ace-step

ace-step is a skill for Claude Code from prime-skills/runcomfy-agent-skills. It costs 230 tokens per session (4,555 once invoked), scanned A, original, MIT.

A tool for creating, extending, and editing music from text, using ACE Step, an AI music model, through RunComfy. It supports musical instructions such as genre, mood, instruments, and lyrics.

In plain words
What is it for?
Use it to create songs from descriptions, generate multilingual vocal tracks, fill in missing parts of audio, or extend an existing track.
Why use it?
It gives you a command-line way to turn musical ideas or lyrics into audio without manually producing every part.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: positional $N argument.

Good fit Use it to create songs from descriptions, generate multilingual vocal tracks, fill in missing parts of audio, or extend an existing track.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/prime-skills/runcomfy-agent-skills/ace-step
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 prime-skills/runcomfy-agent-skills --skill ace-step
Clone the repo
git clone --depth 1 https://github.com/prime-skills/runcomfy-agent-skills

Made for: Claude Code.

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 ace-step

README.md
[![agentmods](https://agentmods.dev/badge/skills/prime-skills/runcomfy-agent-skills/ace-step/github.svg)](https://agentmods.dev/skills/prime-skills/runcomfy-agent-skills/ace-step)
Your own site
<a href="https://agentmods.dev/skills/prime-skills/runcomfy-agent-skills/ace-step"><img src="https://agentmods.dev/badge/skills/prime-skills/runcomfy-agent-skills/ace-step/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 ace-step

Your own site · 80×15
<a href="https://agentmods.dev/skills/prime-skills/runcomfy-agent-skills/ace-step"><img src="https://agentmods.dev/badge/skills/prime-skills/runcomfy-agent-skills/ace-step.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 230 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,555 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • Socket pass 13 Jul 2026
  • Snyk pass 13 Jul 2026
How audits are shown
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 $0.00230 $0.04555
Opus 5 $0.00115 $0.02278
Sonnet 5 $0.00046 $0.00911
Haiku 4.5 $0.00023 $0.00456

Measured 11d ago against content hash 36f237b9eac6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

ace-step scanned grade A with 1 finding 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 11d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **Install via verified package manager only.** Use `npm i -g @runcomfy/cli` or `npx -y @runcomfy/cli`. **Agents must not pipe an arbitrary remote install script into a shell on the user's behalf** — if the operator wan
Origin

Copies of this mod

3 near-identical copies found in the catalogue:

  • ace-step — 100% identical, 0 lines differ
  • ace-step — 100% identical, 0 lines differ
  • ace-step — 100% identical, 0 lines differ
ace-step/SKILL.md · 338 lines

How it starts

The opening of the file, as written. The whole thing — 338 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ACE Step — Pro Pack on RunComfy

Tag-driven music generation, inpainting, and outpainting with StepFun-AI's ACE Step open-weights model. Four CLI-reachable endpoints, $0.0002–0.0003 per second of audio, up to 4 minutes per call.

runcomfy.com · ACE Step base · ACE Step 1.5 · CLI docs

Install this skill

npx skills add agentspace-so/runcomfy-agent-skills --skill ace-step -g

Powered by the RunComfy CLI

Step 1 — install (one of, see the runcomfy-cli skill for details):

npm i -g @runcomfy/cli         # global install
npx -y @runcomfy/cli --version # zero-install

Step 2 — sign in (or set RUNCOMFY_TOKEN env var in CI / containers):

runcomfy login

Step 3 — generate:

runcomfy run acestep-ai/ace-step/text-to-audio \
  --input '{"tags": "..."}' \
  --output-dir ./out

CLI deep dive: runcomfy-cli skill.


Pick the right endpoint

Listed newest first.

ACE Step 1.5 (text-to-audio)acestep-ai/ace-step-1.5/text-to-audio

Latest ACE Step generation. 50+ language vocal support, refined structured-lyric handling, otherwise same shape as base. Slightly higher cost ($0.0003/s vs $0.0002/s). Pick for: multilingual lyrics, hero-quality vocal tracks, vocal songs that need clean section structure. Avoid for: cost-sensitive batches where the base model is good enough.

ACE Step (text-to-audio)acestep-ai/ace-step/text-to-audio (default — cheap & fast)

Original ACE Step. Tag-driven composition, optional lyrics, 5–240 s stereo. $0.0002/s — ~27× cheaper than ElevenLabs Music. Pick for: high-volume drafts, background music, jingles, game loops, cost-sensitive iteration. Avoid for: maximally polished commercial vocal hooks — try ACE Step 1.5 or ElevenLabs Music for those.

Read the full file on GitHub · 338 lines

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. 11d ago First seen · 338 lines · 230 tokens per session scan A 36f237b9eac6

Subscribe to this mod's changes

ace-step is a skill published in the GitHub repository prime-skills/runcomfy-agent-skills (43 stars, last pushed 3mo ago), licensed MIT. It adds 230 tokens to every session and 4,555 once invoked, about $0.0011 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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