Function remote_mcp_infer 

pub fn remote_mcp_infer(
    transport: &McpTransport,
    infer_tool: Option<&str>,
    model: Option<&str>,
    system: Option<&str>,
    prompt: &str,
) -> Result<String, String>

Run one inference over the configured MCP transport and return the completion text.

infer_tool defaults to DEFAULT_INFER_TOOL when None. This is a blocking call — the caller should run it off the UI thread (the desktop command wrapper uses spawn_blocking).