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Copy file name to clipboardExpand all lines: docs/changelog.md
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!!! note
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Here's a filtered list of the breaking changes for each version to help you upgrade PydanticAI.
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###v0.4.0 (2025-07-08)
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See[#1799](https://github.com/pydantic/pydantic-ai/pull/1799) - Pydantic Evals`EvaluationReport` and`ReportCase` are now generic dataclasses instead of Pydantic models. If you were serializing them using`model_dump()`, you will now need to use the`EvaluationReportAdapter` and`ReportCaseAdapter` type adapters instead.
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See[#1507](https://github.com/pydantic/pydantic-ai/pull/1507) - The`ToolDefinition``description` argument is now optional and the order of positional arguments has changed from`name, description, parameters_json_schema, ...` to`name, parameters_json_schema, description, ...` to account for this.
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###v0.3.0 (2025-06-18)
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See[#1142](https://github.com/pydantic/pydantic-ai/pull/1142) — Adds support for thinking parts.