Guides
Guides for agent skills
20 short guides, grouped by what you are trying to do. Each has something you can use on the page: a score, a table, a checker or a real skill.
Write a skill
- SKILL.md format referenceEvery field, its limit, the folder layout and the errors people hit.
- How to write a Claude skillSeven steps, a weak and a strong description, scored side by side.
- SKILL.md examplesReal skills, annotated, each with its scan score.
- Progressive disclosure for skillsThree levels of loading and how to split a skill across them.
- Reduce skill token usageWhat a skill costs in context, a token estimator, and a trim you can copy.
- Skill quality leaderboardScores for every free skill, three synthetic samples, and what 90+ looks like.
Check a skill
- SKILL.md validatorCheck a skill against the spec, token budgets, clarity and security rules.
- Is this Claude skill safe?The threats to look for, a two-minute read, and what a scanner cannot catch.
- Skill security checklistTwelve checks for a skill you did not write, with a sample of each risk.
- Hidden Unicode in skillsHow invisible characters carry instructions, with a box that reveals them.
- Why your skill is not triggeringWrong folder, bad frontmatter, vague description. How to find which.
Find skills
- Best Claude Code skills for frontendA free taste skill and four paid ones, and what each changes.
- Best Claude Code skills for writingA free humanizer, tone and hook skills, with a before and after.
- Best Claude Code skills for planningA free questioning skill, decision records and scope cutting.
- Best Claude Code skills for sales outreachResearch, openers and follow-ups, with guardrails against spam.
- Best AI video skillsHyperframes, Remotion and GSAP skills, and which to pick.
Use skills in your tool
- How to install Claude Code skillsThree ways to install, the folder paths, and what to do when it does not load.
- Cursor skillsWhere Cursor reads SKILL.md, from its docs, and how to install one.
- Codex and Gemini CLI skillsWhere each tool looks for skills, from their docs, and one folder for both.
- Skills vs CLAUDE.md vs MCPWhen each loads, what it costs in context, and which to reach for.
Paste a SKILL.md or drop a folder. It is scored in your browser and nothing is uploaded.