If your Claude Code API bill feels high, the cause is rarely too many turns. It is a handful of measurable patterns: re-reading the same files, oversized tool output, and cache misses. The data is in the transcripts Claude Code already writes to ~/.claude/projects/. Full guide and a free tool: https://github.com/Ludoonus/claude-token-report
These practices are covered in depth in The Claude Code Operator's Handbook — 18 chapters on running AI coding agents safely and efficiently. Read a free sample or get it ($29).
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