Support Vercel AI Data Stream Protocol #2923
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This would be a wonderful addon, looking forward to see it soon in main. |
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@samuelcolvin can you add it to docs such that it would be integrated as chat service in existing Fullstack apps that uses pydantic-ai as Agent stack. |
samuelcolvin
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Sep 16, 2025
183amir
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Thanks a lot for this! I left some comments on the code and I will try to test this and get back.
pydantic_ai_slim/pydantic_ai/vercel_ai_elements/request_types.py
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# Conflicts: # examples/pydantic_ai_examples/chat_app.py # pydantic_ai_slim/pydantic_ai/agent/abstract.py # pydantic_ai_slim/pydantic_ai/run.py
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# Conflicts: # pyproject.toml # tests/models/test_deepseek.py # tests/models/test_huggingface.py # uv.lock
# Conflicts: # docs/ui/ag-ui.md # examples/pydantic_ai_examples/ag_ui/api/agentic_chat.py # examples/pydantic_ai_examples/ag_ui/api/tool_based_generative_ui.py
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To do:
clai weborAgent.to_web()?This adds support for Vercel AI Elements streams to Pydantic AI.
There's an example frontend in a separate repo github.com/pydantic/pydantic-ai-chat the plan is to either make that into a more complete template, or release a
pydantic-ai-chatpython library which contains a pre-built react frontend.@DouweM we should rename this to use the proper terminology of the "Vercel AI Data Stream Protocol"
Here's a demo of basic usage:
pydantic-ai-chat.mp4