EchoBurn
Interactive simulator showing how AI agents retry timed-out calls without an idempotency key and silently multiply real-world side effects.
An agent call to Stripe, SendGrid, or an inventory API times out and gets retried — but the original call already completed on the provider side. Without an idempotency key, every retry fires a new charge, email, or inventory deduction. The agent dashboard reports one clean success (✅ $99.99 processed) while the provider ledger shows four (–$399.96), and the failure never throws an error — it just quietly multiplies. A three-panel view (agent log, network attempts, provider ledger) plus a live idempotency-key toggle shows the exact fix: flip it on and duplicate attempts collapse into a single DEDUP badge. Agent Failure Series #22.
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