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PreToolUse (Grep|Bash)

Hook
0Other

Fires on

PreToolUsematchingGrep|Bash

Immediately before a tool runs — this is where an action can be denied.

Where this sits in a session

  1. Session start→
  2. Prompt submitted→
  3. Prompt expansion→
  4. Before tool use→
  5. After tool use→
  6. Notification→
  7. Before compaction→
  8. Subagent finished→
  9. Turn finished→
  10. Session end

Behaviour unclear — We could not tell from the script whether this hook can block. Read it before installing.

What it runs

Executed automatically when the event fires — no prompt, no confirmation.

command
"${CLAUDE_PLUGIN_ROOT}/scripts/run" hook pre-tool-use lumen

Install it yourself

Paste into .claude/settings.json to run this hook without installing the whole plugin. Adjust the paths to point at your own copy of the scripts.

settings.json
{
  "hooks": {
    "PreToolUse": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "\"${CLAUDE_PLUGIN_ROOT}/scripts/run\" hook pre-tool-use lumen"
          }
        ],
        "matcher": "Grep|Bash"
      }
    ]
  }
}

Shipped by 1 plugin

Installing any of these installs this hook.

lumen240

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