One and two players

Transport v1 provides the selected player count, but a hit does not identify a weapon or player. Turn ownership is a game rule.

Declare support

"players": {
  "supported_counts": [1, 2],
  "default_count": 1,
  "session_modes": ["single", "versus"],
  "same_screen": true
}

Launcher passes the effective value in Manifest.Session.PlayerCount and session.start. The SDK rejects unsupported selections.

Every hit switches the active player.

Player A completes a series, then player B.

Both players build one aggregate result.

Do not infer a weapon. target.hit has no player_id or weapon_id. Shooter identification requires a separately versioned Launcher extension.

The base completion result is aggregate. Per-player arrays require an agreed protocol extension.