fix(session-reference): bind snapshots to prompts

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

@@ -14,6 +14,7 @@ import type {
   SessionEvent,
   SessionEventMap,
 } from '@deepseek-ai/dsh-session'
+import { displayPromptContent } from '@deepseek-ai/dsh-session'
 import { fallbackSessionTitle, normalizeSessionTitle } from './normalize.ts'
 
 export { fallbackSessionTitle, normalizeSessionTitle, truncateTitleUtf8 } from './normalize.ts'
@@ -201,8 +202,9 @@ export function collectSessionTitleMessages(
   for (const event of events) {
     if (throughSeq !== undefined && event.seq > throughSeq) break
     if (event.type !== 'user/message' || event.data.source.kind !== 'user') continue
-    const text = event.data.content
-      .filter((block): block is Extract<(typeof event.data.content)[number], { type: 'text' }> => block.type === 'text')
+    const content = displayPromptContent(event.data)
+    const text = content
+      .filter((block): block is Extract<(typeof content)[number], { type: 'text' }> => block.type === 'text')
       .map(block => block.text)
       .join('\n')
     if (normalizeSessionTitle(text, Number.MAX_SAFE_INTEGER).length === 0) continue

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

@@ -72,6 +72,33 @@ describe('SessionTitleService', () => {
     expect(session.surface.nodes).toEqual([message.seq])
   })
 
+  it('derives a fallback title from the direct prompt instead of baked prefix context', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SessionStore)
+    await ctx.plugin(SessionTitleService, CONFIG)
+    const session = ctx.sessions.create(SessionId('prefixed-title'))
+    session.append('turn/start', {
+      turn: 1,
+      trigger: { kind: 'message', source: { kind: 'user' } },
+    })
+    session.append('user/message', {
+      content: [
+        { type: 'text', text: 'referenced snapshot title must stay hidden' },
+        { type: 'text', text: '\n\n## My request:\n' },
+        { type: 'text', text: 'Explain this referenced session' },
+      ],
+      source: { kind: 'user' },
+      envelope: {
+        displayContent: [{ type: 'text', text: 'Explain this referenced session' }],
+        prefixContexts: [{ source: { kind: 'plugin', plugin: 'session-reference' } }],
+      },
+    }, { surfaceOp: 'append' })
+
+    await settleTitles()
+
+    expect(ctx.sessionTitle.get(session)?.title).toBe('Explain this referenced session')
+  })
+
   it('waits through synthetic, empty, and non-text messages, then keeps the first fallback', async () => {
     const ctx = new Context()
     await ctx.plugin(SessionStore)