Humans and agents share one thing: they are both non-deterministic. He talks about the issue of tracking memory lifecycles manually in zig so it can be explicitly freed. As expected, this leads to a long list of bugs where people missed things.

Rust does this automatically. It removes an entire class of errors from his backlog. From an engineering management perspective, this looks like a pretty good trade.

The bonus here is that compiler errors are exactly the kind of deterministic guardrail you need to put around coding agents. Claude works really well if you give it a way to test for correctness and "make it compile" is a pretty good target.

There's a general version of this: the artifact you expose plus the test you run on it. Deterministic tests turn stochastic output into a hard guarantee. Wrote it up here if useful: https://michael.roth.rocks/blog/verification-surface/

Personally my take on the entire affair is quite negative, whatever Jarred or Simonw says about it.

I think Bun owned by Anthropic and the entire rewrite with AI is not the real point (even if it's quite interesting, though).

My take is that Jarred, and Bun,didn't demonstrate a serious, adult approach, from "this is my branch, you are overreacting" message to just proceeding with a 1mil+ PR merged in less than month.

The communication is the issue, and it was handled very badly, in a way that impacted trust and divisions.

Was it so difficult to adopt the approach that the TS team adopted for 7.0?

And so, the FOSS project "Bun" silently dies in darkness and is now something completely else. I'm glad I still had "Investigate if Bun is worth it" on my TODO list and hadn't yet gotten to it.

What is the governance structure for Bun by the way? Couldn't find any documents/explanations about how it's supposed to work. I'm guessing it's essentially just "Anthropic decides what gets done and accepted" today?

The fact that Anthropic felt the need to buy a runtime so they could make their TUI better speaks more to the quality of engineering than anything else IMO.

If rewrites are so easy, why not rewrite CC in a native language? Would’ve been a hell of a lot cheaper.

Couldn't they have rewritten Claude Code in Rust directly? No more need for a JS runtime, better performance, etc... If their agents can do Zig to Rust, why not JS to Rust?

If it run as good as before or even better, then that's kinda impressive.

I'm a developer so I really don't like it when AI might took my job, but if everyone on this planet could create a software for themselves exactly as how they wanted with just a few simple demands, that will change the world for the better.

Think of it as a democratization of technology. You don't want Microsoft stealing your data? Just ask a AI to write an OS for you. You don't want Google to listen to what you're saying? Just ask a AI to design a phone for you. If one day the AI ended up doing that, it will be the ultimate technology self-sufficient. In front of that, your job security is insignificant.

It is also why keeping the tech open source is that much important. Otherwise, it's still the same old shit again and again, and, you lose your job too.

> Maybe I’m taking crazy pills, but I’m still stuck on “why the hell does a TUI need to run in terminal React by way of JavaScript”

> The fact that Anthropic felt the need to buy a runtime so they could make their TUI better speaks more to the quality of engineering than anything else IMO.

> If rewrites are so easy, why not rewrite CC in a native language? Would’ve been a hell of a lot cheaper.

It turns out, there's some similar sentiments in the last year ish:

https://news.ycombinator.com/item?id=47043325

https://news.ycombinator.com/item?id=47105720

https://news.ycombinator.com/item?id=48001113

https://news.ycombinator.com/item?id=46134570

https://news.ycombinator.com/item?id=46124596

I'm not a fan of any of the technologies, companies, or people related to this. I just couldn't shake the feeling that I've seen similar comments.

September and all.

When this happens, a link shows up to report the issue. It’s not clickable (likely due to the segfault), and perhaps more important: it’s encoded, so you can’t see what you would be sending in your report.

Hope it gets better.

Yes if we had a Zig->Rust transpiler maybe it would produce similar output. But I can’t find one. We’d have to use an agent to build one first :)

A dirty secret of AI data centers are that they’re only getting 40-60% efficiency out of their GPU clusters and because the moneygun go brrrrr they just buy more.

You wonder why they’re so afraid of the Chinese competition… they can’t afford to be as wasteful

The rewrite may work out on a technical level or it may not. Let's wait and see. The Bun project did not swear a blood oath to use Zig forever, and it's ultimately their choice to switch to a different programming language.

Beyond that, people seem to be incredibly emotionally involved with this, for reasons that entirely escape me.

Project-wise, nothing has changed.

Bun was always great because of the fantastic dx - it was just really easy to use , with stuff like out of the box typescript (unreal that it took so long for node, and it's behind a super long flag, wtf...). And it didnt have the weirdness of deno, it maintained backwards compatability with node api, and it just worked.

But it was never stable. You'd have to be fool to believe that a single project could stably do everything bun covers. It's always been an insane project. It was built on top of zig, a langauge that hasn't reached 1.0, and is constantly changing, and throw in how he was rewriting his own custom zig stuff. Like c'mon, let's apply some common sense here.

For me, little has changed. I am still going to use bun as a nice dev tool, and use node for production.

I am curious how this will work going forward from FOSS perspective. Will humans be allowed to modify the generated code? Only the .md prompts for the agents? Or what?

Can you select text with shift + arrow keys now in the command line client? :)

AI is pretty good at rewrites and ports. Quite good infact.

I have a long running side project I migrated to bun, and I'm starting to regret it. I don't want to build on top of this much churn.

Claude Code is closed source, doesn't let me extend it beyond hooks, and these I write in bash anyways.

That all said, why should I bother about this change? Feels like a nothing burger to me, as an end user. This should matter more for those that are internal to Claude Code and Bun developing it.

And the crowd is cheering.

you are welcome

If projects like Bun can be substantially rewritten and shipped to millions of users, it suggests we're entering a very different phase of software development.

Today's AI-generated rewrites may not produce code that humans would consider high quality or maintainable. But I'm beginning to wonder whether that will even matter in a few months. If AI is the primary consumer, maintainer, and refactorer of code, human readability becomes far less important than correctness, performance, and the ability to iterate.

This feels like a shift where software may no longer exist as a long-lived artifact in its current form. Instead of writing and maintaining applications for years, we may generate, adapt, and discard them continuously for each use case.

Just that?

I was expecting more from that rewrite. Maybe Rust is not so worth it after all.

While everyone here in this forum kept arguing (and fighting and yelling at each other) whether tis moral/right/secure/cheap for ppl to rewrite and ship a major software package with LLMs/agents, one of the main drivers behind AI actually did it, without consulting your opinion, and most same everyone actually slurped this decision without paying a a notice.

Boring is good, but this boring is super massive major thing that happened, and precisely because security is still intact.

My anxiety before merging a 2K lines PR is greatly reduced after 3 frontier models (Fable, 5.6 and kimi K3) finds no issues in it.

Just 6 months ago (Opus 4.6) this was not true, a big PR would have countless number of issues.

Aside from the human drama, the message to all of us is - these things are ready for whatever your imagination can throw at them.

I think that's exactly what Anthropic wanted to communicate.

Any time I see any of those words "Kagi" too I immediately ignore whatever they're trying to sell.

Nobody ever believed these people were creative technologists. Anyone who uses any of these buzzwords is a hack.

Real LLMs are ran locally on real computers (not in data centers optimizing for cost).

Real software is written in C++ and JavaScript.

The browser is Chrome, until someone does something better.

I don't make the rules.