[Bug] In-session /tasks panel prematurely clears completed subagents without documented cleanup trigger

Bug Description
Subject: In-session subagent panel (/tasks) loses completed subagents faster than documented, and Ctrl+T has no pin effect there

What I'm seeing:

• I watch subagents via /tasks inside a single interactive session (not Agent View / claude agents).
• Completed background subagents drop out of the /tasks list shortly after I switch back

to the main session — well before I've had a chance to review their output.

• Pressing Ctrl+T to try to "pin" a subagent and keep it listed does nothing for it; it

only toggles Claude's to-do checklist, which isn't the feature I'm trying to use.

Expected behavior (per docs):

• sub-agents.md states a completed background subagent "stays listed in /tasks, marked

done and sorted below running work, until the session cleans up its task list" and that
"its detail view stays open when the subagent finishes." No timeout or
switch-back-triggered cleanup is documented.

• agent-view.md documents a Ctrl+T pin that exempts a background session from the ~1-hour

idle cleanup, but that's for Agent View (claude agents) rows, not in-session
subagents. There appears to be no equivalent pin/keep-alive control for the /tasks panel.

Ask:

1. Please clarify (or fix) exactly when/why the in-session /tasks list clears a completed

subagent — the current doc wording ("until the session cleans up its task list") is too
vague to tell if this is working as intended.

1. Consider adding a pin/keep-alive control for in-session subagents in /tasks, similar to

what Agent View already has for background sessions.

Environment Info

• Platform: darwin
• Terminal: xterm-256color
• Version: 2.1.219
• Feedback ID: 2301fcd1-9f3a-4b60-b5c9-52db5951490d