Pydantic AI tool integration boundary

Evidence-backed facts

1. Pydantic AI exposes registered Python functions and toolsets to supported models with typed arguments and dependency context. informative
2. The agent runtime validates a requested call, executes application code, can retry validation failures, and returns the function result to the model. informative
3. Run context, dependencies, secrets, external clients, retry policy, and approval for mutations remain application-owned. informative
4. Type validation reduces malformed inputs but does not prove business authorization, safe side effects, factual results, external success, or deployment. informative

Primary sources