fusion-rules
Entrypoint for AI coding assistant rule authoring across GitHub Copilot, Cursor, and Claude Code. USE FOR: setting up rules, reviewing existing rules, scaffolding instruction files, or asking which editor format to use. DO NOT USE FOR: authoring skills (SKILL.md), agent definitions (.agent.md), or CI enforcement of rule files.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/equinor/fusion-skills --skill fusion-rules- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads fusion-rules automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Fusion Rules
Gateway for AI coding assistant rule authoring. Detects the target editor and routes to the right agent.
Routing
| Intent | Agent |
|---|---|
| Set up GitHub Copilot instructions / rules | agents/copilot.agent.md |
| Set up Cursor project rules | agents/cursor.agent.md |
| Set up Claude Code rules / CLAUDE.md | agents/claude-code.agent.md |
| Set up rules for all editors / mixed team | Run all three agents sequentially |
| Review or improve existing rules | Route to the agent matching the file format |
Intent detection
Detect target editor from the request:
- Copilot — "copilot", "copilot-instructions", ".github/instructions", "applyTo"
- Cursor — "cursor", ".cursor/rules", "mdc", "alwaysApply", "globs"
- Claude Code — "claude", "CLAUDE.md", ".claude/rules", "paths"
- All / unknown — "rules", "instructions", "set up AI rules", or no editor specified
Route directly on detected intent. No editor specified → run all three agents.
Loading behavior
Load ONLY the routed agent file. Each agent carries the full workflow and references .system/fusion-rule-author/ assets and templates on demand. Don't preload all agents.
Multi-editor workflow
When targeting multiple editors:
- Run first agent's scan and interview (Steps 1–3) in full
- Pass scan summary + interview answers as context to remaining agents — they skip Steps 1–3 and start at Step 4 (Classify)
- Each agent drafts, reviews, and writes files for its own editor format
- Generate parallel files with equivalent content — no duplication within a single editor
What this skill does NOT do
- Author skills (
SKILL.md) — usefusion-skill-authoring - Author agent definitions (
.agent.md) — separate concern - Write CI checks for rule validation — out of scope
- Migrate entire legacy codebases — incremental adoption only
Safety
- No secrets or credentials in rule files
- No overwrites without showing diff and getting approval
- No invented conventions — only document what the developer confirms
- Show drafts before writing any files
FAQ
What does the fusion-rules skill do?
Entrypoint for AI coding assistant rule authoring across GitHub Copilot, Cursor, and Claude Code. USE FOR: setting up rules, reviewing existing rules, scaffolding instruction files, or asking which editor format to use. DO NOT USE FOR: authoring skills (SKILL.md), agent definitions (.agent.md), or CI enforcement of rule files.
How do I install fusion-rules?
Run npx skills add https://github.com/equinor/fusion-skills --skill fusion-rules in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/fusion-rules/ (personal) or .claude/skills/fusion-rules/ (project).
Which AI agents can use fusion-rules?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is fusion-rules safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains fusion-rules?
It is published by equinor in equinor/fusion-skills. It has 1,066 recorded installs.
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