🐛 Bug: updateEvent operation fails with 'Cannot read properties of undefined (reading 'start')'

[AojdevStudio]

Bug Description

The updateEvent operation in the calendar module fails with the error:

MCP error -32603: Cannot read properties of undefined (reading 'start')

This occurs regardless of how the start/end times are formatted in the parameters.

Steps to Reproduce

1. Create a calendar event using quickAdd:

{
  "operation": "quickAdd",
  "params": {
    "text": "Meeting January 10 2pm-3pm"
  }
}

2. Attempt to update the event to add attendees:

{
  "operation": "updateEvent",
  "params": {
    "eventId": "<event-id>",
    "summary": "Updated Title",
    "description": "Meeting description",
    "start": "2026-01-10T14:00:00-06:00",
    "end": "2026-01-10T15:00:00-06:00",
    "attendees": ["user@example.com"],
    "sendUpdates": "all"
  }
}

Expected Behavior

The event should be updated with the new title, description, and attendees. Invites should be sent to the specified attendees.

Actual Behavior

The operation fails with:

MCP error -32603: Cannot read properties of undefined (reading 'start')

Variations Attempted

All of these parameter formats failed with the same error:

Format 1: ISO string

{
  "start": "2026-01-10T14:00:00-06:00",
  "end": "2026-01-10T15:00:00-06:00"
}

Format 2: Object with dateTime

{
  "start": {"dateTime": "2026-01-10T14:00:00-06:00", "timeZone": "America/Chicago"},
  "end": {"dateTime": "2026-01-10T15:00:00-06:00", "timeZone": "America/Chicago"}
}

Format 3: startTime/endTime

{
  "startTime": "2026-01-10T14:00:00-06:00",
  "endTime": "2026-01-10T15:00:00-06:00"
}

Root Cause Hypothesis

The updateEvent handler likely expects a specific parameter structure but is receiving undefined when accessing params.start or a nested property. The validation/parsing logic may not be handling the input correctly.

Acceptance Criteria

• updateEvent operation successfully updates calendar events
• Attendees can be added to existing events
• sendUpdates parameter sends invites to attendees
• Support both ISO string and object formats for start/end times
• Add input validation with clear error messages for malformed parameters

Technical Notes

File to investigate: src/tools/calendar.ts (or similar)

Related operations that work:

• quickAdd - works correctly
• createEvent - also has issues (different error)
• deleteEvent - works correctly
• getEvent - works correctly

Priority

P2 - Medium (workaround exists: send email invites separately)

[linear]

GDRIVE-9