io.github.mrfentmen/chord-mcp

chord-mcp

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

Build chords and scales from note names locally. No network and no key.

alive probed 2026-11-15 · unchanged since 2026-10-30

2tools

295tokens in Claude Opus 5.5

0.1 %of Claude's 200k window

0.1×the median server

347 msto initialize

10 msto list tools

Run it: npx -y chord-mcp@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: chord-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 295 tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 317. The o200k_base estimate is 165. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/chord-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, 1.79×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
chord_notes	157	88	53 %
scale_notes	138	77	47 %

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

Servers that mention chord.

THIRI Chord Intelligence ai.thiri/chord-intelligence · alive
MusoKit music tools com.musokit/musokit · alive
io.github.MelMayssonOwen/clef · alive
Anchord (AnchorID) io.github.nolenation04/anchord · needs auth
Guitar Practice Routine App — Chord Charts io.github.slshults/gpra-chord-charts · alive
PlayByKey Music Theory com.playbykey/theory-mcp · alive
Chord io.github.getchordlabs/chord · alive
MoltNode by Chord io.github.tuantqse90/moltnode · alive

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.