Knock Agent Toolkit is a comprehensive suite of tools designed to facilitate the creation of AI agents that communicate with users through various channels, such as in-app, email, push, SMS, and chat apps, while adhering to predefined messaging workflows and templates. The toolkit supports human-in-the-loop processes, allowing agents to seek human input and approvals before proceeding, thereby ensuring accuracy and compliance with brand guidelines. Knock also introduces an MCP server that integrates with major agent frameworks and SDKs, enabling function calls and resource management across environments. The toolkit emphasizes security and observability, allowing users to control access to resources and monitor cross-channel engagement data. With its ability to streamline communication and enhance agent capabilities, Knock aims to redefine how agents and humans collaborate effectively.