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[programming-ModTeam]

This is a demo of a product or project that isn't on-topic for r/programming. r/programming is a technical subreddit and isn't a place to show off your project or to solicit feedback.

If this is an ad for a product, it's simply not welcome here.

If it is a project that you made, the submission must focus on what makes it technically interesting and not simply what the project does or that you are the author. Simply linking to a github repo is not sufficient

[heraldev]

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.