Fix agent invocation missing thread_id in scheduler and cron trigger

The checkpointer requires a thread_id in configurable. Use stable IDs
derived from the message/job ID so each has its own checkpoint thread.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

blueprints/cron/__init__.py

@@ -138,7 +138,8 @@ async def trigger_job(job_id: str):
 
     try:
         response = await current_app.main_agent.ainvoke(
-            {"messages": [{"role": "user", "content": job.prompt}]}
+            {"messages": [{"role": "user", "content": job.prompt}]},
+            config={"configurable": {"thread_id": f"cron-{job.id}"}},
         )
         result = response.get("messages", [])[-1].content
 

blueprints/scheduled_messages/scheduler.py

@@ -14,9 +14,10 @@ RECURRENCE_DELTAS = {
 }
 
 
-async def _run_agent(prompt: str) -> str:
+async def _run_agent(prompt: str, thread_id: str) -> str:
     response = await current_app.main_agent.ainvoke(
-        {"messages": [{"role": "user", "content": prompt}]}
+        {"messages": [{"role": "user", "content": prompt}]},
+        config={"configurable": {"thread_id": thread_id}},
     )
     return response.get("messages", [])[-1].content
 
@@ -60,7 +61,7 @@ async def process_due_messages() -> dict:
             send_content = msg.content
 
             if msg.use_agent:
-                send_content = await _run_agent(msg.content)
+                send_content = await _run_agent(msg.content, f"scheduled-{msg.id}")
 
             if msg.channel == MessageChannel.IMESSAGE:
                 from blueprints.imessage import send_imessage