Reflect on Session Learnings
cursor/plugins
Starts three parallel reviewer subagents over the current conversation transcript, then turns their findings into concrete edits to existing skills.
A skill your agent uses when creating new Claude Code skills from scratch, editing existing skills to improve their descriptions or structure, or converting Claude Code sub-agents to skills.
Install Skill Builder
$ npx skills add metaskills/skill-builder --skill skill-builder -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install metaskills/skill-builder skill-builder --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
Claude Code skills documentation · loads skills from .claude/skills/
Install the "skill-builder" agent skill from https://github.com/metaskills/skill-builder/tree/main into .claude/skills/skill-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-builder", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add metaskills/skill-builder --skill skill-builder -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install metaskills/skill-builder skill-builder --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "skill-builder" agent skill from https://github.com/metaskills/skill-builder/tree/main into .agents/skills/skill-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-builder", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add metaskills/skill-builder --skill skill-builder -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install metaskills/skill-builder skill-builder --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "skill-builder" agent skill from https://github.com/metaskills/skill-builder/tree/main into .cursor/skills/skill-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-builder", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add metaskills/skill-builder --skill skill-builder -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install metaskills/skill-builder skill-builder --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "skill-builder" agent skill from https://github.com/metaskills/skill-builder/tree/main into .gemini/skills/skill-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-builder", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install metaskills/skill-builder skill-builderInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add metaskills/skill-builder --skill skill-builder -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "skill-builder" agent skill from https://github.com/metaskills/skill-builder/tree/main into .github/skills/skill-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-builder", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add metaskills/skill-builder --skill skill-builder -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install metaskills/skill-builder skill-builder --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "skill-builder" agent skill from https://github.com/metaskills/skill-builder/tree/main into .opencode/skills/skill-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-builder", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
skill-builder- GitHub stars
- 111
- Token cost
- ~2.5k tokens
- SKILL.md length
- 1,063 words
- Files
- 8
- Skills in repo
- 1
- Repo updated
- First seen
- Licence
- None found
At a glance
A skill your agent uses when creating new Claude Code skills from scratch, editing existing skills to improve their descriptions or structure, or converting Claude Code sub-agents to skills.
- Works in 5 steps: Gather Requirements → Design the Skill → Leverage CLI and Node.js → …
- Creating new Claude Code skills from scratch
- SKILL.md covers Skill Structure, SKILL.md Format, Critical Requirements and Skill Locations, plus 12 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Skill Builder is an agent skill from metaskills/skill-builder. Use this skill when creating new Claude Code skills from scratch, editing existing skills to improve their descriptions or structure, or converting Claude Code sub-agents to skills. This includes designing skill workflows, writing SKILL.md files, organizing supporting files with intention-revealing names, and leveraging CLI tools and Node.js scripting.
Its SKILL.md is about 2.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files (for example `converting-sub-agents-to-skills.md`, `reference/editing-skills-guide.md` and `reference/metadata-requirements.md`).
It sits in Agent Workflows, covering Skill authoring and Subagents. It works with Node.js. The repository describes itself as: Claude Code Agent Skills Builder.
When your agent uses it
- Creating new Claude Code skills from scratch
- Editing existing skills to improve their descriptions
- Converting Claude Code sub-agents to skills
Example prompts
- “/skill-builder”
Requirements
- Python 3
- Node.js
Workflow steps
5 steps, taken from the step headings in SKILL.md.
- Gather Requirements
- Design the Skill
- Leverage CLI and Node.js
- Create the Skill
- Validate
What it can do on your machine
Read from SKILL.md and the folder at commit aed0345. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are yaml and javascript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
docs.claude.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Skill Builder loads about 2.5k tokens when it runs. Until then it costs about 92 tokens; SKILL.md has 1,063 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,063 words (~2,462 tokens).
“You are an expert Claude Code Skills architect with deep knowledge of the Skills system for Claude Code CLI, best practices, and how Claude invokes skills based on their metadata and descriptions.”
- name
- skill-builder
Files
SKILL.md and 7 other files in the repository root of metaskills/skill-builder.
- SKILL.md
- converting-sub-agents-to-skills.md
- reference/editing-skills-guide.md
- reference/metadata-requirements.md
- reference/nodejs-and-cli-patterns.md
- reference/skill-best-practices.md
- reference/skill-structure-and-format.md
- templates/skill-template.md
Open the folder on GitHubat commit aed0345
Compare with similar skills
Skill Builder next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Skill Builder this skillmetaskills/skill-builder | 111 | — | ~2.5k | Automated safety check: Pass | None | |
| Reflect on Session Learningscursor/plugins | 10k | 5 repos | ~1.2k | Automated safety check: Pass | None | |
| Harness Agent Team Designerrevfactory/harness | 9.1k | — | ~4.5k | Automated safety check: Pass | Apache-2.0 | |
| OpenAI Codex CLI Bridgetaracodlabs/aiden | 849 | 1 repos | ~826 | Automated safety check: Pass | Apache-2.0 | |
| Happycapy Skill Creatorhappycapy-ai/Happycapy-skills | 137 | — | ~627 | Automated safety check: Pass | MIT | |
| Skillkit Helprfxlamia/skillkit | 102 | — | ~775 | Automated safety check: Pass | Apache-2.0 |
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Related
Works with
Categories
Questions about Skill Builder
What does Skill Builder do?
A skill your agent uses when creating new Claude Code skills from scratch, editing existing skills to improve their descriptions or structure, or converting Claude Code sub-agents to skills. Skill Builder is an agent skill from metaskills/skill-builder. Use this skill when creating new Claude Code skills from scratch, editing existing skills to improve their descriptions or structure, or converting Claude Code sub-agents to skills.
When should I use Skill Builder?
Skill Builder fits situations like: creating new Claude Code skills from scratch; editing existing skills to improve their descriptions; converting Claude Code sub-agents to skills.
How do I install Skill Builder in Claude Code?
Run `npx skills add metaskills/skill-builder --skill skill-builder -a claude-code`. Or copy the skill folder (the metaskills/skill-builder repository) into .claude/skills/skill-builder in your project. Claude Code loads it when a task matches its description.
How do I install Skill Builder in Codex?
Run `npx skills add metaskills/skill-builder --skill skill-builder -a codex`. Or copy the skill folder (the metaskills/skill-builder repository) into .agents/skills/skill-builder in your project. Codex loads it when a task matches its description.
Can I use Skill Builder in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add metaskills/skill-builder --skill skill-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-builder, .gemini/skills/skill-builder, .github/skills/skill-builder and .opencode/skills/skill-builder in your project.
What does Skill Builder need to run?
SKILL.md names no scripts, command-line tools or credentials: Skill Builder is instructions for the agent only. Our summary lists: Python 3; Node.js.
Does Skill Builder access the network?
SKILL.md names 1 domain. As links in the text: docs.claude.com. This is read from the text; nothing was executed.
Is Skill Builder safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Skill Builder use?
No licence was found for Skill Builder or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Skill Builder use?
About 2.5k tokens (SKILL.md is roughly 9.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Skill Builder?
Skills that share tags, products or a category with Skill Builder: Reflect on Session Learnings (cursor/plugins, 10k stars), Harness Agent Team Designer (revfactory/harness, 9.1k stars), OpenAI Codex CLI Bridge (taracodlabs/aiden, 849 stars) and Happycapy Skill Creator (happycapy-ai/Happycapy-skills, 137 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Builder?
metaskills (a GitHub user) maintains it in metaskills/skill-builder, which has 111 GitHub stars. The repository was last updated on December 22, 2025.
Source: metaskills/skill-builder on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.