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Fix mcp tool convert, null responseJsonSchema#381

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dpasiukevich merged 3 commits intogoogle:mainfrom
baptmont:convertMCPTool
Dec 9, 2025
Merged

Fix mcp tool convert, null responseJsonSchema#381
dpasiukevich merged 3 commits intogoogle:mainfrom
baptmont:convertMCPTool

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@baptmont baptmont commented Dec 2, 2025

Fix mcp tool convert to only set responseJsonSchema if mcp tool has output schema.

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Summary of Changes

Hello @baptmont, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the conversion logic for MCP tools by ensuring that the ResponseJsonSchema is only populated when an output schema is explicitly defined. This prevents the ResponseJsonSchema from being set to nil unnecessarily, which could lead to incorrect schema representations for tools without an output.

Highlights

  • Conditional Schema Assignment: The convertTool function now conditionally assigns the ResponseJsonSchema field only if an output schema (t.OutputSchema) is explicitly provided.
  • Preventing Null Schema: This change prevents ResponseJsonSchema from being explicitly set to nil when an MCP tool does not define an output schema, ensuring a more accurate representation.
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Code Review

This pull request addresses an issue where responseJsonSchema was being set even for tools without an output schema. The change correctly adds a condition to only set this field if an output schema exists. This is a good fix that improves the robustness of the tool conversion logic. The implementation is clear and correct.

dpasiukevich
dpasiukevich previously approved these changes Dec 2, 2025
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baptmont commented Dec 9, 2025

/gemini review

@baptmont baptmont requested a review from dpasiukevich December 9, 2025 11:46
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Code Review

This pull request correctly addresses a bug where nil schemas in MCP tools could cause a crash when being converted for use with the LLM. The fix prevents nil schema pointers from being assigned to interface fields, which avoids incorrect JSON serialization. The change is logical and well-explained. I've added one comment suggesting the addition of unit tests to cover the fixed scenarios and prevent future regressions.

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LGTM

@dpasiukevich dpasiukevich merged commit 0d0062d into google:main Dec 9, 2025
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davidli2010 pushed a commit to davidli2010/adk-go that referenced this pull request Feb 4, 2026
* Fix mcp tool convert to only set responseJsonSchema if mcp tool has output schema.

* Add comment to mcp convertTool

* Add nil validation for t.InputSchema
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3 participants