feat(delegation): calm "will resume" affordance for background delegate_task - #52756
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alt-glitch
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Track top-level delegate_task work that dispatches in the background and
re-enters as a fresh turn. $backgroundResume returns {count, activity} for
the active session while idle — count of parked tasks plus the primary
child's latest stream line (tool/progress/thinking) when readable.
…te_task When idle with a top-level delegate_task still in flight, render a static, shimmering system-note at the transcript tail instead of a spinner (which reads as "stuck"). Reuses the shared steer / slash-status chrome (centered, 0.6875rem, muted, Codicon) so it sits in the thread like every other meta line, and mirrors the primary child's latest stream line, falling back to generic copy. i18n across en/ja/zh/zh-hant; markdown prose/heading rhythm tuned so a re-entered turn breathes.
… segment When idle with a background subagent still in flight, append a tail status segment spelling out that the agent resumes on its own. Width-budgeted like every tail segment, so it drops first on a tight terminal where the ⛓ count already carries the signal.
A top-level delegate_task dispatches in the background and re-enters as a fresh turn when done. Print a one-line dispatch-time note — no spinner, nothing to poll — so the idle prompt doesn't read as "nothing happened."
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Summary
A top-level
delegate_taskalready dispatches in the background and re-enters the conversation as a fresh turn when it finishes (tools/delegate_tool.py_model_background_value→ always background; result ridesprocess_registry.completion_queue). But while the subagent runs, the agent is genuinely idle yet every surface only showed an animated subagent indicator — which reads as "stuck, can't talk."This adds the Cursor-style "Will resume when the background task finishes" affordance: no spinner, nothing to poll, keep chatting. Same underlying signal — idle + background work in flight — on all three surfaces. Backend unchanged (already correct); this is purely presentation.
Changes
$backgroundResumePendingCount(running/queued subagents for the active session, zero while$busy) drives a staticBackgroundResumeNoticeat the transcript tail (the same slot as the response loader, so they never double up). i18n acrossen/ja/zh/zh-hant+ types.↩ resumes when subagent finishesstatus segment (drops first on a tight terminal where⛓ Nalready carries the signal)._on_tool_complete:↩ Background task running — I'll resume when it finishes. Keep chatting.Kept the composer status stack live-subagent rows (#44630) untouched — that's the deliberate watch/click-in surface, distinct from the main spinner that read as stuck.
Verifying the premise
Confirmed
delegate_taskis non-blocking onmain(so this is a UX gap, not a hang): existingtest_dispatch_returns_immediately_without_blocking,test_delegate_task_background_routes_async_and_does_not_block,test_run_agent_dispatch_forces_background, plus the desktop loader being gated onbusy.Test plan
tsctypecheck, eslint, vitest (background-delegation.test.ts, i18n parity, thread-loading)tsctypecheck, vitest (appChromeStatusRule.test.tsx, +4 new)test_async_delegation.py,test_cli_background_status_indicator.py, newtest_cli_delegate_background_notice.pydelegate_taskin the desktop app, confirm the idle "Will resume…" notice + usable composer, and that the result re-enters automatically