Pydantic AI Updates: May 9, 2026

1. Pydantic AI 1.93.0 adds tool_choice and output tool events

Pydantic AI. v1.93.0 introduces a tool_choice setting so callers can force, forbid, or pin specific tools per call, and yields new OutputToolCallEvent and OutputToolResultEvent events for output tool execution — useful for streaming UIs and trace inspectors that previously had to infer those transitions. The release also fixes a task-draining bug on agent cancellation, which is the kind of leak that quietly compounds in long-running agent processes. Source