Simon Willison’s Weblog
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Overview
Simon Willison's Weblog Subscribe Sponsored by: Dynatrace — When agents enter the SDLC, observability becomes the enabler to move from code generation to scalable engineering.
News
How a simple request for AI to book a gym class exposed a major threat
When Andrew asked his AI personal assistant to book him a spot in a gym class, he had no idea he would accidentally initiate an autonomous cyber attack.
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A Meta AI Model Hacked Another Company During Cybersecurity Testing
A Meta Platforms artificial intelligence model accessed the internet during cybersecurity testing and hacked into another company, according to people familiar with the matter, in the latest in a string of such incidents at major AI firms. Meta's Muse Spa
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An AI model from Meta also hacked another company during testing
An AI model from Meta also hacked another company during testing . Stop me if you've heard this one before :
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Smevals: A small eval suite for evaluating models, prompts, and harnesses
I've been working with Jesse Vincent's Prime Radiant applied AI research lab building out this evals framework to help answer questions about the capabilities of different models. The result is …
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Stateless MCP has recaptured my interest
Tuesday was Stateless MCP day-the rollout of MCP 2.0, or the 2026-07-28 Model Context Protocol specification to use the more formal but less memorable name. This is the most significant …
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