Mastra

Mastra packs agents, graph-based workflows, RAG, memory, evals, and observability into one TypeScript framework, created by the team that previously built Gatsby. Workflows compose with .then, .branch, and .parallel primitives and support suspend and resume with state persistence for human-in-the-loop steps, while the built-in model router connects to more than 40 providers including OpenAI, Anthropic, and Gemini through a single interface. Context management spans conversation history, retrieval, and observational memory, MCP servers plug in as tool sources, and bundled evals plus tracing cover measurement in both development and production. The local development experience centers on Mastra Studio, a playground served at localhost:4111, and a new project is one npm create mastra@latest command away. Core framework code is Apache-2.0, while enterprise features live in separate ee directories under a commercial Mastra Enterprise License, making it an open core project. At roughly 26.7k stars and more than 17,000 commits it leads the TypeScript agent framework field, with documentation at mastra.ai/docs.