mcp-ragchat

<p align="center"> <h1 align="center">mcp-ragchat</h1> <p align="center"> An MCP server that adds RAG-powered AI chat to any website. One command from Claude Code. </p> </p>

<p align="center"> <a href="https://opensource.org/licenses/MIT"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT"></a> <a href="https://nodejs.org/"><img src="https://img.shields.io/badge/node-%3E%3D20-brightgreen.svg" alt="Node.js 20+"></a> <a href="https://www.typescriptlang.org/"><img src="https://img.shields.io/badge/TypeScript-5.0-blue.svg" alt="TypeScript"></a> <a href="https://modelcontextprotocol.io/"><img src="https://img.shields.io/badge/MCP-compatible-8A2BE2.svg" alt="MCP"></a> <a href="https://www.npmjs.com/package/mcp-ragchat"><img src="https://img.shields.io/npm/v/mcp-ragchat.svg" alt="npm"></a> </p>

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Tell Claude Code _"add AI chat to mysite.com"_ and it will crawl your content, build a local vector store, spin up a chat server, and hand you an embed snippet. No cloud infra. No database. Just one API key.

Demo

You:    "Set up AI chat for mybakery.com using this FAQ and menu content"

Claude: I'll set up RAG-powered chat for mybakery.com.

        [1/4] ragchat_setup
              Splitting content into sections...
              Generating embeddings for 12 documents...
              Domain "mybakery.com" configured with 12 documents.

        [2/4] ragchat_test
              Query: "What are your hours?"
              Reply: "We're open Monday-Saturday 7am-6pm, and Sunday 8am-2pm."
              RAG Sources: mybakery.com-3 (0.91), mybakery.com-7 (0.84)
              Latency: 340ms

        [3/4] ragchat_serve
              Chat server running at http://localhost:3456
              POST /chat ready.

        [4/4] ragchat_widget
              Generated embed code. Paste this into your HTML:

              <script src="http://localhost:3456/widget.js"></script>

You:    Done. Live chat on my site in under 60 seconds.

Quick Start

1. Clone and build

git clone https://github.com/gogabrielordonez/mcp-ragchat
cd mcp-ragchat
npm install && npm run build

2. Configure Claude Code (~/.claude/mcp.json)

{
  "mcpServers": {
    "ragchat": {
      "command": "node",
      "args": ["/absolute/path/to/mcp-ragchat/dist/mcp-server.js"],
      "env": {
        "OPENAI_API_KEY": "sk-..."
      }
    }
  }
}

3. Use it

Open Claude Code and say:

"Add AI chat to mysite.com. Here's the content: [paste your markdown]"

Claude handles the rest.

Tools

| Tool | What it does | |------|-------------| | ragchat_setup | Seed a knowledge base from markdown content. Each ## section becomes a searchable document with vector embeddings. | | ragchat_test | Send a test message to verify RAG retrieval and LLM response quality. | | ragchat_serve | Start a local HTTP chat server with CORS and input sanitization. | | ragchat_widget | Generate a self-contained <script> tag -- a floating chat bubble, no dependencies. | | ragchat_status | List all configured domains with document counts and config details. |

How It Works

                        +------------------+
                        |  Your Markdown   |
                        +--------+---------+
                                 |
                          ragchat_setup
                                 |
                    +------------v-------------+
                    |   Local Vector Store      |
                    |   ~/.mcp-ragchat/domains/ |
                    |     vectors.json          |
                    |     config.json           |
                    +------------+-------------+
                                 |
          User Question          |
               |                 |
        +------v------+  +------v------+
        |  Embedding  |  |  Cosine     |
        |  Provider   +->+  Similarity |
        +-------------+  +------+------+
                                |
                         Top 3 chunks
                                |
                    +----------v-----------+
                    |  System Prompt       |
                    |  + RAG Context       |
                    |  + User Message      |
                    +----------+-----------+
                               |
                    +----------v-----------+
                    |     LLM Provider     |
                    +----------+-----------+
                               |
                            Reply

Everything runs locally. No cloud infrastructure. Bring your own API key.

Supported Providers

LLM (chat completions)

| Provider | Env Var | Default Model | |----------|---------|---------------| | OpenAI | OPENAI_API_KEY | gpt-4o-mini | | Anthropic | ANTHROPIC_API_KEY | claude-sonnet-4-5-20250929 | | Google Gemini | GEMINI_API_KEY | gemini-2.0-flash |

Embeddings (vector search)

| Provider | Env Var | Default Model | |----------|---------|---------------| | OpenAI | OPENAI_API_KEY | text-embedding-3-small | | Google Gemini | GEMINI_API_KEY | text-embedding-004 | | AWS Bedrock | AWS_REGION + IAM | amazon.titan-embed-text-v2:0 |

Override defaults with LLM_MODEL and EMBEDDING_MODEL environment variables.

Architecture

~/.mcp-ragchat/domains/
  mysite.com/
    config.json     -- system prompt, settings
    vectors.json    -- documents + embedding vectors

• Vector store -- Local JSON files with cosine similarity search. Zero external dependencies.
• Chat server -- Node.js HTTP server with CORS and input sanitization.
• Widget -- Self-contained <script> tag. No frameworks, no build step.

Contributing

Issues and pull requests are welcome.

• Found a bug? Open an issue
• Want to add a feature? Fork, branch, PR.
• Questions? Start a discussion

Star History


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Enterprise

Need multi-tenancy, security guardrails, audit trails, and managed infrastructure? Check out Supersonic -- the enterprise AI platform built on the same RAG pipeline.

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MIT License -- Gabriel Ordonez