fix(vscode): make subagent task headers collapsible - #13602
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marius-kilocode
enabled auto-merge
August 31, 2026 10:24
WebReflection
approved these changes
Aug 31, 2026
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What Problem This Solves
Opened subagents and async subagents hide the task-header collapse control because their transcripts are read-only. The expanded timeline takes space from the transcript, and an existing view does not receive changes to the main agent's saved timeline preference.
Why This Change Was Made
Collapsing the header changes presentation, not session content. Keep rename, compaction, and revert actions read-only while allowing the timeline toggle. Reuse the existing
showTaskTimelinesetting and configuration listener so the main agent, subagent inspector, and editor viewers stay in sync without a new preference.User Impact
Evidence
Matched screenshots from isolated VS Code with synthetic subagent transcripts. Before: the expanded header has no collapse control. After: the new control hides the timeline and applies the same state to the main agent. No live model requests were used.
Validated extension compilation, lint, typecheck, Knip, merge-marker guard, and formatting. All 51 focused regression tests and all 4,498 extension unit tests passed. Isolated UI checks covered regular and async subagent header toggles, synchronization with the parent, keyboard activation, and persistence after reload. Independent local review found no actionable issues.
Manual test: collapse the main agent header, open a regular or async subagent, and confirm it starts collapsed. Toggle the subagent header and confirm the main agent follows. Reload VS Code and confirm the saved state remains.