The article highlights a project called "one-agent-one-browser," born from frustration with the hype surrounding Cursor's FastRender browser. An individual, motivated by this, employed a single Codex CLI agent to create a web browser from scratch. In just three days, this agent produced 20,000 lines of Rust code, successfully rendering HTML and CSS without relying on any Rust crate dependencies, though it does utilize system frameworks from Windows, macOS, and Linux for image and text rendering. The author tested the resulting macOS binary on their blog and noted that it rendered elements like an SVG feed subscription icon, though it encountered an intermittent issue with a missing PNG image. The code behind the project is described as readable, with specific implementations, such as flexbox, showcased. The project challenges the assumption that building a web browser requires complex multi-agent systems and millions of lines of code. Instead, it demonstrates that a skilled engineer with a single coding agent can achieve impressive results with relatively minimal effort. Looking ahead, the author revised their prediction for 2029, suggesting that by then, a production-grade web browser built with AI assistance by a small team could become a reality.