fix: reject positional arguments in shortcuts (#227)

* fix: reject positional arguments in shortcuts with clear error

Shortcuts silently ignored positional arguments (e.g. `lark-cli docs
+search "hello"`), causing empty results. Add Args validator to all
declarative shortcuts so cobra prints usage and a clear error message
telling users to pass values via flags instead.

Change-Id: I7579f9c871138cf91dd5f5d8c1d51bda3f77a1db

* fix: address PR review comments

- Remove unused *Shortcut parameter from rejectPositionalArgs
- Show all positional args in error message instead of only the first
- Add test case for multiple positional arguments

Change-Id: Ifea92d09ddabcd35fbf2db98d9888d18af59b894

shortcuts/common/runner.go

@@ -470,6 +470,7 @@ func (s Shortcut) mountDeclarative(parent *cobra.Command, f *cmdutil.Factory) {
 	cmd := &cobra.Command{
 		Use:   shortcut.Command,
 		Short: shortcut.Description,
+		Args:  rejectPositionalArgs(),
 		RunE: func(cmd *cobra.Command, _ []string) error {
 			return runShortcut(cmd, f, &shortcut, botOnly)
 		},
@@ -685,6 +686,19 @@ func handleShortcutDryRun(f *cmdutil.Factory, rctx *RuntimeContext, s *Shortcut)
 	return nil
 }
 
+// rejectPositionalArgs returns a cobra.PositionalArgs that rejects any
+// positional arguments. The error is intentionally a plain error (not
+// ExitError) so that cobra prints usage and the root handler prints a
+// simple "Error:" line instead of a JSON envelope.
+func rejectPositionalArgs() cobra.PositionalArgs {
+	return func(cmd *cobra.Command, args []string) error {
+		if len(args) == 0 {
+			return nil
+		}
+		return fmt.Errorf("positional arguments are not supported (got %q); pass values via flags", args)
+	}
+}
+
 func registerShortcutFlags(cmd *cobra.Command, s *Shortcut) {
 	for _, fl := range s.Flags {
 		desc := fl.Desc

shortcuts/common/runner_args_test.go

@@ -0,0 +1,58 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package common
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/spf13/cobra"
+)
+
+func TestRejectPositionalArgs_WithArgs(t *testing.T) {
+	t.Parallel()
+
+	validator := rejectPositionalArgs()
+
+	err := validator(&cobra.Command{}, []string{"hello"})
+	if err == nil {
+		t.Fatal("expected error for positional arg, got nil")
+	}
+	if !strings.Contains(err.Error(), "positional arguments are not supported") {
+		t.Errorf("expected positional args rejection message, got: %v", err)
+	}
+	if !strings.Contains(err.Error(), `"hello"`) {
+		t.Errorf("expected the positional arg value in error, got: %v", err)
+	}
+}
+
+func TestRejectPositionalArgs_MultipleArgs(t *testing.T) {
+	t.Parallel()
+
+	validator := rejectPositionalArgs()
+
+	err := validator(&cobra.Command{}, []string{"hello", "world"})
+	if err == nil {
+		t.Fatal("expected error for multiple positional args, got nil")
+	}
+	if !strings.Contains(err.Error(), "positional arguments are not supported") {
+		t.Errorf("unexpected error message: %v", err)
+	}
+	if !strings.Contains(err.Error(), "hello") || !strings.Contains(err.Error(), "world") {
+		t.Errorf("expected all positional args in error, got: %v", err)
+	}
+}
+
+func TestRejectPositionalArgs_NoArgs(t *testing.T) {
+	t.Parallel()
+
+	validator := rejectPositionalArgs()
+
+	if err := validator(&cobra.Command{}, nil); err != nil {
+		t.Fatalf("expected no error for nil args, got: %v", err)
+	}
+	if err := validator(&cobra.Command{}, []string{}); err != nil {
+		t.Fatalf("expected no error for empty args, got: %v", err)
+	}
+}