Coaty is an open-source toolkit written in TypeScript for developing collaborative, decentralized IoT applications using software agents. It delivers a container runtime that hosts agent instances, a discovery and registry service for dynamic resource lookup, and pub/sub communication layers for event distribution. Built-in storage adapters synchronize state across devices, while a flexible data model allows you to extend and share domain objects. Coaty supports multiple transport protocols like MQTT and WebSocket, enabling robust, real-time interoperability between edge, fog, and cloud environments without central points of failure.