cache-audit
Installation
SKILL.md
Prompt Cache Audit
Trigger: /cache-audit or "audit my caching" or "check my cache setup"
What it does: Reads your live Claude Code configuration and measures it against prompt caching best practices. Returns a scored report with specific, actionable fixes ranked by token savings.
Background: The API caches the prefix of each request (system prompt, tool definitions, CLAUDE.md, rules, skill registry, MEMORY.md). An identical prefix between turns = ~90% cost reduction on those tokens. ANY change to the prefix invalidates everything after the change point.
When Invoked
Run ALL 8 checks automatically. Do NOT ask for confirmation. Read the relevant files, measure sizes, and produce the full report in one pass.
Use $PROJECT to refer to the current working directory throughout.