claudbg/.beans/claudbg-9c8r--tui-sub-agents-panel-in-transcript-view.md

title	status	type	priority	created_at	updated_at	parent	blocked_by
TUI: sub-agents panel in transcript view	completed	feature	normal	2026-03-30T04:47:15Z	2026-03-30T17:02:14Z	claudbg-i6l2	claudbg-rudq

Add a sub-agents panel to the right side of the transcript screen, showing all sub-agent runs for the current session.

Layout

┌── Transcript ──────────────────────┬─── Sub-agents ──┐
│ [user]: …                          │ a8e741de  agent  │
│ [assistant]: …                     │ > c3f920aa agent  │◄ selected
│ [tool: Bash] …                     │                  │
│ [tool_result]: …                   │                  │
└────────────────────────────────────┴──────────────────┘

The panel is ~25% of the frame width (or a fixed ~30 chars).

Implementation

• Use ratatui::layout::Layout with Constraint::Min for the chat area and Constraint::Length(30) for the panel.
• Panel shows: short agent ID + agent type. If the session has no sub-agents, the panel can be hidden or show "No sub-agents".
• Panel is focusable via Tab (Tab cycles: chat log → sub-agents panel → chat log).
• When panel is focused, j/k moves selection. Enter navigates to that sub-agent's transcript (sets screen to SubagentTranscript).
• Highlight the focused pane's border (e.g. with a colored Block border).

Data source

AppState.subagents: Vec<AgentRef> populated via discover_agents_for_session when entering transcript screen.

Blocked by

• transcript screen (claudbg-rudq)
• agent discovery fix (claudbg-33n0)

Summary of Changes\n\nModified render_transcript() to split chat area horizontally (Min(0) + Length(30)). Sub-agents panel shows agent list with yellow border/selection highlight when focused. Tab toggles focus. j/k navigates sub-agents when panel focused. Enter navigates to SubagentTranscript. Panel shows 'No sub-agents' when empty. 184 tests pass.