CrewAI
CrewAI is an MIT-licensed Python framework for teams of cooperating agents, with MCP support, plus a hosted product called AMP.
- Agent framework (code)
- Open source
- MCP
Free tier + paid · 60,313 stars
Agent framework (code)
LangGraph
Agent framework from LangChain. Supports MCP servers.
Checked 2026-10-31
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LangGraph is an MIT-licensed framework from LangChain for building agents as graphs with state, with MCP support through an adapter we could not confirm in detail. The library is free. LangChain's hosted tracing and deployment product, LangSmith, listed a Developer plan at $0 and a Plus plan at $39 per seat per month in our 31 October 2026 notes, so the realistic cost of production use lies in that platform plus model calls. We would suggest it to developers who need explicit control over flow, such as loops, branches, retries and human approval steps, and who accept more setup than a crew-style framework needs. The open items in our written page are the supported Python versions and the status of the MCP adapter. The main limit is the learning curve of graph thinking for simple jobs, where a smaller SDK may be enough. Our guide compares it with CrewAI and the vendor SDKs. We read docs and pricing, and have not built with it ourselves.
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Pydantic AI
Pydantic AI is an MIT-licensed Python agent framework from the team behind Pydantic.
- Agent framework (code)
- Open source
- MCP
Free · 20,962 stars
Agent Development Kit (ADK)
Agent Development Kit, or ADK, is Google's open-source, code-first framework for building, evaluating and deploying agents.
- Agent framework (code)
- Open source
- MCP
Free · 22,051 stars
OpenAI Agents SDK
The OpenAI Agents SDK is an MIT-licensed Python framework for multi-agent workflows, with a JavaScript and TypeScript version alongside.
- Agent framework (code)
- Open source
- MCP
Free · 30,399 stars
Claude Agent SDK
The Claude Agent SDK is Anthropic's library for building agents on the same loop that powers Claude Code.
- Agent framework (code)
- Open source
- MCP
Free · 8,394 stars
Mastra
Mastra is a TypeScript agent framework with MCP support.
- Agent framework (code)
- MCP
Free tier + paid · 29,218 stars
AI Agent Frameworks: Twelve Compared for Developers
Checked 2026-10-31
Agentic AI Frameworks: Patterns and Which Tool Fits
Checked 2026-10-31
Questions
How much does LangGraph cost?
Pricing: Free tier + paid, checked 31 October 2026.
Is LangGraph open source?
Yes, under the MIT licence. The code is at github.com/langchain-ai/langgraph.
Does LangGraph work with MCP servers?
Yes.
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Alternatives
AutoGen
AutoGen is Microsoft's framework for multi-agent applications, and its repository now carries an archived notice: Microsoft says it is not providing bug fixes, security fixes, new features or support, and tells new users to start with Microsoft Agent Framework, described as the production-ready successor with stable APIs.
- Agent framework (code)
- MCP
Free · 61,642 stars
