agentconfig.org

A reference guide for configuring AI coding assistants. Learn where config files go, what primitives each tool supports, and how to structure your projects for maximum AI effectiveness.

Live site:agentconfig.org

What's Here

• AI Primitives — The 11 core configuration primitives (instructions, skills, agents, commands, etc.) that power AI coding assistants
• Interactive File Tree — Visual guide to where config files live, for both global (user home) and project-level configuration
• Provider Comparison — Side-by-side comparison of GitHub Copilot, Claude Code, Cursor, and OpenAI Codex support for each primitive

Key Paths

GitHub Copilot

Type	Path
Global skills	~/.copilot/skills/ or ~/.github/skills/
Project instructions	.github/copilot-instructions.md
Project skills	.github/skills/<skill-name>/SKILL.md
Project agents	.github/agents/<name>.agent.md

Claude Code

Type	Path
Global config	~/.claude/
Global memory	~/.claude/CLAUDE.md
Global commands	~/.claude/commands/<name>.md
Project memory	./CLAUDE.md or .claude/CLAUDE.md
Project settings	.claude/settings.json

Cursor

Type	Path
Global settings	~/.cursor/settings.json
Project instructions	.cursor/instructions.md
Project rules	.cursor/rules/<name>.md

OpenAI Codex

Type	Path
Global config	~/.codex/config.toml
Global instructions	~/.codex/AGENTS.md
Project instructions	AGENTS.md
Project skills	.codex/skills/<skill-name>/SKILL.md
Command rules	~/.codex/rules/*.rules

See the llms.txt for a machine-readable summary.

Development

bun install
bun run dev

Testing

bun run test

Build

bun run build

Tech Stack

• Preact + TypeScript
• Vite
• Tailwind CSS v4
• Playwright for E2E tests

Contributing

Contributions welcome! This project does not use GitHub Issues — if you notice anything incorrect or outdated, please open a pull request directly.

See CONTRIBUTING.md for details.

License

ISC