The AI Agent Failure Casebook — 40 Real Post-Mortems That Stop Your Agent Shipping Garbage Under a Green Checkmark

Your agent says success: true. Your dashboard is green. Your user got mojibake.Most AI-agent failures are invisible at the transport layer. This casebook is 40 of those silent killers, drawn from real production failures (not a textbook), each a 5-field forensic entry: failure mode, symptom, root cause, a 30-second copy-paste detection reagent (run it, get CARRIER or CLEAN), and a one-line vaccine.Covers 6 root-cause families: silent status-swallow, encoding/mojibake-under-200, platform-specific no-ops (Windows vs POSIX file locks), measurement-tool-is-itself-buggy, verify-without-falsify (confirmation theater), and trust-not-verify agent chains.Who it's for: developers shipping Claude/GPT/agent pipelines tired of 'it ran fine in dev.' What you get: 40-case markdown + runnable detection reagents + free 10-case sample. Format: single .md. No subscription, no account.

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