pydantic/pydantic-ai v1.63.0

v1.63.0 (2026-02-23)

on GitHub

What's Changed

🚀 Features

• Add Gemini 3.1 Pro Preview support by @majdalsado in #4372
• feat(gemini): Logprob Support by @DRXD1000 in #4269
• Add args_validator parameter to tools for pre-execution validation by @jerry-reevo in #4016

🐛 Bug Fixes

• Fix Temporal and DBOS MCP to use cached tools instead of fetching each time by @DouweM in #4331
• Updated Cohere content item typing to fix the incompatibility by @DarthJuri in #4384
• Fix Anthropic model on Bedrock incorrectly being treated as supporting json schema output by @vimota in #4369
• fix(pydantic-evals): gracefully handle custom TracerProviders without add_span_processor by @AtharvaJaiswal005 in #4328
• fix: use non-greedy regex in strip_markdown_fences to stop at closing fence by @sksvineeth in #4398
• fix: add defaults for optional fields in OpenRouter streaming models by @majdalsado in #4371
• Set BuiltinToolCallPart.id for OpenAI Responses WebSearch/FileSearch by @yipstar in #4391
• fix: Identify new messages by run_id instead of index by @madanlalit in #4086

New Contributors

• @majdalsado made their first contribution in #4372
• @DarthJuri made their first contribution in #4384
• @AtharvaJaiswal005 made their first contribution in #4328
• @sksvineeth made their first contribution in #4398
• @DRXD1000 made their first contribution in #4269
• @yipstar made their first contribution in #4391

Full Changelog: v1.62.0...v1.63.0