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Best Anthropic Agent SDK Alternatives

169 frameworks you can use instead of Anthropic Agent SDK. Ranked by popularity, tag overlap, and live GitHub signals.

anthropicclaudemcptool-usepythonagents
A

Anthropic Agent SDK

Reference

Claude-native agent framework with built-in MCP and tool use — 4.6K stars

3.8K2.5M/w2d ago67
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Top Alternatives to Anthropic Agent SDK

E

Easy Agent Core

Lightweight AI agent framework with session orchestration and MCP support

OSSFree
Vietor
4 shared tags
F

FastMCP

Fast, Pythonic framework for building Model Context Protocol servers and clients

OSSFree
Prefect
4 shared tags
f

fastmcp

Pythonic framework for building MCP servers and clients with minimal boilerplate

OSSFree
Prefect
4 shared tags
I

IronEngine

Unified orchestration platform with multi-phase planning, 24-category tools, and adaptive model switching

OSSFree
Independent Research
4 shared tags
N

NanoBot

Ultra-lightweight self-hosted AI agent framework with 46k+ stars

OSSFree
HKUDS
4 shared tags
R

RAGFlow

Open-source RAG engine with agent capabilities, GraphRAG, and MCP integration

OSSFree
InfiniFlow
4 shared tags
T

ToolRosetta

Automated tool standardization framework bridging open-source repos with LLM agents via MCP

OSSFree
Research (Shimin Di et al.)
4 shared tags
V

VISUALSKILL

Hierarchical skill library for GUI automation with reusable multimodal interaction patterns

OSSFree
Research Team (Jiang et al.)
4 shared tags
A

Agno

Build, run, and manage agentic software at scale with 38K+ stars

OSSFree
Agno AGI
41.7Ktoday443
3 shared tags
H

Haystack

End-to-end LLM framework for building NLP and agent pipelines — 18K+ stars

OSSFree
deepset
26.2K600.0K/wtoday410
3 shared tags
O

OpenAI Agents SDK

OpenAI's official Python SDK for building multi-agent systems — 19K+ stars

OSSFree
OpenAI
28.7Ktoday350
3 shared tags
F

FastMCP

The fast, Pythonic way to build MCP servers — 24K+ stars

OSSFree
Prefect
27.2K2d ago276
3 shared tags

Compare directly

Anthropic Agent SDK vs Easy Agent CoreAnthropic Agent SDK vs FastMCPAnthropic Agent SDK vs fastmcpAnthropic Agent SDK vs IronEngine