Developer's Cost Monitor Silently Failed for a Week Due to a Common Shell Scripting Trap

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A developer building an autonomous Claude Code environment discovered their cost-monitoring script had two critical flaws: it initially overcounted API spending by 4–6x due to double-summing cumulative log lines, then went completely silent for a week after being 'hardened' with set -euo pipefail. The strict error-handling flag caused the entire script to exit whenever a single command failed, leaving the status bar blank while significant API costs accumulated unnoticed. The developer argues that monitoring scripts should be designed to 'fail open' — displaying a visible 'no data' indicator rather than terminating silently — so users can distinguish between healthy operation and missing data. This principle emerged from real financial stakes: the developer notes that Claude Code's metered API costs can exceed $3,000 in a single week if left unmonitored. The resulting 212-line bash script now exits with code 0 on errors while displaying a visible placeholder, ensuring the dashboard never goes quiet.

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