Skill Creator
Meta territory here: a skill that writes skills. This walks you through the full lifecycle of creating Claude Code or Cursor skills, from that initial "I want a skill for X" conversation through drafting, writing test cases, running evals, and iterating on results. It includes guidance on progressive disclosure (keeping skills under 500 lines), crafting descriptions that actually trigger when they should, and organizing bundled resources. Notably tuned to adjust technical jargon based on user comfort level, which matters since apparently plumbers are now opening terminals to use Claude. If you're building skills at any scale or want to understand the skill creation process itself, this is the scaffold.
- skills.sh installs
- 2.5K
- GitHub stars
- 6
- last updated
- Aug 21, 2026
Install
$ npx -y skills add cognitedata/builder-skills --skill skill-creator --agent claude-codeInstalls into .claude/skills of the current project.
Files
Skill Creator
A skill for creating new skills and iteratively improving them.
At a high level, the process of creating a skill goes like this:
- Decide what you want the skill to do and roughly how it should do it
- Write a draft of the skill
- Create a few test prompts and run the agent with access to the skill on them
- Help the user evaluate the results both qualitatively and quantitatively
- While the runs happen in the background, draft some quantitative evals if there aren't any (if there are some, you can either use as is or modify if you feel something needs to change about them). Then explain them to the user (or if they already existed, explain the ones that already exist)
- Use the
eval-viewer/generate_review.pyscript to show the user the results for them to look at, and also let them look at the quantitative metrics
- Rewrite the skill based on feedback from the user's evaluation of the results (and also if there are any glaring flaws that become apparent from the quantitative benchmarks)
- Repeat until you're satisfied
- Expand the test set and try again at larger scale
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- Repository
- github.com/cognitedata/builder-skills
- Categories
- Testing & QA, Skill Development, Debugging
- First seen
- Jun 3, 2026
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