This week on the newsletter: "How not to mandate device-based age assurance" educatedguesswork.org/posts/device... In this post, we examine a number of enacted or proposed requirements for device-based age assurance and some of the ways they can go wrong.

Some real map/territory confusion in this report by the LA Marathon to give people medals if they drop out after 18 miles (because it's hot). The finisher's medal commemorates that you finished, but it doesn't make you a finisher. www.nytimes.com/2026/03/07/u...

Now up on the newsletter: Let's build a tool-using agent In this post, I walk through in some detail how AI agent tool calling works, including digging into the inputs and outputs of the LLM before they get translated into a coherent-looking JS API. educatedguesswork.org/posts/tool-c...

📣 New from KGI: Age Assurance Online explores how age assurance systems work and their tradeoffs in accuracy, circumvention, availability, and privacy. A must-read for policymakers, service providers + users to understand the consequences of these systems: kgi.georgetown.edu/research-and...

Now up, part II in my series about transparency systems: Certificate Transparency in Reality educatedguesswork.org/posts/transp...

Welcome to Bluesky @rtfm.com ! Folks might recognize EKR from such hits as TLS 1.3, Let's Encrypt, and being Firefox CTO. He also writes a really good blog. Y'all should all follow him.

Hello Blue Sky! Check out first post in my series on transparency systems. educatedguesswork.org/posts/transp...