diff --git a/.github/workflows/scheduler_daily.yml b/.github/workflows/scheduler_daily.yml
index 1ab98f3..62fe58b 100644
--- a/.github/workflows/scheduler_daily.yml
+++ b/.github/workflows/scheduler_daily.yml
@@ -119,13 +119,13 @@ jobs:
         # For posting a simple plain text message
         payload: |
           {
-            "text": "<@yasulab> Failed to build DojoMap. (詳細を見る)",
+            "text": "<@yasulab> Failed to build DojoMap. » 詳細を見る (GitHub)",
             "blocks": [
               {
                 "type": "section",
                 "text": {
                   "type": "mrkdwn",
-                  "text": "<@yasulab> Failed to build DojoMap. (<https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}|詳細を見る>)"
+                  "text": "<@yasulab> Failed to build DojoMap. <https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}|» 詳細を見る (GitHub)>"
                 }
               }
             ]
diff --git a/.github/workflows/test_slack_notification.yml b/.github/workflows/test_slack_notification.yml
index 4df576f..2e6593e 100644
--- a/.github/workflows/test_slack_notification.yml
+++ b/.github/workflows/test_slack_notification.yml
@@ -27,13 +27,13 @@ jobs:
         # scheduler_daily.yml と同じ形式のペイロード（文面のみテスト用）
         payload: |
           {
-            "text": "`[TEST]` DojoMap の Slack 通知テストです。(詳細を見る)",
+            "text": "`[TEST]` DojoMap の Slack 通知テストです。» 詳細を見る (GitHub)",
             "blocks": [
               {
                 "type": "section",
                 "text": {
                   "type": "mrkdwn",
-                  "text": "`[TEST]` DojoMap の Slack 通知テストです。(<https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}|詳細を見る>)"
+                  "text": "`[TEST]` DojoMap の Slack 通知テストです。<https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}|» 詳細を見る (GitHub)>"
                 }
               }
             ]