--- title: "MCP SDKs and frameworks: vendor list | Agent MCP Directory" description: "SDKs and frameworks: 8 MCP vendors read on 5 November 2026, each with dated facts, prices and standards. Two checks on each domain." canonical: https://agentmcpdirectory.com/vendors/by-type/sdk-or-framework site: "Agent MCP Directory" last_updated: 2026-11-05 section: "Vendors" --- # MCP SDKs and frameworks: vendor list | Agent MCP Directory > SDKs and frameworks: 8 MCP vendors read on 5 November 2026, each with dated facts, prices and standards. Two checks on each domain. Source: https://agentmcpdirectory.com/vendors/by-type/sdk-or-framework Site: Agent MCP Directory Last reviewed: 2026-11-05 # SDKs and frameworks Vendors of libraries and frameworks for building MCP servers and clients. 8 vendors typed here by main layer, each read on its own pages on 5 November 2026 and listed A to Z: FastMCP and FastMCP Gateway, LangChain, Mastra, MCP official SDKs, Pydantic AI, Spring AI, Stainless and xmcp. Of these, 4 state at least one standard on the pages read, and 8 publish a price for at least one product. Other layers they also cover: host or runtime (1) and gateway or proxy (1). ## SDKs and frameworks | Vendor | Type | What it does for this layer | Standards stated | Pricing | Ora score | Cloudflare scan | Last read | | --- | --- | --- | --- | --- | --- | --- | --- | | FastMCP and FastMCP Gateway | SDK or framework also host or runtime, gateway or proxy | FastMCP is Prefect's open-source Python framework for MCP servers, clients and apps, and FastMCP Gateway is Prefect's commercial service that hosts and governs FastMCP servers from a git push. | 1 supported MCP | open source, Apache-2.0; free start, paid plans as of 2026-11-05 | 63 (C) scanned 2026-09-07 | 53 L4 Agent-Integrated, 2026-11-05 | 2026-11-05 | | LangChain | SDK or framework | LangChain connects its agents to MCP servers through MCPAdapter, built on FastMCP, which discovers a server's tools and adapts them into LangChain tools; the older langchain-mcp-adapters package remains on GitHub. | none recorded | open source as of 2026-11-05 | 74 (B) scanned 2026-10-17 | 7 L0 Not Ready, 2026-11-05 | 2026-11-05 | | Mastra | SDK or framework | Mastra is an open-source TypeScript agent framework whose @mastra/mcp package provides an MCP client for agents and an MCPServer that exposes Mastra tools and agents to external MCP clients. | none recorded | open source; monthly plus usage as of 2026-11-05 | 78 (B) scanned 2026-11-01 | 33 L1 Basic Web Presence, 2026-11-05 | 2026-11-05 | | MCP official SDKs | SDK or framework | The Model Context Protocol project publishes ten official SDKs, ranked in three tiers by feature completeness, protocol support and maintenance commitment, for building MCP servers and clients. | 1 supported MCP | open source as of 2026-11-05 | 69 (C) scanned 2026-10-16 | 53 L4 Agent-Integrated, 2026-11-05 | 2026-11-05 | | Pydantic AI | SDK or framework | Pydantic AI is a Python agent framework that connects agents to MCP servers through an MCP capability, runs servers locally by default with an opt-in for model providers' native MCP, and can serve agents as MCP servers. | none recorded | open source as of 2026-11-05 | 90 (A) scanned 2026-11-04 | 60 L5 Agent-Native, 2026-11-05 | 2026-11-05 | | Spring AI | SDK or framework | Spring AI builds on the MCP Java SDK with Spring Boot starters for MCP clients and servers, annotation-based tool handling, and the Spring WebFlux and WebMVC transports. | 1 supported MCP | open source as of 2026-11-05 | 58 (C) scanned 2026-04-24 | 20 L1 Basic Web Presence, 2026-11-05 | 2026-11-05 | | Stainless | SDK or framework | Stainless generates an MCP server from an OpenAPI spec as a subpackage of a generated TypeScript SDK, exposing a code execution tool and a docs search tool instead of one tool per endpoint. | 1 supported OpenAPI | per generator as of 2026-11-05 | 58 (C) scanned 2026-09-10 | 20 L1 Basic Web Presence, 2026-11-05 | 2026-11-05 | | xmcp | SDK or framework | xmcp is a TypeScript framework from basement.studio that registers MCP tools, prompts and resources from project files and ships adapters for Next.js and Express plus auth and payment integrations. | none recorded | open source as of 2026-11-05 | 57 (C) scanned 2026-09-16 | 47 L4 Agent-Integrated, 2026-11-05 | 2026-11-05 | ## Typed elsewhere, also covering this layer SDKs and frameworks - [Alpic](https://agentmcpdirectory.com/vendors/alpic/) - [Anthropic](https://agentmcpdirectory.com/vendors/anthropic/) - [Manufact](https://agentmcpdirectory.com/vendors/manufact/) - [OpenAI](https://agentmcpdirectory.com/vendors/openai/) - [Vercel](https://agentmcpdirectory.com/vendors/vercel/) ## The other layers Layers - [Hosts and runtimes](https://agentmcpdirectory.com/vendors/by-type/host/) 10 - [Registries and directories](https://agentmcpdirectory.com/vendors/by-type/registry/) 8 - [Gateways and proxies](https://agentmcpdirectory.com/vendors/by-type/gateway/) 13 - [Auth providers](https://agentmcpdirectory.com/vendors/by-type/auth-provider/) 9 - [Security scanners](https://agentmcpdirectory.com/vendors/by-type/security-scanner/) 6 - [SDKs and frameworks](https://agentmcpdirectory.com/vendors/by-type/sdk-or-framework/) 8 - [Connector platforms](https://agentmcpdirectory.com/vendors/by-type/connector-platform/) 10 Edition 4 November 2026 Method [How rows are verified](https://agentmcpdirectory.com/method/) Data [CSV and JSON](https://agentmcpdirectory.com/data/) Markdown [This page as markdown](https://agentmcpdirectory.com/vendors/by-type/sdk-or-framework/index.md) ## Sources - [FastMCP: The Framework for MCP - FastMCP](https://gofastmcp.com/), read 5 November 2026 - [Model Context Protocol (MCP) - Docs by LangChain](https://docs.langchain.com/oss/python/langchain/mcp), read 5 November 2026 - [Mastra home](https://mastra.ai/), read 5 November 2026 - [SDKs - Model Context Protocol](https://modelcontextprotocol.io/docs/sdk), read 5 November 2026 (the project's own page) - [Model Context Protocol (MCP) | Pydantic Docs](https://ai.pydantic.dev/mcp/), read 5 November 2026 - [Model Context Protocol (MCP) :: Spring AI Reference](https://docs.spring.io/spring-ai/reference/api/mcp/mcp-overview.html), read 5 November 2026 - [Stainless - MCP Portal](https://www.stainless.com/mcp), read 5 November 2026 - [xmcp.dev/](https://xmcp.dev/), read 5 November 2026 Last reviewed 5 November 2026