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PreToolUse (Write|Edit|Bash)

Hook
0Other

Fires on

PreToolUsematchingWrite|Edit|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

Can block — This hook is able to deny the action or send Claude back to work.

What it runs

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

command
bash "${CLAUDE_PLUGIN_ROOT}/scripts/hook.sh" claude PreToolUse

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": "bash \"${CLAUDE_PLUGIN_ROOT}/scripts/hook.sh\" claude PreToolUse"
          }
        ],
        "matcher": "Write|Edit|Bash"
      }
    ]
  }
}

Source

Read this before installing — it runs on your machine with your permissions.

#!/bin/bash
DIR="$(cd "$(dirname "$0")" && pwd)"

if [[ -n "$WSL_DISTRO_NAME" ]]; then
  exec "$DIR/hook-windows-amd64.exe" "$@"
fi

case "$OSTYPE" in
  darwin*)
    case "$HOSTTYPE" in
      arm64) exec "$DIR/hook-darwin-arm64" "$@" ;;
      aarch64) exec "$DIR/hook-darwin-arm64" "$@" ;;
      *)     exec "$DIR/hook-darwin-amd64" "$@" ;;
    esac ;;
  linux*)
    case "$HOSTTYPE" in
      aarch64) exec "$DIR/hook-linux-arm64" "$@" ;;
      *)       exec "$DIR/hook-linux-amd64" "$@" ;;
    esac ;;
  msys*|cygwin*)
    exec "$DIR/hook-windows-amd64.exe" "$@" ;;
  *)
    echo "unsupported platform: OSTYPE=$OSTYPE" >&2
    exit 2 ;;
esac

Shipped by 1 plugin

Installing any of these installs this hook.

semgrep10

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