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Agent skill

Skill Creator

by gustavscirulis in gustavscirulis/snapgrid

Guides you through creating well-structured Claude Code skills with proper modularization, templates, and best practices.

Custom licenceAuto-check: notesAgent Workflows

Install Skill Creator

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill skill-creator -a claude-code

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

GitHub CLI
$ gh skill install gustavscirulis/snapgrid skill-creator --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/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/shared/skill-creator .claude/skills/skill-creator && 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
skill-creator
GitHub stars
117
Used in
1 other repo
Token cost
~2.3k tokens
SKILL.md length
602 words
Files
3
Skills in repo
118
Repo updated
First seen
Licence
Custom licence

At a glance

Guides you through creating well-structured Claude Code skills with proper modularization, templates, and best practices.

  • Works in 5 steps: Understand Requirements → Plan the Skill Structure → Create the Main SKILL.md → …
  • Creating new skills
  • SKILL.md covers When This Skill Activates, Skill Creation Process, Skill Writing Best Practices and Example Skills, plus 7 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Skill Creator is an agent skill from gustavscirulis/snapgrid. Guides you through creating well-structured Claude Code skills with proper modularization, templates, and best practices. Use when creating new skills or improving existing ones.

Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `complex-skill-template.md` and `skill-template.md`).

It sits in Agent Workflows, covering Skill authoring. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…

When your agent uses it

  • Creating new skills
  • Improving existing ones

Example prompts

  • “Use the skill-creator skill to guide you through creating well-structured Claude Code skills with proper modularization, templates, and best practices”
  • “/skill-creator”

Requirements

  • Pre-approved tools (allowed-tools): Read, Write, Glob, Grep, Bash

Workflow steps

5 steps, taken from the step headings in SKILL.md.

  1. Understand Requirements
  2. Plan the Skill Structure
  3. Create the Main SKILL.md
  4. Create Supporting Reference Files
  5. Link References in Main SKILL.md

What it can do on your machine

Read from SKILL.md and the folder at commit eb7eaf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Glob
    • Grep
    • Bash

    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 markdown and yaml).

    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 Creator loads about 2.3k tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 602 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~48
When it runs · the whole SKILL.md, loaded when a task matches
~2.3k

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Glob, Grep, Bash

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 602 words (~2,276 tokens).

“Helps you create well-structured, modularized Claude Code skills with best practices.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
skill-creator
allowed-tools
Read, Write, Glob, Grep, Bash

Read the full SKILL.md on GitHub

Files

SKILL.md and 2 other files in .claude/skills/skills/shared/skill-creator of gustavscirulis/snapgrid.

  • SKILL.md
  • complex-skill-template.md
  • skill-template.md

Open the folder on GitHubat commit eb7eaf4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Skill Creator 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 Creator compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Skill Creator this skillgustavscirulis/snapgrid1171 repos~2.3kAutomated safety check: NotesCustom licence
Skill CreatorAzure/azqr79589 repos~8.2kAutomated safety check: PassApache-2.0
Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase10k11 repos~3.5kAutomated safety check: PassMIT
Darwin Skill Optimizeralchaincyf/darwin-skill6.2k1 repos~4.7kAutomated safety check: PassMIT
Claude Code Command Developmentanthropics/claude-plugins-official38k10 repos~4.8kAutomated safety check: PassApache-2.0
Claude Code Plugin Structureanthropics/claude-plugins-official38k10 repos~3.4kAutomated safety check: PassApache-2.0

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Categories

Questions about Skill Creator

What does Skill Creator do?

Guides you through creating well-structured Claude Code skills with proper modularization, templates, and best practices. Skill Creator is an agent skill from gustavscirulis/snapgrid. Guides you through creating well-structured Claude Code skills with proper modularization, templates, and best practices.

When should I use Skill Creator?

Skill Creator fits situations like: creating new skills; improving existing ones.

How do I install Skill Creator in Claude Code?

Run `npx skills add gustavscirulis/snapgrid --skill skill-creator -a claude-code`. Or copy the skill folder (.claude/skills/skills/shared/skill-creator in gustavscirulis/snapgrid) into .claude/skills/skill-creator in your project. Claude Code loads it when a task matches its description.

How do I install Skill Creator in Codex?

Run `npx skills add gustavscirulis/snapgrid --skill skill-creator -a codex`. Or copy the skill folder (.claude/skills/skills/shared/skill-creator in gustavscirulis/snapgrid) into .agents/skills/skill-creator in your project. Codex loads it when a task matches its description.

Can I use Skill Creator 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 gustavscirulis/snapgrid --skill skill-creator -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-creator, .gemini/skills/skill-creator, .github/skills/skill-creator and .opencode/skills/skill-creator in your project.

What does Skill Creator need to run?

SKILL.md names no scripts, command-line tools or credentials: Skill Creator is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Glob, Grep, Bash.

Does Skill Creator 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 Creator safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Skill Creator use?

Skill Creator has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Skill Creator use?

About 2.3k tokens (SKILL.md is roughly 9.1k 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 Creator?

Skills that share tags, products or a category with Skill Creator: Skill Creator (Azure/azqr, 795 stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars), Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars) and Claude Code Command Development (anthropics/claude-plugins-official, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skill Creator?

gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 118 skills in this directory. The repository was last updated on April 30, 2026.

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