improvement: add detailed output metadata to frontend tools

[bjoaquinc]

📝 Summary

This adds detailed output to the frontend tools framework mirroring the output structure of tools in the backend.

🔍 Description of Changes

• Introduces ToolOutputBase interface and schema to align frontend tools with the backend's SuccessResult pattern from marimo/_ai/_tools/types.py.
• Updates sample-tool to use this structure
• Updates tests to use this structure so they won't break

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Error			Oct 8, 2025 9:49pm