Developer halves $312 Anthropic bill by adding two bash hooks to Claude Code

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A developer cut their monthly Anthropic API bill from $312 to $156 by implementing two bash hooks in Claude Code that prevent costly token-burning retry loops. Around 60% of the original bill stemmed from Claude repeatedly attempting to diagnose failed Cloudflare D1 database migrations, with each retry spiral consuming 40–60K tokens. A PostToolUse hook now intercepts failed migration commands immediately and flags a Cloudflare KV key, triggering a Slack alert so the developer can intervene before the agent investigates further. A second PreToolUse hook blocks deployment commands when the agent is operating on the main branch, a safeguard added after a misdirected production deploy briefly broke two Workers. The developer notes that hooks returning exit code 2 pass stderr messages directly to the agent as context, making specific, instructive error messages far more effective than generic block notices.

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