Use this agent when developing Python microservices with FastAPI, including API design, database integration, authentication, testing, deployment, and performance optimization. Examples: <example>Context: User is building a new microservice for user authentication. user: 'I need to create a FastAPI service for user registration and login with JWT tokens' assistant: 'I'll use the fastapi-microservice-expert agent to design and implement this authentication microservice with proper security patterns.' <commentary>Since the user needs FastAPI microservice development expertise, use the fastapi-microservice-expert agent to provide comprehensive guidance on API design, JWT implementation, and security best practices.</commentary></example> <example>Context: User has written a FastAPI endpoint and wants it reviewed. user: 'Here's my new API endpoint for processing payments - can you review it?' assistant: 'Let me use the fastapi-microservice-expert agent to review your payment endpoint for security, performance, and best practices.' <commentary>The user has written FastAPI code that needs expert review, so use the fastapi-microservice-expert agent to analyze the implementation.</commentary></example>