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v2.8.0

pydantic/pydantic-aiv2.8.0Jul 10, 2026by dsfaccini

AI Summary

This release introduces enhanced CLI and web UI capabilities while addressing various validation and response handling bugs.

Key Highlights

  • Enhanced CLI: `to_cli()` now supports passing a specific model for agents that don't have a default model set.
  • Web UI Upgrade: The bundled chat UI has been bumped to version 2.0.0 with SDK version 7 targeting.
  • Improved Validation: Added strict validation for Tool, ToolOutput, and Agent timeout parameters.
  • Bug Fixes: Corrected JsonSchemaTransformer recursion and fixed empty/thinking-only response handling.

New Features

  • Allow `to_cli()` to pass `model` for unset-model agents
  • Bump bundled chat UI to `2.0.0` and target `sdk_version=7` in `Agent.to_web()`

Full Release Notes

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

## What's Changed
### 🚀 Features
* Allow `to_cli()` to pass `model` for unset-model agents by @hramezani in https://github.com/pydantic/pydantic-ai/pull/6384
* Bump bundled chat UI to `2.0.0` and target `sdk_version=7` in `Agent.to_web()` by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6296
### 🐛 Bug Fixes
* fix: validate Tool max_retries and timeout parameters by @isheng-eqi in https://github.com/pydantic/pydantic-ai/pull/6375
* fix: validate ToolOutput max_retries by @isheng-eqi in https://github.com/pydantic/pydantic-ai/pull/6377
* fix: validate Agent tool_timeout by @isheng-eqi in https://github.com/pydantic/pydantic-ai/pull/6383
* fix: validate max_queued in ConcurrencyLimit and ConcurrencyLimiter by @isheng-eqi in https://github.com/pydantic/pydantic-ai/pull/6373
* Fix `JsonSchemaTransformer` to recurse into `allOf` composition by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/6394
* Fix empty and thinking-only responses reusing earlier text as the run output by @DouweM in https://github.com/pydantic/pydantic-ai/pull/6403

## New Contributors
* @isheng-eqi made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6375

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v2.7.0...v2.8.0