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111 lines
3.4 KiB
Markdown
111 lines
3.4 KiB
Markdown
# s07: Tasks (任务系统)
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`s01 > s02 > s03 > s04 > s05 > s06 | [ s07 ] s08 > s09 > s10 > s11 > s12`
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> *"State survives /compact"* -- 写进文件的状态, 压缩也杀不死。
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## 问题
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内存里的状态 (s03 的 TodoManager) 扛不住上下文压缩 (s06)。auto_compact 一跑, 消息被摘要替换, todo list 就没了。智能体只能从摘要文本里猜 -- 有损且容易出错。
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写到磁盘就不一样了: 文件状态能扛住压缩、进程重启, 后面还能给多个智能体共享 (s09+)。
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## 解决方案
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```
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.tasks/
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task_1.json {"id":1, "status":"completed", ...}
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task_2.json {"id":2, "blockedBy":[1], "status":"pending"}
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task_3.json {"id":3, "blockedBy":[2], "status":"pending"}
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Dependency resolution:
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+----------+ +----------+ +----------+
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| task 1 | --> | task 2 | --> | task 3 |
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| complete | | blocked | | blocked |
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+----------+ +----------+ +----------+
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| ^
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+--- completing task 1 removes it from
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task 2's blockedBy list
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```
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## 工作原理
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1. TaskManager: 每个任务一个 JSON 文件, CRUD + 依赖图。
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```python
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class TaskManager:
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def __init__(self, tasks_dir: Path):
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self.dir = tasks_dir
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self.dir.mkdir(exist_ok=True)
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self._next_id = self._max_id() + 1
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def create(self, subject, description=""):
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task = {"id": self._next_id, "subject": subject,
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"status": "pending", "blockedBy": [],
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"blocks": [], "owner": ""}
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self._save(task)
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self._next_id += 1
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return json.dumps(task, indent=2)
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```
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2. 完成任务时, 自动将其 ID 从其他任务的 `blockedBy` 中移除。
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```python
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def _clear_dependency(self, completed_id):
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for f in self.dir.glob("task_*.json"):
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task = json.loads(f.read_text())
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if completed_id in task.get("blockedBy", []):
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task["blockedBy"].remove(completed_id)
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self._save(task)
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```
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3. `update` 处理状态变更和依赖关联。
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```python
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def update(self, task_id, status=None,
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add_blocked_by=None, add_blocks=None):
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task = self._load(task_id)
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if status:
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task["status"] = status
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if status == "completed":
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self._clear_dependency(task_id)
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self._save(task)
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```
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4. 四个任务工具加入 dispatch map。
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```python
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TOOL_HANDLERS = {
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# ...base tools...
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"task_create": lambda **kw: TASKS.create(kw["subject"]),
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"task_update": lambda **kw: TASKS.update(kw["task_id"], kw.get("status")),
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"task_list": lambda **kw: TASKS.list_all(),
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"task_get": lambda **kw: TASKS.get(kw["task_id"]),
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}
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```
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从 s07 起, Task 是多步工作的默认选择。Todo 仍可用于快速清单。
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## 相对 s06 的变更
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| 组件 | 之前 (s06) | 之后 (s07) |
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|---|---|---|
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| Tools | 5 | 8 (`task_create/update/list/get`) |
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| 状态存储 | 仅内存 | `.tasks/` 中的 JSON 文件 |
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| 依赖关系 | 无 | `blockedBy + blocks` 图 |
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| 持久化 | 压缩后丢失 | 压缩后存活 |
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## 试一试
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```sh
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cd learn-claude-code
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python agents/s07_task_system.py
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```
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试试这些 prompt (英文 prompt 对 LLM 效果更好, 也可以用中文):
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1. `Create 3 tasks: "Setup project", "Write code", "Write tests". Make them depend on each other in order.`
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2. `List all tasks and show the dependency graph`
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3. `Complete task 1 and then list tasks to see task 2 unblocked`
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4. `Create a task board for refactoring: parse -> transform -> emit -> test`
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