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Title: fix: [v1.x backport] skip output schema validation when tool returns isError=True by kimsehwan96 · Pull Request #2467 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: [v1.x backport] skip output schema validation when tool returns isError=True by kimsehwan96 · Pull Request #2467 · modelcontextprotocol/python-sdk

X Title: fix: [v1.x backport] skip output schema validation when tool returns isError=True by kimsehwan96 · Pull Request #2467 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: [v1.x backport] skip output schema validation when tool returns isError=True by kimsehwan96 · Pull Request #2467 · modelcontextprotocol/python-sdk

Open Graph Description: Backport of #2466 to v1.x branch. Skip output schema validation for error results in convert_result(). Motivation and Context When a tool with an inferred output_schema returns CallToolResult(isErr...

X Description: Backport of #2466 to v1.x branch. Skip output schema validation for error results in convert_result(). Motivation and Context When a tool with an inferred output_schema returns CallToolResult(isErr...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2467

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Apr 18, 2026	https://github.com/modelcontextprotocol/python-sdk/pull/2467#issue-4287461212
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April 18, 2026 09:23	https://github.com/modelcontextprotocol/python-sdk/pull/2467#event-24634778658
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fix: skip output schema validation when tool returns isError=True	https://github.com/modelcontextprotocol/python-sdk/pull/2467/commits/a3e240c0769394cfeb3c6b7426d1b162ff6b63ca
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