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by Simon Willison's Weblog
Agentic Engineering Patterns (https://simonwillison.net/guides/agentic-engineering-patterns/) > I use the term agentic engineering to describe the practice of developing software with the
GitHub’s slopocalypse (https://www.theregister.com/2026/02/18/godot_maintainers_struggle_with_draining/) – the flood of AI-generated spam PRs and issues – has made Jazzband’s model of open
I was a speaker last month at the Pragmatic Summit (https://www.pragmaticsummit.com/) in San Francisco, where I participated in a fireside chat session about agentic engineering hosted by Eric Lui
1M context is now generally available for Opus 4.6 and Sonnet 4.6 (https://claude.com/blog/1m-context-ga) Here's what surprised me: Standard pricing now applies across the full 1M window for both
Simply put: It’s a big mess, and no off-the-shelf accounting software does what I need. So after years of pain, I finally sat down last week and started to build my own. It took me about five days.
Shopify/liquid: Performance: 53% faster parse+render, 61% fewer allocations (https://github.com/Shopify/liquid/pull/2056) PR from Shopify CEO Tobias Lütke against Liquid, Shopify's open source Ruby
MALUS - Clean Room as a Service (https://malus.sh/) Brutal satire on the whole vibe-porting license washing thing (previously (https://simonwillison.net/2026/Mar/5/chardet/)): Finally, liberation
Coding After Coders: The End of Computer Programming as We Know It
Here's what I think is happening: AI-assisted coding is exposing a divide among developers that was always there but maybe less visible. Before AI, both camps were doing the same thing every day.
Sorting algorithms (https://tools.simonwillison.net/sort-algorithms) Today in animated explanations built using Claude: I've always been a fan of animated demonstrations of sorting algorithms so I
It is hard for less experienced developers to appreciate how rarely architecting for future requirements / applications turns out net-positive. — John Carmack
Agentic Engineering Patterns (https://simonwillison.net/guides/agentic-engineering-patterns/) > Many developers worry that outsourcing their code to AI tools will result in a drop in quality,
Production query plans without production data (https://boringsql.com/posts/portable-stats/) Radim Marek describes the new pg_restore_relation_stats() and pg_restore_attribute_stats() functions that
A recurring concern I've seen regarding LLMs for programming is that they will push our technology choices towards the tools that are best represented in their training data, making it harder for
What I had not realized is that extremely short exposures to a relatively simple computer program could induce powerful delusional thinking in quite normal people. — Joseph Weizenbaum
Codex for Open Source (https://developers.openai.com/codex/community/codex-for-oss) Anthropic announced six months of free Claude Max for maintainers of popular open source projects (5,000+ stars or
Questions for developers: • “What’s the one area you’re afraid to touch?” • “When’s the last time you deployed on a Friday?” • “What broke in production in the last 90 days
Anthropic and the Pentagon (https://www.schneier.com/blog/archives/2026/03/anthropic-and-the-pentagon.html) This piece by Bruce Schneier and Nathan E. Sanders is the most thoughtful and grounded
Agentic Engineering Patterns (https://simonwillison.net/guides/agentic-engineering-patterns/) > The defining characteristic of a coding agent is that it can execute the code that it writes. This
Clinejection — Compromising Cline's Production Releases just by Prompting an Issue Triager (https://adnanthekhan.com/posts/clinejection/) Adnan Khan describes a devious attack chain against the
Introducing GPT‑5.4 (https://openai.com/index/introducing-gpt-5-4/) Two new API models: gpt-5.4 (https://developers.openai.com/api/docs/models/gpt-5.4) and gpt-5.4-pro
Over the past few months it's become clear that coding agents are extraordinarily good at building a weird version of a "clean room" implementation of code. The most famous version of this pattern
Agentic Engineering Patterns (https://simonwillison.net/guides/agentic-engineering-patterns/) > There are some behaviors that are anti-patterns in our weird new world of agentic engineering.
I'm behind on writing about Qwen 3.5, a truly remarkable family of open weight models released by Alibaba's Qwen team over the past few weeks. I'm hoping that the 3.5 family doesn't turn out to be
Shock! Shock! I learned yesterday that an open problem I'd been working on for several weeks had just been solved by Claude Opus 4.6 - Anthropic's hybrid reasoning model that had been released three
Gemini 3.1 Flash-Lite (https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-flash-lite/) Google's latest model is an update to their inexpensive Flash-Lite family. At
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