Mastra is an open-source TypeScript framework for building AI agents and workflows - agents that call tools, keep memory, and run multi-step tasks over hours or days. Its site highlights long-running agents and reports roughly 29k GitHub stars, with Salesforce, Marsh, Sanity, SoftBank, WorkOS, and Brex shown as companies using it (vendor figures and logos; verify independently before relying on them).
Because it is ordinary TypeScript, a team already on Node can prototype an agent in a day and deploy it alongside the rest of the stack instead of adopting a separate Python toolchain.
