Mastra

What is Mastra?

Mastra is a TypeScript-first framework for building AI-powered applications and agents. Created by the team behind Gatsby, it provides a complete toolkit for developing everything from early prototypes to production-ready AI systems. Mastra includes built-in support for workflows, memory, streaming, evals, tracing, and Studio—an interactive UI for development and testing. You can start building immediately with npm create mastra@latest.

Who it's for

• TypeScript developers who want a purpose-built framework for AI application development without juggling multiple libraries.
• AI engineers building autonomous agents that need reliable context management, human-in-the-loop capabilities, and production observability.
• Full-stack teams integrating AI into existing React, Next.js, or Node.js applications, or deploying standalone AI servers.

Key features

Agents and workflows

Build autonomous agents that reason about goals, select tools, and iterate internally until they produce a final answer. When you need explicit control, Mastra's graph-based workflow engine lets you orchestrate complex multi-step processes with intuitive syntax for .then(), .branch(), and .parallel() execution.

Model routing and integrations

Connect to 40+ AI providers through a single standard interface, including OpenAI, Anthropic, and Gemini. Bundle agents and workflows into existing frontend or backend frameworks, or deploy them as standalone endpoints. Mastra also supports MCP servers for exposing agents and tools via the Model Context Protocol.

Context management and human-in-the-loop

Give agents the right context at the right time using conversation history, external data sources, and semantic memory. Suspend agents or workflows to await user input or approval before resuming—Mastra preserves execution state so you can pause indefinitely and pick up where you left off.

Production essentials

Ship reliable agents with built-in evals and observability tools. Mastra provides everything you need to observe, measure, and refine your AI applications continuously, from early testing through production deployment.

What stands out

"Mastra gives you everything you need to build great AI applications out-of-the-box."

This isn't just a framework—it's a complete development environment. The Studio UI provides interactive testing and debugging, while the dual-license model (Apache 2.0 for the core framework) means you can freely develop and test enterprise features before committing to a production license. The combination of autonomous agents, explicit workflows, and human-in-the-loop capabilities in a single TypeScript package is rare.

Worth checking out if…

You're building AI-powered applications with TypeScript and want a unified framework that handles agents, workflows, context management, and production monitoring without stitching together disparate tools. Mastra is especially valuable if you need human-in-the-loop capabilities, multi-provider model routing, or seamless integration with React, Next.js, or Node.js.