T3 Code Sidebar V2: Inbox-Style Threads for Agentic Coding

How to Enable It

Go to Settings → Beta and flip the Sidebar V2 toggle. The sidebar switches layout instantly — no restart required — and you can switch back from the same place if you don't like it. Two more options appear underneath once it's on.

Key Takeaways

• Flat list, not a project tree. Active threads render as rich cards showing project name, thread age, thread title, and an activity indicator. Everything finished drops into a compact "Settled" list below.
• Auto-settle runs on a timer you control. Any thread with no activity for a set number of days settles automatically — the default is 3 days, and the number is editable. Threads on merged or closed PRs always settle on their own.
• Settling is reversible and self-correcting. New activity on a settled thread unsettles it automatically and pops it back to the top as a card. Manually, hovering a card exposes a settle button; hovering a settled row exposes an unsettle arrow.
• Snooze, for work you're not done with but don't want to see. The clock icon on an active card offers 1 hour, tomorrow at 9:00, or next week on Monday at 9:00.
• Right-click menu on any thread covers: start a new thread on main, unsettle, snooze, rename, mark as unread, and delete.
• The Settled section doesn't dump everything on you. It shows recent threads with a "show more" button that reports how many are still hidden, and the whole section collapses to a single line with a count.
• Project filter replaces project grouping. A dropdown at the top defaults to "All projects" and filters the whole list to one project instantly; an add-project button sits next to it.
• Search spans more than threads. Cmd+K opens a palette that searches commands, projects, and threads together, showing which project and branch each hit belongs to.
• New threads are two keystrokes. The compose button opens a project picker where every project gets its own shortcut (Cmd+1, Cmd+2, and so on).
• Beta, nightly-only. Expect rough edges — though the reviewer's take after testing was that it already feels solid and he saw no reason to switch back.

Shortcuts & Controls Shown

Settings → Beta → Sidebar V2      # enable (instant, no restart)
Settings → Beta → Auto settle     # settle after N days of no activity (default 3)
Cmd+K                             # search commands, projects and threads
Cmd+1 / Cmd+2 / ...               # compose a new thread in project 1, 2, ...
Hover card  → settle button       # manually settle an active thread
Hover card  → clock icon          # snooze 1 hour / tomorrow 9:00 / Monday 9:00
Hover row   → unsettle arrow      # bring a settled thread back as a card
Right-click → new thread on main | unsettle | snooze | rename | mark unread | delete

Why It Matters for Agentic Workflows

The reviewer's argument is that project-grouped navigation made sense when you had one or two projects, but it doesn't match how agentic coding actually runs: you fire off a batch of threads, some are still running, some are done, and the sidebar should reflect that state rather than acting as a folder tree. An inbox model where active work floats up and finished work settles down is a closer fit — and the auto-settle plus PR-close rules mean the sidebar cleans up after itself instead of accumulating.