Mastra

Package

TypeScript framework for AI agents, workflows, memory and RAG

Price: Free, open source; paid cloud plans
Access: LLM provider API key

About

Mastra is an Apache-2.0 TypeScript framework for agents, graph workflows, memory, RAG and evals, with a model router for 40+ providers. It runs in Node.js, React or Next.js apps; the hosted Mastra platform adds observability and deployment.

What you can do with it

Build a TypeScript agent with tools and memory in a Node.js app
Chain LLM steps into workflows with branching, suspend and resume
Expose your agents and tools as an MCP server

Get started

Install @mastra/core and zod, or run npm create mastra@latest
Set your model provider's API key, e.g. OPENAI_API_KEY

Example

import { Agent } from "@mastra/core/agent";

const agent = new Agent({
  id: "assistant",
  name: "Assistant",
  instructions: "You are a helpful assistant.",
  model: "openai/gpt-5.6-sol",
});
const response = await agent.generate("Help me organize my day");
console.log(response.text);

Details

Hosting: Hosted service, Runs locally
Available in: Worldwide
Official SDKs: JavaScript/TypeScript
MCP server: None