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Order a session's subagents by activity, and delete finished ones by holding

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The subcards were oldest first, which buried whatever is working now. They
are ordered on the phone -- still running first, then most recently active --
over the server's stable oldest-first answer, since presentation order is a
display decision and a subagent that is thinking reports nothing meanwhile.

Holding a subcard selects it and several at a time, the import list's gesture
and its confirmation, so selecting is learned once. The selection bar sits
inside the session's card rather than at the bottom of the screen: it belongs
to one card, and one Delete is one request against one parent, so picking a
row in another card moves the selection rather than adding to it. Delete is
disabled, with the reason in words, while anything selected is still running
-- its transcript is still being written to and its process is the session's
to stop, so the server refuses that batch outright.

`POST /sessions/{id}/subagents/delete` takes the batch and checks every id
before removing any, so a set naming a running one is left exactly as it was
rather than half-deleted. It is `Subagents::start`'s path out. What counts as
running is shared with the list route through `has_a_process`, so the two
cannot disagree. On success the phone takes those rows out of that one card
and off the session's count, purges its cached copies, and drops the
expansion when nothing is left -- nothing else is refetched.

Driven on the emulator against the sandbox with ui-trace's new hold-by-name:
selecting two, the dialog, the rows going, a running one holding Delete
disabled, and the expander leaving with the last subagent.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
irisandClaude Opus 5 committed 2026-09-06 13:10:21 -04:00
1 parent cf10b17c5b
commit 13d2d11c2d
5 files changed
+506 -30
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app/androidApp/src/main/kotlin/com/example/aiapp/Api.kt
+20
View File
@@ -305,6 +305,26 @@ fun fetchSubagents(settings: ServerSettings, sessionId: String): List<SubagentSu
}
}
/**
* Removes finished subagents from their session, transcripts and all.
*
* All or nothing, and only for subagents that have finished: the server checks every id before it
* removes any, so a batch naming one that is still running leaves the whole selection as it was.
* One request for the batch, for the same reason [deleteImportable] is one -- sent row by row, a
* batch could half-arrive and the rows that were missed would look exactly like rows nobody picked.
*
* Unlike an import delete this is local file removal and is done by the time it returns, so there
* is no per-row state to follow afterwards.
*/
fun deleteSubagents(settings: ServerSettings, sessionId: String, subagentIds: List<String>) {
requestFromServer(
settings,
"/sessions/$sessionId/subagents/delete",
method = "POST",
jsonBody = JSONObject().put("subagents", JSONArray(subagentIds)).toString(),
) {}
}
// What the server offers, so the spawn screen has no hardcoded lists: a setup added to the server's
// config.ron appears here with no app rebuild.
//
app/androidApp/src/main/kotlin/com/example/aiapp/SessionListScreen.kt
+311 -20
View File
@@ -1,5 +1,6 @@
package com.example.aiapp
import androidx.activity.compose.BackHandler
import androidx.compose.foundation.ExperimentalFoundationApi
import androidx.compose.foundation.clickable
import androidx.compose.foundation.combinedClickable
@@ -17,8 +18,10 @@ import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.LocalContentColor
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedCard
import androidx.compose.material3.Switch
@@ -71,6 +74,24 @@ fun SessionListScreen(
mutableStateOf(mapOf<String, LoadState<List<SubagentSummary>>>())
}
// Which subagents the reader has picked out, and whose card they are in. One card at a time:
// a selection is deleted with one request against its parent session, so a set spanning two
// cards is not something one Delete could act on -- picking a row in another card moves the
// selection there rather than adding to it. Null means selection mode is off, since a
// selection with nothing in it is a mode with no controls and no way out but Back.
var subagentSelection by remember { mutableStateOf<SubagentSelection?>(null) }
// Which subagents have a delete in flight, and what a card's batch failed with. The same two
// states the session rows above keep, for the same reasons: the rows are rebuilt from whatever
// the server last said, and a failure is shown where it happened. The error is keyed by
// session, not by subagent, because the server takes a batch or refuses it whole.
var deletingSubagents by remember { mutableStateOf<Set<String>>(emptySet()) }
var subagentErrors by remember { mutableStateOf<Map<String, String>>(emptyMap()) }
// Deleting a subagent's transcript cannot be undone, so it is asked rather than done. Held as
// the rows themselves, not a flag, so the dialog can say what it is about.
var confirmingSubagents by remember { mutableStateOf<SubagentDeletion?>(null) }
fun loadSubagents(sessionId: String) {
subagentLoads = subagentLoads + (sessionId to LoadState.Loading)
scope.launch {
@@ -87,6 +108,15 @@ fun SessionListScreen(
}
}
/**
* Picks a subagent out, or puts it back; see [subagentSelection] for why one card at a time.
*/
fun toggleSubagent(sessionId: String, subagent: SubagentSummary) {
val picked = subagentSelection?.takeIf { it.sessionId == sessionId }?.ids.orEmpty()
val next = if (subagent.id in picked) picked - subagent.id else picked + subagent.id
subagentSelection = if (next.isEmpty()) null else SubagentSelection(sessionId, next)
}
// Failures that belong to one session rather than to the list, keyed by its id and shown on its
// own card. The two scopes are decided by whether the server answered: it answered and refused,
// so this says nothing about the other rows.
@@ -103,6 +133,73 @@ fun SessionListScreen(
val context = LocalContext.current
val transcriptCache = remember(settings) { TranscriptCache(cacheRoot(context, settings)) }
/**
* Removes [rows] from [sessionId]'s card, once the reader has confirmed it.
*
* One request for the batch rather than one per row -- see [deleteSubagents]. The selection is
* dropped as the work is handed over, not when it lands: the card goes back to how it started,
* and what says the work is happening is the rows it is happening to.
*/
fun deleteSubagentsIn(sessionId: String, rows: List<SubagentSummary>) {
val ids = rows.map { it.id }
val gone = ids.toSet()
subagentSelection = null
deletingSubagents = deletingSubagents + gone
subagentErrors = subagentErrors - sessionId
scope.launch {
try {
withContext(Dispatchers.IO) {
deleteSubagents(settings, sessionId, ids)
// After it succeeded, not before: a refused delete leaves those subagents
// exactly as they were, and this phone's copies of them still worth keeping.
gone.forEach {
transcriptCache.session(TranscriptAddress(sessionId, it)).purge()
}
}
// Only this card, and only what changed -- refetching the list instead put every
// other session back through a spinner to report something never in doubt. The
// count on the row is updated with it, because it is what decides the expander is
// there at all.
val loaded = subagentLoads[sessionId]
if (loaded is LoadState.Loaded) {
subagentLoads =
subagentLoads +
(sessionId to
LoadState.Loaded(loaded.value.filterNot { it.id in gone }))
}
val sessions = listState
if (sessions is LoadState.Loaded) {
listState =
LoadState.Loaded(
sessions.value.map {
if (it.id == sessionId)
it.copy(subagents = (it.subagents - gone.size).coerceAtLeast(0))
else it
}
)
}
// A card with none left has no expander to be open by, so the reader's choice to
// expand it goes too -- its path out, rather than a set holding an id that can
// never be drawn again.
val left =
(listState as? LoadState.Loaded)
?.value
?.firstOrNull { it.id == sessionId }
?.subagents ?: 0
if (left == 0) {
expandedSessions = expandedSessions - sessionId
subagentLoads = subagentLoads - sessionId
}
} catch (e: ApiException) {
// Kept, because they are still there: the server refused, so what it refused about
// is exactly as it was.
subagentErrors = subagentErrors + (sessionId to (e.message ?: "Delete failed"))
} finally {
deletingSubagents = deletingSubagents - gone
}
}
}
fun refresh() {
listState = LoadState.Loading
scope.launch {
@@ -135,6 +232,11 @@ fun SessionListScreen(
LaunchedEffect(reloadToken) { refresh() }
// Back leaves the subagent selection rather than the tab, which is the level it is one step
// above -- the same nesting the import list's own selection uses. Nested inside MainScreen's
// handler, so it wins only while there is a selection.
BackHandler(enabled = subagentSelection != null) { subagentSelection = null }
Box(Modifier.fillMaxSize()) {
Column(Modifier.fillMaxSize().padding(16.dp)) {
when (val state = listState) {
@@ -171,9 +273,25 @@ fun SessionListScreen(
onLongPress = { confirmingDelete = session },
expanded = session.id in expandedSessions,
subagents = subagentLoads[session.id],
subagentError = subagentErrors[session.id],
selectedSubagents =
subagentSelection
?.takeIf { it.sessionId == session.id }
?.ids
.orEmpty(),
deletingSubagents = deletingSubagents,
onSelectSubagent = { toggleSubagent(session.id, it) },
onDeleteSubagents = { rows ->
confirmingSubagents = SubagentDeletion(session.id, rows)
},
onToggleSubagents = {
if (session.id in expandedSessions) {
expandedSessions = expandedSessions - session.id
// A selection made in a card that is now collapsed has no
// rows on screen, so nothing would say what Delete acts on.
if (subagentSelection?.sessionId == session.id) {
subagentSelection = null
}
} else {
expandedSessions = expandedSessions + session.id
loadSubagents(session.id)
@@ -311,8 +429,75 @@ fun SessionListScreen(
},
)
}
confirmingSubagents?.let { pending ->
AlertDialog(
onDismissRequest = { confirmingSubagents = null },
title = {
Text(
if (pending.rows.size == 1) "Delete this subagent?"
else "Delete ${pending.rows.size} subagents?"
)
},
text = {
Text(
// One name is worth showing and twelve are not, so the count stands in for
// them -- the same shape as the import list's dialog. The sentence after it is
// the same either way, because what deleting costs does not change with how
// many.
(if (pending.rows.size == 1) "\"${pending.rows.first().title}\"\n\n" else "") +
"A subagent's transcript is the only record of what it did: the session " +
"that started it kept just the Task call. Nothing else has a copy, so " +
"this can't be undone. The session itself is untouched."
)
},
confirmButton = {
TextButton(
onClick = {
confirmingSubagents = null
deleteSubagentsIn(pending.sessionId, pending.rows)
}
) {
// Coloured by consequence, wherever it appears -- the same rule the session
// and import deletes above follow.
Text("Delete", color = MaterialTheme.colorScheme.error)
}
},
dismissButton = {
TextButton(onClick = { confirmingSubagents = null }) { Text("Cancel") }
},
)
}
}
/**
* The subagents picked out inside one session's card, and which card that is.
*
* Both together rather than a set beside a session id, which can disagree -- and the pair is what
* says a Delete has one parent to send itself to. See [SessionListScreen].
*/
private data class SubagentSelection(val sessionId: String, val ids: Set<String>)
/**
* A subagent delete waiting to be confirmed: which card, and the rows so the dialog can name one.
*/
private data class SubagentDeletion(val sessionId: String, val rows: List<SubagentSummary>)
/**
* The order a session's subagents are drawn in: the ones still working first, then most recently
* active.
*
* A display decision, made here rather than on the server, which answers oldest-first and is stable
* -- see UI_RULES. Two keys rather than activity alone because a subagent that is thinking has
* nothing to report meanwhile, and would sink below one that finished a moment ago; "still working"
* is what the reader is looking for at the top.
*/
private fun subagentOrder(rows: List<SubagentSummary>): List<SubagentSummary> =
rows.sortedWith(
compareByDescending<SubagentSummary> { it.status == "running" }
.thenByDescending { it.lastActivity }
)
@OptIn(ExperimentalFoundationApi::class)
@Composable
private fun SessionCard(
@@ -333,8 +518,16 @@ private fun SessionCard(
expanded: Boolean,
/** What the expander's own fetch answered, or null before it has been asked. */
subagents: LoadState<List<SubagentSummary>>?,
/** What deleting subagents from *this* card failed with, if it has. */
subagentError: String?,
/** Which of this card's subagents are picked out. Empty means selection mode is off here. */
selectedSubagents: Set<String>,
/** Every subagent with a delete in flight, whichever card it is in. */
deletingSubagents: Set<String>,
onToggleSubagents: () -> Unit,
onOpenSubagent: (SubagentSummary) -> Unit,
onSelectSubagent: (SubagentSummary) -> Unit,
onDeleteSubagents: (List<SubagentSummary>) -> Unit,
) {
BusyItem(label = if (deleting) "deleting" else null) {
Card(
@@ -433,13 +626,41 @@ private fun SessionCard(
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.error,
)
is LoadState.Loaded ->
subagents.value.forEach { subagent ->
is LoadState.Loaded -> {
val ordered = subagentOrder(subagents.value)
ordered.forEach { subagent ->
SubagentCard(
subagent,
selected = subagent.id in selectedSubagents,
// Any selection here makes a tap a selection too, so
// the reader is never one mis-tap away from leaving
// the list they were picking rows in.
selecting = selectedSubagents.isNotEmpty(),
deleting = subagent.id in deletingSubagents,
onClick = { onOpenSubagent(subagent) },
onSelect = { onSelectSubagent(subagent) },
)
}
// Beside the rows it acts on rather than at the bottom of the
// screen: this selection belongs to one card, and a bar down
// there would read as acting on whatever the screen last
// showed. See UI_RULES on a control belonging with its thing.
if (selectedSubagents.isNotEmpty()) {
val picked = ordered.filter { it.id in selectedSubagents }
SubagentSelectionBar(
picked = picked,
onDelete = { onDeleteSubagents(picked) },
)
}
}
}
// The server's own words, where the delete was asked for.
subagentError?.let {
Text(
it,
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.error,
)
}
}
}
@@ -453,26 +674,96 @@ private fun SessionCard(
* One subagent, indented inside its session's card -- the way dev-updater draws a project's
* components (`ComponentCard`, `UpdaterScreen.kt`): an outlined card, not the session card's own
* filled one, so the nesting reads as one step rather than as another session.
*
* Held rather than tapped to pick it out, and tapped to pick it out once anything here is picked --
* the import list's gesture, so selecting is learned once.
*/
@OptIn(ExperimentalFoundationApi::class)
@Composable
private fun SubagentCard(
subagent: SubagentSummary,
selected: Boolean,
/** Whether a selection is already open in this card, which makes a tap a selection. */
selecting: Boolean,
/** Whether this one is being deleted right now -- see [BusyItem]. */
deleting: Boolean,
onClick: () -> Unit,
onSelect: () -> Unit,
) {
BusyItem(label = if (deleting) "deleting" else null) {
OutlinedCard(
colors =
if (selected)
CardDefaults.outlinedCardColors(
containerColor = MaterialTheme.colorScheme.secondaryContainer,
contentColor = MaterialTheme.colorScheme.onSecondaryContainer,
)
else CardDefaults.outlinedCardColors(),
modifier =
Modifier.fillMaxWidth()
.combinedClickable(
// Off while the delete is in flight: a card that still opens a transcript
// it is deleting is a race the reader can start by tapping. On the card
// rather than in [BusyItem], which leaves gestures alone so the list still
// scrolls.
enabled = !deleting,
onClick = { if (selecting) onSelect() else onClick() },
onLongClick = onSelect,
),
) {
Column(Modifier.padding(horizontal = 12.dp, vertical = 8.dp)) {
Text(subagent.title, style = MaterialTheme.typography.titleSmall)
Spacer(Modifier.height(2.dp))
Row(modifier = Modifier.fillMaxWidth()) {
Text(
subagentStatusLabel(subagent.status),
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
modifier = Modifier.weight(1f),
)
Text(
relativeTime(subagent.lastActivity),
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
)
}
}
}
}
}
/**
* What can be done to the subagents that are selected: delete them, which is the only thing a
* subagent has ever had done to it here.
*
* Delete is **disabled**, not hidden, while anything selected is still running: a subagent's
* transcript is still being written to, and its process is its session's to stop -- so the server
* refuses that batch, and hiding the button would leave a reader holding a selection with no
* controls in it. The reason is in words beside it, because "we won't" and "there is nothing to do"
* are different in kind and no shade of a button says which.
*/
@Composable
private fun SubagentCard(subagent: SubagentSummary, onClick: () -> Unit) {
OutlinedCard(Modifier.fillMaxWidth().clickable(onClick = onClick)) {
Column(Modifier.padding(horizontal = 12.dp, vertical = 8.dp)) {
Text(subagent.title, style = MaterialTheme.typography.titleSmall)
Spacer(Modifier.height(2.dp))
Row(modifier = Modifier.fillMaxWidth()) {
Text(
subagentStatusLabel(subagent.status),
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
modifier = Modifier.weight(1f),
)
Text(
relativeTime(subagent.lastActivity),
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
)
}
private fun SubagentSelectionBar(picked: List<SubagentSummary>, onDelete: () -> Unit) {
val running = picked.count { it.status == "running" }
Row(
verticalAlignment = Alignment.CenterVertically,
modifier = Modifier.fillMaxWidth().heightIn(min = 48.dp),
) {
Text(
if (running == 0) "${picked.size} selected" else "$running still running",
style = MaterialTheme.typography.bodySmall,
color = MaterialTheme.colorScheme.onSurfaceVariant,
modifier = Modifier.weight(1f),
)
TextButton(onClick = onDelete, enabled = running == 0) {
Text(
"Delete",
// Coloured by consequence while it can act; the button's own disabled colour
// otherwise, so a red word does not promise something that will not happen.
color =
if (running == 0) MaterialTheme.colorScheme.error
else LocalContentColor.current,
)
}
}
}