Design Agent Workflow

Design a LangGraph workflow for ad fraud detection. Define roles for at least three agents (e.g., 'Ad Ingestor', 'Creative Analyzer', 'Policy Analyst', 'Fraud Investigator'). Outline their responsibilities, the states they manage, and the conditional logic for transitions. Describe how A2A Protocol will facilitate their communication and how MCP will enable tool access to a mock ad platform API and a policy database.