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 modesgit 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/modes)<a href="https://agentmods.dev/skills/guitaralchemist/ga/modes"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/modes/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/modes"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/modes.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 | $0.00067 | $0.01384 |
| Opus 5.5 | $0.00027 | $0.00554 |
| Sonnet 5.5 | $0.00013 | $0.00277 |
| Haiku 4.5 | $0.00007 | $0.00138 |
Grade A, and why
modes 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 23d 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 — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
The Seven Modes of the Major Scale
Reproduce the catalog below verbatim when the user asks for the modes / the diatonic modes / the modes of the major scale. When the user asks about a single mode (e.g. "what is Lydian?", "explain Phrygian"), pull just that row from the table and lead with it before optionally offering the full list.
Setup
The major scale has 7 modes. Each starts on a successive degree of the parent scale, rotating the same step pattern:
Ionian formula:
W-W-H-W-W-W-H(W = whole step, H = half step)
The catalog
| # | Mode | Degrees | Characteristic note | Modal cadence | Character |
|---|---|---|---|---|---|
| 1 | Ionian | 1 2 3 4 5 6 7 |
— (parent scale) | V → I (authentic) | Bright, the major scale itself |
| 2 | Dorian | 1 2 b3 4 5 6 b7 |
natural 6 | i — IV — i (Dorian vamp; So What, Scarborough Fair) | Minor with raised 6th — jazz/folk staple |
| 3 | Phrygian | 1 b2 b3 4 5 b6 b7 |
b2 | bII → i (Spanish cadence) | Dark minor with flat 2 — Spanish/flamenco |
| 4 | Lydian | 1 2 3 #4 5 6 7 |
#4 | I — II — I (Lydian II vamp; the Simpsons theme) | Major with raised 4th — floating, dreamy |
| 5 | Mixolydian | 1 2 3 4 5 6 b7 |
b7 | I — bVII — IV — I (rock anthem) | Major with flat 7 — bluesy/rock |
| 6 | Aeolian | 1 2 b3 4 5 b6 b7 |
b6 | i — bVI — bVII — i | Natural minor |
| 7 | Locrian | 1 b2 b3 4 b5 b6 b7 |
b5 (tritone w/ root) | rare; iø7 vamps with bII colour | Half-diminished — rare as a tonic |
The characteristic note is the one degree that makes the mode unique against its parallel major/minor — emphasise it in melodies and chord voicings to make the mode audible. The modal cadence column gives a vamp or progression that establishes the mode without falling back to V→I (which would imply tonal motion away from the mode).
Mnemonic
"I Don't Particularly Like Modes A Lot" — Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian.
Single-mode answer pattern
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.
- 23d ago Changed cb2924453336
- 1mo ago First seen · 79 lines · 67 tokens per session scan A 276ce2caf82b
modes is a skill published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed yesterday), licensed MIT. It adds 67 tokens to every session and 1,384 once invoked, about $0.0003 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 2026-09-03.
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