MastraAI•4d ago

Mastra MCP Windows Fix (Claude Code Extension)

Hey everyone! Just wanted to share a fix for anyone running into issues with the Mastra MCP server on Windows 10 using the VSCode/Cursor Claude Code extension. The Problem The MCP server kept failing to connect with this error:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '@mastra/core/base'

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '@mastra/core/base'

The Fix In your .mcp.json, pin the package to version 0.13.31:

{
  "mcpServers": {
    "mastra": {
      "type": "stdio",
      "command": "cmd",
      "args": ["/c", "npx", "-y", "@mastra/mcp-docs-server@0.13.31"],
      "env": {}
    }
  }
}

{
  "mcpServers": {
    "mastra": {
      "type": "stdio",
      "command": "cmd",
      "args": ["/c", "npx", "-y", "@mastra/mcp-docs-server@0.13.31"],
      "env": {}
    }
  }
}

Key points for Windows: - Use "command": "cmd" with the /c wrapper - Pin to @0.13.31 - Restart VSCode after saving Quick Question Does pinning to version 0.13.31 mean we get outdated docs, or does it still pull the latest documentation from the live site?

3 Replies

Mastra Triager•4d ago

📝 Created GitHub issue: https://github.com/mastra-ai/mastra/issues/8964

GitHub

[DISCORD:1428654079155900557] Mastra MCP Windows Fix (Claude Code E...

This issue was created from Discord post: https://discord.com/channels/1309558646228779139/1428654079155900557 Hey everyone! Just wanted to share a fix for anyone running into issues with the Mastr...

Bhupesh Gupta•4d ago

good

Abhi Aiyer•4d ago

Thanks for this!

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Mastra MCP Windows Fix (Claude Code Extension)

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