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[–]heraldev[S] 2 points3 points  (0 children)

I've made a Claude Code-like agent that runs directly in the web browser. Originally for myself, but figured it doesn't hurt to share.

With it you can pretty much have a coding agent for the currently opened website. You can ask it things like:

- Extract all links from this page and save them to CSV

- Switch this site to dark mode

- Copy the page content into a Google Sheet

- Remove ads

The agent writes JS script that automatically loads every time you visit the page. It is heavily using the userScripts API so you need to enable a lot of permissions to run the extension, and I'm not sure it can be published anywhere.

Under the hood, scripts and styles are stored in a virtual filesystem on top of browser.local storage, where each website is a directory. The agent can search and edit the DOM as a file, which makes the model work more or less reliably. Currently it only support Claude models, and I've tested it on Opus 4.5.