I Built a 50-Line RAG System That Saves Me 10x Tokens in Claude Code

Every Claude Code user hits the same wall: you ask a question about your codebase, Claude reads 5 files, burns 30K tokens, and your context window is half gone before you've written a single line of code. I fixed this with a local RAG system. 50 lines of Python, zero API costs, 6-10x token savings on every semantic search. Here's exactly how I built it and the real numbers from a 22,000-file Unity project. The Problem: Claude Code Eats Context for Breakfast I work on a large Unity mobile game with 22,000+ C# files.