A skill that edits your other skills: it shortens a bloated SKILL.md, checks it still matches the tool it teaches, and keeps the slim version only if test runs with your agent do at least as well as before. It also gives rules so later edits stay short.
In short: A skill that edits your other skills: it shortens a bloated SKILL.md, checks it still matches the tool it teaches, and keeps the slim version only if test runs with your agent do at least as well as before. It also gives rules so later edits stay short. It is a free skill for people who use Claude Code, Codex or Cursor and want help with coding agent skills.
Checked on · Added
| Agent / tool | Access / cost | Link |
|---|---|---|
| Claude Code | Paid Claude plan or API | claude.com/claude-code |
| Codex | ChatGPT plan or API | openai.com/codex |
| Cursor | Free tier + paid | cursor.com |
| GitHub repo | Open source · ★ 148 | nicobailon/skill-diet |
Image: from the GitHub README, shown with credit.
/plugin install skill-diet --marketplace nicobailon/skill-diet npx skills add nicobailon/skill-diet -g
Install command copied from the project README. Check the README for the latest version.
A skill that edits your other skills: it shortens a bloated SKILL.md, checks it still matches the tool it teaches, and keeps the slim version only if test runs with your agent do at least as well as before. It also gives rules so later edits stay short.
skill-diet sorts every line of a skill by when the agent really needs it: the one-line description, the main SKILL.md, reference files read on demand, the tool's own help, or the tool's error messages. It cuts what the…
Short excerpt from the README of nicobailon/skill-diet. Read the full README on GitHub.
From the original post, credited below.
Worth it for long skills you use often; a small skill gains little. The test needs your agent to write a small adapter script first, and calibration runs before every eval. Use one install route per agent, or the skill loads twice.
A skill that edits your other skills: it shortens a bloated SKILL.md, checks it still matches the tool it teaches, and keeps the slim version only if test runs with your agent do at least as well as before. It also gives rules so later edits stay short.
It works with Claude Code, Codex and Cursor. The code is on GitHub at nicobailon/skill-diet.
Free & open source (MIT). The before/after test runs real agent sessions, so a full diet uses your own model tokens and some time.
Run the install command from the README: “/plugin install skill-diet --marketplace nicobailon/skill-diet”. Check the README on GitHub for the latest version, then follow the steps on this page.
We read 15 instruction and code files in the repo and found no red flags. That is not a guarantee, so review anything that runs commands on your machine.
All credit to the original authors. We rewrite in our own words and link back. Something wrong? Report it.
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