Merge's blog discusses the use of authentication tools to securely connect AI agents to MCP servers, emphasizing the importance of implementing robust authentication flows to prevent unauthorized access. The article highlights several tools like Merge Agent Handler, Composio, and Arcade, each offering unique features for managing user authentication and tool interactions. Merge Agent Handler uses an embeddable UI component to streamline the authentication process, while Composio provides a configuration-based approach for centralized auth management. Arcade supports multiple authentication methods and ensures security during task execution. Despite the benefits, each tool has its limitations, such as access variability and limited authentication visibility post-setup. The blog underscores the significance of these tools in maintaining security without detracting from the core product development.