Show HN: Cross-Claude MCP – Let multiple Claude instances talk to each other (github.com)

The Cross-Claude MCP server has been introduced to facilitate communication between multiple Claude instances via a shared message bus. This innovative tool allows users to register distinct identities for each instance—such as "builder" and "reviewer"—and interact through named channels, akin to a lightweight version of Slack specifically designed for Claude sessions. Key features include message storage in a database, automatic detection of environment settings, and straightforward deployment options, making it accessible for both individual users and teams working on collaborative projects. This development is significant for the AI/ML community as it enhances collaborative capabilities among AI models, allowing for more streamlined workflows. By incorporating tools like `send_message`, `check_messages`, and `share_data`, users can efficiently handle tasks and share large datasets without cluttering their communication. The architecture supports local development with SQLite or remote deployment with PostgreSQL, broadening its applicability. With its straightforward setup and robust functionality, Cross-Claude MCP represents a step forward in enabling AI models to work together seamlessly, thus augmenting productivity and interactivity in AI projects.