A MIT rule file makes agents talk like cavemen (code and errors never shortened), a local Go proxy compresses what agents read before each call with byte-exact originals recoverable, and middleware brings the same to your own app. JetBrains' 86-task A/B: -8.5% output tokens, quality flat; the repo's pinned 54-run suite: -33.2% input tokens, 18/18 checks passed.