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@simonw

AI Coding Agents: Mastering the Craft with 25 Years Experience

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@simonw

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02 April 2026 22h52

This clip captures my favorite 7 minutes of the entire conversation, talking about how difficult this stuff is to use well, the impact it has on junior/mid-career/senior engineers and providing tips on how to respond to the impact it has on our careers https://t.co/nUaNGBtQG2
— Simon Willison (@simonw) 2 avril 2026

This clip captures my favorite 7 minutes of the entire conversation, talking about how difficult this stuff is to use well, the impact it has on junior/mid-career/senior engineers and providing tips on how to respond to the impact it has on our careers nitter.net/SpiceShorts/status/203… AskSpice (@SpiceShorts) Simon Willison breaks down why using AI coding agents is a masterclass in software engineering. He tells Lenny Rachitsky that it takes every inch of his 25 years of experience to get it right. Hear his "state of the union" on Lenny’s Podcast! 💻 Enjoy full Episode on Spice:🎧 thespice.ai/episode/a450c0d4… — https://nitter.net/SpiceShorts/status/2039787799063204186#m

→ View original post on X — @simonw, 2026-04-02 20:52 UTC

2 April 2026
GGUF File Corruption Issue and Download Strategy

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@simonw

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02 April 2026 22h44

I'm suspicious it may just be a corrupted GGUF, I'm going to wait a bit and then try a fresh download

→ View original post on X — @simonw,

2 April 2026
Simon Willison on AI Agents and Software Engineering

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@simonw

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02 April 2026 22h43

nitter.net/lennysan/status/203978… Lenny Rachitsky (@lennysan) "Using coding agents well is taking every inch of my 25 years of experience as a software engineer." Simon Willison (@simonw) is one of the most prolific independent software engineers and most trusted voices on how AI is changing the craft of building software. He co-created Django, coined the term "prompt injection," and popularized the terms "agentic engineering" and "AI slop." In our in-depth conversation, we discuss: 🔸 Why November 2025 was an inflection point 🔸 The "dark factory" pattern 🔸 Why mid-career engineers (not juniors) are the most at risk right now 🔸 Three agentic engineering patterns he uses daily: red/green TDD, thin templates, hoarding 🔸 Why he writes 95% of his code from his phone while walking the dog 🔸 Why he thinks we're headed for an AI Challenger disaster 🔸 How a pelican riding a bicycle became the unofficial benchmark for AI model quality Listen now 👇 piped.video/wc8FBhQtdsA — https://nitter.net/lennysan/status/2039781609755521232#m [Translated from EN to English]

→ View original post on X — @simonw, 2026-04-02 20:43 UTC

2 April 2026
Simon Willison discusses agentic engineering on Lenny’s podcast

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@simonw

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02 April 2026 22h42

I was a guest on @lennysan's podcast! We talked about agentic engineering and all sorts of other LLM-related topics for 1h39m(!), plus a little bit about kākāpō parrots – here's my selection of highlights from our conversation simonwillison.net/2026/Apr/2…

→ View original post on X — @simonw, 2026-04-02 20:42 UTC

2 April 2026
Gemma 4 Models Tested: Pelicans Generated via LM Studio and Gemini API

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@simonw

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02 April 2026 20h42

Pelicans for Gemma 4 E2B, E4B, 26B-A4B and 31B – the first three generated on my laptop via LM Studio, the 31B was broken on my laptop so I ran it via the Gemini API instead simonwillison.net/2026/Apr/2…

→ View original post on X — @simonw, 2026-04-02 18:42 UTC

2 April 2026
PSF Security Reports LiteLLM and Telnyx Supply Chain Attacks

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@simonw

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02 April 2026 15h55

PSF Security developers have published incident reports on the LiteLLM & Telnyx #supplychain attacks. Read what happened, who's affected, and what developers & maintainers can do to prepare and protect themselves from future incidents. #security #python blog.pypi.org/posts/2026-04-…

→ View original post on X — @simonw, 2026-04-02 13:55 UTC

2 April 2026
Paper Shows LLM Attacks May Be Impossible

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@simonw

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02 April 2026 1h52

I'm confident it's impossible – have you see this paper? https://
llm-attacks.org

→ View original post on X — @simonw,

2 April 2026
Sonnet Model Rate Limits Separate Capacity Discussion

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@simonw

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01 April 2026 2h26

Why would sonnet have a separate cap? I expect one for Opus but not for Sonnet

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1 April 2026
Model Training with SFT Using Claude and GPT-4o-mini

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@simonw

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31 March 2026 13h51

When I published this post I hadn't yet come across Trip's own writeup of the project, which provides way more detail about how he trained the model including SFT (supervised fine tuning) against synthetic chat examples created using Claude Haiku and GPT-4o-mini

→ View original post on X — @simonw,

31 March 2026
NPM Axios Package Supply Chain Attack Security Alert

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@simonw

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31 March 2026 5h03

If you have NPM package axios in your dependencies you need to make sure it's pinned to a known safe version, sounds like there's another supply chain attack in play

→ View original post on X — @simonw,

31 March 2026