What is fractal?
fractal is a Claude skill by plasma-ai that bounded hierarchical agent loops in isolated git worktrees. It is listed under Engineering practice and has 783 GitHub stars.
| Type | Claude skill |
|---|---|
| Author | plasma-ai |
| Repository | plasma-ai/fractal |
| Popularity | 783 GitHub stars |
| Category | Engineering practice |
| Security | Low risk (92/100) |
| Rank | #711 of 1,262 Claude skills; #101 in Engineering practice |
| SKILL.md length | 674 lines |
| License | Apache-2.0 |
| Last commit | 2026-10-18 |
| Stars this week | +1 |
Is fractal safe to install?
fractal scores 92/100 on the MCPMods security check: Low risk. No checks raised a concern. It passed 7 of 9 checks.
Skill results come from a static scan of its SKILL.md for instruction overrides, hidden actions, risky commands and credential access.
| Check | Result |
|---|---|
| No instruction-override phrases | Pass |
| No hidden actions | Pass |
| No pipe-to-shell installers | Pass |
| No obfuscated code | Pass |
| No destructive commands | Pass |
| Reads keys or credentials | Note |
| No network requests | Pass |
| Runs shell commands | Note |
| Installs no packages | Pass |
What the scan matched
- credentials:
OPENROUTER_API_KEY - shell:
```bash - scripts:
scripts/setup.sh
How do I install fractal?
- Install with the skills CLI. Works for Claude Code and other agents that read skills.
npx skills add https://github.com/plasma-ai/fractal --skill fractal
- Or copy it by hand. Claude Code loads any folder with a SKILL.md from ~/.claude/skills.
git clone https://github.com/plasma-ai/fractal cp -r fractal/fractal/skills/fractal ~/.claude/skills/fractal
- Use it. Claude loads the skill when a task matches its description. You can also name it in your prompt.
Use the fractal skill to …
Or ask Claude to set it up
Paste this into Claude Code and it installs fractal for you:
Install the "fractal" skill from https://github.com/plasma-ai/fractal/tree/main/fractal/skills/fractal into ~/.claude/skills, then tell me in one line what it does.