diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 84b1721..8deffa0 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -53,7 +53,7 @@
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
 				// General utilities
-				"sanaajani.taskrunnercode", // Run tasks from Explorer pane
+				"actboy168.tasks", // ステータスバーからタスクを実行（旧 sanaajani.taskrunnercode の後継）
 				"visualstudioexptteam.vscodeintellicode", // AI-assisted development (Microsoft)
 				"yzhang.markdown-all-in-one", // Markdown
 				"zainchen.json", // Json
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 174fe63..1b6e83a 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,5 +1,7 @@
 {
 	"recommendations": [
+		"actboy168.tasks", // ステータスバーからタスクを実行（メニュー的にクリックで実行）
+
 		"vscjava.vscode-java-pack", // Extension Pack for Java (Microsoft)
 
 		"ms-python.python", // Python IntelliSense (Microsoft)
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..16a9931
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,10 @@
+{
+	// 以下は拡張 actboy168.tasks 固有の設定。
+	// この拡張が未インストールの環境では単に無視される（エラーにはならない）。
+	// ステータスバーのタスク表示制御:
+	// limit: ボタンとして直接表示する個数（tasks.json 定義順の先頭から）。
+	// 1 = 先頭の「テスト」だけボタン表示、残りは下のメニューに集約。
+	"tasks.statusbar.limit": 1,
+	// 集約メニューのラベル（クリックでタスク一覧のクイックピックが開く）
+	"tasks.statusbar.select.label": "$(checklist) AtCoder"
+}
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 24355f5..3aaf4df 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -1,92 +1,113 @@
 {
-    // See https://go.microsoft.com/fwlink/?LinkId=733558
-    // for the documentation about the tasks.json format
     "version": "2.0.0",
     "tasks": [
         {
-            "label": "AtCoder: OPEN Task Page",
+            "label": "AtCoder: TEST code",
             "type": "shell",
             "options": {
-                "cwd": "${fileDirname}"
+                "cwd": "${fileDirname}",
+                "statusbar": {
+                    "label": "$(beaker) テスト",
+                    "detail": "開いているファイルをテスト (am t)"
+                }
             },
-            "command": "am web",
+            "command": "am t ${fileExtname}",
             "problemMatcher": [],
             "presentation": {
                 "echo": false,
-                "reveal": "never",
+                "reveal": "always",
                 "focus": false,
                 "panel": "shared",
                 "showReuseMessage": false,
                 "clear": true
             },
             "group": {
-                "kind": "build",
+                "kind": "test",
                 "isDefault": true
             }
         },
         {
-            "label": "AtCoder: TEST code",
+            "label": "AtCoder: SUBMIT code",
             "type": "shell",
             "options": {
-                "cwd": "${fileDirname}"
+                "cwd": "${fileDirname}",
+                "statusbar": {
+                    "label": "$(cloud-upload) 提出",
+                    "detail": "開いているファイルを提出 (am s)",
+                    "color": "#e2c08d"
+                }
             },
-            "command": "am t ${fileExtname}",
-            "problemMatcher": [],
+            "command": "am s ${fileBasename}",
             "presentation": {
                 "echo": false,
                 "reveal": "always",
-                "focus": false,
+                "focus": true,
                 "panel": "shared",
                 "showReuseMessage": false,
                 "clear": true
             },
-            "group": {
-                "kind": "test",
-                "isDefault": true
-            }
+            "problemMatcher": []
         },
         {
-            "label": "AtCoder: TEST(float) code",
+            "label": "AtCoder: OPEN Task Page",
             "type": "shell",
             "options": {
-                "cwd": "${fileDirname}"
+                "cwd": "${fileDirname}",
+                "statusbar": {
+                    "label": "$(globe) 問題ページ",
+                    "detail": "問題ページをブラウザで開く (am web)"
+                }
             },
-            "command": "am tf ${fileExtname}",
+            "command": "am web",
             "problemMatcher": [],
             "presentation": {
                 "echo": false,
-                "reveal": "always",
+                "reveal": "never",
                 "focus": false,
                 "panel": "shared",
                 "showReuseMessage": false,
                 "clear": true
             },
+            // 既定ビルドタスク（Ctrl+Shift+B / Cmd+Shift+B）で問題ページを開く、という
+            // 意図的な割り当て（CLAUDE.md に記載の運用）。変更しないこと。
             "group": {
-                "kind": "test"
-              }
+                "kind": "build",
+                "isDefault": true
+            }
         },
         {
-            "label": "AtCoder: SUBMIT code",
+            "label": "AtCoder: TEST(float) code",
             "type": "shell",
             "options": {
-                "cwd": "${fileDirname}"
+                "cwd": "${fileDirname}",
+                "statusbar": {
+                    "label": "$(beaker) テスト(誤差)",
+                    "detail": "浮動小数点誤差を許容してテスト (am tf)"
+                }
             },
-            "command": "am s ${fileBasename}",
+            "command": "am tf ${fileExtname}",
+            "problemMatcher": [],
             "presentation": {
                 "echo": false,
                 "reveal": "always",
-                "focus": true,
+                "focus": false,
                 "panel": "shared",
                 "showReuseMessage": false,
                 "clear": true
             },
-            "problemMatcher": []
+            "group": {
+                "kind": "test"
+            }
         },
         {
             "label": "AtCoder: setup NEW contest",
             "type": "shell",
             "options": {
-                "cwd": "${env:CONTEST_DIR}"
+                "cwd": "${env:CONTEST_DIR}",
+                "statusbar": {
+                    "label": "$(new-folder) 新規コンテスト",
+                    "detail": "新しいコンテストをセットアップ (am new)"
+                }
             },
             "command": "am new ${input:contest_id} && am open-first ${input:contest_id}",
             "presentation": {
@@ -100,7 +121,7 @@
             "problemMatcher": []
         }
     ],
-    "inputs":[
+    "inputs": [
         {
             "id": "contest_id",
             "description": "参加するコンテスト名",