Action-Observation Cycle

01 · 快递接口回了 200，包裹却没出库01 · The shipping API returned 200; the parcel never left

如果系统只看“请求成功发送”就宣布完成，谁来发现 reserved = false，并决定重试还是转人工？If the system declares success after a request is sent, who notices reserved = false and decides whether to retry or hand off?

02注入“调用成功但业务失败”，校验真实观察后重试或转人工Inject “Call Succeeded, Business Failed,” Then Validate the Observation and Retry or Hand Off

行动 → 观察 → 校验 → 下一步act → observe → validate → next

状态 AMetric A

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状态 BMetric B

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状态 CMetric C

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所有概率、命中率、得分与输出均为固定种子的教学模拟，不代表真实模型。拖回主变量即可复核结论。All probabilities, hit rates, scores, and outputs are fixed-seed teaching simulations, not real model output. Move the main variable back to verify the conclusion.

03把刚才的变化拆成 4 个零件Break the Change into Four Parts

Action-Observation Cycle

ACTION

行动Action

调用 reserve_stock 改变外部状态。reserve_stock attempts to change external state.

TRANSPORT

调用层结果Transport result

HTTP 200 只表示请求被接收。HTTP 200 means only that the request was accepted.

OBSERVATION

业务观察Business observation

reserved 字段说明库存是否真的预留。reserved states whether inventory was actually reserved.

下一步Next action

校验后完成、修正重试或转人工。After validation: complete, retry with a fix, or hand off.

04最小机制：主交互能逐项验证Minimal Mechanism: Verify Each Link in the Interaction

MECHANISM

task_success = call_ok ∧ business_postcondition_ok

注入失败时 call_ok 仍为 true，而 reserved = false；完成门因此保持关闭，循环必须选择重试或转人工。When failure is injected, call_ok remains true while reserved = false. The completion gate stays closed, forcing a retry or handoff.

执行动作Act调用外部工具invoke external tool

读取观察Observe传输 + 业务状态transport + business state

校验决策Validate完成 / 重试 / 转人工complete / retry / hand off

05让 HTTP 200 与 reserved = false 同时出现Return HTTP 200 Together with reserved = false

主动制造失败Create a failure

边界实验Boundary experiment

这是最危险的“表面成功”。完成门必须读取业务后置条件，重试还要考虑 S7-13 幂等性。This is dangerous surface success. Completion must inspect the business postcondition, and any retry must consider S7-13 idempotency.

尚未执行。先在主交互中观察正常机制。Not run yet. Observe the normal mechanism in the main interaction first.

✗ HTTP 200 就代表任务完成。HTTP 200 means the task is complete.→ ✓ 还要检查业务后置条件 reserved。The reserved business postcondition must also pass.

✗ 业务失败就无限重试。Retry forever after a business failure.→ ✓ 应有次数、幂等性与转人工边界。Retries need limits, idempotency, and a human boundary.

✗ 观察只是写日志，不影响下一步。Observations are only for logs.→ ✓ 真实观察必须改变下一次决策。Real observations must change the next decision.

06 · 一句话带走06 · One line to keep

行动—观察循环必须把工具返回拆成调用状态与业务结果；只有后置条件通过才能完成，否则校验后重试或转人工。An action-observation cycle separates call status from business outcome. Completion requires the postcondition; otherwise validate, retry, or hand off.