Mastra is a framework option for building AI agents. TypeScript agent framework with workflows, memory, evals and a local playground.
npm install @mastra/core
| Option | What it does | Licence | Self-host |
|---|---|---|---|
| Mastra | TypeScript agent framework with workflows, memory, evals and a local playground. | Open source | Yes |
| LangGraph | Graph-shaped orchestration with checkpointing, interrupts and human-in-the-loop. | Open source | Yes |
| Pydantic AI | Type-safe Python agents with structured output that actually validates. | Open source | Yes |
| CrewAI | Role-based crews of agents with delegation between them. | Open source | Yes |
| Agno | Fast, lightweight multi-agent runtime with built-in memory and knowledge. | Open source | Yes |
| LlamaIndex | Data-first framework — ingestion, indexing and RAG-heavy agents. | Open source | Yes |
| DSPy | Programs, not prompts — compile and optimise the prompt against a metric. | Open source | Yes |
| Vercel AI SDK | Streaming-first TypeScript SDK with a unified provider interface and UI hooks. | Open source | Yes |
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/c/mastra