Unified MCP Server with LangChain and LangGraph
Blog post from Unified.to
Unified’s MCP server integrates with LangChain and LangGraph through the official MCP adapter, exposing more than 67,000 Unified tools as native LangChain tools for AI agents that interact with connected CRM, ATS, HRIS, accounting, ticketing, storage, messaging, and commerce systems. The guide provides Python and TypeScript quickstarts showing how to authenticate with a workspace API key, scope access to an end-customer connection, retrieve available tools, and use them with LangChain agents or LangGraph ToolNodes for multi-step workflows. Available tools vary according to the customer’s connected integration and authorized permissions, while URL parameters can restrict tool access, enforce read-only permissions, and hide sensitive personal data. It recommends retaining workspace API keys on the backend, using per-customer MCP clients in multi-tenant applications to isolate data access, and directly invoking tools for deterministic workflows. The document also identifies separate US and EU endpoints and offers troubleshooting guidance for authentication failures, missing tools, incorrect tool selection, and improperly supplied server options.
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