This is basically why I built HailMary Fabric.

Claude Code is good, but a lot of the cost is repo discovery: finding files, reading candidates, following imports, etc.

Fabric indexes the repo locally and gives Claude Code the relevant context up front. Nothing goes to HailMary.

Tiny early test on httpx: 58% lower API cost across 2 tasks, both passed tests.

Repo is here if anyone wants to try it or poke holes in it: https://github.com/hailmarylabs/fabric/