skill-creator
Create new skills following the GBrain conformance standard. Generates SKILL.md with frontmatter, Contract, Phases, Output Format, and Anti-Patterns. Checks MECE against existing skills. Updates manifest and resolver.
- Installs
- 234
- Last 24h
- +8
- Trending rank
- #9606
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/garrytan/gbrain --skill skill-creator- 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 skill-creator 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.
Skill Creator
Contract
This skill guarantees:
- New skill follows conformance standard (frontmatter + required sections)
- MECE check: no overlap with existing skills' triggers
- Manifest.json updated
- RESOLVER.md updated with routing entry
- Skill passes conformance tests (
bun test test/skills-conformance.test.ts)
Phases
- Identify the gap. What capability is missing? What user intent has no skill?
- MECE check. Review
skills/manifest.jsonandskills/RESOLVER.md. Does any existing skill already cover this? If so, extend it instead of creating a new one. - Create SKILL.md. Use this template:
---
name: {skill-name}
version: 1.0.0
description: |
{One paragraph describing what the skill does and when to use it.}
triggers:
- "{trigger phrase 1}"
- "{trigger phrase 2}"
tools:
- {tool1}
- {tool2}
mutating: {true|false}
---
# {Skill Title}
## Contract
{What this skill guarantees — 3-5 bullet points}
## Phases
{Numbered workflow steps}
## Output Format
{What good output looks like}
## When it fails
Follow the [agent operator protocol](../conventions/agent-operator-protocol.md) for any gbrain error `code`, exit code, `[AGENT]` block or notice block. Specific to this skill:
{2-5 concrete failures this skill hits — error codes, refusals, notices — and what to do and tell the user}
## Anti-Patterns
{What NOT to do — 3-5 items}
## Tools Used
{GBrain operations used, with descriptions}
- Add to manifest. Update
skills/manifest.jsonwith name, path, description. - Add to resolver. Update
skills/RESOLVER.mdwith routing entry in the appropriate category. - Verify. Run
bun test test/skills-conformance.test.tsto confirm the new skill passes.
Output Format
New skills/{name}/SKILL.md file + updated manifest + updated resolver.
When it fails
Follow the agent operator protocol for any gbrain error code, exit code, [AGENT] block or notice block. Specific to this skill:
bun test test/skills-conformance.test.tsfails: the new SKILL.md lacks a required section (Contract, Anti-Patterns, Output Format, When it fails) or frontmatter; add it and re-run.gbrain check-resolvablereports the skill unreachable: add the RESOLVER row in a fitting category, then re-run.
Anti-Patterns
- Creating a skill that overlaps with an existing one (violates MECE)
- Skipping the MECE check against existing skills
- Creating a skill without triggers in frontmatter
- Not updating manifest.json and RESOLVER.md
- Creating a skill without an Anti-Patterns section
FAQ
What does the skill-creator skill do?
Create new skills following the GBrain conformance standard. Generates SKILL.md with frontmatter, Contract, Phases, Output Format, and Anti-Patterns. Checks MECE against existing skills. Updates manifest and resolver.
How do I install skill-creator?
Run npx skills add https://github.com/garrytan/gbrain --skill skill-creator 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/skill-creator/ (personal) or .claude/skills/skill-creator/ (project).
Which AI agents can use skill-creator?
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 skill-creator 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 skill-creator?
It is published by garrytan in garrytan/gbrain. It has 234 recorded installs.
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