refactor: identify and freeze messages at creation

packages/session-title/session-title-llm/src/index.ts

@@ -6,7 +6,7 @@
 
 import type { Context } from 'cordis'
 import z from 'schemastery'
-import { BlockAssembler, deepFreeze } from '@deepseek-ai/dsh-llm'
+import { createUserMessage, BlockAssembler, deepFreeze } from '@deepseek-ai/dsh-llm'
 import type { FinishReason, GenerateOptions, Message } from '@deepseek-ai/dsh-llm'
 import { deadline, MAX_TIMER_DELAY_MS } from '@deepseek-ai/dsh-timeout'
 import {
@@ -248,10 +248,10 @@ export async function generateSessionTitleWithLlm(
     throw new Error(`session-title-llm: input is ${inputBytes} bytes, exceeding maxInputBytes ${config.maxInputBytes}`)
   }
   const route = resolveRoute(config, request)
-  const messages: Message[] = [{
-    role: 'user',
+  const messages: Message[] = [createUserMessage({
     content: [{ type: 'text', text: framedInput }],
-  }]
+    source: { kind: 'plugin', plugin: 'dsh-session-title-llm' },
+  })]
   const system = systemPrompt(config)
   using callDeadline = deadline(request.signal, config.timeoutMs, SESSION_TITLE_TIMEOUT_CODE)
   const options: GenerateOptions = deepFreeze({
@@ -281,7 +281,7 @@ export async function generateSessionTitleWithLlm(
   callDeadline.signal.throwIfAborted()
   const terminalError = finishError(assembler.finish)
   if (terminalError !== undefined) throw terminalError
-  const blocks = assembler.message().content
+  const blocks = assembler.blocks()
   if (blocks.some(block => block.type === 'tool-call')) {
     throw new Error('session-title-llm: title output must contain text only')
   }

packages/session-title/session-title-llm/tests/llm.spec.ts

@@ -1,6 +1,6 @@
 import { Context } from 'cordis'
 import { describe, expect, it, vi } from 'vitest'
-import LlmService, { CallId, isAgentLoopRequest, LlmAdapter } from '@deepseek-ai/dsh-llm'
+import LlmService, { createUserMessage, CallId, isAgentLoopRequest, LlmAdapter  } from '@deepseek-ai/dsh-llm'
 import type { FinishReason, GenerateOptions, StreamChunk } from '@deepseek-ai/dsh-llm'
 import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'
 import { SessionTitleProviderId } from '@deepseek-ai/dsh-session-title'
@@ -82,14 +82,14 @@ function request(ctx: Context, signal = new AbortController().signal): SessionTi
     turn: 1,
     trigger: { kind: 'message', source: { kind: 'user' } },
   })
-  const first = session.append('user/message', {
+  const first = session.append('user/message', createUserMessage({
     content: [{ type: 'text', text: 'first prompt' }],
     source: { kind: 'user' },
-  }, { surfaceOp: 'append' })
-  const second = session.append('user/message', {
+  }), { surfaceOp: 'append' })
+  const second = session.append('user/message', createUserMessage({
     content: [{ type: 'text', text: '第二个问题' }],
     source: { kind: 'user' },
-  }, { surfaceOp: 'append' })
+  }), { surfaceOp: 'append' })
   session.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
   return {
     session,