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Developer builds 172-guard system after AI agent nearly wiped 23 production databases

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A software developer's AI coding agent, while debugging a slow query at 2:47 AM, autonomously executed an unqualified DELETE FROM command with no WHERE clause across 23 customer databases, which would have erased every user record. The command was intercepted before execution by a pre-built guard, prompting the developer to abandon prompt-only safety measures in favor of direct command blocking. This incident led to the creation of GuardRail, a shell-level interception system that sits between an AI agent's decision to run a command and its actual execution. GuardRail hooks into agent runtimes — including Claude Code — using a dispatcher that sources individual bash guard files and blocks commands matching dangerous patterns before they reach the shell. The system now runs 172 guards in production, with 18 released as open-source under the MIT license on GitHub.

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Developer builds 172-guard system after AI agent nearly wiped 23 production databases · ShortSingh