diff --git a/wizard-work/quill/README.md b/wizard-work/quill/README.md
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+# todo.py
+
+Tiny CLI todo tracker. State is stored in `~/.todo.json`.
+
+## Usage
+
+```
+python todo.py add "buy milk"
+python todo.py list
+python todo.py all
+python todo.py done 1
+python todo.py done
+```
+
+## Commands
+
+- `add <text>` — append a task
+- `list` — show open tasks
+- `all` — show every task
+- `done [id]` — without id: show completed; with id: mark task done
diff --git a/wizard-work/quill/todo.py b/wizard-work/quill/todo.py
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+#!/usr/bin/env python3
+"""Tiny CLI todo tracker. Data lives in ~/.todo.json."""
+
+import argparse
+import json
+import os
+from datetime import datetime, timezone
+
+DEFAULT_PATH = os.path.expanduser("~/.todo.json")
+
+
+def load(path=DEFAULT_PATH):
+    if not os.path.exists(path):
+        return []
+    with open(path, "r", encoding="utf-8") as f:
+        return json.load(f)
+
+
+def save(items, path=DEFAULT_PATH):
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(items, f, indent=2)
+
+
+def cmd_add(args):
+    items = load()
+    entry = {
+        "id": max((i.get("id", 0) for i in items), default=0) + 1,
+        "task": args.task,
+        "done": False,
+        "created": datetime.now(timezone.utc).isoformat(),
+    }
+    items.append(entry)
+    save(items)
+    print(f"added {entry['id']}: {args.task}")
+
+
+def cmd_list(args):
+    items = load()
+    if args.done_only:
+        items = [i for i in items if i.get("done")]
+    elif not args.all:
+        items = [i for i in items if not i.get("done")]
+    for i in items:
+        status = "x" if i.get("done") else " "
+        print(f"[{status}] {i['id']}: {i['task']}")
+    if not items:
+        print("(none)")
+
+
+def cmd_done(args):
+    items = load()
+    for i in items:
+        if i.get("id") == args.id:
+            i["done"] = True
+            i["finished"] = datetime.now(timezone.utc).isoformat()
+            save(items)
+            print(f"done {i['id']}")
+            return
+    print(f"id {args.id} not found", flush=True)
+    raise SystemExit(2)
+
+
+def main():
+    p = argparse.ArgumentParser(description="Tiny todo CLI")
+    sub = p.add_subparsers(dest="cmd")
+    a = sub.add_parser("add")
+    a.add_argument("task", help="task text")
+    sub.add_parser("list", help="show todos")
+    sub.add_parser("all", help="show all including done")
+    sub.add_parser("done", help="show done only")
+    d = sub.add_parser("done")
+    d.add_argument("id", type=int, help="todo id to mark done")
+    args = p.parse_args()
+    if args.cmd == "add":
+        cmd_add(args)
+    elif args.cmd == "list":
+        cmd_list(args)
+    elif args.cmd == "all":
+        cmd_list(args)
+    elif args.cmd == "done":
+        if hasattr(args, "id"):
+            cmd_done(args)
+        else:
+            cmd_list(args)
+    else:
+        p.print_help()
+        raise SystemExit(1)
+
+
+if __name__ == "__main__":
+    main()