DoubleShot
An interactive simulator exposing retry amplification — the failure mode where an agent's retry fires on a non-idempotent operation and both calls complete silently, charging users twice.
DoubleShot makes the retry amplification failure mode visceral: a two-panel split shows what the agent saw (one HTTP 200 OK) versus what actually happened (two completed operations). Three real-world scenarios — Stripe double-charge, duplicate password reset email, and warehouse double-order — play out step by step, each returning HTTP 200 with no errors in the logs. A speed selector and step-through controls let you replay the exact moment both calls land silently, plus a fix explanation with copy-ready idempotency key code that prevents the failure.
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