The readme lacks a description about npx.

[CharlinChen]

Describe the bug
I followed the steps in the README to run the simplest demo and encountered an error:

Error: Cannot find module 'libnpx'

To Reproduce
Steps to reproduce the behavior:

1. in Ubuntu 20.04.6 LTS
2. pip install mcp
3. pip install mcp[cli]
4. run mcp dev server.py

Expected behavior
Error with:

node:internal/modules/cjs/loader:1078
  throw err;
  ^

Error: Cannot find module 'libnpx'
Require stack:
- /usr/share/npm/bin/npx-cli.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1075:15)
    at Module._load (node:internal/modules/cjs/loader:920:27)
    at Module.require (node:internal/modules/cjs/loader:1141:19)
    at require (node:internal/modules/cjs/helpers:110:18)
    at Object.<anonymous> (/usr/share/npm/bin/npx-cli.js:3:13)
    at Module._compile (node:internal/modules/cjs/loader:1254:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1308:10)
    at Module.load (node:internal/modules/cjs/loader:1117:32)
    at Module._load (node:internal/modules/cjs/loader:958:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/usr/share/npm/bin/npx-cli.js' ]
}

Node.js v18.16.0
[03/17/25 03:22:12] ERROR    Dev server failed                                                                                                  cli.py:261

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: linux
• Browser None
• Version 1.4.1

[Kludex]

This package doesn't need npx installed.

Which demo?