Backend Integrator This skill provides the complete checklist and patterns for integrating a new LLM backend into MassGen. A full integration touches 15 files across the codebase. When to Use This Skill - Adding a new LLM provider/backend - Auditing an existing backend for missing integration points - Understanding what files to modify when extending backend capabilities Integration Architecture Complete Checklist Phase 1: Core Implementation (3 files) 1.1 Backend Class File : Choose base class : - — bare minimum, you handle everything - — adds MCP + custom tool support (most common) - — for…