SkillBuilder — A Claude skill for building Claude skills

Building a Claude skill from scratch has friction. The folder name has to be exactly right, the YAML needs real trigger phrases or Claude ignores it, and the instructions need to be specific enough that Claude actually follows them.

SkillBuilder asks you questions across 5 phases, then generates a complete, ready-to-upload skill folder.

Works in English and Spanish.

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What it does

Runs 5 phases in order:

1. Use Case — nails down exactly what workflow the skill should handle
2. Trigger Conditions — writes the description field with phrases users would actually say
3. Workflow Design — picks the right pattern (sequential, multi-MCP, iterative, context-aware, or domain intelligence)
4. Generate Files — outputs the complete SKILL.md ready to copy-paste
5. Validate — runs the full checklist before delivering anything

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Installation

Claude.ai

1. Download this repo as a ZIP (Code > Download ZIP)
2. Inside the ZIP, find the skill-builder/ folder and compress it separately
3. Go to claude.ai > Settings > Capabilities > Skills > Upload
4. Upload the skill-builder.zip

Claude Code

Clone or download this repo, then copy skill-builder/ to your Claude skills directory:

# Mac / Linux
cp -r skill-builder ~/.claude/skills/

# Windows (PowerShell)
Copy-Item -Recurse skill-builder "$env:USERPROFILE\.claude\skills\"

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Usage

Describe what you want to build:

"Build a skill for generating SEO content for my website"
"Crea un skill para planificar sprints en Linear"
"New skill to automate my PDF report workflow"
"Help me make a skill for code review using Sentry"

SkillBuilder asks questions phase by phase and produces the complete skill at the end.

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Folder structure

skill-builder/               ← the skill folder (this is what you upload)
├── SKILL.md                 ← main instructions (5 phases)
└── references/
    └── validation-checklist.md   ← full checklist with explanations per item

README.md                    ← you are here (repo root, not inside the skill)

README.md sits at the repo root. The Anthropic skill spec does not allow README files inside skill folders — that's what SKILL.md and references/ are for.

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Compatibility

Follows the Anthropic Agent Skills open standard. Works on:

• Claude.ai
• Claude Code
• Anthropic API (via container.skills)

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License

MIT.

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Contributing

Found a bug or want to change how one of the phases works? Open an issue or a PR.

If you build a skill using SkillBuilder, add it to the list below via PR.

Skills built with SkillBuilder

(Add yours here via PR)