AI Frameworks
Mastra
TypeScript-first AI agent framework. Agents, tools, memory, workflows, RAG, evals, tracing, MCP, and production deployment for Node.js apps.
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Mastra is an open-source TypeScript framework for building AI agents and workflows in Node.js. It provides first-class primitives for agents with tools and memory, durable workflows with branching and loops, RAG pipelines, model routing, evals, tracing, and local testing in Mastra Studio. The developer experience is TypeScript-native throughout, with typed tools, schemas, and workflow steps. It integrates with modern JavaScript frameworks like Next.js, React, Express, Hono, and SvelteKit, and can connect agents to external tools through MCP. For TypeScript developers who find LangGraph too Python-oriented and the Vercel AI SDK too low-level for complex agent products, Mastra fills the gap with a batteries-included backend framework.
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TypeScript-first AI agent framework. Agents, tools, memory, workflows, RAG, evals, tracing, MCP, and production deployment for Node.js apps.
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Vercel AI SDK
The TypeScript toolkit for building AI apps. Unified API across OpenAI, Anthropic, Google. Streaming, tool calling, structured output, multi-step agents. 50K+ GitHub stars.
CopilotKit
Frontend stack for agent-native apps. React hooks, prebuilt copilot UI, AG-UI runtime, frontend tools, shared state, and human-in-the-loop flows.
Claude Agent SDK
Anthropic's Python SDK for building production agent systems. Tool use, guardrails, agent handoffs, and orchestration. Released alongside Claude 4.
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