文章讨论了自主编码智能体的最新进展，特别关注 Cursor 使用一组 AI 智能体从零开始构建网页浏览器的实验。作者 Simon Willison 最初预测此类成就要到 2029 年才能实现，但指出 Cursor 的 'FastRender' 项目已经提前交付了令人印象深刻的结果。Cursor 的方法涉及数百个并发智能体使用规划器和子规划器来协调任务，编写了超过一百万行代码。尽管最初对项目输出和缺乏构建说明存在怀疑，Cursor 迅速解决了这些问题，使生成的浏览器可运行。Willison 成功构建并测试了浏览器，注意到尽管存在渲染故障但可读性良好，他认为这证明它不仅仅是现有引擎的包装器。他还强调了智能使用 Git 子模块来包含规范，并提到了另一个类似项目 HiWave 浏览器，标志着 AI 辅助编码能力的快速加速。
Scaling long-running autonomous coding. Wilson Lin at Cursor has been doing some experiments to see how far you can push a large fleet of "autonomous" coding agents:
This post describes what we've learned from running hundreds of concurrent agents on a single project, coordinating their work, and watching them write over a million lines of code and trillions of tokens.
They ended up running planners and sub-planners to create tasks, then having workers execute on those tasks - similar to how Claude Code uses sub-agents. Each cycle ended with a judge agent deciding if the project was completed or not.
In my predictions for 2026 the other day I said that by 2029:
I think somebody will have built a full web browser mostly using AI assistance, and it won’t even be surprising. Rolling a new web browser is one of the most complicated software projects I can imagine[...] the cheat code is the conformance suites. If there are existing tests that it’ll get so much easier.
I may have been off by three years, because Cursor chose "building a web browser from scratch" as their test case for their agent swarm approach:
To test this system, we pointed it at an ambitious goal: building a web browser from scratch. The agents ran for close to a week, writing over 1 million lines of code across 1,000 files. You can explore the source code on GitHub.
But how well did they do? Their initial announcement a couple of days ago was met with unsurprising skepticism, especially when it became apparent that their GitHub Actions CI was failing and there were no build instructions in the repo.
It looks like they addressed that within the past 24 hours. The latest README includes build instructions which I followed on macOS like this:
cd /tmp
git clone https://github.com/wilsonzlin/fastrender
cd fastrender
git submodule update --init vendor/ecma-rs
cargo run --release --features browser_ui --bin browser
This got me a working browser window! Here are screenshots I took of google.com and my own website:
Honestly those are very impressive! You can tell they're not just wrapping an existing rendering engine because of those very obvious rendering glitches, but the pages are legible and look mostly correct.
The FastRender repo even uses Git submodules to include various WhatWG and CSS-WG specifications in the repo, which is a smart way to make sure the agents have access to the reference materials that they might need.
This is the second attempt I've seen at building a full web browser using AI-assisted coding in the past two weeks - the first was HiWave browser, a new browser engine in Rust first announced in this Reddit thread.
When I made my 2029 prediction this is more-or-less the quality of result I had in mind. I don't think we'll see projects of this nature compete with Chrome or Firefox or WebKit any time soon but I have to admit I'm very surprised to see something this capable emerge so quickly.