feat(kimi-code): show live background agent activity in the /tasks panel - #2816
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Background agents (run_in_background or Ctrl+B) showed no run details: the /tasks panel only had static metadata, and its output view stays "[no output captured]" until completion because agent tasks capture output only once at the end. Tee child-agent events into a bounded in-memory per-agent activity store segmented by the engine's own turn.step.started events (recent 10 steps, bounded text/output tails). The /tasks preview pane now shows a live activity preview for agent tasks, and Enter/O opens a full-screen detail view rendering step-grouped Markdown text and per-tool results through the main transcript's renderers, with Ctrl+O to expand. Agent tasks without an in-memory record (e.g. lost after resume) fall back to the captured-output view.
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- drop delta-only arg buffers when their step is evicted - keep records of spawn-time background agents even when the task sync lags - mark records terminal on background.task.terminated for stopped agents that never emit subagent.failed
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Related Issue
No linked issue — the problem is explained below.
Problem
Background agents (subagents started with
run_in_background, or foreground ones backgrounded withCtrl+B) showed no run details in the TUI: the/taskspanel only displayed static metadata (agent id / type / model / effort), and its output view stays[no output captured]until the agent finishes, because agent tasks only capture output once at completion.What changed
turn.step.startedevents; only the most recent 20 steps are retained, with bounded assistant-text (4k chars) and tool-output (8k chars, marked with a truncation sentinel) tails./taskspreview pane: agent tasks now show a live plain-text activity preview (recent steps, tool calls with key argument and result chips, live output tail) instead of[no output captured], refreshed on selection and on the 1s poll.Enter/Oon an agent task opens a full-screen activity view: step-grouped assistant text rendered as Markdown and tool results rendered through the same per-tool result renderers / chips as the main transcript (the liveToolCallComponentitself is intentionally not reused — it is event-driven, this view renders a snapshot).Ctrl+Otoggles a global expand of all tool results, scrolling follows the tail, and the 1s refresh reads the local store only (no RPC).lostafter a session resume) fall back to the previous captured-output view unchanged.Checklist
gen-changesetsskill, or this PR needs no changeset.gen-docsskill, or this PR needs no doc update. — No doc update: the docs only reference/tasksas a one-line entry in the slash-command table ("Browse the background task list", still accurate); no existing page covers the panel's internals, so nothing is stale.Note: this PR also includes a test-only deflake commit for
acp-server(temp-dir cleanup now retries onENOTEMPTY). The race exists onmainand fires intermittently there, but this PR's new test files reshuffled shard timing enough to make it fire consistently on shard 2 — so it is fixed here to unblock CI.