Starstruk Logo MarkStarstruk

v2.3.0

pydantic/pydantic-aiv2.3.0Jul 2, 2026by dsfaccini

AI Summary

Adds native Z.AI (Zhipu AI) provider with thinking support and fixes various bugs regarding Bedrock tool results, HuggingFace file content, and AGUI/Vercel AI message round-trips.

Key Highlights

  • Add native Z.AI (Zhipu AI) provider with thinking support
  • Fix Bedrock tool results to keep non-empty for empty lists
  • Fix HuggingFace to not silently drop file content in tool returns
  • Fix AGUI/Vercel AI message round-trips by preserving tool_kind and vendor_metadata

New Features

  • Native Z.AI (Zhipu AI) provider with thinking support
  • Durable-exec MCP get_tools caching replay-deterministic

Full Release Notes

<!-- Release notes generated using configuration in .github/release.yml at main -->

## What's Changed
### 🚀 Features
* Add native Z.AI (Zhipu AI) provider with thinking support by @eliasaronson in https://github.com/pydantic/pydantic-ai/pull/4273
### 🐛 Bug Fixes
* fix(test): set `provider_name` on `TestModel` non-streaming responses by @syf2211 in https://github.com/pydantic/pydantic-ai/pull/6066
* Keep Bedrock tool results non-empty for empty lists by @Whning0513 in https://github.com/pydantic/pydantic-ai/pull/6155
* fix(huggingface): don't silently drop file content in tool returns by @HaozheZhang6 in https://github.com/pydantic/pydantic-ai/pull/5881
* fix: skip OpenAI thinking-only chat history messages by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/6182
* Don't send `defer_loading` without `tool_search` on models without native tool search by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/6144
* Route remaining instrumentation serialization through `safe_to_json` by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6073
* fix: reconstruct multimodal `ToolReturnPart.content` via a `ToolReturnContent` discriminator by @DouweM in https://github.com/pydantic/pydantic-ai/pull/6191
* Fix `AGUIAdapter.dump_messages` reordering `ToolReturnPart` after `UserPromptPart` by @amarjaleelbanbhan in https://github.com/pydantic/pydantic-ai/pull/5969
* fix: track `new_messages()` boundary by position so a rebuilt resumed request isn't leaked by @klplentific in https://github.com/pydantic/pydantic-ai/pull/6034
* Preserve `tool_kind` in Vercel AI and AG-UI message round-trips by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/5873
* Make durable-exec MCP `get_tools` caching replay-deterministic by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/5883
* Preserve `FilePart.content.vendor_metadata` in AG-UI and Vercel AI adapter round-trips by @Navaneethp007 in https://github.com/pydantic/pydantic-ai/pull/6095
* Resolve dynamic toolset `get_instructions` in an activity under Temporal by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/5925

## New Contributors
* @Whning0513 made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6155
* @eliasaronson made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4273
* @amarjaleelbanbhan made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5969
* @klplentific made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6034
* @Navaneethp007 made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6095

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v2.2.0...v2.3.0