Mcp.json is not loaded

I’m using Cursor 0.45.

after setting up ~/.cursor/mcp.json, the config is not loaded in IDE, and is not usable in composer.

is there any way to force refresh mcp servers?

===
cat ~/.cursor/mcp.json

{
  "mcpServers": {
    "moxt": {
      "url": "http://localhost:8000/sse",
      "env": {
        "TOKEN": "test"
      }
    }
  }
}

ok, just figure out the settings are only supported in 0.47