How I turned 18% skill hit rate into 95% — without calling an embedding API once

My Claude Code setup grew to 152 skills. Every session, all 152 descriptions got dumped into the system prompt. The LLM scanned them blindly. When I later checked, keyword matching hit the right skill 18% of the time.

I had three options:

Call text-embedding-3 on every query — costs money, adds latency

Accept 18% as "good enough"

Build something