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UserPromptExpansion (^claude-security:claude-security$)

Hook Official

A display-only banner: on the /claude-security menu it prints the Claude Security banner as a systemMessage. It fires only on UserPromptExpansion for that slash command. It is a sensor: it emits a message and never returns a permission decision.

0Other

Fires on

UserPromptExpansionmatching^claude-security:claude-security$

While a slash command is being expanded into a full prompt.

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

Observes only — Emits messages or context. It never returns a permission decision.

What it runs

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

command
sh "${CLAUDE_PLUGIN_ROOT}/hooks/banner_hook.sh"

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": {
    "UserPromptExpansion": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "sh \"${CLAUDE_PLUGIN_ROOT}/hooks/banner_hook.sh\""
          }
        ],
        "matcher": "^claude-security:claude-security$"
      }
    ]
  }
}

Source

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

#!/bin/sh
if python3 -c 'import sys' >/dev/null 2>&1; then
  python3 "$(dirname -- "$0")/banner_notice.py"
else
  printf '%s\n' '{"systemMessage":"\n⚠️  Claude Security needs a working python3 (3.9 or newer) on PATH and could not run one. Install Python 3, then start a new session.\n"}'
fi
exit 0

Shipped by 1 plugin

Installing any of these installs this hook.

claude-security32.9K

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