Pydantic AI Tool Registration Patterns - Part 8/15

Full Video: https://www.youtube.com/watch?v=nvNZihH4HXI

Pydantic AI tool registration using custom capability to enforce required tool call before model generation. #pydantic_ai #Python #AI
The `RequireFirstCall` capability inspects the message history (the "scroll of messages") for a `ToolReturnPart` indicating that `get_weather` was successfully called, and only after detecting that return does it stop constraining the model — otherwise it forces the model to call `get_weather` first via `ModelSettings(tool_choice=[self.tool_name])`. This mirrors the koan: the gate reads the scroll for the tool's own return before allowing any other tool to be whispered through.

Видео Pydantic AI Tool Registration Patterns - Part 8/15 канала TyrannoFlow