docs(schedule): add subsystem reference
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docs/subsystems/schedule.zh.md
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# 仅限 Session 内的 Schedule
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[English](schedule.md) | 中文
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Schedule 拥有持久提醒;这些提醒会作为普通的后续对话轮次返回原 live Session。[持久 Schedule Agent Note](../../.agents/notes/implemented/feature/2026-08-05-durable-web-schedule.md) 负责持久化与生命周期决策,[对话式交付](../../.agents/notes/implemented/simplification/2026-08-09-conversational-schedule-delivery.md) 负责无回执边界。本页记录 [`packages/schedule/tool-schedule/src/types.ts`](../../packages/schedule/tool-schedule/src/types.ts) 中的持久数据形状和面向模型的数据形状;[包 README](../../packages/schedule/tool-schedule/README.md) 负责组合、工具行为与确切的提醒 framing。
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## 持久记录
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`ScheduleId` 是[品牌化 id](core.md#branded-ids),在单个 Session 内唯一且绝不复用。版本 1 最初只支持正的安全整数 `after_seconds` 选择器。创建操作会将选定目标规范化为使用四位年份的 RFC 3339 UTC `scheduledAt`;记录仍保留提交的延时,以便 list 结果说明生成该目标所用的规则。
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```ts type-equiv
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/** Durable one-shot reminder created from a positive delay. */
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interface AfterScheduleRecord {
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/** Session-local stable identity. */
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readonly id: ScheduleId
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/** Rule discriminator; v1 supports only delayed one-shot reminders. */
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readonly kind: 'after'
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/** Trimmed reminder content supplied at creation. */
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readonly prompt: string
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/** Positive safe-integer delay accepted at creation. */
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readonly afterSeconds: number
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/** Four-digit-year RFC 3339 UTC target. */
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readonly scheduledAt: string
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}
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```
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```ts type-equiv
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/** The v1 durable reminder record union. */
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type ScheduleRecord = AfterScheduleRecord
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```
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## 持久变更与回放
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版本 1 的 `schedule/change` 会话事件是 Schedule 唯一的持久权威。create 保存完整记录。delete 与 dispatch 是一次性提醒的终结性、仅含 id 的转换;dispatch 表示 follow-up 已同步入队,而不表示模型答复成功或用户已读取答复。
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```ts type-equiv
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/** Creates one durable reminder record. */
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interface ScheduleCreateChange {
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readonly version: 1
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readonly operation: 'create'
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readonly schedule: ScheduleRecord
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}
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```
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```ts type-equiv
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/** Deletes one currently active reminder. */
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interface ScheduleDeleteChange {
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readonly version: 1
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readonly operation: 'delete'
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readonly id: ScheduleId
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}
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```
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```ts type-equiv
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/** Records that one active one-shot reminder entered the durable dispatch history. */
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interface ScheduleDispatchChange {
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readonly version: 1
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readonly operation: 'dispatch'
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readonly id: ScheduleId
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}
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```
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```ts type-equiv
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/** Strict version-1 durable Schedule mutation union. */
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type ScheduleChange = ScheduleCreateChange | ScheduleDeleteChange | ScheduleDispatchChange
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```
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严格 decoder 与 fold 会拒绝未知版本、额外字段、重复使用的 id,以及针对非活动记录的 delete 或 dispatch 转换。普通 Session 折叠完整事件流。fork 只折叠 `SessionHeader.seedLength` 位置及其后的事件,因此保留历史,但不会接管父 Session 的活动提醒。`schedule/change` 声明和源码位置也编入[持久化目录](../persistence-catalog.md#schedulechange--log-only)。
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## 活动视图与管理
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工具值将持久记录与根据当前墙钟派生的交付状态组合起来。`session-local` 表示原 Session 必须处于 live 状态:不存在外部通知渠道或 cold Session scheduler。
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```ts type-equiv
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/** Current delivery timing derived from the durable record and wall clock. */
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type ScheduleState = 'scheduled' | 'overdue'
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```
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```ts type-equiv
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/** Fixed v1 delivery boundary: the original session must be live. */
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type ScheduleDeliveryMode = 'session-local'
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```
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```ts type-equiv
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/** Complete model-facing view of one active after reminder. */
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interface ScheduleView extends AfterScheduleRecord {
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/** Whether the target remains in the future. */
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readonly state: ScheduleState
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/** Reminder delivery never leaves the owning session. */
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readonly deliveryMode: ScheduleDeliveryMode
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}
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```
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生成的[工具目录](../tool-catalog.md#deepseek-aidsh-tool-schedule)负责 `schedule_create`、`schedule_list` 和 `schedule_delete` 的参数与结果 schema。一条 Agent-scoped 队列将管理调用与到期工作串行化。每次读取或判断都会先等待共享的 Session 持久化 barrier;create 与实际执行的 delete 在追加后还会再次等待。barrier 失败会报告 `persistence_uncertain`,而不是猜测 eager write 是否已提交。其他稳定错误代码是 `invalid_prompt`、`invalid_selector`、`invalid_rule`、`time_out_of_range`、`corrupt_schedule_log` 和 `internal_error`。
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## Live 交付
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进程内 owner 根据持久 fold 派生最早的 timer,并在每次有界等待后重新读取墙钟。cold Session 不执行任何工作;重新打开后会重建 timer,并使已经过去的目标进入 overdue 状态。overdue 提醒会先等待 Agent 完全 idle 并认领 maintenance phase,再重新折叠状态、将 `followup()` 排入队列并追加 dispatch。它绝不会调用 `steer()`,也绝不会中断当前轮次。
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获得准入的 follow-up 会启动一个普通的后续轮次,且只通过普通对话 transcript(文本记录)出现;Schedule 不提供独立的持久 Web 回执或浏览器渲染器。如果 framing 构造或同步队列准入失败,则不会记录 dispatch,提醒仍保持活动。follow-up 获得准入后、持久 dispatch 前的狭窄崩溃窗口可能使提醒在恢复后重复,因此该边界提供的是尽力而为的至少一次交付,而非恰好一次交付。
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