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mastra-ai

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Mastra is an open-source TypeScript framework for building AI agents, offering agents, workflows, memory, and observability tooling for developers. The company was founded in 2024 by a team previously behind Gatsby, an early modern web framework, and has raised $35 million from investors including Spark Capital, Gradient, and Y Combinator. Mastra is used by engineering teams at companies including Replit, PayPal, and SoftBank.