Mastra

Mastra is an open-source TypeScript-native framework for building AI agents, designed specifically for the JavaScript/TypeScript ecosystem. While most AI agent frameworks are Python-first, Mastra provides first-class TypeScript support with full type safety, making it the go-to choice for teams building agents in Node.js, Next.js, and other JavaScript environments.

The framework provides a comprehensive set of primitives for agent development: LLM integration with multiple providers (OpenAI, Anthropic, Google), tool definition with typed schemas, workflow orchestration with step-based pipelines, RAG with vector store integration, and persistent memory management. All of these are designed with TypeScript's type system, providing autocompletion, compile-time checks, and excellent developer experience.

Mastra's workflow engine supports sequential, parallel, and conditional execution patterns with built-in error handling and retries. Workflows can include human-in-the-loop steps where execution pauses for user input. The framework also provides syncing integrations with third-party APIs, making it easy to give agents access to external services.

For RAG applications, Mastra includes document processing, chunking, embedding, and vector store integration with Pinecone, pgvector, and other providers. The memory system supports both short-term conversation context and long-term persistent memory with configurable backends.

Mastra includes a development dashboard for testing agents interactively, inspecting tool calls, and debugging workflows. The framework deploys naturally to Vercel, Cloudflare Workers, AWS Lambda, and any Node.js hosting environment. With growing adoption in the TypeScript community, Mastra fills an important gap in the agent framework landscape.