pydantic-ai
https://github.com/pydantic/pydantic-ai
Python
GenAI Agent Framework, the Pydantic way
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- Issues
- [roundtrip-sweep] AG-UI adapter: ToolReturnPart.outcome silently dropped on round-trip (failed/denied load as success)
- Anthropic mapper re-renders unsigned/foreign `ThinkingPart`s as literal `<thinking>` text in the prompt — model mimics it and leaks reasoning into user-visible answers
- `TemporalMCPServer.get_tools` tool-definition cache breaks workflow replay determinism (TMPRL1100)
- Preserve `tool_kind` in Vercel AI and AG-UI message round-trips
- GraphBuilder API does not preformat OTel span names (`run node {node_id}` / `run graph {graph.name}` left as literal templates)
- Stream and run cancellation semantics tracker
- Map `seed` and `top_k` ModelSettings for GeminiModel
- Define whole-agent-run cancellation semantics
- Define replay semantics for interrupted message histories
- Define tool-execution cancellation semantics
- Docs
- Python not yet supported