Blog

For a decade, 'rewrite it in Rust' was a joke, because rewrites took years. In 2026, Ladybird, Bun, Meta's React Compiler and GitHub's Copilot runtime were all ported to Rust with AI agents in weeks, and a solo developer cloned Photoshop. Cheap rewrites explain the timing. The choice of Rust comes down to who reads the code: when agents write faster than anyone can review, the language whose compiler checks the most wins. How far that has spread, from browsers and kernels to creative tools, and where Rust still isn't winning.

Coding agents are writing more and more Rust, and a lot of people who know Python or TypeScript are about to start reviewing it. Rust from hello world to ownership and borrowing, explained with pictures, then Option and Result, traits and threads, and finally what to look for when an agent hands you a Rust diff.

USD is the scene format Pixar built for its films and open sourced in 2016. What is inside a USD file, why its layers made studios like DreamWorks and Animal Logic rebuild their pipelines on it, and how to write and open one yourself in a few minutes.

One harness, taken apart subsystem by subsystem, in the order a request flows through it: the loop, the prompts, the tool surface, the permission system, the subagents, the context manager, and the undo. Every part is a file you can open, and most of them are smaller than you would guess.

A language model only turns text into text. The loop that lets it read files, run tests and fix its own mistakes is the harness, and it moves results as much as swapping models does. I cloned Claude Code's leaked prompts, Codex CLI and OpenCode to see what they actually do differently.

Convex bills you for reads, not storage. My chat app held a few hundred KB and still read tens of MB a day, because reactive queries re-read everything each time anything changed. Here's what was actually going on, and how I fixed it.

My phone got hot showing a Ludo board that wasn't moving. The render loop was redrawing the same frame 60 times a second, and a dirty flag fixed it. Notes on render-on-demand, pixel ratio, and antialiasing on mobile.

A mentions library inserts text through children instead of value, so iOS never re-runs layout and the input stops growing. One setNativeProps call fixes the wrap without a remount or keyboard flicker.