Claude Code plugin: routes subagents by how well-defined the brief is, verifies dev work on a second model in the agent's own clone, and estimates savings against Opus 5.5. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MdqPWvuDpbpRvDEdURoAwo