Agent Frameworks for AI agents

Libraries for building agents and multi-agent workflows. 6 tools, each link checked.

6 tools6 open source15 comparisonsChecked Oct 16, 2026Read the guide

Mastra
mastra.ai

TypeScript framework for agents with memory, tools, MCP, and workflows.
Agent FrameworksOpen sourceNew
Vercel AI SDK
ai-sdk.dev

Unified TypeScript SDK for AI apps and agents across model providers.
Agent FrameworksOpen sourceNew
OpenAI Agents SDK
openai.github.io

OpenAI's lightweight Python framework for multi-agent workflows.
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LangGraph
langchain.com

Agent orchestration framework with durable execution and human-in-the-loop.
Agent FrameworksOpen sourceNew
CrewAI
crewai.com

Framework and platform for multi-agent teams.
Agent FrameworksOpen sourceNew
Pydantic AI
pydantic.dev

Type-safe Python agent framework from the Pydantic team.
Agent FrameworksOpen sourceNew