Pydantic AI v2.43.0 (2026-09-11)
Pydantic AI v2.43.0 introduces a first-run banner for clai sessions and fixes bugs related to tool call text boundary preservation in OpenAIChatModel and Temporal tool opt-out checks.
Why this signal matters
Pydantic AI v2.43.0 includes the following changes: Features: - Add a first-run banner describing the run and open clai sessions with it (PR 7447). Bug Fixes: - Preserve text part boundaries after tool calls in OpenAIChatModel (PR 8235). - Key tool opt-out checks on operation kind instead of an MCP import in Temporal integration (PR 8257).
Actionable summary
Pydantic AI v2.43.0 release adds a first-run descriptive banner for clai sessions (PR 7447), fixes text part boundary preservation after tool calls in OpenAIChatModel (PR 8235), and adjusts Temporal tool opt-out checks to key on operation kind rather than an MCP import (PR 8257).
- Agent usefulness
- 82/100
- Confidence
- 96%
- Canonical data
- JSON + Markdown
What builders should check
- Upgrade to Pydantic AI v2.43.0.
- Verify tool call text part handling when using OpenAIChatModel.
- Review Temporal tool opt-out configurations to ensure compatibility with operation kind checks.