Email & Calendar MCP Servers (6)

Calendly

Official MCP

4.5/5Excellent

One of the few schedulers that chose a hosted remote server — no local process, standard OAuth, and it works before you pay.

Loops

Official MCP

4/5Good

Hosted, write-capable and simple — but agent writes here touch your contact list and can trigger campaigns to real people.

Resend

Official MCP

4/5Good

Write action here means mail leaving your domain, irreversibly. Excellent server; use a sending-only key and a test domain first.

Google Workspace

Official MCP

4/5Good

Highest-value, highest-blast-radius connection in the directory: an agent that can read your mail and write your docs. The Google Cloud setup is the price of admission, and no llms.txt anywhere.

Cal.com

Community MCP

3/5Workable

The self-hosted alternative to Calendly, and reportedly the last major scheduler still local-only. Strong API, no first-party hosted MCP endpoint.

Microsoft 365 (Outlook)

Community MCP

2/5Limited

The enterprise mirror image of Google Workspace, with more gates: no dedicated first-party Outlook MCP server confirmed, and nothing happens without an admin.