diff --git a/SKILL.md b/SKILL.md
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+# Microsoft To Do
+
+When the user asks to add a reminder, todo, task, or Microsoft To Do item, call the n8n webhook.
+
+The webhook URL is provided by the environment variable `N8N_TODO_WEBHOOK_URL`.
+
+Input JSON format:
+
+```json
+{
+  "title": "续费 OVH",
+  "due": "2026-05-21T15:00:00",
+  "reminder": "2026-05-21T15:00:00"
+}
+```
+Use local Asia/Shanghai time unless the user specifies another timezone.
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diff --git a/add_todo.py b/add_todo.py
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+#!/usr/bin/env python3
+import json
+import os
+import sys
+import urllib.request
+
+def main():
+    if len(sys.argv) < 2:
+        print(json.dumps({"ok": False, "error": "missing title"}, ensure_ascii=False))
+        return
+
+    url = os.environ.get("N8N_TODO_WEBHOOK_URL")
+    if not url:
+        print(json.dumps({"ok": False, "error": "N8N_TODO_WEBHOOK_URL not set"}, ensure_ascii=False))
+        return
+
+    title = sys.argv[1]
+    due = sys.argv[2] if len(sys.argv) > 2 else ""
+    reminder = sys.argv[3] if len(sys.argv) > 3 else due
+
+    payload = {
+        "title": title,
+        "due": due,
+        "reminder": reminder,
+    }
+
+    req = urllib.request.Request(
+        url,
+        data=json.dumps(payload).encode("utf-8"),
+        headers={"Content-Type": "application/json"},
+        method="POST",
+    )
+
+    with urllib.request.urlopen(req, timeout=20) as resp:
+        print(resp.read().decode("utf-8", "ignore"))
+
+if __name__ == "__main__":
+    main()
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