MCP server for msw

Name: MCP server for msw
Author: JasonBoy

@JasonBoy

Repository Homepage

About MCP server for msw

Cli & MCP server for msw (Mock Service Worker) for AI Agents with dynamic mocking

#mock #api-mock #msw #test

Basic information

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "msw-mcp": {
      "command": "npx",
      "args": [
        "msw-mcp@latest"
      ]
    }
  }
}

Tools

Add MSW request handlers to the browser service worker at runtime. Accepts JavaScript handler code strings that will be executed in the browser.

Reset MSW request handlers in the browser service worker. If no handlers provided, removes all runtime handlers and keeps only initial ones. If handlers provided, replaces all handlers with the new ones.

Remove specific MSW request handlers from the browser service worker by URL patterns and optional HTTP methods.

Update existing MSW request handlers by replacing handlers that match specified URL patterns with new handler code. This is an atomic operation that removes old handlers and adds new ones in a single transaction.

Get the current status of the MSW service worker, including connection state, worker status, and active handlers.

Overview

What is MCP server for msw?

MCP server for msw is a Model Context Protocol server that bridges AI agents with Mock Service Worker (MSW). It enables dynamic addition, updating, and removal of MSW network mocks directly from an AI assistant or command line, without restarting the application.

How to use MCP server for msw?

Register the server in your MCP client using the command npx msw-mcp@latest. Then use the /msw-setup prompt to scaffold the browser‑side integration (requires msw, @msw-mcp/client, and the worker bridge). Alternatively, use the msw-cli for terminal control.

Key features of MCP server for msw

Generate MSW handlers with AI assistance
Update mocks without reloading the page
WebSocket bridge between CLI/MCP and the browser
Scaffold MSW setup with /msw-setup prompt
Terminal and script control via msw-cli
Configurable port, persistence, and client targeting

Use cases of MCP server for msw

Let AI agents dynamically mock API responses during development
Update network mocks live while a user is testing an application
Scaffold a complete MSW setup in a new project without manual steps
Control mock handlers from CI scripts or automated test suites

FAQ from MCP server for msw

What is the difference between msw-cli and msw-mcp?

msw-cli is a command‑line tool for terminal and script control; msw-mcp is the MCP server that enables AI assistants to manage mocks via MCP tools. Both use the same WebSocket bridge and core daemon.

Does MCP server for msw require a browser?

Yes. The server depends on MSW running in a browser environment, and the @msw-mcp/client package must be loaded in the page to receive updates via the WebSocket bridge.

How do I install and configure MCP server for msw?

Install by registering the server in your MCP client config with "command": "npx", "args": ["msw-mcp@latest"]. Then run the /msw-setup prompt in the assistant to follow the scaffold steps.

What runtime dependencies does MCP server for msw have?

It requires Node.js (for the MCP server) and the browser to load msw, @msw-mcp/client, and the worker file. The server is published on npm as msw-mcp.

What transport does MCP server for msw use?

The MCP server communicates via stdio (standard input/output) with the MCP client. The browser bridge uses WebSocket.

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