From 309 lines to 200, with every fact still in reach

You'll leave with a CLAUDE.md under 200 lines that still carries the business context Claude needs to answer well. Dan McComb, Manager of Fulfillment and Logistics at BruMate, starts with how Claude knows you in each place you use it. In chat and on mobile, it's your profile preferences, chat memory, and project instructions: easy, but a loose summary you don't control. In Cowork and Claude Code, it's a CLAUDE.md plus the docs it points to. Then three rules that hold wherever you work: give every fact one home, keep the main file under 200 lines by pointing to docs instead of pasting them, and have Claude name conflicts, ask before it edits, and log every change. For anyone using Cowork or Claude Code, or about to start. A lean file is one Claude actually follows.