Koog is a JetBrains-backed framework for creating AI agents in idiomatic Kotlin and Java. It provides multi-platform deployment options spanning JVM, JS, WasmJS, Android, and iOS. The framework emphasizes reliability and fault-tolerance for enterprise deployments, with built-in support for major LLM providers including OpenAI, Anthropic, and Ollama, as well as MCP protocol integration for tool-based interactions and multi-agent orchestration.