Is It Safe to Install Third-party AI Skills? A 7-Point Checklist

Yes, a third-party AI skill can be safe to install, but only after you inspect it. Treat it like software, not like a harmless prompt, because it can tell your assistant to read files, use tools, or run scripts.

Why caution is reasonable

A skill is a reusable set of instructions. Some contain only a SKILL.md file. Others add templates, data files, or scripts.

That range matters. A plain instruction file can still push the assistant in a bad direction. A script can do much more. The real risk depends on what your assistant can reach: documents, email, code, a terminal, stored keys, or connected services.

One widely reported scan of about 42,000 public AI skills found that roughly 26% contained vulnerabilities and about 5% showed malicious patterns. The ClawHavoc incident made the same point in a sharper way: malicious skills used polished instructions and setup steps to lead people toward harmful downloads.

This does not mean every third-party skill is dangerous. It means “popular,” “well written,” and “safe” are three different claims. The same review applies to free skills. Price is not a safety signal, and a public repository is not a guarantee. OWASP publishes an agentic skills security checklist for the same reason: skills need review before they run.

The 7-point checklist

1. Read the SKILL.md before installing. It should say what the skill does, when it should run, what inputs it needs, what output it creates, and which files or tools it uses. Stop if the description is vague, the instructions do not match the promised job, or the file asks for access it never explains.
2. Read every script. Open each helper file before the assistant runs it. Red flags include curl or wget calls to unknown domains, long Base64 blobs, encoded commands, broad file deletion, file uploads you did not expect, and anything touching ~/.ssh, browser cookies, password stores, API keys, or wallet files. If you cannot understand a script, do not install it until someone you trust can explain it.
3. Use a named, contactable seller. Look for a real person or company, a working support address, clear product pages, and a visible history. Be careful with anonymous bundles, copied listings, and reposted packs with no source. If something goes wrong, you need to know who supplied the files and who can answer for them.
4. Check the access it requests. List the files, folders, network services, and tools the skill expects to use. Give it the least access that can do the job. A resume skill should not need your email, wallet, full home folder, or a shell. A research skill may need the web. It should not also need private documents unless that need is obvious and stated.
5. Test with harmless data first. Start in a fresh chat. Use sample documents, fake names, and numbers that do not matter. Ask the assistant to explain its planned steps before it acts. Watch for wandering behavior, surprise downloads, new tool requests, or attempts to open unrelated files. Do not make the first real test a tax file, a customer list, or private company records.
6. Prefer full contents you can see before purchase. A screenshot and a list of promises are not enough. You should be able to inspect the SKILL.md, templates, supporting files, and any scripts before you rely on the pack. Anthropic’s public skills repository shows the open end of this standard: the files are there to read. A paid pack should not ask for more trust while showing less.
7. Keep the original ZIP. Save the untouched package, its source, the date, and the version. If a skill behaves badly, remove the installed copy and inspect the original. If you need to reinstall, start from the reviewed package instead of a folder that may have been edited by you, the assistant, or an update you did not notice.

If a pack fails the review

Do not install part of it and hope the risky part stays unused. The assistant may load supporting files when the main skill runs. Ask the seller for the missing files, a plain explanation of any script, and a clear statement of the access required. A good seller should welcome those questions. If the answers stay vague, choose a different pack.

Keep short notes on what you reviewed and when. Those notes help if an update changes the files later: compare the new package with the one you approved before replacing it. An update deserves the same care as the first install, especially when scripts or requested tools change.

How AI Services Market packs are built

At AI Services Market, every original pack is readable plain text: a SKILL.md plus a template. The skill page describes the job before you buy, and the pack contents can be previewed before purchase. That design does not make review optional. It makes review possible.

You can browse the AI Services Market directory and apply the same seven checks there as anywhere else: read the instructions, look for scripts, check the requested access, test safely, and keep the original files.

The short answer

A third-party skill is safe enough when you know who made it, can read everything it contains, understand the access it needs, and have tested it without sensitive data. If any of those pieces are missing, pause. A useful skill should survive ten minutes of inspection. That discipline takes minutes and keeps the benefit of skills without handing an unknown author control over your assistant’s tools.