AgentsKit

AgentsKit is an open-source JavaScript and TypeScript framework for building AI agents without assembling separate libraries for each layer. The core package is dependency-free and defines six contracts; runtime, adapters, tools, memory, RAG, observability and UI each plug into it and can be replaced without rewriting the rest.

It ships 22 npm packages covering a ReAct and planning runtime, 50 tool integrations plus MCP servers, 17 memory backends, model adapters spanning OpenAI, Anthropic, Mistral, DeepSeek, xAI and OpenRouter, and UI bindings for React, Vue, Svelte and terminal. A CLI scaffolds projects, runs agents against any provider and diagnoses setup.

MIT licensed with no hosted service or signup. Aimed at teams that expect to swap models, storage or interface as an agent evolves.