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Claude Code On-the-Go
Running six Claude Code agents in parallel from an iPhone. A cloud VM, Tailscale, mosh, and push notifications enable async development from anywhere.
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Agentic Engineering Patterns
Patterns for getting the best results out of coding agents like Claude Code and OpenAI Codex. See my introduction for more on this project.
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How Our Rust-to-Zig Rewrite Is Going
For the past year and a half, the team building Roc 's compiler has been rewriting our 300,000 lines of Rust code into Zig , for reasons I'll recap below. We recently passed an exciting milestone: feature parity with the original compiler!
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The Overcomplexity of the Shadcn Radio Button
Radio buttons are built into web browsers. Why are we using a UI library that wraps another UI library that rebuilds radio buttons from scratch? Why does rendering a radio button require multiple dependencies and several kilobytes of JavaScript? How did we make a built-in browser control so complicated?
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I no longer care to work on any Ruby gems so I've archived all my repositories
I’ve decided to archive the source code of my Ruby gems to make it clear that I’m no longer working on them; I’ve written this post to link from them in order to explain why.
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98% isn't much
98% sounds like a lot. If someone wins the lottery 98% of the times they play, they are clearly blessed. Getting a top mark (e.g.: 10/10) on exams 98% of the time will likely lead to an honour diploma.
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I am worried about Bun
Bun is excellent software. Anthropic owns it now, Bun sits under Claude Code, and Claude Code getting worse makes me worried Bun could follow the same enshittification path.
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GPT-6 Astra, looped transformers, and hidden reasoning
A Look at Recurrent Depth, Hidden Chains of Thought, and Recent Research on Looping Transformer Blocks
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Pi Durable
Pi Durable is a new experimental package for long-running, durable, and malleable agents that can run anywhere. A tour of what we built and why.
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Did Claude increase bugs in rsync?
In order to avoid accuastions of this "just being Claude defending Claude," "AI slop," "probably all hallucinations," etc., I've decided it's probably worth explaining a few key points about how this report was created:
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OpenAI bots knew about the RubyGems caching vulnerability
Today Reuters and the Wall Street Journal both reported about rogue AI agents at OpenAI attacking RubyGems.org. https://www.rubyhack.ai/ has an amazing writeup, and you should read it. I just wanted to make a quick post about it because it’s wild. TL;DR: It seems like OpenAI Bots knew about the RubyGems caching…
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Want to write a compiler? Just read these two papers (2008)
It's not about technology for its own sake. It's about being able to implement your ideas.
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Cognitive Debt: When Velocity Exceeds Comprehension
A systems analysis of how AI-assisted development creates a gap between output speed and understanding, and why organizations cannot see it happening.
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Kimi K3 Architecture Overview and Notes
Short architecture note on Kimi K3, including LatentMoE, Kimi Delta Attention, Attention Residuals, NoPE, multimodality, and inference-efficiency choices.
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Everything in C is undefined behavior
If he had been a programmer, Cardinal Richelieu would have said “Give me six lines written by the hand of the most expert C programmer in the world, and I wi...
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Cleaning up after AI rockstar developers
We've all worked with a rockstar developer. They joined the team years ago, full of energy. They had great ideas about new tech, new paradigms, new architectures. Their cutting-edge ideas left everyone else feeling a bit behind and outdated.
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How is the Bun rewrite in Rust going?
I think it’s important to be very Canny when someone makes a claim that supports a company’s large valuation.
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The ChatGPT/Codex app bundles a full copy of LibreOffice
I was poking around in my ~/.cache/ folder using OmniDiskSweeper when I spotted something interesting. The OpenAI Codex desktop app (since rebranded to just ChatGPT) has 1.7GB of stuff in …
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How to Make a Nintendo 64 Game in 2026
Two years ago, I was Porting my JavaScript Game Engine to C for No Reason . I have since found a reason: making a new N64 game!
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Why Janet? (2023)
I never thought it could happen to me. I mean, parentheses? In this day and age? But for the past couple years, my go-to programming language for fun side projects has been a little Lisp dialect called Janet. (print "hey janet") I like Janet so much that I wrote an entire book about it, and put it on The Internet for…
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The three pillars of JavaScript bloat
A brief look at the three main causes of bloat in our JavaScript dependency trees, and how we can start to address them.
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Self-updating screenshots
A blog by James Adam, of lazyatom.com fame.
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The Beam Engine
See how a beam engine works through interactive 3D figures exploring steam, pressure, Watt's condenser, valves, linkages, and the governor.
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Web development is fun again
AI tools brought me back to levels of productivity I haven't felt in years. Web development is fun again.
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Python 3.15's JIT is now back on track
Python 3.15’s JIT is now back on track
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A History of IDEs at Google
Laurent Le Brun's blog
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Apple randomly closes bug reports unless you "verify" the bug remains unfixed
Why do I file bug reports with Apple Feedback Assistant ? I plead insanity. Or perhaps addiction. I seesaw between phases of abstinence and falling off the wagon. I’ve even tried organizing a public boycott of Feedback Assistant, with a list of demands to improve the experience for users, but the boycott never caught…
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Windows native app development is a mess
I tried to build a Windows native app using Microsoft's latest technologies. Now I understand why everyone builds Electron apps.