pydantic-ai

v2.12.0 Feature

This release adds 3 notable features for engineering teams evaluating rollout.

Published 10d AI Agents & Assistants

View tool

✓ No known CVEs patched

Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

agent-framework genai llm pydantic python

Summary

AI summary

Updates 🐛 Bug Fixes, 🚀 Features, and feat across a mixed release.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Low	Adds Moonshot AI `kimi-k3` model. Adds Moonshot AI `kimi-k3` model. Source: llm_adapter@2026-07-17 Confidence: high	—
Feature	Low	Emits `EnqueuedMessagesEvent` when messages are delivered. Emits `EnqueuedMessagesEvent` when messages are delivered. Source: llm_adapter@2026-07-17 Confidence: high	—
Feature	Low	Adds `DeferredToolCallEvent` and `DeferredToolResultEvent` to `AgentStreamEvent`. Adds `DeferredToolCallEvent` and `DeferredToolResultEvent` to `AgentStreamEvent`. Source: llm_adapter@2026-07-17 Confidence: high	—
Bugfix
Bugfix	Medium	Fixes `ToolReturnPart` serialization to use field aliases. Fixes `ToolReturnPart` serialization to use field aliases. Source: llm_adapter@2026-07-17 Confidence: high	—
Bugfix	Medium	Fixes tool binding for POSITIONAL_OR_KEYWORD params with `args`. Fixes tool binding for POSITIONAL_OR_KEYWORD params with `args`. Source: llm_adapter@2026-07-17 Confidence: high	—
Bugfix	Medium	Defers streamed output emission when text ends mid-integer-token for Mistral. Defers streamed output emission when text ends mid-integer-token for Mistral. Source: llm_adapter@2026-07-17 Confidence: high	—
Bugfix	Medium	Derives capability-contributed toolset `id` from the capability for durable execution. Derives capability-contributed toolset `id` from the capability for durable execution. Source: llm_adapter@2026-07-17 Confidence: high	—
Bugfix	Medium	Fixes `GoogleModel` per-Part `media_resolution` forwarding in `vendor_metadata`. Fixes `GoogleModel` per-Part `media_resolution` forwarding in `vendor_metadata`. Source: llm_adapter@2026-07-17 Confidence: high	—

Full changelog

What's Changed

🚀 Features

Add Moonshot AI kimi-k3 model by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6551
Emit EnqueuedMessagesEvent when enqueued messages are delivered into the run by @DouweM in https://github.com/pydantic/pydantic-ai/pull/6256
feat: add DeferredToolCallEvent and DeferredToolResultEvent to AgentStreamEvent by @YHallouard in https://github.com/pydantic/pydantic-ai/pull/5588

🐛 Bug Fixes

Fix ToolReturnPart serialization to use field aliases so wire output matches return_schema by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/6543
Fix tool binding for POSITIONAL_OR_KEYWORD params with *args by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/6541
fix(mistral): defer streamed output emission when text ends mid-integer-token by @Mukller in https://github.com/pydantic/pydantic-ai/pull/6519
Derive capability-contributed toolset id from the capability for durable execution by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6408
Fix GoogleModel per-Part media_resolution forwarding in vendor_metadata by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/6525

New Contributors

@Mukller made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6519
@YHallouard made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5588

Full Changelog: https://github.com/pydantic/pydantic-ai/compare/v2.11.0...v2.12.0

View diff on GitHub

Weekly OSS security release digest.

The CVE patches and breaking changes that affected production tools this week. One email, every Sunday.

No spam, unsubscribe anytime.

Share this release

Share on X Share on Bluesky

Track pydantic-ai

Get notified when new releases ship.

About pydantic-ai

AI Agent Framework, the Pydantic way

All releases →