Google Calendar MCP: update_event is missing colorId parameter

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] 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_