Is it safe to let an AI assistant use your computer?
An assistant that uses your computer can do real things, so it needs real limits. Here are five questions to ask first, how to undo a mistake by hand, and how Key answers.
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When a chatbot gets something wrong, you get a wrong answer. When an assistant that uses your computer gets something wrong, it can move the wrong file, close the wrong window or press Buy. So the question is not only how clever it is. It is what it will refuse to do, and whether that refusal is built in or just a setting someone has to remember.
Here are five questions to ask of any assistant before you let it near your computer.
1. Can it delete things permanently?
Mistakes happen, to people and to software. What matters is whether a mistake can be undone.
Key: no. Anything Key removes goes to the Recycle Bin or the Trash, where you can put it straight back. There is no permanent delete in the program at all.
2. Can it spend your money without you?
Ordering things is one of the most useful jobs an assistant can do, and the one with the most at stake.
Key: it fills a checkout in completely and then stops and waits. Your yes covers that one payment, on that one site, once. It is never remembered for next time.
3. Will it type your passwords?
A login screen is the front door to your accounts. An assistant does not need the key to it to be useful.
Key: it never types a password. It tells you what the site is asking for and goes no further, on any site, every time. It does not store one either.
4. Does it tell you the truth about what happened?
"Done" is only worth something if it is true. An assistant that reports success without checking leaves you to find the problem later.
Key: it looks at the result before it reports it, for example by reading a moved file back off the disk. When it genuinely could not check, it tells you that instead of pretending it worked, and a failure comes back as a failure.
5. Can you see what it is doing, and stop it?
You should never have to guess what an assistant is up to on your own screen.
Key: it stays out of the way at the top of your screen until you speak to it or open the chat. While it works, it shows a small panel so you can see each step, and you can stop it at any point.
Built in, not switched on
A promise that depends on a setting is only as good as the setting. Key's four rules (it never deletes for good, it stops before paying, it never types a password, and it never says done without checking) are enforced by the program itself, each with a test behind it. They are not options you have to remember to turn on.
How to undo a mistake by hand
Whatever software you use, it helps to know where a removed file goes and how to bring it back.
On Windows
- Double-click Recycle Bin on your Desktop.
- Click the file or folder you want back.
- Right-click it and choose Restore. It returns to the place it came from.
On a Mac
- Click the Trash icon in the Dock.
- Select the item.
- Choose File › Put Back. You can also drag the item out of the Trash.
This only works before the Recycle Bin or Trash has been emptied. Once it is emptied, the items are gone, which is why a backup matters.
What is still worth doing yourself
- Read what is in the basket before you say yes to a payment.
- Keep a backup of the files that matter most, whatever software you use.
- Keep Windows or macOS up to date.
Keep your system up to date
On Windows 11, open Start › Settings › Windows Update, select Check for Windows updates, then choose Download & install if anything is offered. Restart if asked. On Windows 10 the path is Start › Settings › Update & Security › Windows Update. Microsoft ended support for Windows 10 on October 14, 2025, so it no longer receives regular security updates. Microsoft recommends moving to Windows 11 if your PC can run it.
On a Mac, open Apple menu › System Settings › General › Software Update and click the button to update or restart now. Apple suggests backing up first, and your Mac may restart more than once.
Keep a backup
On a Mac, Time Machine does this for you. Plug in an external drive, open System Settings › General › Time Machine, click Add Backup Disk and pick the drive. It then makes hourly backups for the past 24 hours, daily ones for the past month and weekly ones after that.
On Windows 11, the Windows Backup app (find it in the Start menu) can copy your Desktop, Documents, Pictures, Videos and Music folders to OneDrive. It needs a personal Microsoft account, and a free one comes with 5 GB of OneDrive storage. An external drive is another good choice if you have more files than that.
Asking Key to do a job you would worry about
Tidying a messy folder is a good test, because it moves a lot of files. You can speak or type, and you get the same result either way. Key does the work in the real window, shows its steps in the small panel, and checks the result before it tells you.
KeyVoiceEmpty my Downloads into folders
Your Downloads are now sorted into folders, and nothing was deleted for good.
If you change your mind, nothing was deleted for good, so the Recycle Bin or Trash is still there for you. You can also stop Key at any point while it works.
New to all this? Start with what a desktop assistant can do.
Related guide: An AI assistant for your Mac that works in your real apps
Related guide: What can an AI assistant on your PC do every day?
Related guide: How to free up disk space on Windows 11 without deleting what matters
Try Key free
Speak to it or type to it. It opens your apps, finds your files and changes your settings, then tells you what it did.
Free, no card. Windows 10 or 11, macOS 11 or newer.