diff --git a/skills/dispatch-webhook/SKILL.md b/skills/dispatch-webhook/SKILL.md
index a29b9ef..b5ca580 100644
--- a/skills/dispatch-webhook/SKILL.md
+++ b/skills/dispatch-webhook/SKILL.md
@@ -112,3 +112,4 @@ Task ID: {task_id}
 | 401 Unauthorized | 立即失敗，提示設定 token |
 | 超時（> 30s） | 返回 accepted，等待 callback |
 | VPS 回傳 500 | 記錄錯誤，通知使用者 |
+| 非 HTTPS Webhook（且非 localhost/127.0.0.1） | 直接拒絕，避免 Bearer Token 明文傳輸 |
diff --git a/skills/dispatch-webhook/handler.ts b/skills/dispatch-webhook/handler.ts
index 2712ea9..504f975 100644
--- a/skills/dispatch-webhook/handler.ts
+++ b/skills/dispatch-webhook/handler.ts
@@ -51,6 +51,13 @@ function validateInput(raw: any): DispatchInput {
     throw new Error('Webhook URL 協定不支援，僅允許 http 或 https');
   }
 
+  // 安全預設：正式環境僅允許 HTTPS，避免 Bearer Token 明文傳輸
+  // 本機開發保留 http://localhost 與 http://127.0.0.1 例外
+  const isLocalhost = ['localhost', '127.0.0.1'].includes(parsedUrl.hostname);
+  if (parsedUrl.protocol !== 'https:' && !isLocalhost) {
+    throw new Error('Webhook URL 安全性不足：非本機位址必須使用 https');
+  }
+
   if (!input.webhookToken || typeof input.webhookToken !== 'string') {
     throw new Error(`${input.target.toUpperCase()} Webhook Token 未設定`);
   }