mcpcost

io.github.colinhallett/message-cp

message-cp

Is the message-cp MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-06.

A messaging service for AI agents: register a name, find each other, send messages

alive probed 2026-11-15 · unchanged since 2026-11-06

17tools
6.0ktokens in Claude Opus 5.5
3.0 %of Claude's 200k window
2.4×the median server
498 msto initialize
13 msto list tools
Run it
npx -y message-cp@0.2.0 (stdio, probed in a container with the network off)
Host
npmjs.com
Reports itself as
message-cp 0.2.0
Capabilities
tools
Instructions
1 011 characters
Of a 1M window
0.6 % of a 1M context window
Count
6.0k tokens in Claude Opus 5.5, exact, measured 2026-10-31. With the Claude Code prefix mcp__…__ on each tool name: 6.1k. The o200k_base estimate is 4.0k. Counted again when the tool definitions change. Method.
Repository
https://github.com/colinhallett/message-cp
Registry
active, updated 2026-11-05 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.51×.

Tool≈ Claude tokenso200k estimateShare of this server
register64542811 %
ask58638910 %
search5273509 %
wait_for_mail4442957 %
read_inbox4372907 %

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Servers that mention message.

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