Mastra is an open-source TypeScript framework for building AI applications and agents from prototype through production. It integrates with React, Next.js, Node.js, and standalone server deployments, giving JavaScript and TypeScript teams a unified stack for model access, agents, workflows, context, tools, and production operations.

The framework supports model routing across many providers, autonomous tool-using agents, graph-based workflows, human-in-the-loop pauses, persistent execution state, contextual data and memory, MCP servers, evaluations, and observability. Developers can choose flexible agent reasoning for open-ended tasks or explicit workflow control when execution needs to be deterministic.

Mastra is aimed at teams that want agent infrastructure to feel native to the modern TypeScript ecosystem. It is useful for building web assistants, backend agents, automated business processes, multi-step AI products, and production services where model portability, state management, monitoring, and integration with existing application code all matter.