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>
The Agent tool runs subagents in the background, so the parent's result
arrives at launch while the subagent works on for minutes; finishing on it
read a running agent as finished with a transcript cut off at launch. A
subagent now ends on its own message_delta end_turn, and a later line for a
finished one reopens it, since a background agent can be messaged again.
The card's expander row was only the chevron's height, so a tap for it
landed on the first subcard; it is the platform's 48dp minimum now.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
A subagent is a second transcript owned by a session, in the same event
model, with no process and no controls. The claude translator routes lines
carrying parent_tool_use_id to a per-subagent translator and transcript
under <session>/subagents/<tool_use_id>; three routes expose the list, a
transcript page and the SSE stream. Echo grows /subagent [n] as the rig.
On the phone a card with subagents ends in a chevron expander, collapsed by
default, opening to outlined subcards styled like dev-updater's components;
a subcard opens SessionScreen in read-only form, addressed through
TranscriptAddress so paging, cache and stream are shared.
Design in SUBAGENTS.md; choices awaiting review in DECISIONS.md.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
irisandClaude Opus 5