[BUG] Google Calendar MCP connector: gcal_list_events silently ignores invalid parameters and returns wrong results

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?

When calling gcal_list_events with invalid/alternative parameter names (e.g. start_time, end_time, query, max_results instead of the correct timeMin, timeMax, q, maxResults), the connector accepts these parameters without throwing any error, silently ignores them, and returns completely unrelated results — in this case returning events from 2003 instead of the requested time range (March 2026).

What Should Happen?

The connector should reject unknown parameters with a clear error message, or at minimum return results that respect the intended filtering. Silent failures that return wrong data are very hard to debug and mislead users.

Error Messages/Logs

Steps to Reproduce

1. Connect the Google Calendar MCP connector in Cowork/Claude Code
2. 2. Call gcal_list_events with wrong parameter names, e.g.:
3. gcal_list_events(start_time="2026-03-26T00:00:00", end_time="2026-03-26T23:59:59", max_results=5)
4. 3. No error is returned — instead, the tool returns 50 unrelated events from 2003
5. 4. Using the correct parameter names (timeMin, timeMax, maxResults) returns the expected results

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A (Claude Cowork mode)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Reported via Claude Cowork mode (not Claude Code CLI). The issue is with the Google Calendar MCP connector available in the Anthropic MCP directory.