Atlas entry

`mcp.guitarfretwork.com`

9 capabilities over MCP. First atlas observation.

Observed 3 Nov 2026, 16:02 UTC · passive: no tools called, no credentials sent · sha256:83183d…6a66

Capability facts

As observed from outside, at the time below

Observed: 3 Nov 2026, 16:02 UTC
Signed: 3 Nov 2026, 18:08 UTC

Protocols: MCP
Tools: 9
Declared sign-in: None declared

Effects counted AI readings, beta

Moves money: 0
Deletes or cancels records: 0
Sends messages to people: 0
Changes permissions: 0
Runs code: 0
Asks a person: 0

9 tools examined; 0 counted above a measured threshold.

Declared vs read disagreements

Declared read-only, read as writing: 0
Declared destructive, read as not writing: 0
Declared non-destructive, read as deleting: 0
Declared closed-world, read as reaching out: 0

Change since previous: First observation
Label status: Current

Surfaces

5 protocols checked

ARD	Not found	No document retrieved
A2A	Not found	0 skills
MCP	Valid	2025-11-25 · 9 tools · resources not advertised · prompts not advertised
OpenAPI	Not detected	0 operations
WebMCP	Not detected	0 declarative form tools · experimental

Exact states and meaning

ARD
absent
Exact state: not found · No document retrieved
The supported discovery location returned no matching document.
Not found does not prove the service exposes no such interface elsewhere.
Not observed / not fetched
A2A
absent
Exact state: not found · 0 skills
The supported discovery location returned no matching document.
Not found does not prove the service exposes no such interface elsewhere.
Not observed / not fetched
MCP
observed
Exact state: valid · Revision 2025-11-25 · 9 tools · resources not advertised · prompts not advertised
A usable protocol document was retrieved and validated.
Directly observed
OpenAPI
absent
Exact state: not detected · 0 operations
No endpoint was established from the evidence and scope that InterfaceDelta inspected.
Not detected does not prove that no endpoint exists.
Not observed / not fetched
WebMCP
absent
Exact state: not detected · 0 declarative form tools · experimental
No named declarative WebMCP form tools were observed in the origin root HTML.
Script-registered tools and other pages are not observed, so this does not mean the site has no WebMCP tools.
Not observed / not fetched

Capabilities

9 · inventory complete

Summary of the AI readings · beta

The service lists 9 capabilities, and 8 have AI readings.

find_songs is read as read-only.

Rows named: find_songs

Written by code from the AI readings on this page: it groups them and says nothing they do not.

The atlas shows each capability by its plain identifier, inputs and declared sign-in. Publisher descriptions, paths, links and source evidence are not published here.

MCP tools 9

find_capo
inputs shape_key, sounding_key (required)
AI Computes only, changes nothing 0.90
find_key
inputs chords (required)
AI Computes only, changes nothing 0.88
find_songs
inputs chords_known (required), level, max_new_chords, time_signature
AI Reads only 0.92
get_chord_shapes
inputs chord (required)
get_scale
inputs from_fret, root (required), scale (required), to_fret
AI Computes only, changes nothing 0.82
guitar_level_check
inputs barre_chords_and_16th_groove, bends_vibrato_full_solo, change_chords_in_time, four_chord_song_with_pattern and 5 more
AI Computes only, changes nothing 0.84
identify_chord
inputs frets (required)
AI Computes only, changes nothing 0.82
make_practice_plan
inputs days_per_week, goal, minutes_per_day, stage
AI Computes only, changes nothing 0.82
transpose_chords
inputs from_key, semitones, spelling, text (required) and 1 more
AI Computes only, changes nothing 0.90

Not observed in this Passport: A2A skills, MCP resources, MCP prompts, OpenAPI operations.

Declared and observed

9 tools declare hints; the AI readings agree with all 8 that have a reading.

A disagreement is not a finding about the service: either side can be wrong. How we compare declarations and readings.

Atlas history

1 observation

3 Nov 2026, 16:02 UTC9 capabilities · MCP 2025-11-25 · MCP endpoint validFirst observation
Fingerprint and versions
Fingerprint
83183df16e93cafe2b4485788e247d30ef2fd47a1622aa47840f1a72a8056a66
Passport schema
0.5.0, passport-semantic-v4
Consistency
MCP_PROMPTS_ADVERTISEMENT_LIST: not applicable · MCP_RESOURCES_ADVERTISEMENT_LIST: not applicable · MCP_TOOLS_ADVERTISEMENT_LIST: match · OPENAPI_MCP_EXPLICIT_MAPPING: not applicable

Each class compares an observation with the previous atlas observation. Runs of unchanged observations are grouped. Struck values are what the previous observation recorded; inserted values are what this one recorded.

About this entry

com.guitarfretwork/fretwork
Listed
Official MCP Registry · first listed 3 Nov 2026 · last listed 3 Nov 2026

Passive observations of a public interface listed in the Official MCP Registry. An observation does not verify security, ownership or compliance, and InterfaceDelta assigns no scores or rankings. Methodology · Report an inaccuracy · Ask for removal

Identity and snapshot

Target key: sha256:50447b219b709b799545979aa95958f69d0a15aa085b0651c6d55e67398684a0
Locator SHA-256: fed0541d362c8c8f5dc66b08dba504fda2b94a710d72627ffffb094c7158f029
Snapshot generated: 4 Nov 2026, 00:59 UTC

The entry is one exact observed target, not a real-world service identity, and implies no ownership. Endpoint paths are not published; the locator hash lets an operator confirm their own URL.