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science-agent-scheduling

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Use when a campaign is running and work must be dispatched, retried or throttled — when a shard sits in running with no heartbeat, when a lease expired and the result was duplicated, when retries storm the source APIs, when budget or concurrency must be cut mid-campaign, or when someone wants to fix a stuck task by editing state directly.

dsh-science/skills/science/science-agent-scheduling/SKILL.md

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Oct 25, 2026
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# 任务调度：租约、幂等与背压

## 一条总原则

**调度器是唯一能改状态的人。** 模型、脚本、人都不直接写 task 状态；
所有状态变化只由 `science_campaign_run` 的动作（claim / heartbeat / complete / fail /
release）产生。手工改 state 会让事件流与状态表对不上，之后每一次重跑都不可信。

## 租约（lease）

- 领取任务即获得租约，`leaseMs` 默认 120000（2 分钟）。
- 租约不是所有权，是**临时独占**；到期未续，任务自动回到 pending，任何人可再领。
- 领取前必须写 `owner`、`leaseUntil`、`attempt`。三项缺一，这次领取无效。
- 续租用 `heartbeat`，间隔取 `leaseMs/3`（约 40 秒）。不要等到快到期才续。
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