ProductivityMCP Registryremote21 toolsB · 73

Multi Calendar MCP server

Name: Multi Calendar
Author: lumman.co

co.lumman · Updated 10d ago

Outlook.com, Microsoft 365, Google calendars: free time, events, invitations, booking pages, polls.

At a glance

Multi Calendar is an MCP server in the Productivity category. It is hosted remotely and connects over HTTP, and declares no required credentials. It exposes 21 tools, including calendars_list, events_list and events_get. It scores B (73/100) on the MCP Skills Hub health score as of Oct 28, 2026.

Source 0

One-click install

VS Code VS Code Insiders Cursor

Opens your editor and pre-fills the config. Your editor will ask before adding it.

How to install Multi Calendar in your AI client

Setup for Claude Code, Claude Desktop, Cursor, Codex, Windsurf, Cline and VS Code — copy-paste ready.

How to install Multi Calendar in Claude CodeAnthropic's agentic CLI

Add the server

bash

claude mcp add --transport http calendar https://calendar.lumman.co/mcp

2
Verify it's connected
bash
```
claude mcp list
```
Sharing it with your team?
Add `--scope project` to write it to .mcp.json in the repository root, which you can commit (with the secrets left as environment variables).
Use it in a session
Ask Claude to use the tools this server exposes (e.g. calendars_list, events_list, events_get). It discovers them automatically.

How to install Multi Calendar in Claude DesktopDesktop app (MCP config)

Open your MCP config
macOS: ~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

Add this server

json

{
  "mcpServers": {
    "calendar": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://calendar.lumman.co/mcp"
      ]
    }
  }
}

Why the wrapper?
This is a remote (HTTP) server and Claude Desktop only launches local processes, so mcp-remote proxies the connection. It will open a browser window if the server needs OAuth.
Restart Claude Desktop
The tools appear under the 🔌 menu once the app reloads.

How to install Multi Calendar in CursorAI-first code editor

Create / edit .cursor/mcp.json in your project

json

{
  "mcpServers": {
    "calendar": {
      "url": "https://calendar.lumman.co/mcp"
    }
  }
}

Enable it
Cursor Settings → MCP → toggle the server on. Tools become available to the Composer/Agent.

How to install Multi Calendar in Codex CLIOpenAI coding agent

Add to ~/.codex/config.toml

toml

[mcp_servers.calendar]
command = "npx"
args = ["-y", "mcp-remote", "https://calendar.lumman.co/mcp"]

Why the wrapper?
Codex runs MCP servers as local processes, so mcp-remote bridges this HTTP endpoint to stdio.
Run Codex
Codex loads MCP servers from config.toml on startup and exposes their tools to the agent.

How to install Multi Calendar in WindsurfCodeium's agentic IDE

Edit ~/.codeium/windsurf/mcp_config.json

json

{
  "mcpServers": {
    "calendar": {
      "serverUrl": "https://calendar.lumman.co/mcp"
    }
  }
}

Reload
Windsurf → Cascade → refresh MCP servers. Cascade can now call the tools.

How to install Multi Calendar in ClineVS Code autonomous agent

Open Cline → MCP Servers → Configure
Adds to cline_mcp_settings.json.

Add the server

json

{
  "mcpServers": {
    "calendar": {
      "type": "streamableHttp",
      "url": "https://calendar.lumman.co/mcp"
    }
  }
}

How to install Multi Calendar in VS CodeCopilot / MCP support

Create .vscode/mcp.json

json

{
  "servers": {
    "calendar": {
      "type": "http",
      "url": "https://calendar.lumman.co/mcp"
    }
  }
}

Start it
VS Code shows a ▶ Start action above the server entry. Agent mode (Copilot Chat) can then use the tools.

What tools does Multi Calendar expose? (21)

Taken from the project's README — the server itself was not queried, so check its docs for the exact schemas.

calendars_listList calendars
events_listRead events
events_getRead an event
free_times_findFind a time
events_createCreate an event
events_editChange an event
events_cancelCancel an event
events_respondAnswer an invitation
preferences_getRead scheduling preferences
preferences_setChange scheduling preferences
busy_everywhere_setShow busy time everywhere
booking_links_createMake a booking link
booking_page_setSet up a booking page
polls_createMake a group poll
polls_resultsRead a poll's answers
polls_bookBook a poll's time
links_polls_listList open links and polls
links_polls_closeClose a link or poll
circles_inviteInvite people into a circle
circles_listList circles
circles_free_times_findFind a time for a circle

What the code can do

This is a remote server — nothing is installed or run on your machine, so there is no local code to analyze. What it can reach is described above: your requests go to the provider's host.

Before you install

Signals gathered from the source repo and package registry — not a safety verdict.

What it can reach

Third-party hosted service — Your requests and any data in them are sent to calendar.lumman.co.
No local execution — Nothing is installed or run on your machine.

Last commit 8 days ago — Actively maintained.
Repository created 10 days ago — Very new project with little track record yet.
0 GitHub stars — Very little community usage so far.

Client compatibility

Claude Code: NativeClaude Desktop: Via mcp-remoteCursor: NativeCodex CLI: Via mcp-remoteWindsurf: NativeCline: NativeVS Code: Native

Health score

B · 73

Maintenance, adoption, transparency and packaging — not a safety audit. How this is calculated

Maintenance30%100%
Last commit 8 days ago.
Adoption20%0%
0 stars.
Transparency20%100%
4/4: ✓ public source repo, ✓ declared license, ✓ documentation, ✓ discoverable tool list.
Provenance15%75%
Links to its own repository; package linkage unverified.
Packaging15%75%
Remote endpoint; authentication requirements not declared.

Documentation

Full README

Multi Calendar

Outlook.com, Microsoft 365, Google calendars: free time, events, invitations, booking pages, polls.

Multi Calendar is a remote MCP server run by Lumman Ltd. It puts every calendar account you connect - Outlook.com and Hotmail, Microsoft 365 and Google, several of each - behind one connector, so an AI client can find time free in all of them in one call, read and change events, answer invitations, and hand out booking links, booking pages and group polls. This repository holds what clients install: the manifests for Claude Code, Cursor, Gemini CLI and Antigravity, three skills and their evals. The server itself is not in it.

Before you start

You need a Lumman account with at least one calendar account connected - in the window your AI client opens when it first connects, or at https://lumman.co/mcp/account/multi-calendar. Sign in there with Google, Microsoft, a passkey or an emailed code. Outlook.com, Hotmail and Microsoft 365 calendars connect with Microsoft sign-in, Google calendars with Google sign-in. Each calendar account's permissions - seeing events, changing events, and inviting and replying - are set on the same page, and your time zone, working hours and other scheduling preferences on its Scheduling page, https://lumman.co/mcp/account/multi-calendar/scheduling.

Add it to your client

Claude

Open Multi Calendar in Claude's connectors directory, https://claude.ai/directory/connectors/lumman-multi-calendar, and press Connect. The listing connects at https://calendar.lumman.co/mcp.

Claude Code

text

/plugin marketplace add lumman-lab/multi-calendar
/plugin install multi-calendar@multi-calendar

The plugin adds the connector at https://calendar.lumman.co/mcp and the three skills below. The first time a skill reaches the connector, Claude Code asks you to sign in; if it does not, run /mcp and choose the multi-calendar server.

Cursor

Add the connector to ~/.cursor/mcp.json:

json

{
  "mcpServers": {
    "multi-calendar": { "url": "https://calendar.lumman.co/mcp" }
  }
}

Excerpt — the full document is on GitHub.

Alternatives to Multi Calendar

Maintain Multi Calendar? Add a badge to your README

Shows its health grade, and links readers to install steps for every client.

markdown

[![Multi Calendar on MCP Skills Hub](https://mcp-skills-hub.vercel.app/badge/co-lumman-calendar)](https://mcp-skills-hub.vercel.app/mcps/co-lumman-calendar)

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