meeting-scheduler-mcp 1.1.0

MCP server for cross-organisation meeting scheduling via Google and Microsoft calendars

meeting-scheduler-mcp

An MCP server that schedules meetings across organisations by querying free/busy calendars from Google and Microsoft accounts — without exposing anyone's calendar data to the other party.

Works with Claude Desktop, Cursor, and any MCP-compatible client.

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How it works

You configure one primary account (the calendar where events are created and invites sent) and one or more shadow accounts (read-only access to query free/busy within another org's tenant).

Claude uses the MCP tools to:

1. Find slots where everyone is free
2. Book the meeting from your primary calendar
3. Reschedule or cancel if plans change

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Prerequisites

Google account

1. Go to Google Cloud Console → APIs & Services → Credentials
2. Create a project (or use an existing one)
3. Enable the Google Calendar API
4. Create an OAuth client ID — application type: Desktop app
5. Download the client ID and client secret

Microsoft / Outlook account

1. Go to Azure Portal → App registrations
2. Register a new application — supported account types: Accounts in any organizational directory and personal Microsoft accounts
3. Under Authentication, add a Mobile and desktop application redirect URI: http://localhost
4. Note the Application (client) ID — no client secret needed for delegated auth

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Installation

Recommended — zero install via uvx

uvx meeting-scheduler-mcp setup

This runs the setup wizard without permanently installing anything. Once configured, Claude Desktop launches the server automatically using the same uvx command.

Alternative — pip

pip install meeting-scheduler-mcp
meeting-scheduler setup

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Setup wizard

Run the wizard once to configure your accounts and authorise them:

$ uvx meeting-scheduler-mcp setup

Meeting Scheduler — Setup Wizard
==================================================

This wizard will:
  1. Collect your calendar account details
  2. Write ~/.config/meeting-scheduler/config.toml
  3. Open a browser to authorise each account

The wizard asks for each account's email, provider (google/microsoft), and OAuth credentials, then opens a browser window for each one.

After setup, re-authorise a single account at any time:

uvx meeting-scheduler-mcp auth [e-mail]

Check that all accounts are connected:

uvx meeting-scheduler-mcp status

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Claude Desktop configuration

Add this to your Claude Desktop MCP config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

{
  "mcpServers": {
    "meeting-scheduler": {
      "command": "uvx",
      "args": ["meeting-scheduler-mcp"]
    }
  }
}

Restart Claude Desktop. You should see the meeting-scheduler tools available.

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Configuration file

The wizard writes ~/.config/meeting-scheduler/config.toml. You can also edit it directly:

[[accounts]]
org           = "Acme Corp"
email         = "[e-mail]"
provider      = "google"
is_primary    = true
client_id     = "YOUR_GOOGLE_CLIENT_ID.apps.googleusercontent.com"
client_secret = "YOUR_GOOGLE_CLIENT_SECRET"

[[accounts]]
org        = "Partner Inc"
email      = "[e-mail]"
provider   = "microsoft"
is_primary = false
client_id  = "YOUR_AZURE_APP_CLIENT_ID"

[rules]
default_duration_minutes      = 30
buffer_before_minutes         = 0
buffer_after_minutes          = 15
default_working_hours_start   = "09:00"
default_working_hours_end     = "17:00"
working_days                  = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]
advance_notice_hours          = 24
max_days_ahead                = 30
slot_limit                    = 10

Set MEETING_SCHEDULER_CONFIG to use a different path:

export MEETING_SCHEDULER_CONFIG=/path/to/my-config.toml

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Available MCP tools

Tool	Description
find_available_slots	Find free slots for all participants within a time window
book_meeting	Create a calendar event and send invites
reschedule_meeting	Move an existing event to a new time
cancel_meeting	Delete an event
list_accounts	Show configured accounts and connection status
health_check	Verify all accounts can authenticate

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Token security

Credentials are stored locally and never sent anywhere except the respective calendar provider:

• Google — refresh token is AES-256-GCM encrypted; the encryption key lives in an ACL-locked macOS Keychain item (or DPAPI-protected blob on Windows) that only this process can read
• Microsoft — token cache managed by msal-extensions, stored in macOS Keychain (ACL-locked) or a DPAPI-encrypted file on Windows

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Development

git clone https://github.com/shathish/meeting-scheduler-mcp
cd meeting-scheduler-mcp
pip install -e ".[dev]"
pytest tests/

To run the server locally against Claude Desktop, point the config at the repo:

{
  "mcpServers": {
    "meeting-scheduler": {
      "command": "python3",
      "args": ["/path/to/meeting-scheduler-mcp/mcp_server.py"]
    }
  }
}

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License

MIT — see LICENSE