Multi Calendar — Claude Code MCP server: what it does, how to install
Connects Google and Microsoft calendars behind one endpoint for your AI client. Checks overlapping free slots and schedules meetings.
claude mcp add --transport http calendar https://calendar.lumman.co/mcpWhat Multi Calendar does
This remote endpoint pulls together Outlook, Microsoft 365, and Google accounts into one feed at https://calendar.lumman.co/mcp. Your agent inspects open slots across all calendars in a single request instead of checking them separately. Invitation text runs through Google Cloud Model Armor to block prompt injection threats.
You must link your calendars at https://lumman.co/mcp/account/multi-calendar beforehand. Without authenticating via your browser on the first run, the server rejects requests. The service fetches events straight from upstream APIs without keeping calendar copies on its own servers.
What it helps with
- find mutual open slots across separate work and personal schedules
- prepare meeting drafts and send invites upon approval
- spot scheduling conflicts and unanswered invites for the current week
- generate booking links and group scheduling polls
Example prompts for the agent
- When am I free for an hour on Friday across all my calendars?
- Draft a 30-minute sync with [email protected] for tomorrow at 15:00 using Microsoft 365
- Check my schedule for collisions and pending invites this week
How to install Multi Calendar
Platform CLI: remote server
claude mcp add --transport http calendar https://calendar.lumman.co/mcpPlatform CLI: remote server
codex mcp add multi-calendar --url https://calendar.lumman.co/mcpConfig file
{
"mcpServers": {
"multi-calendar": {
"url": "https://calendar.lumman.co/mcp"
}
}
}Config file
{
"servers": {
"multi-calendar": {
"type": "http",
"url": "https://calendar.lumman.co/mcp"
}
}
}Platform CLI: remote server
gemini mcp add -t http multi-calendar https://calendar.lumman.co/mcpStep by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about Multi Calendar
How to install Multi Calendar in Claude Code?
Run claude mcp add --transport http multi-calendar https://calendar.lumman.co/mcp. When you trigger your first request, follow the browser prompt to log in.
What does Multi Calendar do?
It exposes Google and Microsoft calendar accounts through a unified MCP endpoint. The agent inspects events, spots open slots, and organizes meeting invites in one place.
Does the server store personal calendar entries?
No persistent copies remain on the server. Entries are pulled on demand from Google or Microsoft whenever your client requests them.
