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Guides with the checks beside the claims.

How to create an agent skill
A step-by-step walkthrough of building a small agent skill from a real task, plus where to put the folder for Claude Code and Codex.
Ravalika Korthiwada · Guide
- Format checked
- Installs checked
- Loads Codex
- Helps not checked
Install and load an agent skill in Codex
How we installed the explain-error skill in Codex CLI on both documented project paths, with npx skills add, and confirmed it actually loaded.
Dhruva Guptha · Guide
- Format checked
- Installs checked
- Loads Codex CLI
- Helps not checked
What we learned moving one skill across hosts
We moved a single SKILL.md folder between Claude Code and Codex and checked what travels cleanly, plus documented incompatibilities we haven't hit yet.
Dhruva Guptha · Guide
- Format checked
- Installs checked
- Loads Codex CLI
- Helps not checked
The SKILL.md format
What goes in a SKILL.md file, which fields the open spec requires, and the complete explain-error example we built and tested against it.
Ravalika Korthiwada · Guide
- Format checked
- Installs checked
- Loads Codex
- Helps not checked
References and assets inside a skill
What happens when a skill's reference file goes missing on Codex, and why the format validator did not catch it, based on a break we caused on purpose.
Chaitanya Karra · Guide
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- Installs not checked
- Loads Codex
- Helps not checked
How to test an agent skill
A four-step testing ladder for agent skills (format, installs, loads, helps) worked through by hand on one real skill, and what each step does not prove.
Chaitanya Karra · Guide
- Format checked
- Installs checked
- Loads Codex
- Helps not checked
What is an agent skill?
A plain explanation of agent skills: the SKILL.md file, progressive disclosure, and where the open format is documented as of September 2026.
Ravalika Korthiwada · Guide
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- Installs checked
- Loads Codex
- Helps not checked
Where agent skills live on each host
A comparison of documented Claude Code, Codex, and Cursor skill folder paths, marking which ones we tested by hand and which are documented only.
Dhruva Guptha · Guide
- Format checked
- Installs checked
- Loads Codex CLI
- Helps not checked
Writing skill descriptions that trigger
What we measured when we compared a vague skill description against a sharp one on Codex, with the trigger counts and a note on sample size.
Chaitanya Karra · Guide
- Format not checked
- Installs not checked
- Loads Codex
- Helps not checked