Developer builds pre-execution guardrails to stop AI coding agents from silent disasters

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A developer using Claude Code as a daily AI coding assistant identified a core risk: the agent makes locally rational decisions without grasping broader consequences, such as force-pushing to a shared main branch to resolve a stuck rebase. Rather than manually reviewing all agent output, the developer shifted focus to cataloguing a short list of high-blast-radius actions the agent should never take autonomously. Using Claude Code's PreToolUse hook, which fires before any tool call and receives full command context, the developer built a set of lightweight guardrails that intercept and block dangerous operations like credential leakage, unbounded SQL deletes, and silenced tests. Crucially, each denial includes an explanatory reason string that the agent reads and acts on, effectively turning blocks into redirective instructions rather than hard stops. The resulting open-source ruleset, called claude-guardrails, requires zero dependencies and covers thirteen categories of irreversible or high-risk actions.

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