Docusaurus Plugin Mcp Server

npm version License

A Docusaurus plugin that exposes an MCP (Model Context Protocol) server endpoint, allowing AI agents like Claude, Cursor, and other MCP-compatible tools to search and retrieve your documentation.

Installation

npm install docusaurus-plugin-mcp-server

Quick Start

1. Add the Plugin

// docusaurus.config.js
module.exports = {
  plugins: [
    [
      'docusaurus-plugin-mcp-server',
      {
        server: {
          name: 'my-docs',
          version: '1.0.0',
        },
      },
    ],
  ],
};

2. Create the API Endpoint

Choose your deployment platform:

import { createVercelHandler } from 'docusaurus-plugin-mcp-server/adapters';
import path from 'path';
import { fileURLToPath } from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

export default createVercelHandler({
  docsPath: path.join(__dirname, '../build/mcp/docs.json'),
  indexPath: path.join(__dirname, '../build/mcp/search-index.json'),
  name: 'my-docs',
  baseUrl: 'https://docs.example.com',
});

{
  "functions": {
    "api/mcp.js": {
      "includeFiles": "build/mcp/**"
    }
  },
  "rewrites": [{ "source": "/mcp", "destination": "/api/mcp" }]
}

import { createNetlifyHandler } from 'docusaurus-plugin-mcp-server/adapters';
import path from 'path';
import { fileURLToPath } from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

export const handler = createNetlifyHandler({
  docsPath: path.join(__dirname, '../../build/mcp/docs.json'),
  indexPath: path.join(__dirname, '../../build/mcp/search-index.json'),
  name: 'my-docs',
  baseUrl: 'https://docs.example.com',
});

[build]
  publish = "build"

[functions]
  directory = "netlify/functions"
  included_files = ["build/mcp/**"]

[[redirects]]
  from = "/mcp"
  to = "/.netlify/functions/mcp"
  status = 200

import { createCloudflareHandler } from 'docusaurus-plugin-mcp-server/adapters';
import docs from '../build/mcp/docs.json';
import searchIndex from '../build/mcp/search-index.json';

export default {
  fetch: createCloudflareHandler({
    docs,
    searchIndexData: searchIndex,
    name: 'my-docs',
    baseUrl: 'https://docs.example.com',
  }),
};

3. Build and Deploy

npm run build
# Deploy to your platform

4. Connect Your AI Tool

Claude Code:

claude mcp add --transport http my-docs https://docs.example.com/mcp

Cursor / VS Code:

{
  "mcpServers": {
    "my-docs": {
      "url": "https://docs.example.com/mcp"
    }
  }
}

5. Add an Install Button (Optional)

Add a dropdown button to your docs site so users can easily install the MCP server in their AI tool:

import { McpInstallButton } from 'docusaurus-plugin-mcp-server/theme';

function NavbarItems() {
  return <McpInstallButton serverUrl="https://docs.example.com/mcp" serverName="my-docs" />;
}

The button shows a dropdown with copy-to-clipboard configurations for all supported MCP clients.

Light Mode	Dark Mode

Props:

MCP Tools

The server exposes two tools for AI agents:

docs_search

Search across documentation with relevance ranking. Returns matching documents with URLs, snippets, and relevance scores.

{
  "name": "docs_search",
  "arguments": {
    "query": "authentication",
    "limit": 16
  }
}

Response includes:

• Full URL for each result (use with docs_fetch)
• Title and relevance score
• Snippet of matching content
• Matching headings

docs_fetch

Retrieve full page content as markdown. Use this after searching to get the complete content of a specific page.

{
  "name": "docs_fetch",
  "arguments": {
    "url": "https://docs.example.com/docs/authentication"
  }
}

Response includes:

• Page title and description
• Table of contents with anchor links
• Full markdown content

Plugin Options

Default Selectors

Content selectors (in priority order):

['article', 'main', '.main-wrapper', '[role="main"]'];

Exclude selectors:

[
  'nav',
  'header',
  'footer',
  'aside',
  '[role="navigation"]',
  '[role="banner"]',
  '[role="contentinfo"]',
];

Custom Providers

The plugin uses a two-phase provider model: indexers run at build time to process documents, and search providers handle queries at runtime. Both are pluggable.

ContentIndexer

Implement ContentIndexer to push documents to an external system during build:

import type { ContentIndexer, ProviderContext, ProcessedDoc } from 'docusaurus-plugin-mcp-server';

export default class AlgoliaIndexer implements ContentIndexer {
  readonly name = 'algolia';

  shouldRun(): boolean {
    return process.env.ALGOLIA_SYNC === 'true';
  }

  async initialize(context: ProviderContext): Promise<void> {
    console.log(`[Algolia] Initializing for ${context.baseUrl}`);
  }

  async indexDocuments(docs: ProcessedDoc[]): Promise<void> {
    // Push docs to Algolia
  }

  async finalize(): Promise<Map<string, unknown>> {
    // No local artifacts needed
    return new Map();
  }
}

SearchProvider

Implement SearchProvider to delegate runtime search to an external service:

import type {
  SearchProvider,
  ProviderContext,
  SearchOptions,
  SearchResult,
} from 'docusaurus-plugin-mcp-server';

export default class GleanSearchProvider implements SearchProvider {
  readonly name = 'glean';

  private apiEndpoint = process.env.GLEAN_API_ENDPOINT!;
  private apiToken = process.env.GLEAN_API_TOKEN!;

  async initialize(context: ProviderContext): Promise<void> {
    if (!this.apiEndpoint || !this.apiToken) {
      throw new Error('GLEAN_API_ENDPOINT and GLEAN_API_TOKEN required');
    }
  }

  isReady(): boolean {
    return !!this.apiEndpoint && !!this.apiToken;
  }

  async search(query: string, options?: SearchOptions): Promise<SearchResult[]> {
    // Call Glean Search API and transform results
    return [];
  }
}

Configuring Custom Providers

// docusaurus.config.js
module.exports = {
  plugins: [
    [
      'docusaurus-plugin-mcp-server',
      {
        // Run both the built-in FlexSearch indexer and a custom one
        indexers: ['flexsearch', './my-algolia-indexer.js'],
        // Use a custom search provider at runtime
        search: '@myorg/glean-search',
      },
    ],
  ],
};

Server Configuration

For the runtime adapters:

*Use either file paths (Node.js) or pre-loaded data (Workers).

Verifying Your Build

After running npm run build, use the included CLI to verify the MCP output:

npx docusaurus-mcp-verify

This checks that:

• All required files exist (docs.json, search-index.json, manifest.json)
• Document structure is valid
• The MCP server can initialize and load the content

You can specify a custom build directory:

npx docusaurus-mcp-verify ./custom-build

Example output:

🔍 MCP Build Verification
==================================================
Build directory: /path/to/your/project/build

📁 Checking build output...
   ✓ Found 42 documents
   ✓ All required files present
   ✓ File structure valid

🚀 Testing MCP server...
   ✓ Server initialized with 42 documents

✅ All checks passed!

Testing the Endpoint

The easiest way to test your MCP server is with the official MCP Inspector:

npx @modelcontextprotocol/inspector

This opens a visual interface where you can:

• Connect to your server URL
• Browse available tools
• Execute tool calls interactively
• View responses in a formatted display

Alternatively, test with curl:

# List available tools
curl -X POST https://docs.example.com/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

# Search documentation
curl -X POST https://docs.example.com/mcp \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc":"2.0",
    "id":2,
    "method":"tools/call",
    "params":{
      "name":"docs_search",
      "arguments":{"query":"getting started"}
    }
  }'

How It Works

The plugin operates in two phases:

Build Time: During docusaurus build, the plugin's postBuild hook processes all rendered HTML pages, extracts content, converts to markdown, builds a FlexSearch index, and outputs artifacts to build/mcp/.

Runtime: A serverless function loads the pre-built artifacts and handles MCP JSON-RPC requests from AI agents. The server is stateless and fast since all indexing happens at build time.

Features

• Full-text Search - FlexSearch-powered search with relevance ranking
• Page Retrieval - Get complete page content as clean markdown
• Platform Adapters - Pre-built adapters for Vercel, Netlify, and Cloudflare Workers
• CORS Support - All adapters include CORS headers for browser-based clients
• Build-time Processing - Extracts content from rendered HTML, capturing React component output
• Zero Runtime Docusaurus Dependency - The MCP server runs independently

Local Development

Run a local MCP server for testing using the built-in Node adapter:

// mcp-server.mjs
import { createNodeServer } from 'docusaurus-plugin-mcp-server/adapters';

createNodeServer({
  docsPath: './build/mcp/docs.json',
  indexPath: './build/mcp/search-index.json',
  name: 'my-docs',
  baseUrl: 'http://localhost:3000',
}).listen(3456, () => {
  console.log('MCP server at http://localhost:3456');
});

The Node adapter handles CORS, preflight requests, and health checks (GET) automatically.

Connect Claude Code:

claude mcp add --transport http my-docs http://localhost:3456

API Reference

Main Exports

import {
  // Docusaurus plugin (default export)
  mcpServerPlugin,

  // MCP Server class
  McpDocsServer,

  // Tool definitions
  docsSearchTool,
  docsFetchTool,

  // Utilities
  htmlToMarkdown,
  extractContent,
  extractHeadingsFromMarkdown,
  buildSearchIndex,

  // Provider types (for custom implementations)
  loadIndexer,
  loadSearchProvider,
  FlexSearchIndexer,
  FlexSearchProvider,

  // Default options
  DEFAULT_OPTIONS,
} from 'docusaurus-plugin-mcp-server';

Adapter Exports

import {
  createVercelHandler,
  createNetlifyHandler,
  createCloudflareHandler,
  createNodeServer,
  createNodeHandler,
  generateAdapterFiles,
} from 'docusaurus-plugin-mcp-server/adapters';

• createNodeServer(options) — Creates a complete Node.js HTTP server for local development. Returns an http.Server ready to .listen().
• createNodeHandler(options) — Creates a request handler function compatible with http.createServer(). Use this when you need to integrate with an existing server.

Theme Exports

import {
  McpInstallButton,
  type McpInstallButtonProps,
  useMcpRegistry,
  createDocsRegistry,
  createDocsRegistryOptions,
  type McpConfig,
} from 'docusaurus-plugin-mcp-server/theme';

• McpInstallButton — Dropdown button for users to install the MCP server in their AI tool.
• useMcpRegistry() — React hook that returns the MCP config registry from plugin global data. Returns undefined if the plugin is not installed.
• createDocsRegistry(config) — Creates a pre-configured MCPConfigRegistry for documentation servers.
• createDocsRegistryOptions(config) — Returns registry options without creating the registry.
• McpConfig — Type for { serverUrl: string; serverName: string }.

Requirements

• Node.js >= 20
• Docusaurus 3.x

License

MIT