        target: SendTarget;\n        wakeup: boolean;\n        source: MessageSource;\n    }\n    export type SendTarget = 'next-turn' | 'next-step';\n    export class Session {\n        get surface(): SessionSurface;\n        readonly header: SessionHeader;\n        get id(): SessionId;\n        constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);\n        get events(): readonly SessionEvent[];\n        get seq(): number;\n        append<T extends SessionEventType>(type: T, data: SessionEventMap[T], ...opts: T extends SurfaceEventType ? [\n            opts: SurfaceIntent\n        ] : [\n        ]): SessionEvent<T>;\n        requestHeader(): EpochHeader | undefined;\n        deriveMessages(): Message[];\n        deriveEventMessage(event: SessionEvent): Message | null;\n    }\n    export type SessionEvent<T extends SessionEventType = SessionEventType> = {\n        [K in SessionEventType]: {\n            type: K;\n            seq: number;\n            time: number;\n            data: SessionEventMap[K];\n        } & (K extends SurfaceEventType ? {\n            sourceEventSeqs?: number[];\n            surfaceOp?: SurfaceOp;\n        } : object);\n    }[T];\n    export interface SessionEventMap {\n        'turn/start': {\n            turn: number;\n            trigger: TurnTrigger;\n        };\n        'turn/end': {\n            turn: number;\n            reason: TurnEndReason;\n        };\n        'step/start': {\n            turn: number;\n            step: number;\n        };\n        'step/end': {\n            turn: number;\n            step: number;\n        };\n        'user/message': UserMessageData;\n        'prompt/blocked': {\n            content: ContentBlock[];\n            source: MessageSource;\n            reason: string;\n        };\n        'assistant/chunk': {\n            turn: number;\n            step: number;\n            chunk: StreamChunk;\n        };\n        'assistant/message': {\n            turn: number;\n            step: number;\n            content: ContentBlock[];\n            provenance: AssistantProvenance;\n            usage?: TokenUsage;\n        };\n        'tool/call': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            name: string;\n            arguments: string;\n        };\n        'tool/result': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            content: ContentBlock[];\n            isError: boolean;\n            error?: {\n                name: string;\n                code: string;\n            };\n            meta?: JsonValue;\n        };\n        'steering/message': UserMessageData & {\n            turn: number;\n        };\n        'todo/write': {\n            todos: TodoItem[];\n        };\n        'request/header': {\n            header: EpochHeader;\n            reason: RequestHeaderReason;\n        };\n    }\n    export type SessionEventType = keyof SessionEventMap;\n    export interface SessionHeader {\n        readonly version: number;\n        readonly id: SessionId;\n        readonly createdAt: number;\n        readonly cwd?: string;\n        readonly parentSession?: SessionId;\n        readonly seedLength?: number;\n        readonly delegationDepth?: number;\n    }\n    export type SessionId = Branded<'SessionId'>;\n    export interface SessionSurface {\n        readonly nodes: readonly number[];\n        readonly replaceGeneration: number;\n    }\n    export type StreamChunk = {\n        type: 'block-start';\n        index: number;\n        blockType: ContentBlockType;\n    } | {\n        type: 'text-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'reasoning-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'tool-call-delta';\n        index: number;\n        id: CallId;\n        name?: string;\n        argumentsDelta: string;\n    } | {\n        type: 'block-end';\n        index: number;\n        block: ContentBlock;\n    } | {\n        type: 'usage';\n        usage: TokenUsage;\n    } | {\n        type: 'finish';\n        reason: FinishReason;\n        replayState?: unknown;\n    };\n    export type SurfaceEventType = 'user/message' | 'assistant/message' | 'tool/result' | 'steering/message';\n    export interface SurfaceIntent {\n        surfaceOp: SurfaceOp;\n        sourceEventSeqs?: number[];\n    }\n    export type SurfaceOp = 'append' | {\n        op: 'replace';\n        start: number;\n        end: number;\n    };\n    export interface TerminalCallView {\n        card: 'terminal';\n        title: string;\n        description?: string;\n        cwd?: string;\n    }\n    export interface TerminalResultView {\n        card: 'terminal';\n        title?: string;\n        output?: string;\n        exitCode?: number;\n        signal?: string;\n    }\n    export interface TodoItem {\n        content: string;\n        status: 'pending' | 'in_progress' | 'completed';\n    }\n    export interface TokenUsage {\n        inputTokens: number;\n        outputTokens: number;\n        cacheReadTokens?: number;\n        cacheWriteTokens?: number;\n        reasoningTokens?: number;\n    }\n    export interface ToolCallBlock {\n        type: 'tool-call';\n        id: CallId;\n        name: string;\n        arguments: string;\n    }\n    export type ToolCallKind = 'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other';\n    export type ToolCallView = GenericCallView | TerminalCallView | DiffCallView;\n    export interface ToolDefinition extends ToolSchema {\n        readonly output: ToolOutputDefinition;\n        execute(args: unknown, exec: ToolRunContext): Promise<unknown>;\n        finalizeContent?(exec: Readonly<ToolExecution>, result: Readonly<ToolExecutionResult>): ContentBlock[] | undefined;\n        timeoutMs?: number;\n        isConcurrencySafe?(args: unknown): boolean;\n        presentCall?(args: unknown): ToolCallView | undefined;\n        presentResult?(args: unknown, result: ToolResult): ToolResultView | undefined;\n    }\n    export interface ToolErrorInfo {\n        name: string;\n        code: string;\n    }\n    export interface ToolExecution extends ToolExecutionInput {\n        readonly token: ToolExecutionToken;\n    }\n    export interface ToolExecutionFailure {\n        readonly isError: true;\n        readonly error: ToolFailure;\n        readonly value?: never;\n        readonly content: ContentBlock[];\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: never;\n    }\n    export interface ToolExecutionInput {\n        readonly callId: CallId;\n        readonly name: string;\n        readonly arguments: unknown;\n        readonly agent?: Agent;\n        readonly parent?: ToolExecutionToken;\n        readonly signal: AbortSignal;\n    }\n    export type ToolExecutionMode = {\n        kind: 'parallel';\n    } | {\n        kind: 'exclusive';\n    };\n    export type ToolExecutionResult = ToolExecutionSuccess | ToolExecutionFailure;\n    export interface ToolExecutionSuccess {\n        readonly isError: false;\n        readonly value: JsonValue;\n        readonly content: ContentBlock[];\n        readonly error?: never;\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: true;\n    }\n    export type ToolExecutionToken = symbol & {\n        readonly [toolExecutionTokenBrand]: true;\n    };\n    export interface ToolFailure {\n        message: string;\n        info?: ToolErrorInfo;\n    }\n    export type ToolGuard = (execution: Readonly<ToolExecution>) => string | undefined;\n    export interface ToolOutputDefinition {\n        readonly schema: JsonSchemaNode;\n        render(args: unknown, value: JsonValue): ContentBlock[];\n        presentationMeta?(args: unknown, value: JsonValue): JsonValue;\n    }\n    export interface ToolRestriction {\n        readonly allow?: readonly string[];\n        readonly deny?: readonly string[];\n    }\n    export interface ToolResult {\n        content: ContentBlock[];\n        isError: boolean;\n        meta?: JsonValue;\n    }\n    export interface ToolResultBlock {\n        type: 'tool-result';\n        toolCallId: CallId;\n        content: ContentBlock[];\n        isError?: boolean;\n    }\n    export type ToolResultView = GenericResultView | TerminalResultView | DiffResultView;\n    export interface ToolRunContext extends ToolExecution {\n        deferContext(context: AdditionalContext): void;\n        concludeTurn(): void;\n    }\n    export interface ToolSchema {\n        name: string;\n        description: string;\n        parameters: Record<string, unknown>;\n    }\n    export type TurnEndReason = TurnEndReasonMap[keyof TurnEndReasonMap];\n    export interface TurnEndReasonMap {\n        completed: {\n            kind: 'completed';\n        };\n        aborted: {\n            kind: 'aborted';\n        };\n        error: {\n            kind: 'error';\n            step: number;\n        } & ({\n            failure: LlmFailure;\n            message?: never;\n            code?: never;\n        } | {\n            message: string;\n            code?: string;\n            failure?: never;\n        });\n        disposed: {\n            kind: 'disposed';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        rejected: {\n            kind: 'rejected';\n            reason: string;\n        };\n        interrupted: {\n            kind: 'interrupted';\n        };\n    }\n    export type TurnTrigger = TurnTriggerMap[keyof TurnTriggerMap];\n    export interface TurnTriggerMap {\n        message: {\n            kind: 'message';\n            source: MessageSource;\n        };\n        retry: {\n            kind: 'retry';\n        };\n        injection: {\n            kind: 'injection';\n            source: MessageSource;\n        };\n    }\n    export interface UserMessageData {\n        content: ContentBlock[];\n        source: MessageSource;\n    }"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"inspect-tools-api","status":"completed","content":[{"type":"content","content":{"type":"text","text":"## api\n- tools — Tool registry and execution pipeline.\n    /**\n     * Register globally or in the calling agent scope. Scoped tools shadow\n     * globals; duplicates within one layer and the reserved `run_code` name fail.\n     * @param definition - tool schema, execution, and optional finalization/presentation callbacks.\n     * @returns the exact disposer that unregisters the tool.\n     */\n    register(definition: ToolDefinition): () => void\n    /**\n     * Restrict global tools for the calling agent scope. Empty filters, unknown\n     * names, scope-local names, and reserved transport names fail. Restrictions\n     * intersect; scoped registrations remain visible.\n     * @param filter - global-surface mask: `allow` (keep only) and/or `deny` (remove).\n     * @returns the exact disposer that lifts this restriction.\n     */\n    restrict(filter: ToolRestriction): () => void\n    /**\n     * Register a monotonic guard after the extensible `tools/pre-execute`\n     * waterfall. A plain-context guard applies globally; one registered through\n     * `agent.ctx` applies only to that agent. Any matching guard may deny by\n     * returning a reason, while no guard can force-allow a call another guard\n     * denied. The exact effect disposer is returned for ordered ownership and\n     * HMR cleanup.\n     * @param guard - synchronous check; a returned string denies the execution.\n     * @returns the exact disposer that unregisters the guard.\n     */\n    guard(guard: ToolGuard): () => void\n    /**\n     * Look up a tool as one scope sees it (scoped\n     * shadows global; a restricted-away global reads as absent). Presenters pass\n     * the calling agent so the rendered card matches the definition that\n     * actually executed.\n     * @param name - the tool name as registered.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns the definition the scope resolves, or undefined when none is visible.\n     */\n    get(name: string, scope?: ScopeKey): ToolDefinition | undefined\n    /**\n     * Project visible definitions onto the allowlisted model-facing schema fields,\n     * excluding execution and presentation callbacks.\n     * @param scope - the viewing scope (the agent); omitted = the global view.\n     * @returns one deep-cloned schema per visible tool.\n     */\n    schemas(scope?: ScopeKey): ToolSchema[]\n    /**\n     * Classify a pending call through the caller's visible tool definition. Only\n     * an exact `true` is parallel; unknown, hidden, undeclared, invalid, or\n     * throwing classifiers are exclusive.\n     * @param exec - call name, parsed arguments, and optional agent scope.\n     * @returns the fail-closed scheduling mode.\n     */\n    executionMode(exec: ToolExecutionInput): ToolExecutionMode\n    /**\n     * Execute through pre-policy, guards, around-dispatch, post-policy,\n     * definition-owned content finalization, and final notification. Tool and\n     * listener failures resolve as materialized error results; an invisible tool\n     * reports `UNKNOWN_TOOL`. The returned outcome is the same lossless, frozen\n     * snapshot final observers receive. Cancellation\n     * arriving after entry and before final result materialization skips a\n     * not-yet-started body with `ABORTED_BEFORE_DISPATCH` or replaces a\n     * successful started outcome with `ABORTED`; already-started work is still\n     * drained and may retain a tool-owned structured error.\n     * @param exec - the typed same-process call input. The registry assigns its\n     *   correlation token before policy begins.\n     * @returns the materialized final result.\n     */\n    async execute(exec: ToolExecutionInput): Promise<ToolExecutionResult>\ntype shapes (referenced by the signatures above — read these before assuming a field is a string):\n    export type AdditionalContext = UserMessageData;\n    export abstract class Agent {\n        abstract readonly id: SessionId;\n        abstract readonly options: AgentOptions;\n        abstract readonly session: Session;\n        abstract readonly status: AgentStatus;\n        abstract readonly ctx: Context;\n        abstract send(content: ContentBlock[], options: SendOptions): AgentMessageId;\n        abstract cancel(cause: AgentCancelCause, options?: CancelOptions): void;\n        abstract whenIdle(): Promise<void>;\n        followup(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        steer(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        inject(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n        abstract retry(): void;\n    }\n    export type AgentCancelCause = {\n        readonly kind: 'user';\n    } | {\n        readonly kind: 'parent';\n    };\n    export type AgentMessageId = Branded<'AgentMessageId'>;\n    export interface AgentOptions {\n        provider?: string;\n        model?: string;\n    }\n    export type AgentStatus = 'idle' | 'running';\n    export interface AliasSendOptions {\n        source?: MessageSource;\n    }\n    export interface AssistantProvenance {\n        provider: string;\n        model: string;\n        replayState?: unknown;\n    }\n    export type Branded<B extends string> = string & {\n        readonly [BRAND]: B;\n    };\n    export type CallId = Branded<'CallId'>;\n    export interface CancelOptions {\n        keepInbox?: boolean;\n    }\n    export interface ContentBlockMap {\n        'text': TextBlock;\n        'reasoning': ReasoningBlock;\n        'tool-call': ToolCallBlock;\n        'tool-result': ToolResultBlock;\n    }\n    export type ContentBlockType = keyof ContentBlockMap;\n    export interface DiffCallView {\n        card: 'diff';\n        title: string;\n        diffs: FileDiff[];\n        locations?: FileLocation[];\n    }\n    export interface DiffResultView {\n        card: 'diff';\n        title?: string;\n        diffs: FileDiff[];\n    }\n    export interface EpochHeader {\n        config: LlmCallConfig;\n        system?: string;\n        tools?: ToolSchema[];\n        messagePrefix?: Message[];\n    }\n    export interface FileDiff {\n        path: string;\n        oldText: string | null;\n        newText: string;\n    }\n    export interface FileLocation {\n        path: string;\n        line?: number;\n    }\n    export type FinishReason = FinishReasonMap[keyof FinishReasonMap];\n    export interface FinishReasonMap {\n        'stop': {\n            kind: 'stop';\n        };\n        'tool-calls': {\n            kind: 'tool-calls';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        'aborted': {\n            kind: 'aborted';\n            failure: LlmFailure;\n        };\n        'error': {\n            kind: 'error';\n            failure: LlmFailure;\n        };\n    }\n    export interface GenericCallView {\n        card: 'generic';\n        title: string;\n        kind?: ToolCallKind;\n        rawInput?: unknown;\n        content?: ContentBlock[];\n        locations?: FileLocation[];\n    }\n    export interface GenericResultView {\n        card: 'generic';\n        title?: string;\n        content?: ContentBlock[];\n    }\n    export interface JsonSchemaNode {\n        type?: JsonSchemaType;\n        oneOf?: JsonSchemaNode[];\n        properties?: Record<string, JsonSchemaNode>;\n        required?: string[];\n        additionalProperties?: boolean;\n        items?: JsonSchemaNode;\n        enum?: JsonSchemaScalar[];\n        const?: JsonSchemaScalar;\n        description?: string;\n        title?: string;\n        default?: JsonValue;\n        examples?: JsonValue;\n    }\n    export type JsonSchemaScalar = string | number | boolean | null;\n    export type JsonSchemaType = 'object' | 'array' | 'string' | 'number' | 'integer' | 'boolean' | 'null';\n    export type JsonValue = null | boolean | number | string | JsonValue[] | {\n        [key: string]: JsonValue;\n    };\n    export interface LlmCallConfig {\n        provider: string;\n        model: string;\n        temperature?: number;\n        maxTokens?: number;\n        stop?: string[];\n    }\n    export interface LlmFailure {\n        readonly message: string;\n        readonly code: string;\n        readonly status?: number;\n        readonly providerRetryAfterMs?: number;\n        readonly requestId?: ProviderRequestId;\n    }\n    export interface Message {\n        role: 'system' | 'user' | 'assistant';\n        content: ContentBlock[];\n        provenance?: AssistantProvenance;\n    }\n    export type MessageSource = MessageSourceMap[keyof MessageSourceMap];\n    export interface MessageSourceMap {\n        user: {\n            kind: 'user';\n        };\n        plugin: {\n            kind: 'plugin';\n            plugin: string;\n        };\n    }\n    export type ProviderRequestId = Branded<'ProviderRequestId'>;\n    export interface ReasoningBlock {\n        type: 'reasoning';\n        text: string;\n    }\n    export type RequestHeaderReason = 'initial' | 'resume' | 'change';\n    export type ScopeKey = object;\n    export interface SendOptions {\n        target: SendTarget;\n        wakeup: boolean;\n        source: MessageSource;\n    }\n    export type SendTarget = 'next-turn' | 'next-step';\n    export class Session {\n        get surface(): SessionSurface;\n        readonly header: SessionHeader;\n        get id(): SessionId;\n        constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);\n        get events(): readonly SessionEvent[];\n        get seq(): number;\n        append<T extends SessionEventType>(type: T, data: SessionEventMap[T], ...opts: T extends SurfaceEventType ? [\n            opts: SurfaceIntent\n        ] : [\n        ]): SessionEvent<T>;\n        requestHeader(): EpochHeader | undefined;\n        deriveMessages(): Message[];\n        deriveEventMessage(event: SessionEvent): Message | null;\n    }\n    export type SessionEvent<T extends SessionEventType = SessionEventType> = {\n        [K in SessionEventType]: {\n            type: K;\n            seq: number;\n            time: number;\n            data: SessionEventMap[K];\n        } & (K extends SurfaceEventType ? {\n            sourceEventSeqs?: number[];\n            surfaceOp?: SurfaceOp;\n        } : object);\n    }[T];\n    export interface SessionEventMap {\n        'turn/start': {\n            turn: number;\n            trigger: TurnTrigger;\n        };\n        'turn/end': {\n            turn: number;\n            reason: TurnEndReason;\n        };\n        'step/start': {\n            turn: number;\n            step: number;\n        };\n        'step/end': {\n            turn: number;\n            step: number;\n        };\n        'user/message': UserMessageData;\n        'prompt/blocked': {\n            content: ContentBlock[];\n            source: MessageSource;\n            reason: string;\n        };\n        'assistant/chunk': {\n            turn: number;\n            step: number;\n            chunk: StreamChunk;\n        };\n        'assistant/message': {\n            turn: number;\n            step: number;\n            content: ContentBlock[];\n            provenance: AssistantProvenance;\n            usage?: TokenUsage;\n        };\n        'tool/call': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            name: string;\n            arguments: string;\n        };\n        'tool/result': {\n            turn: number;\n            step: number;\n            callId: CallId;\n            content: ContentBlock[];\n            isError: boolean;\n            error?: {\n                name: string;\n                code: string;\n            };\n            meta?: JsonValue;\n        };\n        'steering/message': UserMessageData & {\n            turn: number;\n        };\n        'todo/write': {\n            todos: TodoItem[];\n        };\n        'request/header': {\n            header: EpochHeader;\n            reason: RequestHeaderReason;\n        };\n    }\n    export type SessionEventType = keyof SessionEventMap;\n    export interface SessionHeader {\n        readonly version: number;\n        readonly id: SessionId;\n        readonly createdAt: number;\n        readonly cwd?: string;\n        readonly parentSession?: SessionId;\n        readonly seedLength?: number;\n        readonly delegationDepth?: number;\n    }\n    export type SessionId = Branded<'SessionId'>;\n    export interface SessionSurface {\n        readonly nodes: readonly number[];\n        readonly replaceGeneration: number;\n    }\n    export type StreamChunk = {\n        type: 'block-start';\n        index: number;\n        blockType: ContentBlockType;\n    } | {\n        type: 'text-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'reasoning-delta';\n        index: number;\n        text: string;\n    } | {\n        type: 'tool-call-delta';\n        index: number;\n        id: CallId;\n        name?: string;\n        argumentsDelta: string;\n    } | {\n        type: 'block-end';\n        index: number;\n        block: ContentBlock;\n    } | {\n        type: 'usage';\n        usage: TokenUsage;\n    } | {\n        type: 'finish';\n        reason: FinishReason;\n        replayState?: unknown;\n    };\n    export type SurfaceEventType = 'user/message' | 'assistant/message' | 'tool/result' | 'steering/message';\n    export interface SurfaceIntent {\n        surfaceOp: SurfaceOp;\n        sourceEventSeqs?: number[];\n    }\n    export type SurfaceOp = 'append' | {\n        op: 'replace';\n        start: number;\n        end: number;\n    };\n    export interface TerminalCallView {\n        card: 'terminal';\n        title: string;\n        description?: string;\n        cwd?: string;\n    }\n    export interface TerminalResultView {\n        card: 'terminal';\n        title?: string;\n        output?: string;\n        exitCode?: number;\n        signal?: string;\n    }\n    export interface TodoItem {\n        content: string;\n        status: 'pending' | 'in_progress' | 'completed';\n    }\n    export interface TokenUsage {\n        inputTokens: number;\n        outputTokens: number;\n        cacheReadTokens?: number;\n        cacheWriteTokens?: number;\n        reasoningTokens?: number;\n    }\n    export interface ToolCallBlock {\n        type: 'tool-call';\n        id: CallId;\n        name: string;\n        arguments: string;\n    }\n    export type ToolCallKind = 'read' | 'edit' | 'delete' | 'move' | 'search' | 'execute' | 'fetch' | 'other';\n    export type ToolCallView = GenericCallView | TerminalCallView | DiffCallView;\n    export interface ToolDefinition extends ToolSchema {\n        readonly output: ToolOutputDefinition;\n        execute(args: unknown, exec: ToolRunContext): Promise<unknown>;\n        finalizeContent?(exec: Readonly<ToolExecution>, result: Readonly<ToolExecutionResult>): ContentBlock[] | undefined;\n        timeoutMs?: number;\n        isConcurrencySafe?(args: unknown): boolean;\n        presentCall?(args: unknown): ToolCallView | undefined;\n        presentResult?(args: unknown, result: ToolResult): ToolResultView | undefined;\n    }\n    export interface ToolErrorInfo {\n        name: string;\n        code: string;\n    }\n    export interface ToolExecution extends ToolExecutionInput {\n        readonly token: ToolExecutionToken;\n    }\n    export interface ToolExecutionFailure {\n        readonly isError: true;\n        readonly error: ToolFailure;\n        readonly value?: never;\n        readonly content: ContentBlock[];\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: never;\n    }\n    export interface ToolExecutionInput {\n        readonly callId: CallId;\n        readonly name: string;\n        readonly arguments: unknown;\n        readonly agent?: Agent;\n        readonly parent?: ToolExecutionToken;\n        readonly signal: AbortSignal;\n    }\n    export type ToolExecutionMode = {\n        kind: 'parallel';\n    } | {\n        kind: 'exclusive';\n    };\n    export type ToolExecutionResult = ToolExecutionSuccess | ToolExecutionFailure;\n    export interface ToolExecutionSuccess {\n        readonly isError: false;\n        readonly value: JsonValue;\n        readonly content: ContentBlock[];\n        readonly error?: never;\n        readonly meta?: JsonValue;\n        readonly additionalContexts?: AdditionalContext[];\n        readonly concludesTurn?: true;\n    }\n    export type ToolExecutionToken = symbol & {\n        readonly [toolExecutionTokenBrand]: true;\n    };\n    export interface ToolFailure {\n        message: string;\n        info?: ToolErrorInfo;\n    }\n    export type ToolGuard = (execution: Readonly<ToolExecution>) => string | undefined;\n    export interface ToolOutputDefinition {\n        readonly schema: JsonSchemaNode;\n        render(args: unknown, value: JsonValue): ContentBlock[];\n        presentationMeta?(args: unknown, value: JsonValue): JsonValue;\n    }\n    export interface ToolRestriction {\n        readonly allow?: readonly string[];\n        readonly deny?: readonly string[];\n    }\n    export interface ToolResult {\n        content: ContentBlock[];\n        isError: boolean;\n        meta?: JsonValue;\n    }\n    export interface ToolResultBlock {\n        type: 'tool-result';\n        toolCallId: CallId;\n        content: ContentBlock[];\n        isError?: boolean;\n    }\n    export type ToolResultView = GenericResultView | TerminalResultView | DiffResultView;\n    export interface ToolRunContext extends ToolExecution {\n        deferContext(context: AdditionalContext): void;\n        concludeTurn(): void;\n    }\n    export interface ToolSchema {\n        name: string;\n        description: string;\n        parameters: Record<string, unknown>;\n    }\n    export type TurnEndReason = TurnEndReasonMap[keyof TurnEndReasonMap];\n    export interface TurnEndReasonMap {\n        completed: {\n            kind: 'completed';\n        };\n        aborted: {\n            kind: 'aborted';\n        };\n        error: {\n            kind: 'error';\n            step: number;\n        } & ({\n            failure: LlmFailure;\n            message?: never;\n            code?: never;\n        } | {\n            message: string;\n            code?: string;\n            failure?: never;\n        });\n        disposed: {\n            kind: 'disposed';\n        };\n        'max-tokens': {\n            kind: 'max-tokens';\n        };\n        rejected: {\n            kind: 'rejected';\n            reason: string;\n        };\n        interrupted: {\n            kind: 'interrupted';\n        };\n    }\n    export type TurnTrigger = TurnTriggerMap[keyof TurnTriggerMap];\n    export interface TurnTriggerMap {\n        message: {\n            kind: 'message';\n            source: MessageSource;\n        };\n        retry: {\n            kind: 'retry';\n        };\n        injection: {\n            kind: 'injection';\n            source: MessageSource;\n        };\n    }\n    export interface UserMessageData {\n        content: ContentBlock[];\n        source: MessageSource;\n    }"}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"inspect-tools-event","title":"Inspect cordis runtime: events: tools/pre-execute","kind":"read","status":"in_progress"}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"inspect-tools-event","status":"completed","content":[{"type":"content","content":{"type":"text","text":"## events\n- tools/pre-execute [waterfall] — Allow, deny, or ask before dispatch.\n    /**\n     * Allow, deny, or ask before dispatch. `next()` delegates to allow; missing\n     * approval support turns `ask` into denial. Async gates must observe\n     * `exec.signal`; the registry rechecks cancellation after they settle but\n     * never abandons their promise.\n     * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent's calls.\n     * @param exec - the pending call (name, parsed arguments, caller agent).\n     * @mode waterfall\n     */\n    'tools/pre-execute'(this: Scoped<ToolRegistry>, exec: ToolExecution, next: () => Promise<PreToolDecision>): Promise<PreToolDecision>\nwaterfall listeners receive a trailing next() and MUST call it to delegate — returning without next() vetoes the chain."}}]}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"CORDIS_INSPECT_JSDOC_OK"}}}}
diff --git a/packages/cordis/tool-cordis/src/api-catalog.ts b/packages/cordis/tool-cordis/src/api-catalog.ts
index afd6f06539..2b49d3512d 100644
--- a/packages/cordis/tool-cordis/src/api-catalog.ts
+++ b/packages/cordis/tool-cordis/src/api-catalog.ts
@@ -1157,7 +1157,7 @@ export const TYPE_API: readonly TypeApiEntry[] = [
   },
   {
     name: 'Agent',
-    declaration: 'export abstract class Agent {\n    abstract readonly id: SessionId;\n    abstract readonly options: AgentOptions;\n    abstract readonly session: Session;\n    abstract readonly status: AgentStatus;\n    abstract readonly ctx: Context;\n    abstract send(content: ContentBlock[], options?: SendOptions): AgentMessageId;\n    abstract cancel(cause: AgentCancelCause, options?: CancelOptions): void;\n    abstract whenIdle(): Promise<void>;\n    followup(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n    steer(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n    inject(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n    abstract retry(): void;\n}',
+    declaration: 'export abstract class Agent {\n    abstract readonly id: SessionId;\n    abstract readonly options: AgentOptions;\n    abstract readonly session: Session;\n    abstract readonly status: AgentStatus;\n    abstract readonly ctx: Context;\n    abstract send(content: ContentBlock[], options: SendOptions): AgentMessageId;\n    abstract cancel(cause: AgentCancelCause, options?: CancelOptions): void;\n    abstract whenIdle(): Promise<void>;\n    followup(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n    steer(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n    inject(content: ContentBlock[], options?: AliasSendOptions): AgentMessageId;\n    abstract retry(): void;\n}',
   },
   {
     name: 'AgentCancelCause',
diff --git a/packages/core/agent-loop/src/agent.ts b/packages/core/agent-loop/src/agent.ts
index ec0e1c9910..b30c858373 100644
--- a/packages/core/agent-loop/src/agent.ts
+++ b/packages/core/agent-loop/src/agent.ts
@@ -90,10 +90,10 @@ export class ReactLoopAgent extends Agent {
   /** Accept and route one unified send item. */
   send(
     content: ContentBlock[],
-    options: SendOptions = { target: 'next-turn', wakeup: true, source: { kind: 'user' } },
+    options: SendOptions,
   ): AgentMessageId {
-    const id = AgentMessageId(randomUUID())
     const { target, wakeup, source } = options
+    const id = AgentMessageId(randomUUID())
     if (target === 'next-step' && !wakeup) {
       if (this.turnOpen) {
         this.outbox.push({ content, source })
diff --git a/packages/core/agent-loop/tests/agent.spec.ts b/packages/core/agent-loop/tests/agent.spec.ts
index 69b21966f5..e75bdf6618 100644
--- a/packages/core/agent-loop/tests/agent.spec.ts
+++ b/packages/core/agent-loop/tests/agent.spec.ts
@@ -48,7 +48,7 @@ function waitForStatus(ctx: Context, agent: Agent, expected: Agent['status']): P
 }
 
 function send(agent: Agent, text: string) {
-  agent.send([{ type: 'text', text }])
+  agent.followup([{ type: 'text', text }])
 }
 
 describe('Agent', () => {
@@ -275,7 +275,7 @@ describe('Agent', () => {
     prepared.markPublished()
     prepared.start()
     const dispose = prepared.dispose
-    agent.send([{ type: 'text', text: 'go' }])
+    agent.followup([{ type: 'text', text: 'go' }])
     await new Promise(r => setTimeout(r, 30))
     expect(agent.status).toBe('running')
 
diff --git a/packages/core/agent-loop/tests/cancel.spec.ts b/packages/core/agent-loop/tests/cancel.spec.ts
index c60c5e407b..72c9c21aec 100644
--- a/packages/core/agent-loop/tests/cancel.spec.ts
+++ b/packages/core/agent-loop/tests/cancel.spec.ts
@@ -33,7 +33,7 @@ async function harness(adapter: MockAdapter) {
 }
 
 function send(agent: Agent, text: string) {
-  agent.send([{ type: 'text', text }])
+  agent.followup([{ type: 'text', text }])
 }
 
 /** Resolve on the agent's next idle transition (event-based, not status poll). */
@@ -63,7 +63,7 @@ describe('Agent.cancel()', () => {
     ctx.on('agent/cancel-requested', (subject, cause) => {
       if (subject !== agent) return
       seen.push(`first:${cause.kind}`)
-      subject.send([{ type: 'text', text: 'queued by cancel observer' }])
+      subject.followup([{ type: 'text', text: 'queued by cancel observer' }])
       throw new Error('observer failed')
     })
     ctx.on('agent/cancel-requested', (subject, cause) => {
diff --git a/packages/core/agent-loop/tests/contract-regressions.spec.ts b/packages/core/agent-loop/tests/contract-regressions.spec.ts
index 6e0b7df5dd..79ea648428 100644
--- a/packages/core/agent-loop/tests/contract-regressions.spec.ts
+++ b/packages/core/agent-loop/tests/contract-regressions.spec.ts
@@ -50,7 +50,7 @@ function waitForIdle(ctx: Context, agent: Agent): Promise<void> {
 }
 
 function send(agent: Agent, text: string) {
-  agent.send([{ type: 'text', text }])
+  agent.followup([{ type: 'text', text }])
 }
 
 describe('session log records what agent/step-result actually produced', () => {
@@ -851,7 +851,7 @@ describe('adapter registration, routing, and accepted-input ownership', () => {
       notifiedSource = info.source
     })
 
-    agent.send([{ type: 'text', text: 'start' }])
+    agent.followup([{ type: 'text', text: 'start' }])
     await entered.promise
     expect(agent.status).toBe('running')
     const content = [{ type: 'text' as const, text: 'accepted-steer' }]
@@ -909,7 +909,7 @@ describe('turn numbering continues across seeded sessions', () => {
 
     const turns: number[] = []
     ctx2.on('session/event', (_s, event) => { if (event.type === 'turn/start') turns.push(event.data.turn) })
-    forked.send([{ type: 'text', text: 'continue' }])
+    forked.followup([{ type: 'text', text: 'continue' }])
     await new Promise<void>((resolve) => {
       ctx2.on('agent/status', (subject, status) => {
         if (subject === forked && status === 'idle') resolve()
diff --git a/packages/core/agent-loop/tests/coverage-edges.spec.ts b/packages/core/agent-loop/tests/coverage-edges.spec.ts
index a3bbef4092..0f26d6106d 100644
--- a/packages/core/agent-loop/tests/coverage-edges.spec.ts
+++ b/packages/core/agent-loop/tests/coverage-edges.spec.ts
@@ -38,7 +38,7 @@ function waitForIdle(ctx: Context, agent: Agent): Promise<void> {
 }
 
 function send(agent: Agent, text: string) {
-  agent.send([{ type: 'text', text }])
+  agent.followup([{ type: 'text', text }])
 }
 
 describe('inbox acceptance', () => {
@@ -50,7 +50,7 @@ describe('inbox acceptance', () => {
     ctx.on('agent/inbox/enqueue', () => { queued += 1 })
 
     expect(() => {
-      agent.send([{ type: 'text', text: 'first', bad: 1n } as never])
+      agent.followup([{ type: 'text', text: 'first', bad: 1n } as never])
     }).toThrow(/losslessly JSON-serializable/)
     expect(() => {
       agent.send([{ type: 'text', text: 'first' }], {
diff --git a/packages/core/agent-loop/tests/interception.spec.ts b/packages/core/agent-loop/tests/interception.spec.ts
index 1b1f981c81..86786f647c 100644
--- a/packages/core/agent-loop/tests/interception.spec.ts
+++ b/packages/core/agent-loop/tests/interception.spec.ts
@@ -42,7 +42,7 @@ function waitForIdle(ctx: Context, agent: Agent): Promise<void> {
 }
 
 function send(agent: Agent, text: string) {
-  agent.send([{ type: 'text', text }])
+  agent.followup([{ type: 'text', text }])
 }
 
 function events(agent: Agent): SessionEvent[] {
@@ -151,7 +151,7 @@ describe('agent/prompt-submit', () => {
     const reasons: TurnEndReason[] = []
     ctx.on('session/event', (_s, event: SessionEvent) => { if (event.type === 'turn/end') reasons.push(event.data.reason) })
 
-    agent.send([{ type: 'text', text: 'do something' }])
+    agent.followup([{ type: 'text', text: 'do something' }])
     await waitForIdle(ctx, agent)
 
     // the model was never called
diff --git a/packages/core/agent-loop/tests/loop.spec.ts b/packages/core/agent-loop/tests/loop.spec.ts
index d833fbb490..5636854f77 100644
--- a/packages/core/agent-loop/tests/loop.spec.ts
+++ b/packages/core/agent-loop/tests/loop.spec.ts
@@ -42,7 +42,7 @@ function waitForIdle(ctx: Context, agent: Agent): Promise<void> {
 }
 
 function send(agent: Agent, text: string) {
-  agent.send([{ type: 'text', text }])
+  agent.followup([{ type: 'text', text }])
 }
 
 describe('agent loop', () => {
@@ -1068,9 +1068,9 @@ describe('agent loop', () => {
     const agent = ctx.agentLoop.create(SessionId('a1'), { provider: 'mock', model: 'mock' })
 
     const idle = waitForIdle(ctx, agent)
-    agent.send([{ type: 'text', text: 'user message' }])
+    agent.followup([{ type: 'text', text: 'user message' }])
     await Promise.resolve()
-    agent.send(
+    agent.followup(
       [{ type: 'text', text: 'plugin message' }],
       { source: { kind: 'plugin', plugin: 'test' } },
     )
diff --git a/packages/core/agent/README.md b/packages/core/agent/README.md
index 5e6e37d466..9c4e79012a 100644
--- a/packages/core/agent/README.md
+++ b/packages/core/agent/README.md
@@ -56,7 +56,7 @@ Turn and step boundaries and the model token stream are durable `session/event`
 
 The handle every plugin programs against:
 
-- `agent.send(content, options?)` — the one delivery primitive over the (`target` × `wakeup`) matrix; `Agent` is an abstract class whose `followup`/`steer`/`inject` aliases are fixed-preset delegates to it. It returns the accepted message's opaque `AgentMessageId`, which the message's `agent/inbox/enqueue`/`dequeue`/`discard` events carry so a caller can correlate a queued item with its lifecycle. Omitting the whole options object selects `{ target: 'next-turn', wakeup: true, source: { kind: 'user' } }`; a supplied `SendOptions` must provide all three fields. `target: 'next-turn'` queues one independent FIFO item that, if admitted, becomes the sole ordinary prompt in its turn. `target: 'next-step'` with `wakeup: true` submits steering, while `target: 'next-step'` with `wakeup: false` injects durable context without running the model. The [one-send-one-turn Agent Note](../../../.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.md) owns the turn rationale.
+- `agent.send(content, options)` — the one delivery primitive over the (`target` × `wakeup`) matrix; `Agent` is an abstract class whose `followup`/`steer`/`inject` aliases are fixed-preset delegates to it. It returns the accepted message's opaque `AgentMessageId`, which the message's `agent/inbox/enqueue`/`dequeue`/`discard` events carry so a caller can correlate a queued item with its lifecycle. `SendOptions` requires `target`, `wakeup`, and `source`; callers wanting the ordinary user-message preset use `followup(content)`. `target: 'next-turn'` queues one independent FIFO item that, if admitted, becomes the sole ordinary prompt in its turn. `target: 'next-step'` with `wakeup: true` submits steering, while `target: 'next-step'` with `wakeup: false` injects durable context without running the model. The [one-send-one-turn Agent Note](../../../.agents/notes/implemented/simplification/2026-07-17-one-send-one-turn.md) owns the turn rationale.
 - `agent.followup(content, options?)` — the `next-turn`/wakeup preset of `send()`: queue an ordinary follow-up turn and wake the driver.
 - `agent.steer(content, options?)` — the `next-step`/wakeup preset: while a turn is open, stage steering for its next safe boundary without dispatching `agent/prompt-submit`; when idle, delegate to a woken follow-up. Cancellation or disposal may discard pending steering.
 - `agent.inject(content, options?)` — the `next-step`/no-wakeup preset: append model-facing context without running the model; the next request sees a verbatim user-role message whose provenance is carried by `source`. While a turn is open, injection waits in the outbox for the next safe boundary. While idle, it appends immediately without opening a turn; persistence reacts to `session/event` independently. Injection emits no `agent/inbox/*` event.
diff --git a/packages/core/agent/src/types.ts b/packages/core/agent/src/types.ts
index f3e4106339..aa97e1ecf7 100644
--- a/packages/core/agent/src/types.ts
+++ b/packages/core/agent/src/types.ts
@@ -40,8 +40,8 @@ export type SendTarget = 'next-turn' | 'next-step'
  * (`next-turn`/wakeup), {@link Agent.steer} (`next-step`/wakeup), and
  * {@link Agent.inject} (`next-step`/no-wakeup).
  *
- * Omitting the whole options object selects the ordinary user-message preset.
- * A supplied object is complete so its routing and provenance are explicit.
+ * The object is complete so routing and provenance are explicit; callers that
+ * want the ordinary user-message preset use {@link Agent.followup}.
  */
 export interface SendOptions {
   /** Queue the item joins. */
@@ -160,8 +160,8 @@ export abstract class Agent {
    * The unified delivery primitive over the (`target` × `wakeup`) matrix.
    * It routes the caller's typed content and source as follows:
    *
-   * - `next-turn` (default) queues an item that becomes the sole ordinary
-   *   message of its own FIFO-ordered turn; `wakeup` (default `true`) wakes a
+   * - `next-turn` queues an item that becomes the sole ordinary message of its
+   *   own FIFO-ordered turn; `wakeup:true` wakes a
    *   parked driver, while `wakeup:false` queues without waking.
    * - `next-step` with `wakeup:true` submits steering into the active turn
    *   (idle falls back to a woken `next-turn`).
@@ -173,7 +173,7 @@ export abstract class Agent {
    * @param options - target queue, wakeup decision, and source.
    * @returns the accepted message's {@link AgentMessageId}, stable across its `agent/inbox/*` events.
    */
-  abstract send(content: ContentBlock[], options?: SendOptions): AgentMessageId
+  abstract send(content: ContentBlock[], options: SendOptions): AgentMessageId
 
   /**
    * Clear queued and steering work — unless `keepInbox` — and abort the active