Startup Hook Skill for Claude Code on the web

Create SessionStart hooks that install dependencies so tests and linters work in Claude Code on the web sessions.

Hook Basics

Input (via stdin)

{
  "session_id": "abc123",
  "source": "startup|resume|clear|compact",
  "transcript_path": "/path/to/transcript.jsonl",
  "permission_mode": "default",
  "hook_event_name": "SessionStart",
  "cwd": "/workspace/repo"
}