txt — Tristan TimblinWriting by Tristan Timblin.https://tristantimblin.dev/Asserting on Agent Behaviorhttps://tristantimblin.dev/txt/asserting-on-agent-behavior/https://tristantimblin.dev/txt/asserting-on-agent-behavior/I built Aptitude — a test harness that lets you run cognitive tests against agent behavior by asserting on tool calls, parameters, and ordering.Mon, 02 Feb 2026 00:00:00 GMTTahoe Mountain Hairhttps://tristantimblin.dev/txt/tahoe-mountain-hair/https://tristantimblin.dev/txt/tahoe-mountain-hair/A hair care routine to reproduce Tahoe's mineral-rich water and dry air in San Francisco's soft water and humidity.Fri, 13 Jun 2025 00:00:00 GMTThe Mega Deskhttps://tristantimblin.dev/txt/mega-desk/https://tristantimblin.dev/txt/mega-desk/Building an 8-foot hardwood standing desk for a shared home office — from sourcing burnt ash in Berkeley to finding an extension cable on Etsy.Sun, 06 Apr 2025 00:00:00 GMTYour Car Knows You're Getting Sickhttps://tristantimblin.dev/txt/why-i-joined-fisker/https://tristantimblin.dev/txt/why-i-joined-fisker/I joined Fisker to build a health product from vehicle signal data — steering patterns, braking behavior, and acceleration habits can detect cognitive decline.Thu, 11 Jul 2024 00:00:00 GMTNo Honey, We Have a Dashboard at Homehttps://tristantimblin.dev/txt/no-honey-we-have-a-dashboard-at-home/https://tristantimblin.dev/txt/no-honey-we-have-a-dashboard-at-home/Internal tools teams spend months building dashboards that are worse versions of things VS Code already provides out of the box.Mon, 22 May 2023 00:00:00 GMT