Elysia is a comprehensive plugin for ElysiaJS, enabling developers to effortlessly build and expose Model Context Protocol (MCP) servers via HTTP. It provides robust features like streamable HTTP transport, stateful session management, and type-safe development with Zod validation. Designed for easy integration, it simplifies the creation of MCP servers for managing tools, resources, prompts, and logging, complete with proper JSON-RPC 2.0 error handling and a modular handler architecture.