#AG-UI adapter for Pydantic Graph

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onyx agate
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If you want to connect to a LanGraph in FastAPI, there's the following:

from copilotkit import langgraph_agui_agent

Pydantic have recently released their v2 Graph, and I now have several implementations of CopilotKit working with it. However, I had to roll my own adapter, which isn't ideal.

Does anyone know if there's plans to create something similar to langgraph_agui_agent for Pydantic Graph?

Btw, I did raise a feature request on Pydantic AI's GitHub: https://github.com/pydantic/pydantic-ai/issues/5492.

I'm happy to raise a FR for CopilotKit too, and cross-reference to the one above, but I wanted to check in first.

Thanks

Ian

GitHub
Issues · pydantic/pydantic-ai

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This solution has been AI generated

There isn't a built-in AG-UI adapter for Pydantic AI v2 Graph in CopilotKit today. CopilotKit supports Pydantic AI Agents via AG-UI, and provides a LangGraph-specific adapter, but no equivalent for Pydantic Graph is present or documented. Filing a feature request in CopilotKit (cross-referencing your Pydantic AI issue) is the right next step.

Current status

  • No PydanticGraphAGUIAgent (or similar) exists in the CopilotKit Python SDK.
  • CopilotKit includes a specialized LangGraph adapter (e.g., langgraph_agui_agent) to bridge LangGraph to AG-UI.
  • Existing Pydantic AI integrations in the repo use standard Agents, not the new Graph API.

What works today with Pydantic AI

You can expose standard Pydantic AI Agents to AG-UI:

from pydantic_ai import Agent
from pydantic_ai.ag_ui import StateDeps

agent = Agent(...)
app = agent.to_ag_ui(deps=StateDeps(MyState()))

Recommendation

  • Please open a Feature Request in CopilotKit and reference your Pydantic AI issue. A native adapter would need to:
    • Translate Pydantic Graph state transitions to AG-UI protocol events.
    • Support shared state, manual message emission, and state snapshots similar to the LangGraph adapter.

References

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onyx agate