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feat(work-panel): show subagents as closable transcript tabs - #1027
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September 24, 2026 18:30
Clicking a delegation topology node replaced the whole work-panel tab strip with a single dock overlay, so parallel subagents could not be viewed side by side and every ended detail had to be reopened one at a time. Give subagents a first-class tab kind instead: each delegation opens (or activates) a normal closable tab keyed by its delegation id, so N subagents yield N coexisting tabs with the standard activate, reorder, close, and per-session persistence affordances. No tab opens automatically; ended delegates' tabs stay until closed. The tab renders the delegation as a conversation instead of a summary card: every Task call of the resume chain shows its prompt as a user row and the delegate's thinking, tool, and answer rows beneath it, reusing the main transcript's message-list language, so follow-up prompts read as the next user turn. A disabled two-row composer with an in-field read-only hint closes the tab; display-only by design, since the runtime has no renderer-to-delegate send path. Removes the subagentPanel overlay state, the dock takeover header, and SubagentPanel/SubagentDetail; delegation chain maps are now shared by the topology grouping and the new transcript builder. Specs and E2E plan updated (E2E-248); source-contract tests migrated to the tab model.
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What
Redesigns how subagent details are displayed in the work panel: the standalone dock overlay becomes a regular, closable work-panel tab (same mechanism as Review), and the tab content becomes a message-list style transcript with a read-only composer.
Why
Previously clicking a subagent node in the transcript replaced the entire work-panel tab strip with a single dock overlay ("independent side page"), so multiple subagents could not be viewed side by side and users had to reopen one subagent at a time (issue #917 feedback). The tab strip already supports many dynamic, reorderable, session-scoped tabs — subagents can simply be one more kind.
Behavior
subagenttab (subagent:<delegationId>); re-clicking an already-open subagent activates its tab. No tab is auto-opened when a subagent starts.explorer); duplicate names are disambiguated asexplorer#2,explorer#3, …Taskcall in the resume chain —user: task prompt→ delegate rows (toolrows, thinking, answer bubbles, markdown), matching the main MessageList visual language; follow-up prompts appear as additional user turns.subagentPaneloverlay state and actions,SubagentPanel/SubagentDetaildock surfaces, the panel takeover header/back button, and the transcript-search → subagent-panel focus handoff (the dock target no longer exists).Notes
Tests