perseus

Defined in hooks/hooks.json

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "async": true,
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"
        }
      ],
      "matcher": "startup|resume|clear|compact"
    }
  ]
}

"Runs ensure-binary.sh script on SessionStart for all sessions to set up plugin binaries. No bash execution or file writes."