‼️ `create_swarm` causes 'StateGraph' object has no attribute 'schema'

[XinyueZ]

Hey,

I just updated to the latest versions of langchain, langgraph, and langgraph-sdk,

but now the latest swarm no longer works with create_swarm.

I think there were breaking changes.

Best regards.

[garydevenay]

Seeing the same issue

  File "xxx/.venv/lib/python3.12/site-packages/langgraph_swarm/swarm.py", line 211, in create_swarm
    add_active_agent_router(
  File "xxx/.venv/lib/python3.12/site-packages/langgraph_swarm/swarm.py", line 124, in add_active_agent_router
    channels = builder.schemas[builder.schema]
                               ^^^^^^^^^^^^^^
AttributeError: 'StateGraph' object has no attribute 'schema'. Did you mean: 'schemas'?

[uesleipedro]

Same problem here. Has anyone found a solution?

[uesleipedro]

in release 0.5.0 of langgraph, it makes state_schema mandatory. However, I don't know how to fix it. Behind the scenes, swarm is probably not passing this parameter which is now mandatory

https://github.com/langchain-ai/langgraph/releases

[aragop25]

Yes also facing this issue, please advise

[uesleipedro]

Yes also facing this issue, please advise

Until the problem is solved, you can use langgraph version 0.3.34 and langgraph-swarm 0.0.10. It worked for me

[XinyueZ]

@vbarda

[ivanromero2708]

Having the same issue... Dont want to go back to previous langgraph versions

[jonascsantos]

Fix seems to be as simple as this:

-    channels = builder.schemas[builder.schema]
+   channels = builder.schemas[builder.state_schema]

#86

Am I missing something?