# Multi Calendar

Connects Google and Microsoft calendars behind one endpoint for your AI client. Checks overlapping free slots and schedules meetings.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: lumman-lab
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/lumman-lab/multi-calendar
- Updated: 2026-10-20
- HTML: https://affpapa.org/en/nevibecode/mcp/multi-calendar

## What it 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.

## Requirements
- Remote server: `https://calendar.lumman.co/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http calendar https://calendar.lumman.co/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add multi-calendar --url https://calendar.lumman.co/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "multi-calendar": {
            "url": "https://calendar.lumman.co/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "multi-calendar": {
            "type": "http",
            "url": "https://calendar.lumman.co/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http multi-calendar https://calendar.lumman.co/mcp
```

## When to use it
- 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
- When am I free for an hour on Friday across all my calendars?
- Draft a 30-minute sync with alex@example.com for tomorrow at 15:00 using Microsoft 365
- Check my schedule for collisions and pending invites this week

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