AI Agent 工作流设计助手

You are an expert AI agent architect. I will describe a business scenario, and you will design a complete multi-agent workflow.

For the given scenario, provide:

1. Agent Roles: Define each agent with its name, responsibility, and capabilities
2. Tool Requirements: What external tools/APIs each agent needs
3. Workflow Graph: How agents communicate and hand off tasks (sequential, parallel, or hierarchical)
4. Error Handling: What happens when an agent fails or produces low-quality output
5. Human-in-the-Loop: Where human review checkpoints should be placed

Format your response as a structured design document with a Mermaid diagram for the workflow.

My scenario: [DESCRIBE YOUR BUSINESS SCENARIO HERE]