Do not pass the command itself in the argument.

Author: suztomo

internal/librariangen/languagecontainer/languagecontainer.go

@@ -42,6 +42,8 @@ type LanguageContainer struct {
 }
 
 // Run accepts an implementation of the LanguageContainer.
+// The args parameter contains the command-line arguments passed to the container,
+// without including the program name. Usually it's os.Args[1:].
 func Run(args []string, container *LanguageContainer) int {
 	// Logic to parse args and call the appropriate method on the container.
 	// For example, if args[1] is "generate":

internal/librariangen/main.go

@@ -52,7 +52,7 @@ func runCLI(args []string) int {
 		Generate:    generate.Generate,
 		ReleaseInit: release.Init,
 	}
-	return languagecontainer.Run(args, &container)
+	return languagecontainer.Run(args[1:], &container)
 }
 
 func parseLogLevel(logLevelEnv string) slog.Level {