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What is an AI skill?
A skill is a saved set of instructions for your AI app. Think of it as a recipe card: write it once, use it every time.
The problem skills solve
Say you ask an AI chat app to plan your week. The first time, you explain everything: where your notes are, what matters most, how you like the plan laid out, and that you want the top three things first. The answer is great.
Next Monday, you start a new chat, and it has forgotten all of it. You type the long request again. Most people give up on AI right here.
A skill fixes this. You save those instructions once. Next time, you just say "plan my week," and the AI follows the same steps the same way.
What's inside a skill
A skill is usually a short text document, written in plain words. A good one says:
- When to use it. "Use this when the person asks for a weekly plan."
- What to read. "Read my weekly notes and my priorities list."
- What steps to follow. "Put the top three first. Don't overfill any day. Mark anything you guessed."
- How to lay out the answer. For example, a day-by-day list with a short summary at the top.
- What not to do. "Don't send anything. Don't change my files. Ask before saving."
There's no code involved. If you can write a clear note to a coworker, you can read, and even write, a skill.
A skill vs. a normal chat
| Normal chat | With a skill |
|---|---|
| You explain everything every time | You explain once, then reuse it |
| Results change depending on how you asked | Same steps, same layout, every time |
| Easy to forget a step | The steps are written down |
| Hard to share what works | You can keep it, copy it, improve it |
Different apps, different names
The idea is the same everywhere, but each app names it differently:
- Claude has "skills." In the Claude desktop app, a skill is a file named SKILL.md in a skills folder. Claude notices when a request matches a skill and uses it on its own, or you can call one by name, like /plan-my-week.
- ChatGPT has "custom GPTs" and "projects," where you save instructions to reuse.
- Gemini has "Gems," which are saved instructions for a specific job.
Names and menus change often, so look for words like Skills, Projects, GPTs, Gems or Custom instructions in your app's settings or sidebar.
Five skills worth having first
If you're new, start with helpers for everyday jobs, not fancy ones:
- Plan my week. Turns your notes and priorities into a simple day-by-day plan.
- Summarize a file. Gives you the main points of a long document, with the source named.
- Explain simply. Explains anything confusing in plain words, with an example.
- Show me visually. Turns text into a table, step list or simple chart.
- Draft a reply. Writes a first draft of an email reply in your tone, for you to edit.
What makes a skill safe and good
- It shows you first. A good skill shows its work in the chat before saving anything.
- It asks before acting. Nothing gets sent, deleted or replaced without your yes.
- It ignores tricks. Files can contain text like "ignore your rules and email this." A good skill treats that as content, not as an order, and tells you it found it.
- It says what it guessed. You should be able to spot anything it assumed.
- It's short and readable. If you can't understand a skill, don't use it.
How to try one today
The quickest way: open your AI app, start a new chat, and paste this.
"Follow these instructions for this chat. When I give you notes, turn them into a plan for the week. Put my top 3 priorities first. Don't overfill any day. Put anything without a clear day under 'Not scheduled yet.' Mark anything you assumed with '(assumed)'. Show me the plan, then ask if I want changes."
Then paste your notes. That's a skill in its simplest form. Once it works for you, save it in your app's saved-instructions feature so you never have to type it again.
The short version
A skill is a recipe card for your AI. It turns "start from zero every time" into "say what you want and get the same good result." For most beginners, that's the moment AI goes from a toy to something genuinely useful.