"A medium does its best work when it's invisible."

Re-reading Andy Matuschak's notes on tools for thought this week while scoping a knowledge tool for a client. The line above isn't his exact phrasing but it's the through-line. A good tool disappears into the work; a bad one demands attention for itself. Most AI products right now are the bad kind — they want to be a destination, a tab you visit, a brand. The interesting ones are the opposite. They sit inside an existing workflow, do one specific thing, and you stop noticing them within a week. That's the bar I'm trying to hit. If a client remembers the AI is there, I've usually built it wrong.