# Mastra

> An open-source TypeScript framework for building AI agents, workflows, RAG, and tool-calling, with memory, model routing, and built-in observability.

Mastra is an open-source TypeScript framework for building AI agents, workflows, RAG, and tool-calling, from the team behind Gatsby. It targets JavaScript/TypeScript engineers who want typed agents, graph-based workflows, memory, and observability in one stack instead of dropping to Python.

Website: https://mastra.ai

Mastra is an **open-source TypeScript framework for building AI agents, workflows, RAG, and tool-calling**, from the team behind Gatsby (Sam Bhagwat and co-founders). It packages the primitives an agentic app needs — typed agents, a graph-based workflow engine, agent memory, model routing, and observability — into one modular framework so you stay in TypeScript instead of reaching for a separate Python stack.

It is aimed at JavaScript/TypeScript engineers building production agents and AI features: you define an agent with instructions, a model, and tools in one place, then compose deterministic multi-step workflows around it. That makes it a natural fit when your app, your tooling, and your AI logic all live in the same Node/TypeScript codebase.

## Highlights

- **Typed agents** — declare instructions, model, tools, and runtime behavior in a single typed object; the agent reasons over tools and iterates until it returns a final answer.
- **Graph-based workflows** — orchestrate multi-step processes with explicit control flow via `.then()`, `.branch()`, and `.parallel()`, separate from open-ended agent loops.
- **Memory and RAG** — built-in conversation history plus semantic/retrieval memory for grounding agents in your own data.
- **Model routing and observability** — connect to many model providers through one interface, with built-in scorers and tracing to measure and refine agent behavior.

## In an AI-assisted workflow

Scaffold a project, define an agent, and call it from your TypeScript app. See where it sits among peers in [Agent Frameworks in 2026](/guides/concepts/agent-frameworks-2026).

```bash
npm create mastra@latest
# then, in code:
# import { Agent } from "@mastra/core/agent";
# const agent = new Agent({ name: "support", instructions: "...", model, tools });
# const res = await agent.generate("Summarize this ticket");
```

> [!TIP]
> Reach for Mastra when your stack is already TypeScript and you want agents, workflows, memory, and tracing in one framework — rather than splitting agent logic into a separate Python service.

## Good to know

Mastra's core framework is open source under Apache-2.0 and free to self-host; code under `ee/` directories is source-available under the Mastra Enterprise License, and the hosted Mastra Platform is a separate commercial offering with a free Starter tier and paid usage-based tiers. Confirm current pricing and license terms on the official site. For broader framework trade-offs, see [LangGraph vs. CrewAI](/guides/comparisons/langgraph-vs-crewai).

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_Source: https://agentscamp.com/tools/mastra — Tool on AgentsCamp._