Troubleshooting DESIGN.md CLI Installation on Windows: Complete Guide

On Windows, the design.md command fails because the operating system interprets the .md extension as a Markdown file association rather than an executable, forcing you to use the designmd alias or quoted package names to run the CLI successfully.

Installing the @google/design.md package on Windows often results in silent failures or the accidental launching of Markdown editors instead of command execution. This issue stems from a fundamental conflict between the CLI's default executable name and Windows file association handling. This guide explains the root cause documented in the google-labs-code/design.md repository and provides verified workarounds to resolve installation and execution errors on Windows systems.

Why DESIGN.md CLI Fails on Windows

The @google/design.md CLI declares two binaries in packages/cli/package.json at lines 22–25: design.md pointing to ./dist/index.js, and designmd as an alias pointing to the same entry point. On Windows, the command shell resolves design.md by searching for design.md.exe or falling back to the file association for .md files. Because Windows treats .md as a document extension rather than an executable suffix, invoking the command opens the file in the default Markdown editor instead of executing the Node.js script, resulting in no CLI output or unexpected application launches.

How to Fix DESIGN.md CLI Installation Errors on Windows

Quote the Package Name During Installation

PowerShell interprets the @ symbol as a special character, which can cause syntax errors when running installation commands. Always quote the package name to ensure proper resolution.

npm install "@google/design.md"

Use the designmd Alias to Bypass File Associations

The designmd alias avoids the .md extension collision entirely. When using npx, prepend the package with -p and invoke the alias directly to ensure cross-shell compatibility on Windows.

npx -p @google/design.md designmd lint path/to/DESIGN.md

This command explicitly calls the alias defined in packages/cli/package.json, bypassing Windows file association logic.

Add an npm Script for Cross-Platform Compatibility

For project-level consistency, add a script to your package.json that uses the designmd alias. This abstraction ensures the command works regardless of the host operating system.

{
  "scripts": {
    "design:lint": "designmd lint DESIGN.md"
  }
}

Running npm run design:lint now resolves the correct binary through the local Node_modules .bin directory, avoiding Windows shell resolution issues.

Verify npm Registry Configuration

An ENOVERSIONS error during installation typically indicates a misconfigured npm registry rather than a package-specific problem. Verify your registry points to the official npm source.

npm config get registry

# Expected output: https://registry.npmjs.org/

If the output differs, reset the registry and clear the cache before retrying installation.

Quick Checklist for Windows Installation

• Quote the install command: Run npm install "@google/design.md" (or pnpm add "@google/design.md").
• Prefer the alias: Use npx -p @google/design.md designmd lint DESIGN.md instead of design.md.
• Abstract with scripts: Add "design:lint": "designmd lint DESIGN.md" to package.json.
• Verify registry: Confirm npm config get registry returns https://registry.npmjs.org/.
• Avoid direct invocation: Never call the bare design.md binary from the command line on Windows.

Summary

• The design.md executable conflicts with Windows file associations for .md documents.
• Use the designmd alias defined in packages/cli/package.json to execute commands successfully.
• Quote package names in PowerShell to prevent syntax errors with the @ scope.
• Configure npm scripts to provide a consistent interface across operating systems.
• Check npm registry settings when encountering ENOVERSIONS errors during installation.

Frequently Asked Questions

Why does running design.md open my Markdown editor instead of the CLI?

Windows treats any string ending in .md as a document file, triggering the default file association for Markdown editors. When you type design.md, the shell looks for an executable named design.md.exe, fails to find it, and falls back to opening the file association. This behavior occurs in PowerShell, Command Prompt, and Git Bash alike.

What is the difference between design.md and designmd commands?

Both commands map to the same entry point at ./dist/index.js as declared in packages/cli/package.json. The design.md name follows npm naming conventions for the package, while designmd serves as a Windows-compatible alias that avoids the file extension conflict. Functionally, they execute identical code from packages/cli/src/commands/lint.ts.

How do I fix ENOVERSIONS errors when installing the package?

An ENOVERSIONS error typically indicates your npm client is querying a registry that does not host the package, such as a private corporate registry or an outdated mirror. Run npm config get registry to verify it points to https://registry.npmjs.org/. If necessary, reset with npm config set registry https://registry.npmjs.org/ and clear the cache with npm cache clean --force.

Can I use the DESIGN.md CLI in Git Bash on Windows?

Yes, but the .md extension issue persists across all Windows shells including Git Bash, because the underlying Windows API still handles file associations. You must use the designmd alias or invoke the CLI through npm scripts to ensure proper execution. Direct calls to design.md will still trigger the file association behavior even in Unix-like emulators.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}