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mcp/harbor
LangChain

open primitive for LangChain

io.github.writesdavid/open-primitive

33 tools, 30 US federal data domains. Ed25519 signed, provenance chains, entity graph. Free.

client:LangChain transport:stdio runtime:npm

Install open primitive in LangChain

pip install langchain-mcp-adapters 

from langchain_mcp_adapters.client import MultiServerMCPClient

client = MultiServerMCPClient({
        "open-primitive": {
            "transport": "stdio",
            "command": "npx",
            "args": ["-y", "open-primitive-mcp"],
        }
})

tools = await client.get_tools()

get_tools() returns the server's tools as LangChain tools, ready for an agent. LangChain docs

open primitive in other clients

open primitive MCP server