How To Turn Your Workflow Into A Codex Skill

Start by naming the repeated task.

Then write when the skill should be used, when it should not be used, what inputs it needs, what steps it follows, what output it should return, and how to verify the result.

The best skills are narrow. "Build my business" is not a skill. "Create a comparison page for two SaaS products" is.

Once the workflow is written, add an example prompt, example output, and a context template. Then test it on a real project and remove any vague instructions.

A practical skill structure

Use this structure for most skills:

• Purpose.
• When to use this skill.
• When not to use this skill.
• Required inputs.
• Workflow.
• Output format.
• Quality bar.
• Mistakes to avoid.
• Example prompt.
• Final verification checklist.

The sections are simple, but they force useful decisions. The agent should know exactly what problem the skill solves and what "done" means.

Start with the trigger

The description is one of the most important parts of the skill. It should explain when the agent should use the workflow and when it should avoid it.

Weak description:

Helps with marketing.

Strong description:

Use when Codex needs to turn a product, audience, offer, and objection list into a conversion-focused landing page draft. Do not use for general brand strategy or unrelated blog content.

The stronger version gives the agent a boundary.

Make the workflow testable

Avoid abstract instructions like "make it better" or "write high quality copy." Define the checks:

• Does the output include required sections?
• Does it cite assumptions?
• Does it avoid unsupported claims?
• Does it include a final QA checklist?
• Does it produce a format the user can use immediately?

If the workflow cannot be tested, the skill is not finished.

Test on real work

Run the skill against a messy real input, not a perfect example. Then inspect where the output fails. Tighten the required inputs, add mistakes to avoid, and improve the example.

That iteration is where the value comes from. A skill is not just a markdown file. It is a documented workflow that has survived real use.

If you want this done for you, use the custom skill build offer. If you want examples first, browse all packs or download the free starter pack.