LangGraph-MAS4SE is designed as a collaborative ecosystem of intelligent agents, each specialized in distinct software engineering phases. At its core, a graph-based message bus orchestrates workflows, allowing agents to publish and subscribe to task-specific data nodes. For example, a code synthesis agent generates initial code drafts, which are then passed to a static analysis agent for quality checks. A documentation agent produces user guides based on analyzed modules, while a testing agent auto-generates unit tests. The system supports plugin interfaces for custom agent development, enabling teams to integrate domain-specific logic. By abstracting complex dependency management and leveraging LLM-driven reasoning, LangGraph-MAS4SE accelerates development cycles, reduces manual overhead, and ensures consistent code quality across large projects.