io.github.mrfentmen/ical-mcp

ical-mcp

Is the io.github.mrfentmen/ical-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-29.

Read, create and validate iCalendar (.ics) data offline: parse events, build RFC 5545 files

alive probed 2026-11-14 · unchanged since 2026-10-29

3tools

626tokens in Claude Opus 5.5

0.3 %of Claude's 200k window

0.2×the median server

209 msto initialize

5 msto list tools

Run it: npx -y @mrfentmen/ical-mcp@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: ical-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 626 tokens in Claude Opus 5.5, exact, measured 2026-10-29. With the Claude Code prefix mcp__…__ on each tool name: 659. The o200k_base estimate is 360. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/awesome-servers
Registry: active, updated 2026-10-28 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.74×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
create_event	311	179	50 %
parse_ical	183	105	29 %
validate_ical	132	76	21 %

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

Servers that mention ical.

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.