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document-chat

README.md

Document Chat

A chat interface for interacting with documents through the Document Engine MCP server using LangGraph and Next.js.

Overview

Document Chat is a monorepo application that provides a conversational interface for interacting with documents. It consists of two main components:

  • Agents: A LangGraph-powered agent that connects to the Document Engine MCP server to provide document-related functionality
  • Web: A Next.js web application that provides a user interface for chatting with the agent

Prerequisites

  • Node.js v20 or later
  • pnpm v10 or later
  • Document Engine MCP server running (locally or remotely)
  • API keys for the required services (see Environment Variables)

Environment Variables

Create a .env file in the root directory with the following variables:

# Required API keys
OPENAI_API_KEY=""  # Required for the LLM
MCP_SERVER_URL="http://localhost:5100/mcp"  # URL to your Document Engine MCP server

Installation

# Install dependencies
pnpm install

Development

# Start both the web and agents applications in development mode
pnpm dev

# Start only the web application
pnpm turbo dev --filter=web

# Start only the agents application
pnpm turbo dev --filter=agents

The web application will be available at http://localhost:3000 and the LangGraph agent will be available at http://localhost:2024.

Building for Production

# Build all applications
pnpm build

# Build only the web application
pnpm turbo build --filter=web

# Build only the agents application
pnpm turbo build --filter=agents

Architecture

Agents Application

The agents application uses LangGraph to create a conversational agent that can interact with documents through the Document Engine MCP server. The agent uses:

  • OpenAI's GPT-4.1-mini model (configurable)
  • LangGraph for agent orchestration
  • Document Engine MCP client for document-related tools

Web Application

The web application provides a user interface for chatting with the agent. It uses:

  • Next.js for the web framework
  • React for the UI
  • TailwindCSS for styling
  • LangGraph SDK for connecting to the agent

Customization

You can customize the agent by modifying the following files:

  • apps/agents/src/react-agent/graph.ts: The main agent graph
  • apps/agents/src/react-agent/configuration.ts: Agent configuration

License

See the LICENSE file in the root directory.