Simon Willison’s Weblog
aws-emulator . Finally, an official emulator from AWS to run tests against a local clone of their many different services without having to provision a paid API key to do so.
It's written in Rust by a huge swarm of agents - 29,684 commits in the first three weeks of the project. Swaminathan (Swami) Sivasubramanian wrote about how it came to be in a guest post on Werner Vogels' blog.
It currently requires Docker to run on macOS or Windows. I'm hoping they fix that in the future - it would be great if you could download a single binary and use that as part of a standard test suite in other languages and on other platforms.
Recent articles
Locating the source of a mysterious beep with Claude - 9th November 2026
Hide your slop PR descriptions behind <details><summary> - 9th November 2026
Qwen 3.8 27B on my laptop can interpret model weights, too - 3rd November 2026
The U.S. Census Bureau and “Super Intelligence” - 2nd November 2026
This is a link post by Simon Willison, posted on 11th November 2026 .
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