Doppleganger

Description

Prevents duplicate subagent sessions running the same task. Saves tokens and reduces lag—no more "multiple Spidermen" doing the same work.

Doppleganger

One task, one agent. Doppleganger stops duplicate subagent sessions from running the same task. That prevents token overspend, UI lag, and the chaos of five identical "task completed" announcements.

Usage

• The orchestrator already runs a duplicate check before sessions_spawn (see delegate rule); Doppleganger is the named skill for that behavior.
• User says: "prevent duplicate agents", "stop dopplegangers", "why are so many agents doing the same thing?"
• You want a single entry point to check whether a task is already running before spawning.