01Writingsessays
Essays from building with AI.
Notes from the work as it happens: voice agents, coding-agent infrastructure, AI defense, and trading research.
24 July 2026One Claude Session Cost Me $1,880. It Was Reading Four Novels to Write One Tweet.1.48 billion tokens in one week, 99.6% of them the model re-reading conversations I never closed. Transcript forensics, the cache math nobody does, and the fix that took my bill from $600 a day to $125. Compression tools would have saved almost nothing.21 June 2026Everyone Just Shipped an AI That Watches Your Screen. Almost None of Them Run on Your Machine.At Build 2026 the PC quietly became an agent that sees everything you do. The part nobody's pricing in: your screen is the most sensitive surface you own, and the default architecture streams it to someone else's cloud.19 June 2026Three Tools Want to Cut Your AI Token Bill. They're Fixing Three Different Leaks.Caveman, Headroom, and the proxy I built all promise cheaper agents. Put side by side, they attack three different points in the pipe, and only one of them is aimed at the tokens that actually cost money.1 June 2026Everyone's Burning Millions on AI Coding. I Tried to Fix the Bill, and Built the Wrong Thing.I spent days building a proxy to cut my AI coding bill. The benchmark deleted it, and showed me the one setup change that actually cuts cost by an order of magnitude. It wasn't the model.