fix(acp): refresh session info after auto-title

acp_adapter/server.py

@@ -46,6 +46,7 @@ from acp.schema import (
     ResourceContentBlock,
     SessionCapabilities,
     SessionForkCapabilities,
+    SessionInfoUpdate,
     SessionListCapabilities,
     SessionMode,
     SessionModeState,
@@ -707,6 +708,35 @@ class HermesACPAgent(acp.Agent):
                 exc_info=True,
             )
 
+    async def _send_session_info_update(self, session_id: str) -> None:
+        """Send ACP native session metadata after Hermes changes it."""
+        if not self._conn:
+            return
+        try:
+            row = self.session_manager._get_db().get_session(session_id)
+        except Exception:
+            logger.debug("Could not read ACP session info for %s", session_id, exc_info=True)
+            return
+        if not row:
+            return
+
+        title = row.get("title")
+        updated_at = row.get("updated_at")
+        if updated_at is not None and not isinstance(updated_at, str):
+            updated_at = str(updated_at)
+        update = SessionInfoUpdate(
+            session_update="session_info_update",
+            title=title if isinstance(title, str) and title.strip() else None,
+            updated_at=updated_at,
+        )
+        try:
+            await self._conn.session_update(
+                session_id=session_id,
+                update=update,
+            )
+        except Exception:
+            logger.debug("Could not send ACP session info update for %s", session_id, exc_info=True)
+
     def _schedule_usage_update(self, state: SessionState) -> None:
         """Schedule native context indicator refresh after ACP responses."""
         if not self._conn:
@@ -1471,12 +1501,20 @@ class HermesACPAgent(acp.Agent):
             try:
                 from agent.title_generator import maybe_auto_title
 
+                def _notify_title_update(_title: str) -> None:
+                    if conn:
+                        loop.call_soon_threadsafe(
+                            asyncio.create_task,
+                            self._send_session_info_update(session_id),
+                        )
+
                 maybe_auto_title(
                     self.session_manager._get_db(),
                     session_id,
                     user_text,
                     final_response,
                     state.history,
+                    title_callback=_notify_title_update,
                 )
             except Exception:
                 logger.debug("Failed to auto-title ACP session %s", session_id, exc_info=True)