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Arpeggio Advisor

Arpeggio Advisor is a skill for Claude Code, Codex from GuitarAlchemist/ga. It costs 24 tokens per session (541 once invoked), scanned A, original, MIT.

A guitar improvisation assistant that suggests arpeggios, musical scales, and target notes for each chord in a progression.

In plain words
What is it for?
Use it to plan guitar solos, choose notes over progressions such as ii–V–I, and understand the key and Roman-numeral role of each chord.
Why use it?
It turns a chord sequence into specific playing ideas, so you do not have to work out the music theory for every chord yourself.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 2repo yesterday A scan 24 tokens original MIT

Good fit Use it to plan guitar solos, choose notes over progressions such as ii–V–I, and understand the key and Roman-numeral role of each chord.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/guitaralchemist/ga/arpeggio-advisor
View source ↗ GuitarAlchemist/ga
Install

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.

Any agent
npx skills add GuitarAlchemist/ga --skill arpeggio-advisor
Clone the repo
git clone --depth 1 https://github.com/GuitarAlchemist/ga

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for Arpeggio Advisor

README.md
[![agentmods](https://agentmods.dev/badge/skills/guitaralchemist/ga/arpeggio-advisor/github.svg)](https://agentmods.dev/skills/guitaralchemist/ga/arpeggio-advisor)
Your own site
<a href="https://agentmods.dev/skills/guitaralchemist/ga/arpeggio-advisor"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/arpeggio-advisor/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.

agentmods 80×15 button for Arpeggio Advisor

Your own site · 80×15
<a href="https://agentmods.dev/skills/guitaralchemist/ga/arpeggio-advisor"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/arpeggio-advisor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 541 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00024 $0.00541
Opus 5.5 $0.00010 $0.00216
Sonnet 5.5 $0.00005 $0.00108
Haiku 4.5 $0.00002 $0.00054

Measured 1mo ago against content hash 0d6e665f9b79, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Arpeggio Advisor 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 1mo 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.

.agent/skills/arpeggio-advisor/SKILL.md · 50 lines

What it actually says

Arpeggio Advisor

You are an expert guitarist music theory assistant. When a user asks what to play, improvise, or solo over a chord progression, you provide a concrete per-chord arpeggio and mode breakdown.

Instructions

  1. Extract chord symbols from the user's message (e.g. "Am F C G", "ii-V-I in C", "Am7 Dm7 G7 Cmaj7").

  2. Call GaArpeggioSuggestions with the chord array and an optional key if the user specified one.

    • This returns per-chord arpeggio, mode, and target note data.

  3. Call GaAnalyzeProgression with the same chords to get the detected key and Roman numeral analysis.

  4. Format the response as a markdown table followed by a practical tip:

Progression in [key]:

| Chord | Roman | Arpeggio | Mode | Target Notes |
|-------|-------|----------|------|--------------|
| Am    | i     | Am7      | Aeolian | A C E G  |
| F     | bVI   | Fmaj7    | Lydian  | F A C E  |
| C     | bIII  | Cmaj7    | Ionian  | C E G B  |
| G     | bVII  | G7       | Mixolydian | G B D F |
  1. Add a 2-3 sentence guitarist tip — e.g. how to connect positions, which chord tones to target on strong beats, or how to create tension/release.

Response Rules

  • Use the exact chord symbols returned by the tools (not paraphrased).
  • If the key cannot be detected, show the most likely key and note it is inferred.
  • If a chord is ambiguous or chromatic, note it and still provide the best arpeggio match.
  • Keep the tip practical: fingering positions, target notes on beat 1, or common licks that work.
  • Do not add extra explanation beyond the table and tip unless the user asks a follow-up question.
Changes

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.

  1. 1mo ago First seen · 50 lines · 24 tokens per session scan A 0d6e665f9b79

Subscribe to this mod's changes

Arpeggio Advisor is a skill published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed yesterday), licensed MIT. It adds 24 tokens to every session and 541 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

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