diff --git a/.agents/skills/git-commit-ja/SKILL.md b/.agents/skills/git-commit-ja/SKILL.md
index 50fbc03..985ef5b 100644
--- a/.agents/skills/git-commit-ja/SKILL.md
+++ b/.agents/skills/git-commit-ja/SKILL.md
@@ -7,4 +7,4 @@ allowed-tools: Bash, Skill
 
 Use /git-commit to perform the commit, but write the commit message description **in Japanese**.
 
-Example: `feat(alacritty): 透明度設定を追加`
+Example: `fix(alacritty): 起動時警告を消すため非推奨オプションを削除`
diff --git a/.agents/skills/git-commit/SKILL.md b/.agents/skills/git-commit/SKILL.md
index e1f7093..1fa79ca 100644
--- a/.agents/skills/git-commit/SKILL.md
+++ b/.agents/skills/git-commit/SKILL.md
@@ -26,7 +26,9 @@ If a `--path <dir>` argument is provided (e.g. invoked as `git-commit --path /tm
 3. Stage and commit using `git apply` (see below)
 
 ## Principle
-- Write **Why** (why the change was made) in the commit message. Leave What to the diff.
+- Write **Why** in the subject line itself — keep it concise but meaningful.
+- Body is optional. If you feel a body is necessary, the commit is likely too large — consider splitting it.
+- Footer (Co-Authored-By) is always required.
 - Each commit must be **independently revertable** without breaking other functionality.
 
 ## Commit Granularity
@@ -61,7 +63,16 @@ Conventional Commits v1.0.0
 
 Format: `type(scope): description`
 - scope: optional (e.g., `alacritty`, `vim`, `git`)
-- **description: in English**
+- **description: in English** — convey Why, not just What, but keep it short
+
+Examples:
+```
+# Too vague (What only)
+fix(git): remove deprecated option
+
+# Better (Why in subject)
+fix(git): remove deprecated option to prevent startup warning
+```
 
 Types:
 - `feat`: new feature
diff --git a/.agents/skills/git-worktree/SKILL.md b/.agents/skills/git-worktree/SKILL.md
index aef3da3..ee7c1e1 100644
--- a/.agents/skills/git-worktree/SKILL.md
+++ b/.agents/skills/git-worktree/SKILL.md
@@ -23,6 +23,7 @@ Create a git worktree for the current changes so they can be worked on in isolat
 4. Copy all modified/untracked files from the current working directory into the worktree, preserving directory structure:
    ```
    # For each changed file shown in git status (macOS-compatible):
+   cd $(git rev-parse --show-toplevel)
    rsync -R {file} /tmp/{branch-name}/
    ```
 
diff --git a/.cursor/settings.json b/.cursor/settings.json
index fa8672e..bf636da 100644
--- a/.cursor/settings.json
+++ b/.cursor/settings.json
@@ -67,9 +67,7 @@
 
   // background - opacity
   "vscode_vibrancy.opacity": 0.42,
-  "workbench.colorCustomizations": {
-    "terminal.background": "#00000000"
-  },
+  "workbench.colorCustomizations": {},
   "workbench.panel.showLabels": false,
   "zig.zls.enabled": "on",
   "cursor.cpp.disabledLanguages": [
@@ -77,9 +75,6 @@
     "plaintext",
     "c"
   ],
-  "terminal.integrated.gpuAcceleration": "off",
-  "window.systemColorTheme": "dark",
-  "window.autoDetectColorScheme": false,
   "accessibility.signals.terminalBell": {
     "sound": "on"
   }