Agent frameworks

13 tools, checked 2026-10-14.

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LangChain

Agent frameworksOpen source

The most widely used LLM framework; huge ecosystem, sometimes heavy abstractions.

LLM apps · agents · RAG

LangGraph

Agent frameworksOpen source

Graph-based control for agents that need reliability and state.

stateful agents · multi-agent graphs

CrewAI

Agent frameworksOpen source

Role-based multi-agent crews; quick to start.

multi-agent teams

AutoGen

Agent frameworksOpen source

Microsoft's multi-agent framework; research-flavored.

multi-agent conversation

LlamaIndex

Agent frameworksOpen source

Best known for data/RAG pipelines over your documents.

RAG · document agents

OpenAI Agents SDK

Agent frameworksOpen source

Lightweight official SDK; minimal abstractions.

agents · handoffs · tool use

Mastra

Agent frameworksOpen source

TypeScript-first agent framework; good fit for JS builders.

TypeScript agents · workflows

Pydantic AI

Agent frameworksOpen source

Type-safe Python agents from the Pydantic team.

typed Python agents

Vercel AI SDK

Agent frameworksOpen source

The go-to TS toolkit for streaming AI into web apps.

TypeScript LLM apps · streaming UI

smolagents

Agent frameworksOpen source

Hugging Face's tiny agent library; easy to read end to end.

code agents · minimal

Model Context Protocol

Agent frameworksOpen source

The standard for plugging tools into agents; learn it regardless of stack.

tool integration standard

n8n

Agent frameworksFreemium

Visual automation with AI nodes; self-hostable.

workflow automation · AI agents

Dify

Agent frameworksFreemium

Open-source visual LLM app platform; fast internal tools.

LLM app builder · RAG