io.github.mrfentmen/calcom-mcp

calcom-mcp

Is the io.github.mrfentmen/calcom-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

Query Cal.com API v2: event types, bookings, schedules. v1 is decommissioned.

alive probed 2026-11-14 · unchanged since 2026-10-30

10tools

986tokens in Claude Opus 5.5

0.5 %of Claude's 200k window

0.4×the median server

348 msto initialize

10 msto list tools

Run it: npx -y calcom-mcp@1.1.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: calcom-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 986 tokens in Claude Opus 5.5, exact, measured 2026-10-30. With the Claude Code prefix mcp__…__ on each tool name: 1.1k. The o200k_base estimate is 509. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/premium-mcps
Registry: active, updated 2026-10-17 · registry entry
Changes: 2 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.94×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
event_type	120	62	12 %
schedule	116	60	12 %
team_details	116	60	12 %
booking	112	58	11 %
list_event_types	95	49	10 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention calcom or decommissioned or schedules.

We add a row when the result changes. A server with no change keeps its last row.

Probed	Result	Init	Tools	Claude	o200k
2026-10-30 07:48	alive	173 ms	10	986	509
2026-10-23 06:53	alive	348 ms	10		509

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.