Agent skill

Create Skill

by asgeirtj in asgeirtj/system_prompts_leaks

Create and validate a new Muse skill — project-local in the current workspace by default, or a personal skill staged for muse skills install into the managed personal root.

CC0-1.0Auto-check passed

Install Create Skill

skills CLI
$ npx skills add asgeirtj/system_prompts_leaks --skill create-skill -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install asgeirtj/system_prompts_leaks create-skill --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .claude/skills && cp -r skills-src/Meta/muse-code/skills/create-skill .claude/skills/create-skill && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
create-skill
GitHub stars
69k
Token cost
~1.4k tokens
SKILL.md length
672 words
Files
1
Skills in repo
124
Repo updated
First seen
Licence
CC0-1.0

At a glance

Create and validate a new Muse skill — project-local in the current workspace by default, or a personal skill staged for muse skills install into the managed personal root.

  • Works in 8 steps: Check that does not exist. → Create its parent (.agents/skills or… → Reserve the leaf directory with a… → …
  • Explicitly asks to create a Muse skill
  • SKILL.md covers Scope, Inputs, Safety Checks and Creation Steps, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Create Skill is an agent skill from asgeirtj/system_prompts_leaks. Create and validate a new Muse skill — project-local in the current workspace by default, or a personal skill staged for muse skills install into the managed personal root. Use ONLY when the user explicitly asks to create a Muse skill or invokes the create-skill skill. Do NOT use for ordinary skill usage, code changes, benchmark tasks, or third-party skill/plugin systems.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro… The licence is CC0-1.0.

When your agent uses it

  • Explicitly asks to create a Muse skill
  • Invokes the create-skill skill
  • Ordinary skill usage
  • Benchmark tasks

Example prompts

  • “/create-skill”

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Check that does not exist.
  2. Create its parent (.agents/skills or .agents/skill-drafts) if needed.
  3. Reserve the leaf directory with a no-replace operation. If another process wins
  4. Recheck that the reserved directory resolves inside the current workspace and is
  5. Write /SKILL.md.
  6. Run
  7. Treat the draft as complete only when the validator succeeds, returns
  8. If validation fails, correct the same draft and revalidate. Stop after three

What it can do on your machine

Read from SKILL.md and the folder at commit e31ec21. 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 bash and markdown).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    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

Create Skill loads about 1.4k tokens when it runs. Until then it costs about 97 tokens; SKILL.md has 672 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~97
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k

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

The full file from asgeirtj/system_prompts_leaks at commit e31ec21, republished under its CC0-1.0 licence (© asgeirtj). 672 words, ~1,421 tokens.

Download SKILL.mdSave it as .claude/skills/create-skill/SKILL.md (or your agent's skills folder).
name
create-skill
description
Create and validate a new Muse skill — project-local in the current workspace by default, or a personal skill staged for `muse skills install` into the managed personal root. Use ONLY when the user explicitly asks to create a Muse skill or invokes the create-skill skill. Do NOT use for ordinary skill usage, code changes, benchmark tasks, or third-party skill/plugin systems.

Create Skill

Create one new Muse skill. Use this skill only for explicit Muse skill creation requests, not for ordinary skill usage, code changes, benchmark tasks, or third-party skill/plugin systems.

Two scopes exist (ADR 8975):

  • Project scope (the default): the skill lives in the current workspace at .agents/skills/<skill-id>/.
  • Personal scope (the user asked for a "personal", "user", or "cross-project" skill): the skill belongs in the managed personal root $CONFIG_DIR/skills/<skill-id> ($XDG_CONFIG_HOME/muse, else $HOME/.config/muse). You stage and validate the draft in the workspace, then hand the user one muse skills install command — the store performs the managed install (files + provenance), so skills update and skills uninstall keep working on it.

Never write to a foreign harness root (~/.codex/skills, ~/.claude/skills) or to $HOME/.agents/skills — those are import-only sources, never write targets. Never write directly into $CONFIG_DIR/skills either: the store owns that write, through the install command below.

Scope

  • Create exactly one directory: .agents/skills/<skill-id>/ (project scope) or the staging directory .agents/skill-drafts/<skill-id>/ (personal scope — deliberately OUTSIDE .agents/skills/, so the draft is not loaded as a project skill).
  • Create exactly one required file: <that directory>/SKILL.md.
  • Do not create a plugin, install a plugin, enable a skill, trust a plugin, execute the generated skill, fetch remote content, or write outside the current workspace.
  • Do not add scripts, assets, references, or extra files unless the user explicitly asks for them and the target remains inside the new skill directory.

Inputs

Before writing files, identify:

  • scope: project (default) or personal — personal only when the user asked for a personal/user/cross-project skill.
  • skill-id: a portable lowercase identifier for the directory and frontmatter name.
  • description: one clear sentence for the frontmatter.
  • body: concise instructions that make the generated skill useful on its own.

Ask a short clarification question if the user did not provide enough information to choose a safe skill-id and useful behavior.

Safety Checks

Reject the request before writing when:

  • the destination is not under .agents/skills/ (project scope) or .agents/skill-drafts/ (personal staging) in the current workspace;
  • the requested final destination is a foreign harness root (~/.codex/skills, ~/.claude/skills), $HOME/.agents/skills, or any absolute path outside the two sanctioned roots and the personal staging destination (the workspace .agents/skills/ tree, $CONFIG_DIR/skills/<skill-id>, and .agents/skill-drafts/<skill-id>) — explain the sanctioned path instead;
  • the ID is empty, ., .., contains / or \, starts with -, or contains anything except ASCII lowercase letters, digits, hyphen, or underscore;
  • the ID is a Windows reserved stem such as con, prn, aux, nul, com1, com2, com3, com4, com5, com6, com7, com8, com9, lpt1, lpt2, lpt3, lpt4, lpt5, lpt6, lpt7, lpt8, or lpt9;
  • the destination already exists, is a symlink, or any parent resolves outside the current workspace.
Show full SKILL.md (254 more words)Show less

Creation Steps

Use normal file and shell tools with the current workspace as the base. <dir> below is .agents/skills/<skill-id> (project scope) or .agents/skill-drafts/<skill-id> (personal scope).

  1. Check that <dir> does not exist.

  2. Create its parent (.agents/skills or .agents/skill-drafts) if needed.

  3. Reserve the leaf directory with a no-replace operation. If another process wins the race, stop and report incomplete.

  4. Recheck that the reserved directory resolves inside the current workspace and is not a symlink.

  5. Write <dir>/SKILL.md.

  6. Run:

    sh
    muse skills validate <dir> --json
  7. Treat the draft as complete only when the validator succeeds, returns valid: true, and reports zero diagnostics or warnings.

  8. If validation fails, correct the same draft and revalidate. Stop after three correction rounds and report the remaining validator output as incomplete.

Generated SKILL.md

Use this shape:

markdown
---
name: <skill-id>
description: <one sentence>
---

# <Readable Skill Name>

<Instructions for when and how to use the skill.>

Keep the generated instructions direct and self-contained. Include only behavior the user asked for or that is necessary for the skill to work.

Completion Report

On success, report:

  • the canonical path to the created directory;

  • the validator command and clean result;

  • that no install, enable, trust, or execution step was run;

  • personal scope only: the one command that finishes the managed install into the personal root — run by the user, so the skills store records the install provenance itself:

    sh
    muse skills install .agents/skill-drafts/<skill-id>

    and that the staging directory can be deleted after the install succeeds.

On failure, report:

  • what operation failed;
  • the destination if it was reserved;
  • the remaining diagnostics or tool error;
  • which checks were not completed.

© asgeirtj, CC0-1.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in Meta/muse-code/skills/create-skill of asgeirtj/system_prompts_leaks.

Open the folder on GitHubat commit e31ec21

Compare with similar skills

Create Skill 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.

Create Skill compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Create Skill this skillasgeirtj/system_prompts_leaks69k—~1.4kAutomated safety check: PassCC0-1.0
MuseKevPH2026/muse-catch128—~865Automated safety check: PassAGPL-3.0
MuseKevPH2026/muse-catch128—~1.6kAutomated safety check: NotesAGPL-3.0
Muse Governanceucsandman/DashClaw310—~1.7kAutomated safety check: PassMIT
Muse Feedback Filerwin4r/MuseAI-Skills3361 repos~2.7kAutomated safety check: WarnNone
Quiet MusingZS520L/HanakoPro103—~574Automated safety check: PassApache-2.0

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Questions about Create Skill

What does Create Skill do?

Create and validate a new Muse skill — project-local in the current workspace by default, or a personal skill staged for muse skills install into the managed personal root. Create Skill is an agent skill from asgeirtj/system_prompts_leaks. Create and validate a new Muse skill — project-local in the current workspace by default, or a personal skill staged for muse skills install into the managed personal root.

When should I use Create Skill?

Create Skill fits situations like: explicitly asks to create a Muse skill; invokes the create-skill skill; ordinary skill usage; benchmark tasks.

How do I install Create Skill in Claude Code?

Run `npx skills add asgeirtj/system_prompts_leaks --skill create-skill -a claude-code`. Or copy the skill folder (Meta/muse-code/skills/create-skill in asgeirtj/system_prompts_leaks) into .claude/skills/create-skill in your project. Claude Code loads it when a task matches its description.

How do I install Create Skill in Codex?

Run `npx skills add asgeirtj/system_prompts_leaks --skill create-skill -a codex`. Or copy the skill folder (Meta/muse-code/skills/create-skill in asgeirtj/system_prompts_leaks) into .agents/skills/create-skill in your project. Codex loads it when a task matches its description.

Can I use Create Skill 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 asgeirtj/system_prompts_leaks --skill create-skill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/create-skill, .gemini/skills/create-skill, .github/skills/create-skill and .opencode/skills/create-skill in your project.

What does Create Skill need to run?

SKILL.md names no scripts, command-line tools or credentials: Create Skill is instructions for the agent only.

Does Create Skill access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Create Skill 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 Create Skill use?

Create Skill is published under the CC0-1.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Create Skill use?

About 1.4k tokens (SKILL.md is roughly 5.7k 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 Create Skill?

Skills that share tags, products or a category with Create Skill: Muse (KevPH2026/muse-catch, 128 stars), Muse (KevPH2026/muse-catch, 128 stars), Muse Governance (ucsandman/DashClaw, 310 stars) and Muse Feedback Filer (win4r/MuseAI-Skills, 336 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Create Skill?

asgeirtj (a GitHub user) maintains it in asgeirtj/system_prompts_leaks, which has 69,211 GitHub stars. The repository holds 124 skills in this directory. The repository was last updated on October 8, 2026.

Source: asgeirtj/system_prompts_leaks on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.