The Hidden Risk of AI Agent Retries: Preventing Duplicate Side Effects

AI agents executing real-world transactions face a critical problem: retries triggered by timeouts or crashes can cause duplicate side effects like duplicate payments or emails without proper execution guards. The Execution Guard Pattern solves this by implementing deterministic request IDs, durable storage, and atomic execution boundaries—ensuring actions execute exactly once regardless of retries. This pattern is essential for any system automating real-world transactions, from payment processing to AI agent tool calls.