How to Use Claude Code's Permission Rules to Block Risky Terminal and Database Commands

Claude Code can execute terminal commands and database queries autonomously, raising the risk of unintended actions like premature git pushes or destructive SQL operations. Its permission system addresses this by routing every tool call into one of three outcomes — allow, ask, or deny — based on pattern rules defined in advance. These rules are stored in a project's .claude/settings.json file, which can be committed to a repository so the entire team shares the same configuration. Developers can apply targeted rules across multiple tools, such as auto-allowing safe git commands while blocking any DROP database query outright. The guide also cautions that overusing 'ask' prompts can cause developers to approve actions without reading them, undermining the system's protective value.