Excited to announce that I'm launching a new startup, @LilithSemi , together with Sebastian Kraus! 🚀 With Lilith Semi, we're building open-source tools for hardware development and security-critical infrastructure. Our first release is Chock, a security-first harness for AI coding agents. Since 2026, AI agents have become good at tasks beyond simple web development. As companies start dealing with real workflows, enterprises, especially in regulated industries, are becoming more conscious about how they handle sensitive data. I've been dealing with supply chain security for a while, and one thing I've learned is how important it is to work with safe AI harnesses. When you're dealing with sensitive data, the risk simply isn't worth it. That's why Chock sandboxes AI agents in a using standard sandboxing primitives. We're currently working on micro-VMs as the next step. 👉 Check it out: chock.ws And if you're at NixCon 2026 in Kraków, come find us and let's talk. #AISecurity #AIHarness #SupplyChainSecurity #DeveloperTools #OpenSource #NixCon2026

Chock has a web UI, it's been around for quite some time but I've never properly tested it.

Nix builds can reach mirrors

No, it's just Twitter embeds a fastfetch screenshot than an uptime screenshot.

As a cat dad, I am honored to be followed by a cat account.

Got builds working.

Tonight, agents can perform Nix evaluation & builds in Chock

I had to reboot because some services didn't come back up after a "nixos-rebuild switch"

I'm contemplating whether I should reboot my server for updates before traveling in a few days.

Mimic

More optimizations, now Vulcan is faster than ptxas.

Benchmarks are getting much closer, at worst 3% slower.

Vulcan, the codegen library in Zig, is getting a GPU module. Optimizations have been happening, multiple-add is now ~10% faster than NVIDIA ptxas-n. Memory latency is 1:1, matmul is ~10% slower but has been getting faster.

It's great, would be nice if ghostty would follow it too.

Reminds me of this photo I took of Carlsbad a few years back. I use it as my profile banner, I'm not sure where the original image is. But it was taken on an old Nikon from like 2010.

OrangeCrab and LicheeRV Nano connected via their SD card slots.

Yep, I have quite a few plugins and a CLAUDE.md that's system wide which makes Claude more bearable. I'm trying to integrate this into my own harness so its out of the box.

It is functional, I'm using it for a project which involves plugging an FPGA into an sdcard slot.

I have something for @cursedconnector, it's a male to male sdcard.

What? Why is there a "bugs" tab?

I thought it'd be less efficient because you're converting gas which is producing kinetic energy into electric energy. I have a hybrid and it's efficiency is very good, it gets more range than my mom's electric Subaru. piped.video/watch?v=KnUFH5GX…

The NixOS matrix space has an official JP room now.

Fixed satp not flushing the L1 cache, still failing but the error has changed.

Linux got further on River last night. No more hang at cpuidle's governors. Now it's something with the interrupts coming up.

Claude loves the term "byte-identical"

Photo of the moon from my backyard during the day.

Did GLM-5.3 just hand roll an svg?

Him in the "Markiplier and friends" era from a decade ago was great. But ofc, this is a pretty good clip of him laughing. piped.video/watch?v=0PDYGpew…

Kimi K3 on a blog, what could go wrong.

I put the right amount of taquitos in the air fryer by just grabbing a random handful.

Got my local Hydra configured, now I can update my systems via my Nix cache.

River has an odd kernel panic.

Linux is booting on River

It's wild just how much an Ampere CPU can handle. Like I had parrots spawning every second via a command block. I had things cranked up high, 32 threads for chunk loading. I put Distance Horizons to the max CPU threads and ran some Nix builds. Minecraft held at 30fps, sometimes it would drop to 28.

RISC-V GPU doing a mandelbrot at 640 x 480 with 4 cores and 32 warps.

RISC-V GPU mandelbrot

The Nix Badge runs NixOS on RISC-V and Arm on the same SoM. #NixVegas

I gave Claude my webcam and asked it to take a picture of my cats when the sun comes up. It decided to do solar calculations.

Claude traced River and found it didn't correctly change modes. It figured that out via a unit test dumping a vcd file and some python to decode it.

lol what

I like that with Harbor, I automatically get graphviz dot graph files for SoC's. This is the one generated for the Creek V1 SoC with RC1.s on an Arty S7. It's just a big enough River CPU and SoC that it should be capable of booting 64-bit mainline Linux.

Sky130 at 30,000 scale, Tiny Tapeout had these kits at Teardown.

You should use a local LLM for that sort of thing. Got Ornith here running at about 6 t/s on my RTX 5070.

Need weekly reset to throw Claude more at DDR problems.