@gongrzhe/langflow-doc-qa-server v1.0.2

Langflow-DOC-QA-SERVER

A Model Context Protocol server for document Q&A powered by Langflow

This is a TypeScript-based MCP server that implements a document Q&A system. It demonstrates core MCP concepts by providing a simple interface to query documents through a Langflow backend.

Prerequisites

1. Create Langflow Document Q&A Flow

1. Open Langflow and create a new flow from the "Document Q&A" template
2. Configure your flow with necessary components (ChatInput, File Upload, LLM, etc.)
3. Save your flow

2. Get Flow API Endpoint

1. Click the "API" button in the top right corner of Langflow
2. Copy the API endpoint URL from the cURL command Example: http://127.0.0.1:7860/api/v1/run/<flow-id>?stream=false
3. Save this URL as it will be needed for the configuration

Features

Tools

• query_docs - Query the document Q&A system
  • Takes a query string as input
  • Returns responses from the Langflow backend

Installation

Option 1: Install from NPM

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "langflow-doc-qa": {
      "command": "npx",
      "args": [
        "@gongrzhe/langflow-doc-qa-server@1.0.0",
        "http://127.0.0.1:7860/api/v1/run/<your-flow-id>"
      ]
    }
  }
}

Option 2: Build from Source

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Then add the server config:

{
  "mcpServers": {
    "langflow-doc-qa": {
      "command": "node",
      "args": [
        "/path/to/doc-qa-server/build/index.js",
        "http://127.0.0.1:7860/api/v1/run/<your-flow-id>"
      ]
    }
  }
}

Environment Variables

The server supports the following environment variables for configuration:

• API_ENDPOINT: The endpoint URL for the Langflow API service. Can also be provided as the first command line argument.

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.