Unable to Implement Additional MCP Servers (Fetch, SQLite, Filesystem)

[liquiddeath1900]

Unable to add Fetch, SQLite, or Filesystem MCP servers to Claude Desktop. Each server fails to connect with different errors (timeout/permission denied) while core servers remain functional.

Steps to reproduce the behavior:
Configure working core servers (Brave Search, Memory, Sequential)
Add new server to claude_desktop_config.json, for example SQLite:

jsonCopy"sqlite": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-sqlite"
]
}

Install required packages:

npm install @modelcontextprotocol/server-sqlite
Repeat for fetch and filesystem

Restart Claude Desktop
Enable DevTools (Command-Option-Shift-i)
Observe connection errors in console

Expected behavior
Additional MCP servers should:

Successfully install via npm
Connect on Claude Desktop startup
Remain connected like core servers
Be available for use within Claude

Logs
DevTools Console Output showing actual behavior:
CopyConnected to MCP server memory
Connected to MCP server brave-search
Connected to MCP server sequential
Could not attach to MCP server sqlite: eE: MCP error -2: Request timed out