Ace Step

Four endpoints for generating and editing music with StepFun-AI's open-weights ACE Step model via RunComfy's CLI. The base model costs $0.0002 per second of audio (about 27× cheaper than ElevenLabs Music), good for drafts and high-volume work. ACE Step 1.5 adds 50+ language vocal support and better structured-lyric handling for an extra fifty percent. Text-to-audio takes comma-separated tags and optional section-marked lyrics, spits out 5 seconds to 4 minutes of stereo. Audio-inpaint regenerates a time range inside an existing track. Audio-outpaint extends before or after. The tag-driven approach means you write "lo-fi hip-hop, mellow, rhodes piano, 75 BPM" instead of hoping a prompt does the right thing. Most useful when you need cheap iteration or want to fix one section without re-rendering the whole song.

skills.sh installs: 108.9K
GitHub stars: 11
last updated: Jun 3, 2026

View on GitHub

Install

$ npx -y skills add agentspace-so/runcomfy-agent-skills --skill ace-step --agent claude-code

Installs into .claude/skills of the current project.

Files

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:

SKILL.md on GitHub

Details

Repository: github.com/agentspace-so/runcomfy-agent-skills
Categories: AI & Agent Building, Release Management
First seen: Jun 3, 2026