Built-in Agent
CopilotKit's no-external-process agent backend — runs the agent loop in-process via the runtime, no separate framework or service required.
The Built-in Agent is the simplest agent backend CopilotKit ships. Instead of proxying to an external framework process (LangGraph, Mastra, etc.), it instantiates BuiltInAgent({ model, tools, prompt }) inside your runtime and runs the agent loop in-process. No separate agent server, no external framework install — direct connection to OpenAI / Anthropic / Google or any AI-SDK model with full support for tools, generative UI, and shared state.
For the full BIA-scoped guides — quickstart, server tools, MCP servers, model selection, advanced configuration — see /built-in-agent.
