Agent Skill — Create and maintain Agent Skills for Copilot CLI. Includes a bundled Copilot Customization Builder agent and markdown instructions.
Packaged with skillpm — the package manager for Agent Skills. Install once, and skillpm handles resolution, agent wiring, and config deployment automatically.
# Install with skillpm (recommended)
skillpm install copilot-skill-builder
# Or with npx (no global install needed)
npx skillpm install copilot-skill-builder- SKILL.md format reference — frontmatter fields, body structure, best practices
- Current frontmatter fields —
name,description,license,allowed-tools,user-invocable, anddisable-model-invocation - Skill locations — project, personal, and alternative directories
- Writing effective descriptions — good vs bad examples
- Including scripts and resources — relative path references
- Skills vs custom instructions — when to use which
- Template — ready-to-use
skill-template.mdstarting point
On skillpm install, the following config files are automatically deployed to your workspace:
| Source | Deployed to |
|---|---|
customization-builder.agent.md |
.github/agents/copilot-customization-builder.agent.md |
markdown.instructions.md |
.github/instructions/copilot-markdown.instructions.md |
The Copilot Customization Builder agent helps create and maintain agents, instructions, skills, hooks, plugins, and MCP configurations — CLI-first, and VS Code-friendly where formats overlap.
On skillpm uninstall, deployed configs are cleaned up automatically via the
skillpm manifest.
Copilot loads this skill when you want to create a new skill, ask about the SKILL.md format, or need best practices for writing skills.
This skill is from the github-copilot-cli blueprint repository. See also:
copilot-cli-guide— CLI commands & shortcuts referencecopilot-setup-audit— Audit your Copilot setup
Why skillpm? The Agent Skills spec defines what a skill is — but not how to publish, install, or share them. skillpm fills that gap by mapping Agent Skills onto npm's ecosystem: same registry, same versioning, same dependency management. Small skills that compose, not monoliths that overlap.
MIT