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MCP client - LangChain - verified

How to add an MCP server to LangChain MCP adapters

Where to add MCP servers in LangChain MCP adapters: In code: MCPAdapter(target) from langchain.mcp, where target is a URL, script Path, MCPConfig dict ({"mcpServers": {...}}) or fastmcp.Client. Its docs list support for stdio, Streamable HTTP and SSE. It handles OAuth sign-in for remote servers.

LangChain MCP adapters homepage - LangChain / LangGraph in our tools directory - Compare all MCP clients

Kind
SDK or framework
stdio
Yes
Streamable HTTP
Yes
SSE
Yes

Add a server

Where the config lives
In code: MCPAdapter(target) from langchain.mcp, where target is a URL, script Path, MCPConfig dict ({"mcpServers": {...}}) or fastmcp.Client

The example from the LangChain MCP adapters docs, copied verbatim. Swap in your server's name, command or URL.

Python
from langchain.mcp import MCPAdapter

config = {
    "mcpServers": {
        "math": {"command": "python", "args": ["/path/to/math_server.py"]},
        "weather": {"url": "http://localhost:8000/mcp"},
    }
}
async with MCPAdapter(config) as adapter:
    tools = await adapter.list_tools()

Source: docs.langchain.com/oss/python/migrate/langchain-mcp-adapters

Which server?

Pick a server from the verified directory of official MCP servers. Each one lists its transport, auth and the setup snippets its vendor publishes, so you can match it to what LangChain MCP adapters supports.

MCP support

What the LangChain MCP adapters docs say it supports. Not stated means the docs do not say either way.

LangChain MCP adapters MCP features, transports and OAuth, each with its source
FeatureValueSource
ToolsCalls the functions a server exposes.Yesdocs.langchain.com/oss/python/langchain/mcp/tools
ResourcesReads data and files a server exposes as resources.Nodocs.langchain.com/oss/python/migrate/langchain-mcp-adapters
PromptsOffers a server's prompt templates to the user.Nodocs.langchain.com/oss/python/migrate/langchain-mcp-adapters
SamplingLets a server ask the client's model for a completion.Nodocs.langchain.com/oss/python/langchain/mcp/tools
RootsTells a server which directories it may work in.Nodocs.langchain.com/oss/python/langchain/mcp/tools
ElicitationLets a server ask the user for input mid-task.Yesdocs.langchain.com/oss/python/langchain/mcp/tools
DiscoveryPicks up tools, prompts or resources a server adds or removes while connected.Not statedDocs do not say
InstructionsUses the instructions a server sends when it connects.Not statedDocs do not say
stdioStarts a local server as a subprocess.Yesdocs.langchain.com/oss/python/langchain/mcp
Streamable HTTPConnects to a remote server over the current HTTP transport.Yesdocs.langchain.com/oss/python/langchain/mcp
SSEConnects over the older HTTP+SSE transport.Yesdocs.langchain.com/oss/python/migrate/langchain-mcp-adapters
OAuthSigns in to remote servers with OAuth.Yesdocs.langchain.com/oss/python/langchain/mcp/auth

Worth knowing

The standalone langchain-mcp-adapters package is replaced by the beta langchain.mcp namespace (langchain[mcp]>=1.4.0, built on FastMCP), which wraps tools only; prompts and resources must be read through the FastMCP client directly.

Other SDKs and frameworks

FAQ

Where is the LangChain MCP adapters MCP config?

In code: MCPAdapter(target) from langchain.mcp, where target is a URL, script Path, MCPConfig dict ({"mcpServers": {...}}) or fastmcp.Client. The example on this page is copied from https://docs.langchain.com/oss/python/migrate/langchain-mcp-adapters

Does LangChain MCP adapters support remote MCP servers over Streamable HTTP?

Yes, per https://docs.langchain.com/oss/python/langchain/mcp. Its docs list support for stdio, Streamable HTTP and SSE.

Does LangChain MCP adapters support OAuth for MCP servers?

Yes. It handles OAuth sign-in for remote servers. Source: https://docs.langchain.com/oss/python/langchain/mcp/auth

Which MCP features does LangChain MCP adapters support?

Its docs list Tools and Elicitation. They say Resources, Prompts, Sampling and Roots are not supported. They do not state Discovery and Instructions.

Sources

Last verified from the pages below.

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