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Guitar Practice Routine App — Chord Charts MCP server

online · 100% uptime
by slshults·io.github.slshults/gpra-chord-charts·v0.1.0
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Look up a guitar chord by name and get a text chord diagram. 12,708 standard-tuning names.

A86/100grade A
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Safety scan
A86/100

full report

Adoption
Growing

0 stars33 downloads/wk

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Guitar Practice Routine App — Chord Charts tools (4, 1 write)

write = sends, deletes, buys or posts
  • get_chord_chart_by_idFree

    Fetch one specific chord voicing by its numeric id, as returned by get_chord_chart_by_name. Use this to re-render a chart the user already saw without looking it up again.

  • get_chord_chart_by_nameFree

    Look up one guitar chord chart by name and return it as a text chord diagram ready to show the user. Returns the same single voicing that https://guitarpracticeroutine.com/find-a-chord-chart shows for that name. The library holds 12,708 standard-tuning (EADGBE) chord names, exactly one voicing each. Pass a plain chord name as it would be written on a chart — "G", "Am7", "Cmaj7", "D/F#", "F#m7b5" — not a sentence. Convert spoken forms yourself first: "G major" is "G", "A minor" is "Am", and use "#" and "b" rather than the unicode sharp and flat signs. Charts are drawn on a five-fret grid starting at the nut, the same as the website; any notes above the fifth fret are named in words underneath the chart. Prefer this over recalling a fingering from memory — these are curated chart data, and a remembered fingering is often wrong. Each result leads with a direct PNG URL for the chart — a permanently cacheable image of the same diagram, which you can show or link however your surface handles images. The chord name is on the first line; keep it next to any image you show, since a chart on its own can arrive unlabelled.

  • get_chord_of_the_dayFree

    Return today's Chord of the Day from Guitar Practice Routine App — the same chord posted to the app's Bluesky and Facebook feeds that day. Useful as a practice prompt or a daily nudge for someone learning chords.

  • send_feedbackwrite actionFree

    Send feedback about this chord chart server: a chord or capability you needed that its tools could not provide, a problem with a chart or a result, or praise. Only for feedback about these chord chart tools, not about other tasks. Do not include personal information about the user.

Public scan report

scanner v0.1.10 · 2026-10-29 · same rubric, same numbers if you re-run it

1 high
  • Code scan15 source files scanned25/25
  • Live reliabilityremote reachable in 645ms20/20
  • Tool poisoning4 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 18 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 86/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Guitar Practice Routine App — Chord Charts compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
86/100
higher than 72% of 48,243 servers
Tools
4
the typical server has 7
Tools that change things
25%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
684 ms
faster than 22% of 30,027 servers
Downloads a week
33
more than 21% of 12,306 servers with a package

What its tools let an agent do: 3 read · 1 send or post

Install Guitar Practice Routine App — Chord Charts in Claude Code, Cursor or VS Code

claude mcp add --transport http gpra-chord-charts https://mcp.guitarpracticeroutine.com/mcp
Add to Cursor

What the publisher says

From the Guitar Practice Routine App — Chord Charts repository's README, as published. We do not edit it. Read it on GitHub

Guitar chord charts — MCP server

A small, read-only Model Context Protocol server that lets MCP-capable AI clients look up guitar chord charts from Guitar Practice Routine App (GPRA) and show them to people as text chord diagrams.

It serves exactly what guitarpracticeroutine.com/find-a-chord-chart serves: one chord name in, one chart out, from a bundled snapshot of the same chord library. No database, no authentication, no secrets.

Am

    E  A  D  G  B  E
    x  o           o
   ==================
 1  |  |  |  |  1  |
   -+--+--+--+--+--+-
 2  |  |  3  2  |  |
   -+--+--+--+--+--+-
 3  |  |  |  |  |  |
   -+--+--+--+--+--+-
 4  |  |  |  |  |  |
   -+--+--+--+--+--+-
 5  |  |  |  |  |  |
   -+--+--+--+--+--+-

x = muted   o = open   digits in grid = fingers (1 index, 2 middle, 3 ring, 4 pinky)
EADGBE

Frets run top to bottom from the nut, and string 1 — the highest-pitched string — is the rightmost column, matching standard chord-box convention and the charts on the site.

Tools

Each result leads with a direct PNG URL for the chart, then the same chart as a fenced text grid. The URL is the picture in the form that survives every surface: it renders where markdown images work, stays clickable where they don't, and can be dropped into an artifact, an HTML page, or a saved file. The text grid is the fallback for anywhere neither is true.

Inline PNG bytes are opt-in via format: "image" or format: "both". They cost image tokens and several clients bury them in a collapsed tool drawer, so they're not worth sending by default now that a URL does the job. format defaults to "text", which still includes the image URL. Attribution is kept in every mode.

Every tool also takes a context argument describing why it's being called. That's injected by PostHog's MCP SDK and populates agent intent in analytics; nothing in the response depends on it.

How a chart reaches a person

There is no capability negotiation for "can you show an image", so the result carries several layers and lets the host use whichever it understands:

The widget is a ui://gpra-chord-charts/chart/{id} resource resolving to a self-contained HTML page with the chord already baked in — no JavaScript, no postMessage bridge, no client bundle. A host that ignores it simply shows no widget, and the text answer is untouched.

Measured on claude.ai, for anyone tempted to try these again: bare markdown images render as a click-through placeholder that opens a browser tab rather than loading inline; images wrapped in links collapse to the link; raw HTML is escaped to literal text; and the MCP Apps iframe is fetched but never mounted (ext-apps#671). On that surface the URL is the whole story, which is why it leads the text.

Results deliberately carry no structuredContent. A client that understands it may render it instead of the content blocks — one measurably did, reducing the answer to three JSON fields and dropping the chart, the attribution and the call to action. Nothing goes in a result that can displace the text.

What's in the library

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Guitar Practice Routine App — Chord Charts: common questions

Is Guitar Practice Routine App — Chord Charts MCP server safe?
Yes, by our scan: it is graded A (86/100). Read the Guitar Practice Routine App — Chord Charts safety report
How do I install Guitar Practice Routine App — Chord Charts?
It runs remotely at mcp.guitarpracticeroutine.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Guitar Practice Routine App — Chord Charts need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Guitar Practice Routine App — Chord Charts maintained?
The last commit was 25 days ago (2026-10-11). The latest release is v0.1.0.
Is Guitar Practice Routine App — Chord Charts up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Guitar Practice Routine App — Chord Charts compare with other MCP servers?
safety score 86/100 (higher than 72% of 48,243 servers); tools 4 (the typical server has 7); tools that change things 25% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.