Build MCP servers in Python with structured tools, resources, and prompts exposed to LLMs.

• Supports three server modes: local stdio, HTTP transport, and FastMCP Cloud deployment with module-level server export
• Includes 8 built-in middleware types (timing, caching, rate limiting, error handling, logging) with configurable execution order and custom middleware support
• Provides 4 authentication patterns: token validation (JWTVerifier), external OAuth providers (RemoteAuthProvider), OAuth Proxy for GitHub/Google/Azure/AWS/Discord, and full authorization servers
• Offers background tasks with progress tracking (task=True), agentic sampling with tools (ctx.sample), and context-based elicitation for user input
• Supports 6+ storage backends (memory, disk, Redis, DynamoDB, MongoDB) with Fernet encryption for OAuth tokens and persistent state; prevents 30+ common errors including lifespan misconfiguration, middleware ordering, and resource URI mismatches