A local browser your coding agent can actually finish a job in — file uploads, cross-origin iframes, native dialogs, and downloads, all via CLI/MCP.
A headless browser your coding agent can actually finish a job in.
Claude Code and Codex get a real Chromium they drive from the outside — with none of the restrictions browsers place on in-page automation. So they can log into your internal tools, fill the forms, upload the file, and be done.
We wanted Claude to do a genuinely boring job: log into our internal admin tool, find a record, and attach a document. It got about 80% of the way and then stopped dead — every single time, at the same step.
Browsers require a real human gesture before opening a file picker. That's not a bug or an oversight; it's a deliberate anti-abuse protection, and it's absolute. An agent working through a browser extension or injected JavaScript cannot attach a file to . No amount of cleverness gets around it, because the whole point of the restriction is that no amount of cleverness should.
Which meant our agent could do the interesting 80% and then hand the task back to a human for the tedious 20%. Worse than useless — it created work.
The fix turned out to be a change of vantage point. The restriction applies to code running inside the page. Drive Chromium from outside, over the DevTools Protocol, and setting a file on an input is an ordinary operation — no gesture required, because there's no page-level JavaScript asking for one.
That outside-the-page control comes from Playwright, which is what makes the whole thing possible. agentBrowser is the layer on top: an interface an agent can reason about, credentials it never gets to see, and a single binary you can hand to someone.
From the project README.
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一亩三分地自动签到 + 每日答题：在你自己电脑的 Chrome 里、用你自己的登录完成，不经过第三方；也是给 Claude Code / Codex 用的 MCP 服务。1point3acres daily check-in & quiz automation, local-only, plus an MCP server for AI assistants.
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