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claude-code - 💡(How to fix) Fix Google Calendar MCP: update_event is missing colorId parameter [1 comments, 2 participants]

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anthropics/claude-code#48288•Fetched 2026-04-16 07:04:01
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muslepower841-designmuslepower841-design
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Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

The update_event tool in the Google Calendar MCP integration is missing the colorId parameter, making it impossible to change event colors programmatically through Claude Code.

What Should Happen?

update_event should support a colorId parameter to allow changing the color of calendar events (e.g., blueberry, tomato, sage), consistent with the Google Calendar API's event resource.

Error Messages/Logs

Steps to Reproduce

  1. Ask Claude to change the color of a calendar event to "blueberry"
  2. Claude calls update_event — no colorId parameter is available
  3. Color change fails silently

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown (worked as of approximately 2026-04-13)

Claude Code Version

2.1.101 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Cursor

Additional Information

No response

extent analysis

TL;DR

The update_event tool in the Google Calendar MCP integration needs to be updated to include the colorId parameter to allow programmatic color changes of calendar events.

Guidance

  • Review the Google Calendar API documentation to confirm the required format and values for the colorId parameter.
  • Modify the update_event tool to accept and pass the colorId parameter to the Google Calendar API.
  • Test the updated update_event tool with different colorId values (e.g., "blueberry", "tomato", "sage") to ensure correct functionality.
  • Verify that the color change is successfully applied to the calendar event and visible in the Google Calendar interface.

Example

No code example is provided due to the lack of specific implementation details in the issue.

Notes

The fix relies on the Google Calendar API's support for the colorId parameter in the event resource. Ensure that the API version used by Claude Code supports this parameter.

Recommendation

Apply workaround: Update the update_event tool to include the colorId parameter, as this is a regression and a previous version supported this functionality.

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#api#tool integration#LLM response#prompt template#agent execution

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