Agentica

Agentica is an open source TypeScript framework from Wrtn Labs for building AI agents around function calling. Instead of writing agent logic, developers list the functions an agent may use and the framework turns them into a conversational agent that selects and calls them in response to natural language requests. It is designed for TypeScript and backend developers who already expose functionality through code or APIs. Functions can come from three sources: TypeScript classes, Swagger or OpenAPI documents, and MCP servers. The framework generates the schemas that describe those functions to the model from the code itself, so a shopping backend, a file system or a news API can become an agent with little extra code. A setup wizard scaffolds a Node.js agent server, a NestJS agent server, a React client or a standalone application, and every option except standalone uses a WebSocket protocol for client and server communication. Embedded controllers are available for services such as Google Calendar, Google News, GitHub, Reddit and Slack, and the framework works with OpenAI and Google Gemini models. An interactive playground lets developers try TypeScript class, OpenAPI and ecommerce examples before installing. Agentica is released under the MIT license and is free to use. There is no paid tier; costs come from the language model provider you connect. The project website sits behind a bot challenge, so the GitHub repository and its documentation links are the most reliable entry point.