devenv: fixup generate cli

devenv/src/cli.rs

@@ -1,5 +1,6 @@
 use crate::log::LogFormat;
 use clap::{crate_version, Parser, Subcommand};
+use indoc::indoc;
 use std::path::PathBuf;
 use tracing::error;
 
@@ -184,9 +185,16 @@ pub enum Commands {
     #[command(about = "Scaffold devenv.yaml, devenv.nix, .gitignore and .envrc.")]
     Init { target: Option<PathBuf> },
 
-    #[command(about = "Generate devenv.yaml and devenv.nix using AI")]
+    #[command(
+        about = "Generate devenv.yaml and devenv.nix using AI",
+        long_about = indoc! {"
+          Generate devenv.yaml and devenv.nix using AI.
+
+          Use of this feature is subject to the terms of service at https://devenv.new/tos
+        "}
+    )]
     Generate {
-        #[arg(num_args=0.., trailing_var_arg = true)]
+        #[arg(num_args=1.., required = true, trailing_var_arg = true)]
         description: Vec<String>,
 
         #[clap(long, default_value = "https://devenv.new")]