Testing Install of Prompt API on Chromebook Plus

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Dustin Byers

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Dec 12, 2025, 6:05:11 AM (4 days ago) Dec 12
to Chrome Built-in AI Early Preview Program Discussions
Hello all, I've been using the Prompt API in my browser extension, and am working to debug /test some issues happening specifically on installations on a Chromebook Plus. I am looking for a way to reset the state of a the model/feature installation on browser profile to uninstalled/default. 

I was able to do this on a Macbook by:
1. Uninstalling extension
2. Resetting browser flags
3. Removing the model download from the filesystem

On the Chromebook, I haven't been able to find an easy way to do #3

I am hoping to not have to use a fresh profile for each test, due to authentication flow complexities unrelated to the feature (and that it is a pain  to do:-P ) - Is there an easier way to facilitate this? 

Dustin



Thomas Steiner

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Dec 12, 2025, 7:29:22 AM (4 days ago) Dec 12
to Dustin Byers, Chrome Built-in AI Early Preview Program Discussions
Hi Dustin,

The usual recommended flow is to start Chrome with a command line flag pointing it at a temporary user data directory. You may be able to locate the model file by going to chrome://on-device-internals/ and then the Model Status tab. It should be listed there. Not sure if you have the access rights to make changes there, though. I don't have a Chromebook Plus device to test. Let me know how far you get. If you're stuck, we can investigate further. 

Cheers,
Tom

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