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v1.79.0

pydantic/pydantic-aiv1.79.0Apr 10, 2026by DouweM

AI Summary

Adds full support for AG-UI versions 0.1.13 and 0.1.15 and refactors the HTTP client to use a context manager for better resource management. It also adds an `apply()` method to capability classes.

Key Highlights

  • Full support for AG-UI 0.1.13 and 0.1.15
  • Replace HTTP client cache with `create_async_http_client` and context manager
  • Add `apply()` to AbstractCapability, CombinedCapability, and WrapperCapability

New Features

  • AG-UI support
  • HTTP client context manager
  • apply() method for capabilities

Full Release Notes

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

## What's Changed
### 🚀 Features
* Full support for AG-UI 0.1.13 and 0.1.15: reasoning, multi-modal, `dump_messages` by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/3971
* Replace HTTP client cache with `create_async_http_client` and context manager by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/4421
* Add `apply()` to `AbstractCapability`, `CombinedCapability`, and `WrapperCapability` by @DouweM in https://github.com/pydantic/pydantic-ai/pull/5022
### 🐛 Bug Fixes
* fix: update internal `$ref`s in renamed schema `defs`, handle missing keywords, and detect semantically different defs by @Ricardo-M-L in https://github.com/pydantic/pydantic-ai/pull/5020
* fix: force streaming in `run()` when capability/hook overrides `wrap_run_event_stream` by @DouweM in https://github.com/pydantic/pydantic-ai/pull/5028
* Fix `on_node_run_error` and `after_node_run` hook recovery by @DouweM in https://github.com/pydantic/pydantic-ai/pull/5023
* fix: add missing space in provider `UserError` messages by @graydeon in https://github.com/pydantic/pydantic-ai/pull/4976

## New Contributors
* @15r10nk made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4108
* @graydeon made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4976

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.78.0...v1.79.0