mcpcost

io.github.mrfentmen/nix-packages-mcp

nix-packages-mcp

Is the io.github.mrfentmen/nix-packages-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.

Nix package search from nixpkgs. No key required.

alive probed 2026-11-15 · unchanged since 2026-10-31

1tools
136tokens in Claude Opus 5.5
<0.1 %of Claude's 200k window
0.1×the median server
379 msto initialize
13 msto list tools
Run it
npx -y nix-packages-mcp@1.0.0 (stdio, probed in a container with the network off)
Host
npmjs.com
Reports itself as
nix-packages-mcp 1.0.0
Capabilities
tools
Instructions
none
Of a 1M window
<0.1 % of a 1M context window
Count
136 tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 150. The o200k_base estimate is 72. Counted again when the tool definitions change. Method.
Repository
https://github.com/mrfentmen/nix-packages-mcp
Registry
active, updated 2026-09-21 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.89×.

Tool≈ Claude tokenso200k estimateShare of this server
search13672100 %

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Same tool set as 2 other servers

These registry entries have the same tool names and the same schema sizes.

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mcpcost: alive

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