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v1.78.0

pydantic/pydantic-aiv1.78.0Apr 8, 2026by DouweM

AI Summary

Adds observability features for OpenTelemetry and expands tool definition capabilities with new metadata and schema attributes. This enhances tracing and tool introspection.

Key Highlights

  • Add cached token span attributes per OTel spec
  • Add `return_schema` and `function_signature` to ToolDefinition
  • Add `SetToolMetadata` capability

New Features

  • OTel token span attributes
  • ToolDefinition schema additions
  • SetToolMetadata capability

Full Release Notes

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

## What's Changed
### 🚀 Features
* Add cached token span attributes per OTel spec by @alexmojaki in https://github.com/pydantic/pydantic-ai/pull/5013
* feat: add `return_schema` and `function_signature` to `ToolDefinition` by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/4964
* feat: add `SetToolMetadata` capability by @DouweM in https://github.com/pydantic/pydantic-ai/pull/4964

## New Contributors
* @Ricardo-M-L made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4968
* @chernistry made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5005
* @vladdoster made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4620
* @edmcman made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4584
* @drPod made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4809
* @1Ninad made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4945

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.77.0...v1.78.0