Sync Start

Show what has changed in other sessions and in _shared.md since this session last checked in.

Steps

1. Determine current session name:
   • If remembered from earlier /sync-init in this conversation → use that
   • Else: read .sync/_active.json, list all session names, ask user which one is "this session"
   • If .sync/ doesn't exist → tell user to run /sync-init <name> first and exit.
2. Read _active.json — get current session's last_seen_shared and last_seen_sessions map.
3. Check _shared.md:
   • Read file's mtime (stat -f %m .sync/_shared.md on macOS; stat -c %Y on Linux)
   • If mtime > last_seen_shared → read file, show "Shared Context updates since last check" section
4. Check other session files: For each .sync/*.md file (except _shared.md and <current-session>.md):
   • Get mtime
   • If mtime > last_seen_sessions[<name>] (or never seen) → flag as "new/updated"
   • Read file, summarize:
     • Last-active timestamp
     • Scope (1 line)
     • Any Open questions tagged @<current-session> → highlight these prominently
     • Top 3 entries under "Next steps" / "Touched files"
5. Update _active.json: set sessions.<current>.last_seen_shared = now, and sessions.<current>.last_seen_sessions[<other>] = now for each one shown.

Output format

📋 Sync check für Session: <current-name>

═══ Shared Context (updated X min ago) ═══
<relevant diff, or "nichts Neues">

═══ Andere Sessions ═══
▸ checkout-redesign (last active 2h ago)
  Scope: Neues Checkout-Flow mit Stripe
  ⚠️  @<current-name>: Brauchst du User-Session im Cookie oder Header?
  Next: Payment-Intent endpoint finalisieren

▸ auth-feature (last active 10min ago, updated since last check)
  ...

═══ Für dich direkt ═══
- checkout-redesign fragt: <question>
- (none)

If no other sessions exist, say: "Du bist die einzige registrierte Session. Leg los."

Remember after this command: user has seen all updates.