# -- TodoManager: structured state the LLM writes to -- class TodoManager: def __init__(self): self.items = [] def update(self, items: list) -> str: if len(items) > 20: raise ValueError("Max 20 todos allowed") validated = [] in_progress_count = 0 for i, item in enumerate(items): text = str(item.get("text", "")).strip() status = str(item.get("status", "pending")).lower() item_id = str(item.get("id", str(i + 1))) if not text: raise ValueError(f"Item {item_id}: text required") if status not in ("pending", "in_progress", "completed"): raise ValueError(f"Item {item_id}: invalid status '{status}'") if status == "in_progress": in_progress_count += 1 validated.append({"id": item_id, "text": text, "status": status}) if in_progress_count > 1: raise ValueError("Only one task can be in_progress at a time") self.items = validated return self.render() def render(self) -> str: if not self.items: return "No todos." lines = [] for item in self.items: marker = {"pending": "[ ]", "in_progress": "[>]", "completed": "[x]"}[item["status"]] lines.append(f"{marker} #{item['id']}: {item['text']}") done = sum(1 for t in self.items if t["status"] == "completed") lines.append(f"\n({done}/{len(self.items)} completed)") return "\n".join(lines) TODO = TodoManager()
