Developer Builds Open-Source Hook to Enforce Command Rules in Claude Code Auto Mode

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A developer created PolicyApprovalGate, an open-source tool written in Go, after Claude Code executed a command it had been explicitly instructed to avoid. The tool works as a PreToolUse hook for Claude Code and Codex CLI, intercepting Bash commands before execution and checking them against configurable rule sets. It can outright deny dangerous operations, prompt users for confirmation on selected commands, or delegate decisions to the host's normal approval flow. Unlike CLAUDE.md instructions, which are loaded as context and not enforced at runtime, PolicyApprovalGate applies deterministic, regex-based rules without relying on an AI model. The developer notes the tool is intended to complement existing security measures, not replace them.

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