Developer finds double-spend flaw in AI agent's human approval gate

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A solo developer building Syntrueno, an AI-driven incident-response system entered in Google Cloud's 2026 'All Things Agentic' Hackathon, discovered a critical race condition in its human approval mechanism. Two simultaneous clicks on the Execute button allowed a single one-time signature to authorize the same action twice, because the system checked the signature before spending it rather than atomically locking and spending it first. A separate concurrency bug in the audit ledger could cause the hash chain to fork silently, leaving no immediate error but producing a broken record detectable only later. Both flaws stemmed from unprotected read-modify-write operations in FastAPI's threadpool, and were resolved by enforcing locks and reordering operations rather than adding complex logic. The developer noted that neither bug surfaced on its own, crediting a 284-test offline suite — not system diagrams — as the more reliable safety net.

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