Claude Desktop MCP 配置：桌面扩展、JSON、运行环境与日志排错

node --version
npm --version
$desktopMcpLab = Join-Path $env:USERPROFILE 'mcp-desktop-lab'
New-Item -ItemType Directory -Force -Path (Join-Path $desktopMcpLab 'data') | Out-Null
Set-Content -LiteralPath (Join-Path $desktopMcpLab 'data/probe.txt') -Value 'Desktop MCP sample: 314159' -Encoding UTF8
$desktopFsVersionOutput = npm view @modelcontextprotocol/server-filesystem version
if ($LASTEXITCODE -ne 0 -or -not $desktopFsVersionOutput) { throw '版本查询失败' }
$desktopFsVersion = ([string]$desktopFsVersionOutput).Trim()
npm view "@modelcontextprotocol/server-filesystem@$desktopFsVersion" name version repository.url bin --json

npm install --prefix (Join-Path $desktopMcpLab 'runtime') --save-exact --ignore-scripts "@modelcontextprotocol/server-filesystem@$desktopFsVersion"
if ($LASTEXITCODE -ne 0) { throw '安装未完成，不要继续修改 Desktop 配置' }

node --version
npm --version
desktop_mcp_lab="$HOME/mcp-desktop-lab"
mkdir -p "$desktop_mcp_lab/data"
printf '%s\n' 'Desktop MCP sample: 314159' > "$desktop_mcp_lab/data/probe.txt"
desktop_fs_version="$(npm view @modelcontextprotocol/server-filesystem version)"
test -n "$desktop_fs_version" || exit 1
npm view "@modelcontextprotocol/server-filesystem@$desktop_fs_version" name version repository.url bin --json

npm install --prefix "$desktop_mcp_lab/runtime" --save-exact --ignore-scripts "@modelcontextprotocol/server-filesystem@$desktop_fs_version"

const fs = require('node:fs');
const os = require('node:os');
const path = require('node:path');
const lab = path.join(os.homedir(), 'mcp-desktop-lab');
const entry = path.join(lab, 'runtime', 'node_modules', '@modelcontextprotocol', 'server-filesystem', 'dist', 'index.js');
const data = path.join(lab, 'data');
if (!fs.existsSync(entry) || !fs.existsSync(path.join(data, 'probe.txt'))) {
  throw new Error('未找到已安装入口或 probe.txt；先完成准备与安装');
}
console.log(JSON.stringify({
  mcpServers: {
    desktopLabFiles: {
      command: process.execPath,
      args: [entry, data]
    }
  }
}, null, 2));