Armin Ronacher

mitsuhiko@hachyderm.io

Creator of Flask; Building at <a href="https://earendil.com" target="_blank" rel="nofollow noopener" translate="no">https://earendil.com</a> — writing and talking about system arch, API design and Rust. Love my work? You can sponsor me on GitHub <a href="https://github.com/sponsors/mitsuhiko" target="_blank" rel="nofollow noopener" translate="no">https://github.com/sponsors/mitsuhiko</a>Account here is largely inactive, moved to Bluesky.

Posts

Post #4039496
I think this is a very bad move, and the people behind Codeberg should re-consider there stance. https://blog.codeberg.org/protecting-our-floss-commons-from-llms.html
Post #3971055
Are there people still doubting the utility of these models?
Post #3154959
More musings after some people got upset about the word clanker. https://lucumr.pocoo.org/2026/5/26/clankers/
Post #3154958
Some weekend thoughts of recent mob behaviors. https://lucumr.pocoo.org/2026/6/6/communities-of-not/
Post #2847204
Has been a while since I wrote about agentic engineering, so this time around some learnings of maintaining Pi as a junior maintainer to @badlogic https://lucumr.pocoo.org/2026/5/24/pi-oss/
Post #2812232
I think @antirez ds4.c is important! I wrote down my thoughts on why I built pi-ds4 and why we need to focus our local model efforts stronger than we do currently. https://lucumr.pocoo.org/2026/5/8/local-models/
Post #2812231
Jarred rewrite Bun in Rust in a week with clankers. Say what you want about it, but that’s impressive. Also a reminder that this is happening while plenty of software engineers still dismiss the general utility of LLMs for programming. https://github.com/oven-sh/bun/pull/30412
Post #2042003
I analyzed my coding sessions and on the text interactions some words stand out. And well, they also show up on Google Trends as spiking. Oh and so much slop in my Twitter mentions and on GitHub. Thus here are some updated thoughts on all of this. https://lucumr.pocoo.org/2026/5/4/content-for-contents-sake/
Post #1864512
Trololol. I had the agent start using ua-parser-js, then it read the AGPL license after adding it and backed out immediately. This is hilarious.
Post #1864511
Motivated by how hard “equity” is to translate into German, I wrote about that missing word. https://lucumr.pocoo.org/2026/4/23/equity-for-europeans/
Post #1864510
My kids and I built a little game with pi and codex over the weekend and it was a ton of fun. Some rough edges but with a bit of polishing I think getting agentic coding to be kids friendly is within reach. https://mitsuhiko.github.io/rope-man-game/ I know this website is not very receptive to coding agents still, but so much progress has been made in the last year. At this point they are such a pleasure to work with if you give them a bit of chance. For working with kids we used vanilla pi, V...
Post #1864509
Mario and I talked about Pi and agentic engineering with Gergely Orosz.** **https://www.youtube.com/watch?v=n5f51gtuGHE
Post #1759519
The post by @mitchellh@hachyderm.io gave me the final push to finish my GitHub "obituary". I originally started writing it after the Zig to Codeberg move. It's just a retelling of how I remember OpenSource pre GitHub and what it gave us. https://lucumr.pocoo.org/2026/4/28/before-github/
Post #1354112
After the AI Engineer conference, which was full of useful criticism, I remembered that the most confident takes on AI often came from the least exposure. Rejection is easy, trial and error is expensive. I wrote about it. https://lucumr.pocoo.org/2026/4/11/the-center-has-a-bias/
Post #988438
Since some asked: five months of Absurd in production. Durable execution on plain Postgres with tiny SDKs. The design held up fine, partitioning is still hard and some closing thoughts on the future of Open Source. https://lucumr.pocoo.org/2026/4/4/absurd-in-production/
Post #875741
This evening ends with some darkness. &quot;Just for fun&quot;. https://dark.ronacher.eu/2026/3/14/the-others/
Post #793870
“If someone 50 years ago planted a row of oaks or a chestnut tree on your plot of land, you have something that no amount of money or effort can replicate. The only way is to wait.” https://lucumr.pocoo.org/2026/3/20/some-things-just-take-time/
Post #649656
chardet was vipeforked to MIT and I have thoughts about it. Spoiler: I like it. https://lucumr.pocoo.org/2026/3/5/theseus/
Post #649655
@schwa @btel the FSF is very much aware that if the case goes against them, then it weakens the GPL significantly. So they have to really be certain before they go in front of a court to know it’s going to rule in their favor. That’s why I think we won’t see many cases that want to actually look to careful. The implications could be vast.
Post #649654
@cuddle_puddle @ross Just for the record I remove the sharealike part from the blog license.
Post #309578
@maikel The compiler can take the Linux kernel source and compile it into a bootable linux kernel.
Post #309577
@maikel @kami Bartz v. Anthropic
Post #309576
https://dark.ronacher.eu/2026/2/6/war-in-numbers/
Post #309575
If you wanna critique our Gondolin sandbox approach, I wrote some docs for the security architecture and networking stack: https://earendil-works.github.io/gondolin/security/ https://earendil-works.github.io/gondolin/network/ Would love to get feedback!
Post #309574
This Tweet is making the rounds: &quot;Nearly every ambitious person I know who has dived into AI is working harder than ever, and longer hours than ever. Fascinating dynamic tbh. I have NEVER worked this hard, nor had this much fun with work.&quot; I&#39;m in this Tweet.
Post #309573
This weekend I was thinking about programming languages. Programming languages for agents. Will we see them? I believe people will (and should!) try to build some. https://lucumr.pocoo.org/2026/2/9/a-language-for-agents/
Post #309572
Today Thorsten Ball said he&#39;s the bottleneck. I too am the bottleneck and it made me think. https://lucumr.pocoo.org/2026/2/13/the-final-bottleneck/