name: builtin-skills description: Use when creating a new builtin skill for Crush, editing an existing builtin skill (internal/skills/builtin/), or when the user needs to understand how the embedded skill system works.

Builtin Skills

Crush embeds skills directly into the binary via internal/skills/builtin/. These are always available without user configuration.

How It Works

• Each skill lives in internal/skills/builtin/<skill-name>/SKILL.md.
• The tree is embedded at compile time via //go:embed builtin/* in internal/skills/embed.go.
• DiscoverBuiltin() walks the embedded FS, parses each SKILL.md, and sets paths with the crush://skills/ prefix (e.g., crush://skills/jq/SKILL.md).
• The View tool resolves crush:// paths from the embedded FS, not disk.
• User skills with the same name override builtins (last occurrence wins in Deduplicate()).

Adding a New Builtin Skill

1. Create internal/skills/builtin/<skill-name>/SKILL.md with YAML frontmatter (name, description) and markdown instructions. The directory name must match the name field.
2. No extra wiring needed — //go:embed builtin/* picks up new directories automatically.
3. Add a test assertion in TestDiscoverBuiltin in internal/skills/skills_test.go to verify discovery.
4. Build and test: go build . && go test ./internal/skills/...

Existing Builtin Skills