change-event-timeline

梳理事件发生顺序以识别关键转折点与可能因果链。

把相关事实按时间顺序铺开，找出关键转折点和最可能的因果链，分清长期背景事实和最近触发事件。当时间顺序对诊断很重要、需要判断哪个变化最可能引起结果时使用。输出会标出候选因果、验证问题和应关注的时间节点，方便后续取证和复盘。

# Change Event Timeline

Use this skill to find what changed, when it changed, and which change most likely matters.

## Method Notes

- Many diagnoses fail because they treat all facts as equally current.
- A timeline helps distinguish long-standing background facts from recent trigger events.
- The goal is to identify turning points, causal candidates, and validation questions.

## Required Inputs

Collect or infer these inputs before execution:

- situation or decision question
- key events and dates or approximate sequence
- before-state and after-state
- stakeholders involved in each event
- observed behavior, decision, metric, or risk change

If an input is missing, mark it as `unknown