rsbuild-plugin-mcp

Rsbuild plugin that enables a MCP server for your Rsbuild app to provide information about your setup and modules graphs.

Usage

Install:

npm add rsbuild-plugin-mcp -D

Add plugin to your rsbuild.config.ts:

import { defineConfig } from '@rsbuild/core';
import { pluginMcp } from 'rsbuild-plugin-mcp';

export default defineConfig({
  plugins: [pluginMcp()],
});

Options

mcpRouteRoot

• Type: string | undefined
• Default: /__mcp

Customize the routes of the MCP server.

• Example:

import { defineConfig } from '@rsbuild/core';
import { pluginMcp } from 'rsbuild-plugin-mcp';

export default defineConfig({
  plugins: [
    pluginMcp({
      mcpRouteRoot: '/api/__mcp',
    }),
  ],
});

Customize the MCP server

The MCP server can be extended with the following ways:

With plugin options

Use the mcpServerSetup to customize the MCP server.

import { defineConfig } from '@rsbuild/core';
import { pluginMcp } from 'rsbuild-plugin-mcp';

export default defineConfig({
  plugins: [
    pluginMcp({
      mcpServerSetup(mcpServer) {
        // Register tools, resources and prompts
        mcpServer.tool(); /** args */
        mcpServer.resource(); /** args */
        mcpServer.prompt(); /** args */
      },
    }),
  ],
});

You may also return a new McpServer instance to replace the default one:

import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { defineConfig } from '@rsbuild/core';
import { pluginMcp } from 'rsbuild-plugin-mcp';

export default defineConfig({
  plugins: [
    pluginMcp({
      mcpServerSetup() {
        // Create a new `McpServer` and return
        const mcpServer = new McpServer();
        // Register tools, resources and prompts
        mcpServer.tool();
        return mcpServer;
      },
    }),
  ],
});

With other plugins

This plugin exposes the McpServer instance using api.expose.

You may use api.useExposed to get the instance and make customization:

import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
import type { RsbuildPlugin } from '@rsbuild/core'

export function pluginFoo(): RsbuildPlugin {
  return {
    name: 'plugin-foo',
    pre: ['plugin-mcp'],
    setup(api) {
      if (api.isPluginExists('plugin-mcp')) {
        const mcpServer = api.useExposed<McpServer>('rsbuild-plugin-mcp:mcpServer')!
        // Register tools, resources and prompts
        mcpServer.tool(/** args */)
        mcpServer.resource(/** args */)
        mcpServer.prompt(/** args */)
      }
    },
  },
}

Credits

This plugin is inspired by vite-plugin-mcp. Both the implementation and documentation have been adapted and referenced from the original Vite plugin.

License

MIT.