The author has developed a system for Claude Code to prevent potentially harmful commands from being executed. This system, called PreToolUse, acts as a guardrail that intercepts commands before they run. It uses a deny-by-pattern approach, blocking specific risky command structures like `rm -rf` or piping untrusted scripts directly into the shell, while allowing all other commands by default. If a command is blocked, an exit code of 2 is returned, and a message sent to stderr provides the agent with a reason, allowing it to reroute its action. AI
IMPACT Enhances safety for AI agents by preventing execution of dangerous commands, reducing risks for users.
RANK_REASON The item describes a specific technical implementation for an existing AI model's tool-use functionality.
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