From ed355a474fea43a74b9dab867cf23fff085fdb34 Mon Sep 17 00:00:00 2001
From: Kynan Ware <47394200+BagToad@users.noreply.github.com>
Date: Tue, 12 May 2026 14:16:06 -0600
Subject: [PATCH] Reject --add-sub-issue when editing multiple issues

A sub-issue can have only one parent, so applying --add-sub-issue
across multiple parent args is ambiguous.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 pkg/cmd/issue/edit/edit.go      | 4 ++++
 pkg/cmd/issue/edit/edit_test.go | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/pkg/cmd/issue/edit/edit.go b/pkg/cmd/issue/edit/edit.go
index 78e8f1e83..81a3d79e9 100644
--- a/pkg/cmd/issue/edit/edit.go
+++ b/pkg/cmd/issue/edit/edit.go
@@ -200,6 +200,10 @@ func NewCmdEdit(f *cmdutil.Factory, runF func(*EditOptions) error) *cobra.Comman
 				return cmdutil.FlagErrorf("multiple issues cannot be edited interactively")
 			}
 
+			if len(opts.IssueNumbers) > 1 && len(opts.AddSubIssues) > 0 {
+				return cmdutil.FlagErrorf("`--add-sub-issue` cannot be used when editing multiple issues")
+			}
+
 			if runF != nil {
 				return runF(opts)
 			}
diff --git a/pkg/cmd/issue/edit/edit_test.go b/pkg/cmd/issue/edit/edit_test.go
index 6fc4d6ea7..f5811927e 100644
--- a/pkg/cmd/issue/edit/edit_test.go
+++ b/pkg/cmd/issue/edit/edit_test.go
@@ -336,6 +336,11 @@ func TestNewCmdEdit(t *testing.T) {
 				AddSubIssues: []string{"123", "124"},
 			},
 		},
+		{
+			name:     "add-sub-issue rejected with multiple issues",
+			input:    "23 24 --add-sub-issue 123",
+			wantsErr: true,
+		},
 		{
 			name:  "remove-sub-issue flag",
 			input: "23 --remove-sub-issue 50",