mongodb-query-optimizer: Help with MongoDB query optimization and indexing. Use only when the user asks for optimization or performance: "How do I optimize this query?", "How do I…; mongodb-schema-design: MongoDB schema design patterns and anti-patterns. Use when designing data models, reviewing schemas, migrating from SQL, or troubleshooting performance issues…; mongodb-connection: Optimize MongoDB client connection configuration (pools, timeouts, patterns) for any supported driver language. U…