Iridescence

Conceptual Integrity: To ensure a user-friendly system, a system may deliberately provide fewer features than it is capable of. Modern AI agents do everything (ACP/MCP, Plugins, every FotM API, marketplaces, automation, swarms); Hanabi should do a few things, but do them well.

Never mind, we blue screened

Syscalls are more expensive on startup though; 280 microseconds for file create w/ truncate.

Wasn't expecting Windows Terminal to be that fast; a pleasant surprise. Is it time for Windows-maxxing?

Look at this nerd larping like he created ElysiaJS.

@croloris I didn't even know until I saw this! Definitely going.

Systems Distributed '26 is getting closer and so is the Zig Day Boston scheduled for the day before (completely free, NO conference ticket required). Come practice your systems thinking and make software you can love with us! RSVP: luma.com/eloljzc0

@jayair "An idiot admires complexity, a genius admires simplicity." -- Terry A. Davis

Bun is probably the most intense piece of software created in the last five years, where its moat was its difficulty Rewriting it is so crazy that you wouldn't even consider it I think this'll be remembered as one of the defining moments in the history of coding models

@dkubb @croloris Okay, but are we translating Rust-bun back to Zig or Zig-bun to Rust?

@croloris OpenAI could do the funniest thing right now.

I wonder if GPT5.5 would have done a better job at translating Bun. Now Bun not only has a hard dependency on token expenditure to be maintained, but it's also locked into one model brand, while the competition can choose whichever model happens to be the best at the time.

@rfleury I'm sure that after years of building a team of dedicated Zig engineers, they're gonna be magically equally productive in Rust and totally won't quit because we threw away the last three years of their hard work.

Presented without comment

The prophecy is true Jarred rewrite Bun in Rust in 6 days and rest on the 7th Biblically accurate Jarred

Say what you want, but for people building products on Bun, this is bad news for the foreseeable future. github.com/oven-sh/bun/pu…

It's worth it, even if the network is the ultimate bottleneck. Users should have high quality software. Taking 0.5 seconds to load and 270-300MB at startup for a TUI is completely unacceptable when their competition, Codex CLI (Rust), can do it in a fraction of the time and half the RAM. Software Engineers have a duty to demand higher quality software that people can actually love using and stop making excuses.

@iridescence_dev @ptr_to_joel @joshmo_dev Rust rewrite would solve cold start and IO. But most CC bottlenecks I hit are network bound. Anthropic API plus MCP server roundtrips dominate. The Rust win would be node startup and file system walks. 2x faster in big monorepos, not in small repos.

holy wow they merged it

@luberius_ @ptr_to_joel @joshmo_dev Yeah, I understand the sunk cost. I can just imagine the business meeting: "Claude Code slow. Claude Code use Typescript. Bun make Typescript go vroom. If buy Bun, Claude Code go vroom!"

@iridescence_dev @ptr_to_joel @joshmo_dev If they rewrite Claude Code in Rust, then Anthropic just wasted millions for nothing, lol. Claude Code is the reason they got acquired.

@ptr_to_joel @joshmo_dev I also find it odd that a lot of the phrasing around bun, if you've seen Jarred's hiring post, is about making Claude Code faster, as if the problem isn't solely: we cobbled together AI Generated Typescript badly. If anything they should've just rewritten Claude Code in Rust.

@joshmo_dev also who even understands what all that rust code is doing because that domain knowledge originated in zig

The horror of spending an hour detailing your systems design, taking a step back and realizing: "Oh no I just re-invented a database" and the more you think about the problem in database terms the better the solutions are.

Why is this considered acceptable idle behavior? All I did was open the TUI in a project directory: Claude Code: 277 MB Codex: 107MB (158MB if you include the node wrapper) OpenCode: 426MB & Persistently Higher CPU % A reminder that agents are mostly config + HTTP connections

@zeddotdev's Integrated terminal TUI startup: 4.19ms vs @mitchellh's Ghostty TUI startup: 164μs (25x faster!) Both tests running on Hanabi, my AI Agent TUI. Would love to see libghostty in Zed!

Building Hanabi in #zig and trying to follow #tigerstyle has been great. Startup time is ~400 microseconds to first frame on Ghostty, including loading the Mozilla CA bundle. Needed to use some comptime hackery to reduce RAM usage. Next, the HTTP parser!

Working on Hanabi, my AI Agent TUI. Background by kelezi/@colacolayo