fix

- check CHANGELOG.md ver 0.2.1-alpha

internal/controllers/cli/add.go

@@ -1,11 +1,20 @@
 package cli
 
 import (
+	"fmt"
+	"github.com/abelith/spellbook/internal/errors"
 	"github.com/abelith/spellbook/internal/models"
 	"github.com/spf13/cobra"
 	"strings"
 )
 
+var reservedCommands = map[string]struct{}{
+	"add":        {},
+	"rm":         {},
+	"help":       {},
+	"completion": {},
+}
+
 func NewAddCommand(app Application) *cobra.Command {
 	spell := models.Spell{}
 
@@ -16,6 +25,14 @@ func NewAddCommand(app Application) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			ctx := cmd.Context()
 
+			if len(args) < 1 {
+				return errors.ErrInsufficientArgs
+			}
+
+			if isReservedCommand(args[0]) {
+				return fmt.Errorf("%w: %s", errors.ErrReservedCmd, args[0])
+			}
+
 			spell.Spell = strings.Join(args, " ")
 			return app.AddSpell(ctx, spell)
 		},
@@ -27,3 +44,8 @@ func NewAddCommand(app Application) *cobra.Command {
 
 	return cmd
 }
+
+func isReservedCommand(cmd string) bool {
+	_, reserved := reservedCommands[strings.ToLower(cmd)]
+	return reserved
+}