Guitar Practice Routine App — Chord Charts MCP server
Look up a guitar chord by name and get a text chord diagram. 12,708 standard-tuning names.
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Guitar Practice Routine App — Chord Charts tools (3)
write = sends, deletes, buys or postsget_chord_chart_by_idFreeFetch 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_nameFreeLook 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_dayFreeReturn 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.
Public scan report
scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it
- Code scan15 source files scanned25/25
- Live reliabilityremote reachable in 836ms20/20
- Tool poisoning3 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenancelast push 0 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
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)
EADGBEFrets 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.
Install directly
claude mcp add --transport http gpra-chord-charts https://mcp.guitarpracticeroutine.com/mcp
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 (93/100). 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, Claude Desktop or Cursor 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 in the last day (2026-09-20). The latest release is v0.1.0.
- Is Guitar Practice Routine App — Chord Charts up?
- 100% of our last 7 checks got an answer. We check remote servers about four times a day.
- What can I use instead of Guitar Practice Routine App — Chord Charts?
- Servers from other publishers that do the same job: Microcharts MCP server.
Alternatives to Guitar Practice Routine App — Chord Charts
Same job from other publishers: the closest match first, then the best rated.
- MicrochartsFind, wire, and render microcharts — word-sized React charts with generated alt text.not reviewedEstablishedA