get_recall_memory_summary - TypeError: object of type 'MessageManager' has no len()

[robstoof]

I get this error with the code below and also with the curl command through the swagger UI or from the terminal. After this error ollama went wild and my agents where all gone after that.

client.get_recall_memory_summary(agent_state.id)

TypeError: object of type 'MessageManager' has no len()
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "/app/.venv/lib/python3.11/site-packages/uvicorn/protocols/http/h11_impl.py", line 408, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/uvicorn/middleware/proxy_headers.py", line 84, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/fastapi/applications.py", line 1054, in call
await super().call(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/applications.py", line 113, in call
await self.middleware_stack(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/middleware/errors.py", line 187, in call
raise exc
File "/app/.venv/lib/python3.11/site-packages/starlette/middleware/errors.py", line 165, in call
await self.app(scope, receive, _send)
File "/app/.venv/lib/python3.11/site-packages/starlette/middleware/cors.py", line 85, in call
await self.app(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/middleware/exceptions.py", line 62, in call
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/app/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/app/.venv/lib/python3.11/site-packages/starlette/routing.py", line 715, in call
await self.middleware_stack(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/routing.py", line 735, in app
await route.handle(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/routing.py", line 288, in handle
await self.app(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/routing.py", line 76, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File "/app/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/app/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/app/.venv/lib/python3.11/site-packages/starlette/routing.py", line 73, in app
response = await f(request)
^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/fastapi/routing.py", line 301, in app
raw_response = await run_endpoint_function(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/fastapi/routing.py", line 214, in run_endpoint_function
return await run_in_threadpool(dependant.call, **values)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/starlette/concurrency.py", line 39, in run_in_threadpool
return await anyio.to_thread.run_sync(func, *args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/anyio/to_thread.py", line 56, in run_sync
return await get_async_backend().run_sync_in_worker_thread(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 2505, in run_sync_in_worker_thread
return await future
^^^^^^^^^^^^
File "/app/.venv/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 1005, in run
result = context.run(func, *args)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/letta/server/rest_api/routers/v1/agents.py", line 360, in get_agent_recall_memory_summary
return server.get_recall_memory_summary(agent_id=agent_id, actor=actor)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/letta/server/server.py", line 909, in get_recall_memory_summary
return RecallMemorySummary(size=len(agent.message_manager))
^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: object of type 'MessageManager' has no len()

[cpacker]

Hi @robstoof , thank you for the bug report!

This is fixed in the latest main, but isn't fixed yet in the latest release.

E.g. the bug exists in 0.6.6, but doesn't exist here.

Looking at your error trace it seems like you installed via pip - if that's the case, you can grab the latest code with pip install -U letta-nightly (you probably need to run pip uninstall letta first since they occupy the same package namespace). If you use Docker, you can similarly use the nightly Docker container instead of the versioned one.

Thanks again for reporting this, we'll try and get a bugfix release for 0.6.7 out the door ASAP because of this.