feat(agent): rename InboxItemInfo to AgentMessage with an id; send returns it

Add a branded AgentMessageId assigned to each accepted send message and
returned from send/followup/steer/inject (was void). Rename the inbox
event payload InboxItemInfo to AgentMessage, carrying that id so a caller
can correlate a queued item with its enqueue/dequeue/discard events.

packages/core/agent-loop/src/agent.ts

@@ -6,15 +6,16 @@
  * @module dsh-agent-loop/agent
  */
 
+import { randomUUID } from 'node:crypto'
 import type { Context } from 'cordis'
-import { agentEvents } from '@deepseek-ai/dsh-agent'
+import { agentEvents, AgentMessageId } from '@deepseek-ai/dsh-agent'
 import { Agent } from '@deepseek-ai/dsh-agent'
 import type { AgentCancelCause, AgentOptions, AgentStatus, CancelOptions, HookContext, SendOptions } from '@deepseek-ai/dsh-agent'
 import { deepFreeze, errorChain } from '@deepseek-ai/dsh-llm'
 import type { ContentBlock, MessageSource } from '@deepseek-ai/dsh-llm'
 import { snapshotJsonValue, type Session, type SessionId } from '@deepseek-ai/dsh-session'
 import { DISPOSED_INTERRUPT_REASON, TurnCancellation } from './cancellation.ts'
-import { Inbox, inboxInfo, type InboxMessage } from './inbox.ts'
+import { Inbox, agentMessage, type InboxMessage } from './inbox.ts'
 import { isTurnOpen, lastTurnNumber, runLoop } from './loop.ts'
 
 /** Sessions already claimed by a concrete driver construction. */
@@ -196,9 +197,11 @@ export class ReactLoopAgent extends Agent {
    * materialization reads every nested field once; deep freeze prevents later
    * caller mutation before an inbox or deferred-injection queue drains it.
    */
-  private acceptMessage(content: ContentBlock[], source: MessageSource, wakeup: boolean, options?: SendOptions): InboxMessage {
+  private acceptMessage(
+    id: AgentMessageId, content: ContentBlock[], source: MessageSource, wakeup: boolean, options?: SendOptions,
+  ): InboxMessage {
     const contexts = options?.contexts ?? []
-    const accepted = snapshotJsonValue({ content, source, contexts, wakeup })
+    const accepted = snapshotJsonValue({ id, content, source, contexts, wakeup })
     if (accepted === undefined) {
       throw new TypeError('agent message content, source, and contexts must be losslessly JSON-serializable')
     }
@@ -219,23 +222,25 @@ export class ReactLoopAgent extends Agent {
     if (this._status === 'disposed') throw new Error(`agent "${this.id}" is disposed`)
   }
 
-  send(content: ContentBlock[], options?: SendOptions): void {
+  send(content: ContentBlock[], options?: SendOptions): AgentMessageId {
     this.assertNotDisposed()
+    const id = AgentMessageId(randomUUID())
     const target = options?.target ?? 'next-turn'
     const wakeup = options?.wakeup ?? true
     // next-step/no-wakeup is injection: durable context without running the model.
-    if (target === 'next-step' && !wakeup) { this.injectContext(content, options); return }
+    if (target === 'next-step' && !wakeup) { this.injectContext(content, options); return id }
     // next-step/wakeup is steering into the running turn; idle falls back to a
     // woken follow-up turn (there is no active turn to attach to).
     const steering = target === 'next-step' && this._status === 'running'
     const source = options?.source ?? { kind: 'user' }
-    const accepted = this.acceptMessage(content, source, wakeup, options)
+    const accepted = this.acceptMessage(id, content, source, wakeup, options)
     if (steering) {
       this.#inbox.steer(accepted)
     } else {
       this.#inbox.enqueue(accepted, wakeup)
     }
-    agentEvents(this.loopCtx, this).emit('agent/inbox/enqueue', inboxInfo(accepted, steering))
+    agentEvents(this.loopCtx, this).emit('agent/inbox/enqueue', agentMessage(accepted, steering))
+    return id
   }
 
   /** The `next-step`/no-wakeup injection path: durable context, no FIFO, no run. */
@@ -346,7 +351,7 @@ export class ReactLoopAgent extends Agent {
       // Clear work already present before abort observers run.
       this.#inbox.clear()
       if (discarded.length > 0) {
-        const items = discarded.map(({ message, steering }) => inboxInfo(message, steering))
+        const items = discarded.map(({ message, steering }) => agentMessage(message, steering))
         agentEvents(this.loopCtx, this).emit('agent/inbox/discard', items)
       }
     }

packages/core/agent-loop/src/inbox.ts

@@ -7,10 +7,11 @@
  */
 
 import type { ContentBlock, MessageSource } from '@deepseek-ai/dsh-llm'
-import type { HookContext, InboxItemInfo } from '@deepseek-ai/dsh-agent'
+import type { AgentMessage, AgentMessageId, HookContext } from '@deepseek-ai/dsh-agent'
 
-/** One message waiting in an agent's inbox. */
+/** One message waiting in an agent's inbox; `id` is the value `send` returned. */
 export interface InboxMessage {
+  id: AgentMessageId
   content: ContentBlock[]
   source: MessageSource
   contexts: HookContext[]
@@ -22,10 +23,10 @@ export interface InboxMessage {
  * Build the `agent/inbox/*` event payload for one inbox item.
  * @param message - the accepted inbox record.
  * @param steering - whether the item is in the steering FIFO (`next-step`).
- * @returns the live-event facts for enqueue/dequeue/discard.
+ * @returns the live-event message for enqueue/dequeue/discard.
  */
-export function inboxInfo(message: InboxMessage, steering: boolean): InboxItemInfo {
-  return { content: message.content, source: message.source, contexts: message.contexts, steering, wakeup: message.wakeup }
+export function agentMessage(message: InboxMessage, steering: boolean): AgentMessage {
+  return { id: message.id, content: message.content, source: message.source, contexts: message.contexts, steering, wakeup: message.wakeup }
 }
 
 /**

packages/core/agent-loop/src/loop.ts

@@ -5,11 +5,12 @@
  * @module dsh-agent-loop/loop
  */
 
+import { randomUUID } from 'node:crypto'
 import type { Context } from 'cordis'
 import type { ContentBlock, FinishReason, GenerateOptions, LlmCallConfig, LlmFailure, Message } from '@deepseek-ai/dsh-llm'
 import { isDeepStrictEqual } from 'node:util'
 import { BlockAssembler, HarnessError, LlmError, assertNever, deepFreeze, errorChain, llmFailureOf, markAgentLoopRequest } from '@deepseek-ai/dsh-llm'
-import { agentEvents, agentInterruptReasonOf, assembleContextFor } from '@deepseek-ai/dsh-agent'
+import { agentEvents, agentInterruptReasonOf, assembleContextFor, AgentMessageId } from '@deepseek-ai/dsh-agent'
 import type { AgentEventDispatch, ContinuationDecision, HookContext, PromptDecision, RequestError, RequestErrorDecision } from '@deepseek-ai/dsh-agent'
 import { canonicalHeader } from '@deepseek-ai/dsh-session'
 import type { PromptMessageData, Session, TurnEndReason, TurnTrigger } from '@deepseek-ai/dsh-session'
@@ -19,7 +20,7 @@ import { renderPrompt } from '@deepseek-ai/dsh-system-prompt'
 import type { PromptAssembly } from '@deepseek-ai/dsh-system-prompt'
 import type {} from '@deepseek-ai/dsh-tools'
 import { executeToolCalls } from './tool-calls.ts'
-import { inboxInfo, type Inbox, type InboxMessage } from './inbox.ts'
+import { agentMessage, type Inbox, type InboxMessage } from './inbox.ts'
 import type { TurnCancellation } from './cancellation.ts'
 
 /** Normalize thrown values while preserving an existing error code. */
@@ -279,7 +280,7 @@ async function runTurn(
   const drainSteering = (): boolean => {
     const messages = handle.inbox.drainSteering()
     for (const message of messages) {
-      events.emit('agent/inbox/dequeue', inboxInfo(message, true))
+      events.emit('agent/inbox/dequeue', agentMessage(message, true))
       const prepared = preparePromptMessage(message.content, message.source, message.contexts)
       session.append('steering/message', { turn, ...prepared.data }, { surfaceOp: 'append' })
       for (const context of prepared.separateContexts) {
@@ -297,7 +298,7 @@ async function runTurn(
   const message = handle.inbox.dequeueQueued()
   /* v8 ignore next 3 -- invariant guard: runLoop only calls runTurn when hasQueued */
   if (!message) throw new Error('runTurn invariant violated: no queued message at turn start')
-  events.emit('agent/inbox/dequeue', inboxInfo(message, false))
+  events.emit('agent/inbox/dequeue', agentMessage(message, false))
   const trigger: TurnTrigger = { kind: 'message', source: message.source }
 
   let reason: TurnEndReason = { kind: 'completed' }
@@ -542,9 +543,12 @@ async function runTurn(
       // enqueue event a public steer would, so the inbox ledger stays balanced
       // (every FIFO entry has a matching enqueue before its dequeue/discard).
       if (decision.action === 'continue' && decision.reason) {
-        const item: InboxMessage = { content: decision.reason.content, source: decision.reason.source, contexts: [], wakeup: true }
+        const item: InboxMessage = {
+          id: AgentMessageId(randomUUID()), content: decision.reason.content,
+          source: decision.reason.source, contexts: [], wakeup: true,
+        }
         handle.inbox.steer(item)
-        events.emit('agent/inbox/enqueue', inboxInfo(item, true))
+        events.emit('agent/inbox/enqueue', agentMessage(item, true))
       }
       let shouldContinue = decision.action === 'continue'