Simon Willison’s Weblog

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Monday, 2nd March 2026

I just sent the February edition of my sponsors-only monthly newsletter. If you are a sponsor (or if you start a sponsorship now) you can access it here. In this month's newsletter:

  • More OpenClaw, and Claws in general
  • I started a not-quite-a-book about Agentic Engineering
  • StrongDM, Showboat and Rodney
  • Kākāpō breeding season
  • Model releases
  • What I'm using, February 2026 edition

Here's a copy of the January newsletter as a preview of what you'll get. Pay $10/month to stay a month ahead of the free copy!

I use Claude as a proofreader for spelling and grammar via this prompt which also asks it to "Spot any logical errors or factual mistakes". I'm delighted to report that Claude Opus 4.6 called me out on this one:

5. "No new chicks for four years (due to a lack of fruiting rimu trees)"
The phrasing "lack of fruiting rimu trees" is slightly imprecise. The issue isn't that rimu trees failed to fruit at all, but that there was no mass fruiting (masting) event, which is the specific trigger for kākāpō breeding. Consider "due to a lack of rimu masting" or "due to a lack of mass rimu fruiting."

# 2:53 pm / kakapo, claude, newsletter

Agentic Engineering Patterns >

GIF optimization tool using WebAssembly and Gifsicle

I like to include animated GIF demos in my online writing, often recorded using LICEcap. There's an example in the Interactive explanations chapter.

These GIFs can be pretty big. I've tried a few tools for optimizing GIF file size and my favorite is Gifsicle by Eddie Kohler. It compresses GIFs by identifying regions of frames that have not changed and storing only the differences, and can optionally reduce the GIF color palette or apply visible lossy compression for greater size reductions.

Gifsicle is written in C and the default interface is a command line tool. I wanted a web interface so I could access it in my browser and visually preview and compare the different settings. [... 1,603 words]

# 4:35 pm / claude, ai, claude-code, llms, prompt-engineering, webassembly, coding-agents, tools, generative-ai, gif, agentic-engineering

Sunday, 1st March 2026

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