Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add GuitarAlchemist/ga --skill chord-infogit clone --depth 1 https://github.com/GuitarAlchemist/gaWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/guitaralchemist/ga/chord-info)<a href="https://agentmods.dev/skills/guitaralchemist/ga/chord-info"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/chord-info/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/guitaralchemist/ga/chord-info"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/chord-info.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00068 | $0.01525 |
| Opus 5 | $0.00034 | $0.00763 |
| Sonnet 5 | $0.00014 | $0.00305 |
| Haiku 4.5 | $0.00007 | $0.00153 |
Grade A, and why
chord-info scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Notes of a Chord
When a user asks for the notes / intervals / construction of a named chord, call the ga_chord_info MCP tool. Do NOT recall the notes from training knowledge — different sources spell the same chord differently (Bbm = Bb-Db-F vs Bb-C#-F) and the LLM will confidently produce wrong enharmonics for less-common keys.
Calling the tool
The tool takes one argument:
chordSymbol— string, e.g."C","Cm","Cmaj7","F#dim","Bbm7". Case-insensitive root letter; quality suffix uses the standard short forms below.
It returns a structured result:
Symbol— chord symbol echoed back.Root— root note in canonical case (e.g."F#").Quality— long form:"major","minor","diminished","augmented","dominant 7","major 7","minor 7","diminished 7","half-diminished".Notes— array of chord tones in ascending order.Intervals— interval names for each note (e.g.["root", "major third", "perfect fifth"]).Error— non-null only when the input could not be parsed.
Supported quality suffixes
| Symbol form | Quality returned |
|---|---|
C, Cmaj, CM |
"major" |
Cm, Cmin |
"minor" |
Cdim |
"diminished" |
Caug |
"augmented" |
C7, Cdom7 |
"dominant 7" |
Cmaj7, CM7 |
"major 7" |
Cm7, Cmin7 |
"minor 7" |
Cdim7 |
"diminished 7" |
Cm7b5, Cmin7b5 |
"half-diminished" |
Mapping user phrasings to arguments
- "What is a C major chord?" →
chordSymbol="C"(or"Cmaj"). - "What notes are in Dm7?" →
chordSymbol="Dm7". - "Spell a B7 chord" →
chordSymbol="B7". - "Notes in an F minor chord" →
chordSymbol="Fm". - "What's in a Cmaj7?" →
chordSymbol="Cmaj7". - "Spell a B half-diminished" →
chordSymbol="Bm7b5". - "What's a C diminished 7th?" →
chordSymbol="Cdim7".
Phrasing the answer
Use the Notes array verbatim, joined with – (en-dash) or commas. Mention the Quality and the Intervals for educational color. Example:
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 109 lines · 68 tokens per session scan A 87bb36aba555
chord-info is a skill published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed today), licensed MIT. It adds 68 tokens to every session and 1,525 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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