Agent Framework
SDK / library structuring agent loops, tool calls, state.
Claude Agent SDK
Anthropic's official SDK for building production agents on Claude.
used in
9
commercial
free
LangGraph
Graph-based agent orchestration framework from the LangChain team.
used in
5
hybrid
freemium
Mastra
TypeScript-first agent framework with workflows, RAG, memory, evals.
used in
4
open source
free
OpenAI Agents SDK
OpenAI's official SDK with handoffs, tools, guardrails, tracing.
used in
3
commercial
free
AG2
Community-maintained multi-agent conversation framework forked from Microsoft's AutoGen.
used in
0
open source
free
Agno
Python framework and high-performance runtime for building and running multi-agent systems.
used in
0
hybrid
freemium
CrewAI
Role-based multi-agent orchestration framework for building collaborative autonomous agent crews.
used in
0
hybrid
freemium
DSPy
Open-source Python framework for programming, rather than prompting, language models.
used in
0
open source
free
Google ADK
Open-source, code-first toolkit from Google for building, evaluating, and deploying AI agents.
used in
0
hybrid
freemium
Haystack
Open-source Python orchestration framework from deepset for production LLM and RAG applications.
used in
0
hybrid
freemium
LlamaIndex
Data framework for connecting LLMs to private data, with RAG, agents, and event-driven workflows.
used in
0
hybrid
freemium
Pydantic AI
Type-safe Python agent framework built by the Pydantic team around validated structured outputs.
used in
0
open source
free
Semantic Kernel
Microsoft's open-source SDK for embedding LLM agents and plugins into .NET, Python, and Java apps.
used in
0
open source
free
smolagents
Hugging Face's minimalist agent library where agents act by writing and running code.
used in
0
open source
free
Strands Agents
Open-source, model-driven SDK from AWS for building AI agents in a few lines of code.
used in
0
hybrid
freemium
Vercel AI SDK
Free, open-source TypeScript toolkit from Vercel for building AI-powered apps and agents.
used in
0
open source
free