Most "I cut my token usage by X%" posts hand-wave the number. This one shows the method, the repos, and the case where the tool does basically nothing. I'd rather you trust the result than be impressed by it.
The problem: agents read whole files to see three lines
Watch a coding agent work on a large codebase and you'll see the same loop over and over:
grep -rn "handlePayment" src/ → a dozen file:line hits.
Read four of those files in full — hundreds of lines each — just to see the ~10 lines around each hit.
