diff --git a/skills/calendar/scripts/cal_tool.py b/skills/calendar/scripts/cal_tool.py
index 0aa50f7..9c6fea5 100644
--- a/skills/calendar/scripts/cal_tool.py
+++ b/skills/calendar/scripts/cal_tool.py
@@ -19,6 +19,7 @@ Subcommands:
 """
 
 import argparse
+import shutil
 import subprocess
 import sys
 import uuid
@@ -98,14 +99,13 @@ def _strip_method(ics_bytes):
 
 
 def _parse_iso_datetime(dt_str):
-    """Parse ISO 8601 datetime string to a datetime object."""
-    # Handle both 2026-03-20T14:00:00 and 2026-03-20T14:00
-    for fmt in ("%Y-%m-%dT%H:%M:%S", "%Y-%m-%dT%H:%M"):
-        try:
-            return datetime.strptime(dt_str, fmt)
-        except ValueError:
-            continue
-    raise ValueError(f"Cannot parse datetime: {dt_str}")
+    """Parse ISO 8601 datetime string to a naive datetime object."""
+    try:
+        dt = datetime.fromisoformat(dt_str)
+        # Strip tzinfo if present — timezone is handled via --timezone / TZID param
+        return dt.replace(tzinfo=None)
+    except ValueError:
+        raise ValueError(f"Cannot parse datetime: {dt_str}")
 
 
 def _parse_date(date_str):
@@ -286,10 +286,7 @@ def _extract_ics_from_email(envelope_id, folder, account):
     ics_files = list(download_dir.glob("*.ics"))
     if not ics_files:
         print(f"Error: No .ics attachment found in envelope {envelope_id}", file=sys.stderr)
-        # Cleanup
-        for f in download_dir.iterdir():
-            f.unlink()
-        download_dir.rmdir()
+        shutil.rmtree(download_dir, ignore_errors=True)
         sys.exit(1)
 
     return ics_files[0], download_dir
@@ -391,9 +388,7 @@ def cmd_reply(args):
         print("=== Email Message ===")
         print(email_str)
         if cleanup_dir:
-            for f in cleanup_dir.iterdir():
-                f.unlink()
-            cleanup_dir.rmdir()
+            shutil.rmtree(cleanup_dir, ignore_errors=True)
         return
 
     # Send reply
@@ -414,9 +409,7 @@ def cmd_reply(args):
 
     # Cleanup
     if cleanup_dir:
-        for f in cleanup_dir.iterdir():
-            f.unlink()
-        cleanup_dir.rmdir()
+        shutil.rmtree(cleanup_dir, ignore_errors=True)
 
 
 # ---------------------------------------------------------------------------
@@ -485,19 +478,6 @@ def _urgency_label(days):
         return f"🟢 {days} 天后"
 
 
-def _find_todo_id(match_str):
-    """Find a todoman ID by matching summary text. Exits on 0 or >1 matches."""
-    todos = _todoman_list_json("--sort", "due")
-    matches = [t for t in todos if match_str in (t.get("summary") or "")]
-    if not matches:
-        print(f"Error: No todo matching '{match_str}'", file=sys.stderr)
-        sys.exit(1)
-    if len(matches) > 1:
-        print(f"Error: Multiple todos match '{match_str}':", file=sys.stderr)
-        for t in matches:
-            print(f"  - {t.get('summary')} (id: {t.get('id')})", file=sys.stderr)
-        sys.exit(1)
-    return matches[0]["id"]
 
 
 # ---------------------------------------------------------------------------
@@ -638,22 +618,9 @@ def cmd_todo_list(args):
 
 def cmd_todo_complete(args):
     """Mark a todo as done via todoman."""
-    if args.uid:
-        # todoman uses numeric IDs, not UIDs — search by UID in summary fallback
-        todos = _todoman_list_json("--sort", "due")
-        match = [t for t in todos if args.uid in (t.get("uid") or "")]
-        if not match:
-            print(f"Error: No todo with UID '{args.uid}'", file=sys.stderr)
-            sys.exit(1)
-        todo_id = match[0]["id"]
-    elif args.match:
-        todo_id = _find_todo_id(args.match)
-    else:
-        print("Error: --uid or --match is required", file=sys.stderr)
-        sys.exit(1)
-
+    todo_id, matched = _find_todo(uid=args.uid, match=args.match)
     _run_todoman("done", str(todo_id))
-    print(f"Completed todo #{todo_id}")
+    print(f"Completed todo: {matched.get('summary')}")
     _sync_calendar()
 
 
@@ -710,21 +677,9 @@ def cmd_todo_edit(args):
 
 def cmd_todo_delete(args):
     """Delete a todo via todoman."""
-    if args.uid:
-        todos = _todoman_list_json("--sort", "due")
-        match = [t for t in todos if args.uid in (t.get("uid") or "")]
-        if not match:
-            print(f"Error: No todo with UID '{args.uid}'", file=sys.stderr)
-            sys.exit(1)
-        todo_id = match[0]["id"]
-    elif args.match:
-        todo_id = _find_todo_id(args.match)
-    else:
-        print("Error: --uid or --match is required", file=sys.stderr)
-        sys.exit(1)
-
+    todo_id, matched = _find_todo(uid=args.uid, match=args.match)
     _run_todoman("delete", "--yes", str(todo_id))
-    print(f"Deleted todo #{todo_id}")
+    print(f"Deleted todo: {matched.get('summary')}")
     _sync_calendar()
 
 
@@ -746,6 +701,7 @@ def cmd_todo_check(args):
 
 def cmd_event_list(args):
     """List calendar events via khal."""
+    _sync_calendar()
     if args.search:
         cmd = ["khal", "search"]
         if args.format:
@@ -757,11 +713,16 @@ def cmd_event_list(args):
             cmd += ["--format", args.format]
         cmd += [args.range_start, args.range_end]
     try:
-        result = subprocess.run(cmd, capture_output=True, text=True, check=True)
-        print(result.stdout.rstrip())
-    except subprocess.CalledProcessError as e:
-        print(f"Error: khal failed: {e.stderr.strip()}", file=sys.stderr)
-        sys.exit(1)
+        result = subprocess.run(cmd, capture_output=True, text=True)
+        if result.returncode != 0:
+            # khal search returns 1 when no results found — not a real error
+            if args.search and not result.stderr.strip():
+                print(f"No events matching '{args.search}'.")
+                return
+            print(f"Error: khal failed: {result.stderr.strip()}", file=sys.stderr)
+            sys.exit(1)
+        output = result.stdout.rstrip()
+        print(output if output else "No events found.")
     except FileNotFoundError:
         print("Error: khal is not installed", file=sys.stderr)
         sys.exit(1)