Take subagent reports out of the main transcript, and separate turns with a rule

A row per finished background task is a screenful of dividers about work the
reader was not asking after, and one of them turned out to be a whole shell
command drawn as centred prose, because its words came from somewhere with no
reason to keep them short. `Event::TaskNote` is gone entirely, along with the
row that drew it. A subagent's closing report is recorded as that subagent's
own transcript's closing text and is read in the subcard, which is where it
was already going; what the parent gets a row for is a message a subagent
genuinely sends it, which arrives by the peer path and has had one all along.

What remains is the actual defect and the smallest thing that fixes it. The
fold still refuses to grow a settled reply, so a turn boundary is always a
message boundary, and where two replies then abut it puts a `TurnBreak`
between them: a hairline, no words, no colour. Made by the fold rather than
sent by the server, because it is not something that happened -- it is the
boundary between two things that did. `joinPages` puts one in at a page seam,
which the fold never gets to see.

The task notification is still what closes a task in `Status::Waiting`'s
bookkeeping, and the registry lookup that recognises one this translator never
saw start is what makes that work for a session adopted across a restart.

Verified on the emulator: three replies, three rules, and nothing about the
helpers anywhere in the parent. 170 server tests, 85 JVM tests, ktfmt, clippy,
rustfmt and Android lint clean.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
irisandClaude Opus 5 committed 2026-09-06 21:39:19 -04:00
1 parent ef1aad8776
commit 1bbb642973
13 files changed
+171 -407

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@@ -288,10 +288,6 @@ fun SessionScreen(
// Which messages from other agents are open, by the seq that identifies their row. Closed by
// default, which is the rule for anything new in this transcript.
var expandedNotes by remember { mutableStateOf(setOf<Long>()) }
// Which task reports are open, by the seq that identifies their row. Closed by default, which
// is the rule for anything new in this transcript -- and doubly so here, since what one opens
// onto is already in the subagent's own transcript.
var expandedTaskNotes by remember { mutableStateOf(setOf<Long>()) }
// Which memory notes are open, by the note's own text. Held here rather than in the card so a
// note opened and scrolled past is still open on the way back.
var openMemories by remember { mutableStateOf(setOf<String>()) }
@@ -1607,25 +1603,7 @@ fun SessionScreen(
is TranscriptItem.CompactedNote ->
CompactedRow(item)
is TranscriptItem.LimitNote -> LimitRow(item)
is TranscriptItem.TaskNote ->
TaskNoteRow(
item,
open = item.seq in expandedTaskNotes,
// Anchored, so the edge the reader pressed
// stays where it was.
onToggle = {
toggleAnchored(row) {
expandedTaskNotes =
if (
item.seq in
expandedTaskNotes
)
expandedTaskNotes - item.seq
else
expandedTaskNotes + item.seq
}
},
)
is TranscriptItem.TurnBreak -> TurnBreakRow()
// Never reached: a peer message is flattened into
// its own units. Here because a `when` over the
// item kinds has to stay exhaustive.