One Human + One Agent = One Browser From Scratch
January 29, 2026
One Human + One Agent = One Browser From Scratch (via) embedding-shapes was so infuriated by the hype around Cursor’s FastRender browser project – thousands of parallel agents producing ~1.6 million lines of Rust – that they were inspired to take a go at building a web browser using coding agents themselves.
The result is one-agent-one-browser and it’s really impressive. Over three days they drove a single Codex CLI agent to build 20,000 lines of Rust that successfully renders HTML+CSS with no Rust crate dependencies at all – though it does (reasonably) use Windows, macOS and Linux system frameworks for image and text rendering.
We covered the news last week of a browser effectively entirely built by a number of code generation agents. Here is another such project – again, not something that necessarily is going to take on Google Chrome any time soon, but increasing evidence of just how capable these tools are.
