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 framework (code)
Mastra
Agent framework from Mastra. Supports MCP servers.
Checked 2026-10-31
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Mastra is a TypeScript agent framework with MCP support. Its core is described on mastra.ai/pricing as free and Apache 2.0 licensed, for building and hosting agents anywhere, and a hosted cloud sits beside it. On 31 October 2026 the cloud Starter plan was $0 a month with 100,000 observability events and 24 CPU hours, then metered, while Teams was $250 a month with 1 million events and 250 CPU hours, six months of data retention, multiple teams, SSO and a SOC 2 report on request. We would suggest it to JavaScript and TypeScript teams who want an agent framework in their own language and a hosted option for tracing and deployment. The main limit is language fit: if your stack is Python, the Python frameworks in our list are the closer match, and the metered cloud rates mean a busy deployment needs a cost check. Our data lists the licence as other, so read the repository file. This is a documentation read, not a build.
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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
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 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
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 Mastra cost?
Pricing: Free tier + paid, checked 31 October 2026.
Is Mastra open source?
No, it is other.
Does Mastra 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
