PyTheory is a Python toolkit for exploring music theory and composing music, with immediate audio playback and visual representations such as guitar tabs and chord diagrams. Musicians and programmers use it to create arrangements across multiple musical systems, instruments, rhythms, and effects. The catalogue add-ons provide agent guidance for working with the project.
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.
git clone --depth 1 https://github.com/kennethreitz/pytheoryWrote 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/plugins/kennethreitz/pytheory/composing-with-pytheory)<a href="https://agentmods.dev/plugins/kennethreitz/pytheory/composing-with-pytheory"><img src="https://agentmods.dev/badge/plugins/kennethreitz/pytheory/composing-with-pytheory/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/plugins/kennethreitz/pytheory/composing-with-pytheory"><img src="https://agentmods.dev/badge/plugins/kennethreitz/pytheory/composing-with-pytheory.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
composing-with-pytheory 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- composing-with-pytheory — 100% identical, 0 lines differ
What it actually says
{
"name": "composing-with-pytheory",
"displayName": "Composing with PyTheory",
"description": "Compose music with PyTheory — progressions, melodies, drums, and full arrangements rendered to audio or MIDI from pure Python.",
"author": {
"name": "Kenneth Reitz",
"email": "[email protected]"
},
"homepage": "https://pytheory.org",
"repository": "https://github.com/kennethreitz/pytheory-skill",
"license": "MIT",
"keywords": ["music", "music-theory", "composition", "midi", "audio", "synthesis", "pytheory"]
}
What it installs
The manifest is a name and a version. 6 skills travel with it, and installing the plugin installs all of them — 787 tokens a session between them. Each is measured on its own page, and each can be installed alone.
- Skill composing-with-pytheory A 138 tokens
- Skill playing-guitar-with-pytheory A 165 tokens
- Skill chord-lab-with-pytheory A 114 tokens
- Skill keys-and-harmony-with-pytheory A 132 tokens
- Skill scales-modes-and-tunings-with-pytheory A 153 tokens
- Skill transcription-and-notation-with-pytheory A 85 tokens
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.
- 1mo ago First seen · 14 lines scan A 2507b58ea8c8
composing-with-pytheory is a plugin published in the GitHub repository kennethreitz/pytheory (1,657 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-30.
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