What Are Claude Skills? A Plain-English Guide From Someone Selling Three

The plain-English answer first: a Claude skill is a file that teaches Claude how to do a specific job your way, so you never have to explain that job again. Instructions, conventions, examples, sometimes a command to trigger it, packaged so that Claude loads the expertise exactly when it is needed. That is the whole concept. It sounds small, and it is quietly becoming the most interesting product category on the internet, which is why I have shipped three of them, one has already earned money, and this guide exists to catch you up before the crowd arrives.

The re-explaining problem skills solve

Everyone who uses Claude seriously has jobs they run weekly with a fresh prompt every time: clean up this text the way I like it, format this report our way, capture the tasks from this conversation. Each time, you re-teach the job, slightly differently, with slightly different results. A skill freezes the best version of that teaching into a file. The job becomes a command; the quality becomes consistent; the re-explaining tax drops to zero. If a prompt is a favor you ask once, a skill is an employee who already knows the routine.

How they actually work, minus the mystery

Mechanically, a skill is mostly readable text: a set of instructions describing the job, when to apply it, and what good output looks like, sometimes with reference files alongside. You add it where you work with Claude, and Claude pulls it in when the task matches. There is no compilation, no server, no app-store review. That readable-text nature has a lovely safety property, too: unlike a normal app, you can open a skill and read every single thing it will tell your AI to do before you trust it.

Why this is a big deal for builders (the no-gatekeeper app store)

Here is the part that made me bet three consecutive builds on it. Skills are products with no infrastructure: no backend to host, no database to secure, no uptime to defend, and no platform taking thirty percent or making you wait for review. The file is the product, and it lives inside a tool millions of people already open every day. For a solo builder, those are the best terms any distribution surface has offered since the early web. It is the closest thing the AI era has to an app store, except the door has no bouncer.

Three real examples, with real numbers

Theory is cheap, so here is my actual portfolio of them, revenue included because this site publishes everything. TextScrubr's skill ($29) drops the tool's text-cleaning directly into your own chat; it sold its first copy in August, which was this project's first product revenue. BuiltByBadge ($29 Pro, free tier) is a skill that sets up a "Built by" badge and hub across every site you ship, and asks, whenever you finish one, if you want your badge on it. And JotThread ($29), shipped this week, is the capture layer: type /jot mid-conversation and your notes, decisions, and tasks get filed by project into one Markdown file you own. Combined skill revenue so far: $29 and counting, published live on the dashboard, because early and honest beats polished and vague.

How to think about buying vs. building one

Buy a skill when someone has already sweated a job you do often: the whole value is that the conventions are debugged, and $29 against a weekly annoyance is easy math. Build your own when the job is unique to you, and start embarrassingly small: pick the one task you re-explain most, write down the instructions you keep repeating, and you have version one. The pattern I follow across all three products, and the one I would steal if I were you: one job, one command, output in a format the user owns (Markdown, not a proprietary anything), priced once rather than monthly. The full build-and-launch system behind mine is in the journal free, and packaged in ShipWolf if you want the fast lane.

Where this is heading

My honest read, from inside it: skills today feel like domain names in 1996 or iPhone apps in 2009, a surface most people have not noticed, with the early operators quietly staking out the obvious jobs. The difference is the barrier: there is none. A file, a job, a $29 price, and distribution hustle. The rest of the Claude cluster covers the building side; the weekly log covers what actually sells, as it happens. The door is open, and the crowd is not here yet.

How to build your first skill this weekend

Since the door has no bouncer, here is the actual walkthrough, sized for a weekend. Saturday morning: pick the job, and pick it small. Not "help me with marketing," but "turn my rough bullet points into a launch tweet thread in my voice." The test for a good first job is that you have re-explained it to Claude at least three times this month, because that means the instructions already exist, scattered across your chat history, waiting to be collected.

Saturday afternoon: write the instruction file. Open a plain Markdown document and write what you would tell a sharp new assistant doing this job for you: what the job is, when it applies, the steps to follow, what good output looks like, and, this is the part everyone skips, two or three real examples of input and the output you want. Examples do more work than rules. If your job has conventions (always use sentence case, never use emojis, file under the project name), write them as flat bullet points. You are not programming; you are writing a very good briefing.

Sunday morning: test it against reality. Load the skill where you work with Claude, run the command on real inputs from your actual week, and note every place the output made you wince. Fix the briefing, not the output: every correction you type in chat is a sentence that belongs in the file. Three or four rounds of this and the skill stops surprising you, which is the whole point of the product.

Sunday afternoon, if you want to sell it: package and price. A skill sells on the clarity of its job, so the landing page is almost embarrassingly simple: the job, the command, a before-and-after example, and one price. Charge once, not monthly, $19 to $49 is the honest range for a single-job skill, and put the output in a format the buyer owns so the deal stays clean. Then distribution, the actual hard part: go where people already complain about the job, show the before-and-after, and say what it costs. That is the entire playbook, and the only unusual thing about it is how few people have noticed it works. Two last practicalities from shipping three of these: give the skill a name that says the job (JotThread captures threads; nobody has to guess), and date-version the file itself, because "includes updates to this version" is both an honest promise and the cleanest upgrade path anyone has invented for a product that is, in the end, a very good briefing in a text file.

FAQ

What is a Claude skill in simple terms?

A file, or small folder of files, that teaches Claude how to do a specific job your way, every time, without re-explaining it. Think of it as a saved expertise pack: instructions, examples, and conventions Claude loads when the job comes up. Once added, a one-line command can trigger a whole repeatable workflow.

How do I install or use a Claude skill?

You add the skill's file to where you work with Claude, in claude.ai via projects and capabilities, or in a folder for Claude Code, and then use it by asking naturally or typing its command. There is no app store step: the file itself is the product, which is exactly why solo builders can make and sell them.

Are Claude skills safe to use?

Read them first, and prefer skills that are transparent about what they do: a skill is human-readable instructions, so unlike installing a random app, you can literally open the file and see everything it will tell Claude to do. Favor skills that keep your data local and in formats you own, and be cautious with any that want credentials or send data elsewhere.

Can you really sell Claude skills?

Yes, it is early but real: my text-cleaning skill sold its first copy at $29 in August, and I now sell three skill products. There is no gatekeeper or platform fee, distribution is the hard part, and buyers pay for jobs that are painful to re-explain, not for novelty.