https://mainthread.ai/essays/ Mainthread essays Essays by David Jones on how the studio thinks. 2026-10-12T00:00:00Z David Jones https://mainthread.ai/essays/review-as-a-mechanism/ Review as a mechanism, not a click 2026-10-12T00:00:00Z David Jones Every install through our installer now checks for a review record matching the exact release, and refuses if it is missing or names a different commit or release. https://mainthread.ai/essays/sealing-the-test/ Sealing the test before writing the skills 2026-10-12T00:00:00Z David Jones Before the library's first skill was committed, we sealed the questions. https://mainthread.ai/essays/what-keeps-running/ What keeps running after you stop a tool 2026-10-12T00:00:00Z David Jones A tool that reads your machine's health shouldn't leave its own processes behind.