| name | skill-builder |
| description | Build-focused skill for creating, updating, and installing standard Agent Skills. |
| type | system |
| created_by | system |
| kind | system |
| allowed-tools | ["create_new_skill","update_skill","install_agent_skill"] |
Skill Builder
This skill is dedicated to skill engineering tasks only.
When to Use
- Create a new skill from scratch.
- Update an existing skill's code or documentation.
- Install a standard Agent Skill package into the user AI skill directory.
- Prepare a skill so it can later be exported or shared as a portable ZIP package from Skill Center.
Responsibilities
- Create Skills: generate
SKILL.md and skill.json, plus impl.py only when the user explicitly wants new lightweight tools.
- Update Skills: patch existing AI-generated or built-in skills.
- Install Agent Skills: copy a standard Agent Skill package as-is, preserve its original
SKILL.md, and add Cowork indexing metadata.
- Keep Packages Portable: keep reusable references, scripts, and assets inside the skill directory so Skill Center ZIP export can move the complete package.
Tools
create_new_skill
Creates or updates an AI-generated skill in ai_skills.
update_skill
Updates an existing skill with optional scope resolution:
target_scope="ai_only": only modify skill in ai_skillstarget_scope="builtin_only": only modify skill in built-in skillstarget_scope="auto": prefer AI-generated one, fallback to built-in
install_agent_skill
Installs a standard Agent Skill package into user ai_skills. The source can be a skill directory, ZIP package, or single Markdown SKILL.md file.
Current Runtime Notes
- Skill creation remains knowledge-first: prefer clear experience, boundaries, and tool refs before adding code.
- Agent Skill installation preserves the upstream
SKILL.md; skill.json is generated only as Cowork indexing and workbench metadata.
- The UI-level Skill Center handles ZIP export/import. This skill prepares good package contents; it does not itself write ZIP files.
- Avoid writing cache, build output, or environment folders into skill directories because export intentionally skips those directories.
