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>
45 lines
2.3 KiB
Markdown
45 lines
2.3 KiB
Markdown
# Decisions awaiting review
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Choices made while working autonomously, for Bryan to keep or change. Each
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says what was picked and why; the detail is in the design doc it names.
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Delete an entry once it has been looked at.
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## Subagent views (2026-09-05, `SUBAGENTS.md`)
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Made on my own judgement, limited blast radius:
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1. **A subagent is a transcript, not a session.** It has no process,
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controls or settings; it is addressed as `/sessions/{id}/subagents/{sub}`
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and stored under the session's directory, so deleting the session takes
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it. Alternative rejected: registering it as a session of its own, which
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would give it a card in the main list and a driver that can do nothing.
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2. **Read-only view is the session screen minus its controls**, rather than
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a second, simpler transcript screen. Keeps paging, caching, selection
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and rendering in one place. Cost: a `readOnly` mode threaded through
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`SessionScreen`.
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3. **The list only carries a count.** Each session row says how many
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subagents it has; their titles and statuses are fetched when the card is
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expanded. Keeps `GET /sessions` from reading every subagent transcript.
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Consequence: an expanded card's statuses refresh with the list, not live.
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4. **Expanded/collapsed is remembered per session on the phone**, not on
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the server. Collapsed by default, per the transcript convention that new
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things arrive collapsed.
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5. **Subagents of imported sessions are not shown.** The import path still
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skips `isSidechain` records; the CLI's own `subagents/agent-*.jsonl` files
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are not read. Only subagents run while this backend was watching exist.
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6. **Echo grows `/subagent [n]`** as the test rig, so nothing here needs a
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paid turn to exercise.
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Deferred, because they reach further than this feature:
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- **Live status on the list.** Whether the session list should follow a
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stream at all (it refreshes on demand today) decides whether subagent
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status can ever be live there. Not changed.
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- **Nested subagents.** A subagent's own Task calls are shown as tool calls
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in its transcript and are not given transcripts of their own. Supporting
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that is the same mechanism one level down, but the UI would need nested
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expanders.
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- **The subagent status row says "context unknown".** Nothing measures a
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subagent's context; the row could leave it out rather than admit it.
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