5 Free AI Skills That Make ChatGPT and Claude Actually Useful
Five free downloadable skills for Claude and ChatGPT: Grilling, Idea Refine, ELI5, Unslop, and a report generator. What each does and when to use it.
What are AI skills, and why are people suddenly using more of them?
A skill is a reusable instruction file that Claude or ChatGPT can follow without you retyping the same process in every conversation. Instead of explaining a workflow from scratch each time, you save it once and call it up whenever you need it. Under the hood, skills are mostly plain text (markdown), sometimes with a bit of code attached. Claude was first to support them, accessible for free under Customize > Skills, where you can upload, create, or download skills with a few clicks. ChatGPT added skills more recently, but only inside “Work,” which requires a paid plan. Because skills are just text files, they’re portable between platforms, though the transfer isn’t always perfectly clean.
TL;DR
- Skills are portable text files, not hidden code, so you can open any skill and read exactly what it tells the model to do before you trust it.
- Claude supports skills for free under Customize > Skills, while ChatGPT currently gates skills behind the paid Work tier.
- Grilling is a clarifying-questions skill that forces you to define a vague idea in detail, often through 15 to 25 rounds of questions with suggested answers.
- A custom report generator delays writing until it has clarified scope, researched the topic, and planned a structure, which avoids the sloppy one-shot report problem.
- Idea Refine generates five to eight alternative takes on a concept using lenses like inversion, simplification, and scale.
- ELI5 turns dense topics into simplified, visual HTML explainers, a technique reportedly used internally by Anthropic staff for onboarding onto new ideas.
- Unslop targets “AI slop,” the generic, lazy-feeling output people get when they hand a task to AI and pass it along unedited.
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How do you install a skill in Claude or ChatGPT?
In Claude, go to Customize, then Skills. You’ll see existing skills listed there, with an “Add” button in the top right for uploading a file or creating a new one from scratch. Downloading an existing skill is just as simple: click the three dots next to it and export it. This works even on Claude’s free plan.
ChatGPT’s flow is less obvious. You need access to Work, which sits behind the $20 paid plan. From there, click Plugins on the left sidebar, then find the Skills tab. Use the plus icon to upload a skill file from your computer or to build a new one. Downloading works the same way, via the three-dot menu.
Both platforms also ship a built-in meta-skill for capturing new skills on the fly. Claude calls it the Skill Creator; ChatGPT calls the same function the Template Creator. If you’ve just walked an AI through a multi-step process manually, you can ask the Skill Creator to save that entire workflow as a reusable skill. It’s also the most reliable way to import a skill file that was formatted for the other platform, since pasting raw text and asking the Skill Creator to save it tends to work better than a direct file upload.
What does the Grilling skill do?
Grilling is built to interrogate a vague idea until it has enough clarity to be useful. Say you want to start a business but only have a one-line concept. Running the skill triggers rounds of clarifying questions, grouped by theme (high-level questions first, then business model details, then increasingly specific follow-ups). Each question typically comes with a suggested answer, so you can accept the recommendation or push back with your own. Depending on the idea, this can run anywhere from about 15 to 50 questions before it’s satisfied. The point isn’t speed. It’s that most people skip this step entirely and start executing before they’ve actually defined what they’re building.
When should you use a custom report generator skill instead of just asking for a report?
Asking an AI to “write me a report” usually produces something generic on the first try. A report generator skill fixes this by refusing to write anything until it has gone through several stages: clarifying the scope of the report, searching for relevant information, planning the structure, and only then drafting content, before finally exporting a finished document. This front-loaded clarification acts like a lightweight version of Grilling built specifically for document creation. It’s especially useful if you regularly receive rushed, low-effort AI-generated reports from collaborators, since you can hand them the skill itself as a standard they should follow before submitting work.
What makes Idea Refine different from Grilling?
Grilling narrows down one idea. Idea Refine widens your options. It takes a single concept and generates roughly five to eight variations by running it through different conceptual lenses: inversion (what does the opposite look like?), simplification (what’s the version that’s ten times simpler?), and scale (what would this look like at massive size?). Applied to something like a hot dog stand idea, the skill might produce a stripped-down weekend-only version, an inverted version where you own the equipment but never run it yourself, and a radically simplified pop-up version you could test in a weekend. Some outputs will be impractical. Others surface an angle you genuinely hadn’t considered. The tradeoff is that reading through multiple divergent perspectives at once takes real attention, so it works best when you have the mental bandwidth to actually weigh the alternatives rather than skim them.
Why is the ELI5 skill popular right now?
ELI5 skills have gained attention because they go further than the old “explain it like I’m five” prompt. Rather than just simplifying language, the skill generates an interactive HTML artifact that visualizes a complex topic, breaking it into digestible visual pieces. Applied to something like the U.S. tax system, it can produce a walkthrough showing how a given paycheck gets divided across tax brackets, what a tax return actually represents, and where government spending goes, all rendered as simple visuals rather than paragraphs of explanation. This style of skill is reportedly used internally at Anthropic to help staff get oriented on unfamiliar topics quickly, which is part of why it’s spread. It’s a genuinely useful first step whenever you’re approaching a topic that’s dense enough to resist a plain-text explanation.
Is Unslop worth adding to your skill library?
Unslop addresses “AI slop,” the generic, low-effort output that results when someone hands a task straight to an AI and passes the raw result along without refining it. Unlike the other four skills here, this one wasn’t extensively tested by the creator covering it, it’s more of a bonus pick worth trying rather than a proven daily tool. If you’re regularly cleaning up AI-generated text that sounds hollow or overly templated, it’s worth downloading and reading through before deciding whether it fits your workflow. Because skills are just text files, checking one out costs nothing but a few minutes.
Frequently Asked Questions
Are these skills actually free?
Yes. Skills are markdown text files, and the ones described here (Grilling, the report generator, Idea Refine, ELI5, and Unslop) are freely downloadable and shareable, since they contain no proprietary code, just instructions.
Do I need a paid plan to use skills?
Claude supports skills on its free plan through Customize > Skills. ChatGPT currently restricts skills to its Work feature, which requires a paid subscription.
Can I customize a skill after downloading it?
Yes. Since skills are plain text, you can open one and edit the instructions directly, adjusting question sets, output formats, or added “lenses” to fit your own workflow, the way Idea Refine can be modified to include extra conceptual angles.
Are skills safe to use, since they can include code?
You can inspect any skill before installing it, since it’s readable text (with occasional embedded code). There’s no hidden execution layer, so checking the contents yourself is the simplest way to confirm what a skill will actually do.
Which skill should I try first?
If you only try one, Grilling is the most broadly useful starting point, since clarifying a vague idea is a prerequisite for almost every other kind of work, from writing to planning to building a product.