LangGraph
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.
- Agent framework (code)
- Open source
- MCP
Free tier + paid · 44,183 stars
Agent framework (code)
CrewAI
Agent framework from CrewAI. Supports MCP servers.
Checked 2026-10-31
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CrewAI is an MIT-licensed Python framework for teams of cooperating agents, with MCP support, plus a hosted product called AMP. Our notes from 31 October 2026 record the AMP Basic plan as free for 50 executions a month, and we did not confirm the mid-tier plan. The library is free; model calls are paid to your provider. We would suggest it to developers who think in roles and tasks and want a framework that expresses a crew as a configuration, with a commercial path when they want hosting. Several details are open in our written page: which model providers are supported, the default memory store, native MCP behaviour, how to turn off base telemetry, and seat counts on AMP. That telemetry question matters for private data. Our CrewAI guide has the install steps and a comparison with LangGraph. This entry rests on vendor docs and a README read, not our own build.
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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 CrewAI cost?
Pricing: Free tier + paid, checked 31 October 2026.
Is CrewAI open source?
Yes, under the MIT licence. The code is at github.com/crewAIInc/crewAI.
Does CrewAI 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
