The MCP Mediator is a Java-based implementation of the Model Context Protocol (MCP) mediator, facilitating efficient communication and tool execution within the MCP ecosystem. It handles MCP requests and responses, manages tool execution, supports various transport mechanisms, and integrates with the Spring Framework and Spring Boot. The mediator also supports proxying multiple MCP servers and can be extended with request handlers for custom functionality, such as querying Wikipedia, Stack Overflow, or GitHub.