The Model Context Protocol (MCP) base protocol, rooted in JSON-RPC 2.0, is crucial for reliable client-server communication in apps.The base protocol, as of the latest spec, offers modularity, allowing optional features to be added based on app requirements.It emphasizes separation of concerns, handling core messaging while enabling additional functionalities to be integrated as needed.Core message types within the MCP include requests, responses, and notifications, each following JSON-RPC 2.0 guidelines.Requests initiate actions, responses deliver results or errors, and notifications provide one-way updates.Batching messages for efficiency and defining transports like stdio and Streamable HTTP are key aspects of the MCP base protocol.Lifecycle management ensures proper initialization, operation, and shutdown of MCP connections.Authorization features, including OAuth 2.1 support, provide security options for locking down MCP interactions.The MCP base protocol's TypeScript schema serves as a precise reference, ensuring implementation alignment with the specification.Developer-friendly and lightweight, the MCP base protocol offers flexibility and modularity, making it an attractive choice for various projects.