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Agent skill

Score Music Composer

by autonomous-ai in autonomous-ai/openharness

Turns a musical brief into LilyPond concert-pitch music, checked parts for each instrument and a playable practice pack.

MITAuto-check passedMedia & Creative

Install Score Music Composer

skills CLI
$ npx skills add autonomous-ai/openharness --skill score -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install autonomous-ai/openharness score --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/autonomous-ai/openharness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/store/agents/score/skills/score .claude/skills/score && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
score
GitHub stars
1.1k
Token cost
~1.1k tokens
SKILL.md length
582 words
Files
11 (incl. scripts, references)
Skills in repo
100
Repo updated
First seen
Licence
MIT

At a glance

Turns a musical brief into LilyPond concert-pitch music, checked parts for each instrument and a playable practice pack.

  • Composing a short piece for a specific ensemble with set difficulty limits
  • SKILL.md covers Compose and revise, Hear and hand off and Boundaries
  • Runs JavaScript and Shell scripts from its folder; calls sh
  • Revising one part of an existing LilyPond score without disturbing the rest

What it does

The skill works inside the Score harness on trusted LilyPond projects. The agent first records the brief, assumptions, timing, instrument transpositions and difficulty limits in `ensemble.json`, then writes reusable concert-pitch variables in `score.ly`. The builder adds key, meter, tempo, the printed score, parts and MIDI proofs, so the source is never transposed a second time for a transposing instrument.

The agent runs `render-score.sh`, then inspects `.harness/score.json` and every printed PDF page, treating LilyPond warnings as errors to fix in the music or layout. A failed requirement is read from `.harness/failed-score.json`, and earlier versions are kept under `.harness/history/`. You listen in a `score.html` viewer with play and pause, seeking, player mute and solo, slowdown, bar loops and part selection, and the browser can save a WAV of up to 3 minutes. The delivery is `score-project.zip` with the full PDF and MIDI, individual parts and slower solo and minus-one MIDI.

When your agent uses it

  • Composing a short piece for a specific ensemble with set difficulty limits
  • Revising one part of an existing LilyPond score without disturbing the rest
  • Making practice tracks for players who need a slower or minus-one version

Example prompts

  • “Write a calm two-minute piece for violin, cello and piano and give me practice parts.”
  • “Make the clarinet line easier in the middle section of my score and show what changed in the other parts.”
  • “Arrange this melody for a beginner brass quartet and include a slower practice MIDI.”

Requirements

  • The Score harness with LilyPond available
  • A browser to open the `score.html` viewer

What it can do on your machine

Read from SKILL.md and the folder at commit 50da5db. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 9 files in scripts/ (JavaScript and Shell), which the agent can run.

    Shell commands in SKILL.md call:

    • sh

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Score Music Composer loads about 1.1k tokens when it runs, and up to ~2.5k if it reads all its reference files. Until then it costs about 52 tokens; SKILL.md has 582 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~52
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from autonomous-ai/openharness at commit 50da5db, republished under its MIT licence (© autonomous-ai). 582 words, ~1,115 tokens.

Download SKILL.mdSave it as .claude/skills/score/SKILL.md (or your agent's skills folder). This skill also uses 10 other files; get the full folder from GitHub.
name
score
description
Turn a musical brief into editable concert-pitch music, checked instrument parts and a listenable practice pack in the Score harness. Use for composing, arranging and revising trusted LilyPond projects.

From a musical idea to something the user can keep

The user does not need instruments or notation vocabulary. If they want to listen, start with mood, purpose, duration and a useful instrumentation; state assumptions and offer an audible first version. If they have real players, capture each player's instrument, written range and experience. Do not turn the starter trio or any particular difficulty limit into a universal requirement.

Read the ensemble contract before changing player setup, timing, difficulty or source exports.

Compose and revise

  • Save the actual brief, assumptions, timing, instrument transpositions and difficulty limits in ensemble.json. These are requirements, not values to infer from whatever the generated notes happen to contain.

  • Compose reusable concert-pitch variables in score.ly; the builder adds the initial key, meter, tempo, printed score, parts and MIDI proofs. Do not transpose the source again for a B-flat part or override staff transposition.

  • Give the music a deliberate shape: phrases, breathing space, contrast, accompaniment and an ending appropriate to the request. A successful compiler does not supply those decisions.

  • Run:

    sh
    sh "$SCORE_SKILLS/score/scripts/render-score.sh"

  • Inspect .harness/score.json and every printed PDF page, including individual parts. Check collisions, readability, instrument labels and sensible breaks. LilyPond warnings are errors. Correct the music or layout, not the warning policy.

  • On a failed requirement, read .harness/failed-score.json. Fix the music while retaining the user's limits. Change a requirement only when the request genuinely changes; explain a conflict instead of quietly widening a range.

  • For a targeted revision, verify the requested change and compare unaffected parts. Keep a useful previous version; generated handoffs are retained under .harness/history/.

Hear and hand off

Use score.html in the actual viewer. Exercise play/pause, seeking into a held note, player mute/solo, slowdown, bar loops and part selection. No instrument is needed. The browser can save a WAV of the current mix/loop (up to 3 minutes). Save/restore listening setup as JSON; no local storage is required.

The source-backed delivery is score-project.zip: full PDF/MIDI, individual parts, slower solo/minus-one MIDI, the saved brief, allowlisted sources and standalone rebuild tools. Test important downloads. Browser controls and WAV exports do not change score.ly or the prebuilt practice MIDIs. To change the composition, edit the sources and rebuild.

Report the version, checks and listening/visual review actually performed. Offer concrete revisions in the user's language (“make the ending warmer,” “remove the busy line”), not a requirement to learn notation first.

Show full SKILL.md (191 more words)Show less

Boundaries

Setup installs LilyPond 2.26.0 when needed on supported Macs/Linux x86-64; the builder finds that managed runtime automatically. Node 20+ comes from the runtime helper. LILYPOND_BIN overrides the binary. Only compile trusted input: LilyPond can execute Scheme and read local files. The source allowlist makes delivery explicit; it is not a Scheme sandbox. Do not add unrelated files, credentials or recordings to the portable project.

Ready means fresh engraving and the saved mechanical requirements passed, not proof of musical quality, comfort, breath control, fingering, physical playability or permission to use an arrangement. A synthesized sketch is not a recording or sampled performance. No real-player testing is implied.

This checked workflow supports constant meter/tempo, complete bars and pitched staves. See the contract for limits and excluded cases. Original native MIDI is retained; practice exports and browser audio ignore pedal, bends and other expressive controllers. The browser uses simple oscillators, not a sound library.

Legacy score.ly projects containing full layout/MIDI blocks still engrave without an ensemble contract, but remain unready for checked delivery. Preserve their source and extract music variables deliberately when upgrading. Do not blindly replace a user's composition with the template.

© autonomous-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 10 other files (scripts, references) in store/agents/score/skills/score of autonomous-ai/openharness.

  • SKILL.md
  • references/ensemble.md
  • scripts/LICENSE
  • scripts/archive.mjs
  • scripts/build.mjs
  • scripts/ensemble.mjs
  • scripts/lilypond.mjs
  • scripts/midi.mjs
  • scripts/preview.html
  • scripts/preview.js
  • scripts/render-score.sh

Open the folder on GitHubat commit 50da5db

Compare with similar skills

Score Music Composer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Score Music Composer compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Score Music Composer this skillautonomous-ai/openharness1.1k—~1.1kAutomated safety check: PassMIT
AudioCraft Audio GenerationOrchestra-Research/AI-Research-SKILLs13k9 repos~3.9kAutomated safety check: PassMIT
HyperFrames Media Useheygen-com/hyperframes59k—~2.4kAutomated safety check: PassApache-2.0
Musictadaspetra/loop2963 repos~827Automated safety check: PassMIT
VRGDG H3 Short Film Pipelinevrgamegirl19/comfyui-vrgamedevgirl760—~4.2kAutomated safety check: PassCustom licence
Mureka Music MakerSkyworkAI/Skywork-Skills2031 repos~3kAutomated safety check: PassMIT

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Categories

Questions about Score Music Composer

What does Score Music Composer do?

Turns a musical brief into LilyPond concert-pitch music, checked parts for each instrument and a playable practice pack. The skill works inside the Score harness on trusted LilyPond projects.ly`.

When should I use Score Music Composer?

Score Music Composer fits situations like: composing a short piece for a specific ensemble with set difficulty limits; revising one part of an existing LilyPond score without disturbing the rest; making practice tracks for players who need a slower or minus-one version.

How do I install Score Music Composer in Claude Code?

Run `npx skills add autonomous-ai/openharness --skill score -a claude-code`. Or copy the skill folder (store/agents/score/skills/score in autonomous-ai/openharness) into .claude/skills/score in your project. Claude Code loads it when a task matches its description.

How do I install Score Music Composer in Codex?

Run `npx skills add autonomous-ai/openharness --skill score -a codex`. Or copy the skill folder (store/agents/score/skills/score in autonomous-ai/openharness) into .agents/skills/score in your project. Codex loads it when a task matches its description.

Can I use Score Music Composer in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add autonomous-ai/openharness --skill score -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/score, .gemini/skills/score, .github/skills/score and .opencode/skills/score in your project.

What does Score Music Composer need to run?

Going by SKILL.md and its folder, Score Music Composer needs JavaScript and a shell for the scripts in its folder and the command-line tools its instructions call (sh). Our summary lists: The Score harness with LilyPond available; A browser to open the `score.html` viewer.

Does Score Music Composer access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Score Music Composer safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Score Music Composer use?

Score Music Composer is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Score Music Composer use?

About 1.1k tokens (SKILL.md is roughly 4.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.4k tokens, read only when the agent opens those files.

What are the alternatives to Score Music Composer?

Skills that share tags, products or a category with Score Music Composer: AudioCraft Audio Generation (Orchestra-Research/AI-Research-SKILLs, 13k stars), HyperFrames Media Use (heygen-com/hyperframes, 59k stars), Music (tadaspetra/loop, 296 stars) and VRGDG H3 Short Film Pipeline (vrgamegirl19/comfyui-vrgamedevgirl, 760 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Score Music Composer?

autonomous-ai (a GitHub organization) maintains it in autonomous-ai/openharness, which has 1,149 GitHub stars. The repository holds 100 skills in this directory. The repository was last updated on October 8, 2026.

Source: autonomous-ai/openharness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.