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How to Stop an AI Agent From Emailing 400 Customers at 3AM: Budget Caps, Idempotency & a Kill Switch in n8n

Short answer: put one guard step in front of every LLM call and every outbound action. The guard hashes the action into an idempotency key, checks a Postgres ledger for duplicates, checks the client's month-to-date LLM spend against a cap, checks an actions-per-hour limit, and stops the workflow wi…

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  1. 2026-11-02 02:20 · DEV Community — AI
    How to Stop an AI Agent From Emailing 400 Customers at 3AM: Budget Caps, Idempotency & a Kill Switch in n8n

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