Fretwork Guitar Tools
com.guitarfretwork/fretworkguitarfretwork.comstreamable-httpv1.0.1Scanned
Guitar chords from frets, chord shapes, transposing, capo, scales, song keys and practice plans.
9 tools: 4 change things and 5 only read.
- Reads private data · 2
- Reads text others write · 0
- Can send data out · 0
- 1 finding
Anlyon alternative
4 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
9 tools
Changes things 4Claude Code: ask
guitar_level_checkA quick self-assessment that places a guitarist on Fretwork's 10-stage learning path (Stage 0 Getting Started to Stage 9 Artistry) from yes/no answers to up to nine questions about…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it A quick self-assessment that places a guitarist on Fretwork's 10-stage learning path (Stage 0 Getting Started to Stage 9 Artistry) from yes/no answers to up to nine questions about what they can already play, and says what to learn next. The questions build on each other, so answers are read in order up to the first "no". Called with no answers, it returns the nine questions.
Annotations the server declares
- title: Check a guitarist's level
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
identify_chordNames the chord a guitarist is holding from the fret on each string (standard tuning), lists its notes and returns a chord diagram.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it Names the chord a guitarist is holding from the fret on each string (standard tuning), lists its notes and returns a chord diagram. Use when someone asks "what chord is this?" and gives frets like x32010, 3-2-0-0-0-3 or "0 2 2 1 0 0" (low E string first; x = muted string).
Annotations the server declares
- title: Identify a guitar chord
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
make_practice_planBuilds a daily guitar practice routine and a 4-week focus plan sized to the player's level, the minutes they have each day and their goal (songs, strumming, fingerpicking, lead, ba…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it Builds a daily guitar practice routine and a 4-week focus plan sized to the player's level, the minutes they have each day and their goal (songs, strumming, fingerpicking, lead, barre chords, theory or general). Uses Fretwork's 10-stage curriculum, where stage 0 is for someone who has never played.
Annotations the server declares
- title: Make a guitar practice plan
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
transpose_chordsMoves a song's chords to a new key.1 finding
Why it is in this group
- The description's first verb is "move": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
The server marks "transpose_chords" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "move": a word for a change.
Description, as the server wrote it Moves a song's chords to a new key. Accepts a chord list, a chord chart with lyrics (chord lines are transposed, lyric lines are kept), or inline [C] chords. Give either from_key and to_key, or a number of semitones. Also suggests capo positions that let the guitarist keep easy open shapes in the new key.
Annotations the server declares
- title: Transpose guitar chords to a new key
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
Only reads 5Show 5 read-only tools
find_capoWorks out where to put a capo.No findings
Why it is in this group
- The name "find_capo" says "find": a word for reading.
Description, as the server wrote it Works out where to put a capo. Give the key you want to sound in (for example to match a singer or a recording) and, optionally, the open-chord key you want to play shapes in. Returns the capo fret, or the easy options if no shape key is given.
Annotations the server declares
- title: Find the capo position for a key
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
find_keyWorks out the most likely key of a song from its chord progression, gives each chord its Roman numeral, lists the other chords that belong to the key, and suggests which scale to s…No findings
Why it is in this group
- The name "find_key" says "find": a word for reading.
Description, as the server wrote it Works out the most likely key of a song from its chord progression, gives each chord its Roman numeral, lists the other chords that belong to the key, and suggests which scale to solo with.
Annotations the server declares
- title: Find the key of a song from its chords
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
find_songsFinds songs a guitarist can play with the chords they already know, from Fretwork's free library of 87 public-domain folk, gospel, blues, campfire and Christmas songs.No findings
Why it is in this group
- The name "find_songs" says "find": a word for reading.
Description, as the server wrote it Finds songs a guitarist can play with the chords they already know, from Fretwork's free library of 87 public-domain folk, gospel, blues, campfire and Christmas songs. Each song has chords, key, time signature, level and a free play-along page. Can also list songs that need just one or two new chords.
Annotations the server declares
- title: Find songs to play with the chords you know
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_chord_shapesReturns playable guitar shapes for a chord name (open position and movable barre shapes), with frets, fingering where known, the notes in the chord and a text chord diagram.Reads private dataNo findings
Why it is in this group
- The name "get_chord_shapes" says "get": a word for reading.
What it can reach
- private-dataThe description's first sentence says "return" and "note": it reads notes.
Description, as the server wrote it Returns playable guitar shapes for a chord name (open position and movable barre shapes), with frets, fingering where known, the notes in the chord and a text chord diagram. Handles major, minor, 7, maj7, m7, sus2, sus4, add9, 6, m6, 9, dim, m7b5, dim7, aug, power chords and slash chords such as G/B.
Annotations the server declares
- title: Show how to play a guitar chord
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_scaleGives the notes of a scale in any key and where they fall on the guitar fretboard (standard tuning), string by string, with root notes marked.Reads private dataNo findings
Why it is in this group
- The name "get_scale" says "get": a word for reading.
What it can reach
- private-dataThe description's first sentence says "note": it reads notes.
Description, as the server wrote it Gives the notes of a scale in any key and where they fall on the guitar fretboard (standard tuning), string by string, with root notes marked. Scales: major, natural minor, harmonic minor, melodic minor, the seven modes (dorian, phrygian, lydian, mixolydian, locrian), minor pentatonic, major pentatonic, blues and major blues.
Annotations the server declares
- title: Show a guitar scale on the fretboard
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged untrusted-input or outbound.
- Reads private data2
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write0
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
- Warntranspose_chords
The server marks "transpose_chords" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "move": a word for a change.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.1. Values in angle brackets are yours to fill in.
claude mcp add --transport http fretwork https://mcp.guitarfretwork.com/mcpclaude mcp add --transport http fretwork https://mcp.guitarfretwork.com/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__fretwork__get_chord_shapes",
"mcp__fretwork__find_capo",
"mcp__fretwork__get_scale",
"mcp__fretwork__find_key",
"mcp__fretwork__find_songs"
],
"ask": [
"mcp__fretwork__identify_chord",
"mcp__fretwork__transpose_chords",
"mcp__fretwork__guitar_level_check",
"mcp__fretwork__make_practice_plan"
],
"deny": []
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as fretwork. Review it before you use it.
Capability tags behind 2 rules
- mcp__fretwork__get_chord_shapes private-data
- mcp__fretwork__get_scale private-data
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/com.guitarfretwork/fretwork/verify?hash=79deda6cb2d22ee9b2d51c27797723de256e74282da47705500c85bd95f1a7e7" | jq -e '.changed == false'Pinned hash 79deda6cb2d2, from Oct 29, 2026, 10:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/com.guitarfretwork/fretwork/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/com.guitarfretwork/fretwork)Source: MCP Registry. Synced Oct 29, 2026, 10:17 UTC.