claude-code-docs

Defined in hooks/hooks.json

{
  "PreToolUse": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/PreToolUse.sh",
          "timeout": 30
        }
      ],
      "matcher": "*"
    }
  ]
}

"Runs pre-tool-safety-check.sh on every PreToolUse event to perform safety checks before tool calls, with potential to block unsafe ones. No bash or file writes."