Rust serde people, what do you think of this? gist.github.com/mitsuhiko/f0...
custom_extension.rs
GitHub Gist: instantly share code, notes, and snippets.
gist.github.com
Armin Ronacher
@mitsuhiko.at
Creator of Flask • earendil.com ♥︎ writing and giving talks • Excited about AI • Husband and father of three • Inhabits Vienna; Liberal Spirit • “more nuanced in person” • More AI content on https://x.com/mitsuhiko More stuff: https://ronacher.eu/
Absolutely wild things are happening in the world of AI agents and SOTA models. I really think a lot will change in our world soon as a result of this. openai.com/index/ten-ad...
Ten advances in mathematics and theoretical computer science
OpenAI shares new results on long-standing open problems in mathematics and theoretical computer science, including advances in geometry, cryptography, and complexity.
openai.com
Do you think you will work in or run a software factory in two years for most of your software development?
I promise I will shut up about Codeberg after this :) lucumr.pocoo.org/2026/7/24/co...
Codeberg Divides
Codeberg drew a democratic, but suboptimal line.
lucumr.pocoo.org
We've recently made Pi's cache behavior more visible. This site has been debating whether agent harnesses are helping or quietly torching their caches. That seemed like a good excuse to explain how KV caches actually work and how Pi helps (or doesn't). earendil.com/posts/prompt...
Prompt Caching In Agents | EARENDIL
How prompt caching shapes the cost, latency, tools, and architecture of coding agents, and what Pi does to keep cache behavior visible.
earendil.com
I think this is a very bad move, and the people behind Codeberg should re-consider there stance. blog.codeberg.org/protecting-o...
Protecting our FLOSS commons from LLMs — Codeberg News
.codeberg-design ul { padding-left: revert !important; } In Brief: Two...
blog.codeberg.org
"Story removed by a moderator: End-running the ban on twitter by linking to a forum is not cool. Let's wait a day or two for the inevitable expert writeup." — hilarious. Can't discuss topics if they originate on Twitter on Lobsters.
I appreciate DHH's thoughts, but I disagree on where Europe's problems are, and from where I'm sitting it's not immigration. Thus I wrote a response to his post. dark.ronacher.eu/2026/7/17/li...
Europe Won’t Live By Deporting
A case for focusing on Europe’s actual problems.
dark.ronacher.eu
I wrote this earlier today on lobsters, but the thread was deleted. I feel like I had a conversation of that sort multiple times, so I figured I leave my thoughts on that issue for others to read. It's on the question of not having kids because of the state of the world.
After the Linus post I read a bit more how people judge AI on mastodon and I feel like I'm living in a parallel universe.
I wonder if this will make people reconsider their stance or become even more defensive.
Some late weekend thoughts: What can the bible tell us about vibecoding? lucumr.pocoo.org/2026/7/13/th...
The Tower Keeps Rising
Vibecoding and the possible collapse of a shared language.
lucumr.pocoo.org
Shitty personal attacks in a blog post are one thing, but when people reply “now I like zig even more” really makes me wonder what went wrong in our communities.
One thing I notice more and more is that people think verbal abuse and personal attacks are acceptable, if they are directed at people who don't have a dismissive attitude towards AI and LLMs.
I guess the argument against invite trees as practices on lobsters is the monoculture of opinion that comes from it. Good idea, but suboptimal outcomes in practice if you don't fully align with the vibes.
It feels incredible to me that something that started as a joke during a lunch with a few other nerds like me turned out to be one of the best european coffee shops. theworlds100bestcoffeeshops.com/locales-euro...
Kaffemik - Top 100 Best Coffee Shops
Since 2014, Kaffemik has been more than a spot for coffee, it’s been their way of creating connection in the community. Inspired by the Greenlandic tradition of open‑door hospitality, the founders wan...
theworlds100bestcoffeeshops.com
I had some vibes that Opus 4.8 was performing worse than older ones for some of uses that are off distribution and now I have the receipts. Latest Opus/Sonnet are causing tool invocation failures on Pi's edit tool when older ones did not! I wrote about it. lucumr.pocoo.org/2026/7/4/bet...
Better Models: Worse Tools
About an aggravating tool-calling regression in newer Claude models.
lucumr.pocoo.org
A new post for my other blog. Musings about cycling on the danube island at night and the value of public spaces. dark.ronacher.eu/2026/6/26/te...
The Texture of Civilization
Some of reality’s hidden detail lives inside other people’s lives.
dark.ronacher.eu
Cool! Someone posted my article to lobsters … oh. I guess I should not be annoyed by that but I really stinks that instead of reading some interesting comments you just get stuff like this.
Some more thoughts on looping in coding agents. lucumr.pocoo.org/2026/6/23/th...
The Coming Loop
Loops, harnesses, and why even loop skeptics may end up with them.
lucumr.pocoo.org
People of pi, enjoy a little weekend update! /new with lots of extensions should now be slightly faster. Fixed GLM-5.2 configs on some providers, added a new way to configure reasoning on VLLM and others. edit tool's fuzzy algorithm is no longer touching non-modified lines.
I really like reading Europeans positive experiences with the US during this worldcup. We gotta rebuild relationships, not tear things further down. The US does a lot of stuff right, sport being one of those things.
When I struggle to structure my thoughts about what's happening I turn to writing. Today about the recent US Anthropic ban news, what it says about power and dependency, and what it should mean for Europeans and citizens of the world. It's a long one. lucumr.pocoo.org/2026/6/13/am...
Dangerous Technology For Americans Only
AI nationalism, safety and European weakness.
lucumr.pocoo.org
Some thoughts of mine that nobody asked for on the EU's fight with Apple and my worries related to Mythos and Fable. lucumr.pocoo.org/2026/6/10/ga...
Gaslighting Openness
Control is safety. Openness is danger.
lucumr.pocoo.org
Some weekend thoughts of recent mob behaviors. lucumr.pocoo.org/2026/6/6/com...
Communities of Not
On the strange hostility that grows in communities built around abstinence.
lucumr.pocoo.org
In case you are in the camp of “Andrew Tridgell is vibefucking rsync” please read this.l and adjust your priors. medium.com/@tridge60/rs...
rsync and outrage
I gave up blogging a long time ago (apart from an occasional thing about ArduPilot), I tend to just write code and hope people find it…
medium.com