How Idempotency Keys Prevent Duplicate Charges in AI Agent Tool Calls

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AI agent runtimes can trigger duplicate tool calls when network timeouts cause retries, potentially charging customers more than once for the same transaction. A developer has outlined a lightweight protocol using idempotency keys to ensure that a retried call is treated as a ledger lookup rather than a fresh execution. The approach requires three components: a model endpoint, a tool service with a ledger, and a fault-injecting proxy that simulates hostile network conditions. A test harness running 200 episodes with randomised ACK drops and duplicate deliveries validates that each order is charged exactly once. The author demonstrated the setup using free-tier infrastructure, noting the protocol is platform-agnostic and reproducible via a fixed random seed.

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