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Fretwork Guitar Tools

REMOTE · MCP.GUITARFRETWORK.COM

Guitar chords from frets, chord shapes, transposing, capo, scales, song keys and practice plans.

+3 this week 68 Trust /100

Last scanned (11 hours ago)

Scores higher than 53% of remote servers

Reachable. Last reached 5 Nov 2026.

Category Entertainment and Games

Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →

Endpoint Security63
Transport & Reachability100
Schema Quality & AI Usability67
  • AI-judged instruction clarity (excellent).Pass
  • Context-footprint check failed: tool/resource definitions use about 1739 tokens (~193/item across 9 items; 9 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
  • Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
Tool Safety100
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • We read all 9 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
  • An AI judge read all 10 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 3 Nov 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

  • 1 Nov 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

  • 30 Oct 26 +1
    • Stability: unverified → 0.03 ▲ functional
  • 29 Oct 26 65

    First indexed and scored.

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 5 Nov 2026 · Probed https://mcp.guitarfretwork.com/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=guitarfretwork.com CN=WE1,O=Google Trust Services,C=US 29 Oct 2026 27 Jan 2027 ECDSA 256 ECDSA-SHA256 301ee3614cfa9f1c1386d26a38765eef
SANs: guitarfretwork.com, mcp.guitarfretwork.com, *.mcp.guitarfretwork.com
CN=WE1,O=Google Trust Services,C=US (CA) CN=GTS Root R4,O=Google Trust Services LLC,C=US 13 Dec 2023 20 Feb 2029 ECDSA 256 ECDSA-SHA384 7ff31977972c224a76155d13b6d685e3
CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE 15 Nov 2023 28 Jan 2028 ECDSA 384 SHA256-RSA 7fe530bf331343bedd821610493d8a1b

Background: What to check on a remote MCP endpoint →

DNSSEC insecure

Validation of mcp.guitarfretwork.com. — Not signed

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
com. present 19718 13 Verified
guitarfretwork.com. absent Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://mcp.guitarfretwork.com/mcp Verified 200
http (plaintext) http://mcp.guitarfretwork.com/mcp Inconclusive 405
MCP tools · 9 exposed · ~1,594 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
find_capo ~124

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.

NameTypeReqDescription
shape_keystring–Optional. The key whose open chord shapes you want to play, e.g. "G" or "Em".
sounding_keystringyesThe key the music should sound in, e.g. "Bb", "F# minor".

No output schema declared.

No examples provided.

find_key ~74

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.

NameTypeReqDescription
chordsstringyesThe chords in order, e.g. "G D Em C" or "Am F C G".

No output schema declared.

No examples provided.

find_songs ~154

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.

NameTypeReqDescription
chords_knownstringyesChords the player can already play, e.g. "G C D Em".
levelstring–Filter by level (default any).
max_new_chordsinteger–Also include songs needing up to this many extra chords (default 0).
time_signaturestring–Filter by time signature (default any).

No output schema declared.

No examples provided.

get_chord_shapes ~141

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.

NameTypeReqDescription
chordstringyesChord name, for example "F", "Bm", "F#m7", "Cadd9", "Bbmaj7", "G/B", "E5".

No output schema declared.

No examples provided.

get_scale ~175

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.

NameTypeReqDescription
from_fretinteger–Lowest fret to show (default 0).
rootstringyesKey note, e.g. "A", "F#", "Bb".
scalestringyesScale type, e.g. "minor pentatonic", "major", "blues", "dorian".
to_fretinteger–Highest fret to show (default 12).

No output schema declared.

No examples provided.

guitar_level_check ~360

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.

NameTypeReqDescription
barre_chords_and_16th_grooveboolean–Can you play any major or minor barre chord and hold a 16th-note strumming groove?
bends_vibrato_full_soloboolean–Can you play a solo with in-tune bends, vibrato and clear phrases?
change_chords_in_timeboolean–Can you change between basic open chords (like G, C, D, Em) in time and play a whole simple song?
four_chord_song_with_patternboolean–Can you play a four-chord song start to finish with a strumming pattern?
keys_and_pentatonic_anywhereboolean–Can you name the chords in any key and solo with the pentatonic scale anywhere on the neck?
play_the_changesboolean–Can you solo over a progression and target the chord tones as the chords change?
riff_blues_and_short_soloboolean–Can you play a riff, a 12-bar blues and a short solo of your own?
transcribe_and_tensionboolean–Can you transcribe a full solo and improvise with tension and release?
tune_and_clean_notesboolean–Can you tune the guitar and play a clean note on every string?

No output schema declared.

No examples provided.

identify_chord ~157

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).

NameTypeReqDescription
fretsstringyesSix frets from the low E string to the high e string. Use x for a muted string, 0 for open. Examples: "x32010", "3 2 0 0 0 3", "8-10-10-9-8-8".

No output schema declared.

No examples provided.

make_practice_plan ~192

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.

NameTypeReqDescription
days_per_weekinteger–Practice days per week (default 5).
goalstring–Main goal (default general).
minutes_per_dayinteger–Practice minutes per day (default 20).
stageinteger–Fretwork stage 0–9 (0 = never played, 1 = first chords, 2 = rhythm & songs, 3 = riffs & first solos, 4 = barre chords, 5 = scales & keys, 6 = lead guitar, 7–9 = advanced).

No output schema declared.

No examples provided.

transpose_chords ~217

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.

NameTypeReqDescription
from_keystring–Current key, e.g. "G" or "A minor". Optional if semitones is given; if missing, the first chord is used.
semitonesinteger–Semitones to move (+ up, - down). Used when to_key is not given.
spellingstring–Accidentals for the result. auto follows the target key.
textstringyesThe chords or chord chart, e.g. "G D Em C" or a chart with chord lines above lyrics.
to_keystring–Target key, e.g. "Bb" or "C minor".

No output schema declared.

No examples provided.

Install

How do I install the Fretwork Guitar Tools MCP server?

Fretwork Guitar Tools is a hosted endpoint at https://mcp.guitarfretwork.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

remote · mcp.guitarfretwork.com

# add to Claude Code
claude mcp add --transport http com-guitarfretwork-fretwork 'https://mcp.guitarfretwork.com/mcp'
Common questions

What is the Fretwork Guitar Tools MCP server?

Fretwork Guitar Tools is an MCP server listed in the public MCP registry as com.guitarfretwork/fretwork. Guitar chords from frets, chord shapes, transposing, capo, scales, song keys and practice plans. This page covers its hosted endpoint (https://mcp.guitarfretwork.com/mcp).

Is the Fretwork Guitar Tools MCP server safe to use?

Fretwork Guitar Tools scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the Fretwork Guitar Tools MCP server expose?

Fretwork Guitar Tools exposes 9 tools: identify_chord, get_chord_shapes, transpose_chords, find_capo, get_scale, and 4 more. Their descriptions and schemas cost roughly 1,594 tokens of context every time the server is loaded.

Does the Fretwork Guitar Tools MCP server require authentication?

No. We connected to Fretwork Guitar Tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the Fretwork Guitar Tools MCP server still maintained?

Fretwork Guitar Tools is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.