How to Replace an AI Skill With One Line in AGENTS.md

Key takeaways

• Many skills boil down to one behaviour you can state in a sentence
• The line goes in AGENTS.md, or CLAUDE.md for Claude Code
• Move, don’t delete: park the original skill until the line has proved itself
• Test with the same task in two sessions and compare the substance, not the formatting
• Formatting preferences, such as emojis or rounds, can be added with a few extra words
• Do not convert skills that run scripts or hold private know-how

Some skills are long documents that say something quite simple. Modern models often need far fewer words to do the same thing, and every installed skill adds to every session.

This guide answers one question: how do you replace an AI skill with one line in AGENTS.md without losing what it did? It builds on our Claude skills clean-up guide and the example in Mark Kashef’s video.

What does replacing a skill with one line mean?

It means swapping a whole skill folder for a single sentence in the instruction file your agent reads at the start of every session. AGENTS.md is an open format that Codex and many other agent tools read. Claude Code reads CLAUDE.md, which can point to AGENTS.md if you keep one shared file.

A skill loads its name and description into each session, then the full instructions when a task matches. A single line is always there, so it should be short and clearly worded.

Which skills can become one line?

Skills that describe a habit or a way of working are good candidates. Skills that run code or hold private knowledge are not. Use this table to decide:

If a skill is useful but only occasionally, there is a third option: store it away and load it on demand. Our sibling guide, How to Load AI Skills Only When You Need Them, Not Every Session, covers that.

How do you replace a skill with one line, step by step?

Summarise, write the line, park the skill, test, then decide. Here is the full routine:

1. Pick one habit-style skill you use regularly.
2. Ask your AI to summarise it: “In one sentence, what behaviour does this skill add that you would not do by default?”
3. Write the line yourself, using plain words and a clear trigger, such as “when…”, “before…” or “if…”.
4. Add it to AGENTS.md (or CLAUDE.md) under a short heading, such as “Working habits”.
5. Move the skill folder out of the folder your tool loads, into a backup folder.
6. Start a fresh session so the old skill is no longer loaded.
7. Run the same task twice: once with the line, once with the skill restored in a separate session.
8. Compare and decide. Keep the line if it does the job. Delete the backup after a week of normal use.

What does a one-line “grill me” look like?

One sentence that tells the AI to ask clarifying questions before it builds anything unclear. Mark says the “grill me” skill, created by Matt Pocock, is around 330 words. He replaced it with a line along these lines.

Here is our own version you can adapt:

“Before you build or create anything new where my instructions are unclear or missing detail, ask me a short series of questions first, one at a time.”

If you like the style of the original, add a second short sentence, such as “Group the questions into rounds.” Mark’s point is that the depth of questioning came from the model, not the 330 words.

How do you test the line against the original skill?

Give both versions the same real task and compare what they produce, not how it looks. A fair test keeps everything else the same.

• Same model and same settings in both sessions
• Same prompt, copied word for word
• Fresh sessions, so earlier chat does not leak in
• Judge the substance: did both ask the important questions or catch the same gaps?
• Run it two or three times, because AI answers vary

What mistakes should you avoid?

The biggest mistake is swapping one kind of clutter for another. Watch out for these:

• Turning AGENTS.md into a dumping ground. It loads every session too, so keep each line short and only keep lines you need everywhere.
• Converting skills that run code. A sentence cannot replace a script.
• Duplicating your memory file. If the preference already lives in memory, do not add it again.
• Deleting before testing. Move first, delete later.
• Writing vague lines. “Be thorough” helps less than a clear trigger and action.

For a fuller tidy-up of rules, memory and plugins, see how to audit your Claude and Codex setup.

Frequently asked questions

The bottom line

Many skills are long ways of saying one thing. Write that one thing as a clear line in AGENTS.md, park the skill, and test both on the same task. If the line holds up, you have a lighter setup with nothing lost. Start with one habit-style skill today, then carry on with the rest of the Claude skills clean-up.

Related posts

• Claude Skills Clean-Up: Which Skills to Keep, Merge or Delete
• How to Load AI Skills Only When You Need Them, Not Every Session
• How to Organise Your AI Workspace for Multiple Clients or Businesses

Garry Knight

I'm Garry Knight, the person behind Prodify Digital. I write about email list building, email marketing, SEO, AI search and the tools that connect them. My aim is to make online marketing easier to understand, so creators and small business owners can make informed decisions about building an audience and keeping people engaged. Here you'll find straightforward guides and product reviews that explain what something does, where it fits and which limitations matter. The focus is on clear explanations and useful next steps—not hype, shortcuts or promises of easy earnings.

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