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Thread transfer impact✅ Thread transfer remains within every enforced ceiling.
Baseline: Scenario and decoded snapshot size10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR introduces default-on, persisted thread grouping across the server, shared contracts, web sidebar, and mobile lists, including complex ordering, folding, drag/drop, and optimistic-update behavior. Its broad runtime surface and an unresolved medium-severity optimistic-ordering issue warrant human review. Not approved because:
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThis change adds persisted thread-group membership, assigns agent-launched threads to their caller, and adds group-aware layout, actions, and sidebar behavior on web and mobile. ChangesThread grouping
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MCPCaller
participant ProjectHandlers
participant ThreadLaunchService
participant Orchestrator
MCPCaller->>ProjectHandlers: Launch thread
ProjectHandlers->>ThreadLaunchService: Pass caller thread ID as group parent
ThreadLaunchService->>Orchestrator: Dispatch thread.create with group parent
Orchestrator-->>ThreadLaunchService: Create thread with group membership
Suggested reviewers: Merge Risk: ⚪ Minimal · up to No actionable issue remains from the reviewed changes; the PR is mergeable after normal checks. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/mobile/src/features/threads/threadListV2.ts:
- Around line 318-321: Remove "working" from the LIVE_LIST_SECTIONS set in
threadListV2.ts so groups topped by a working thread move to their first pinned
or active thread when one exists; groups containing only working threads should
remain in the Working shelf.
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📒 Files selected for processing (34)
apps/mobile/src/features/home/HomeRouteScreen.tsxapps/mobile/src/features/home/HomeScreen.tsxapps/mobile/src/features/home/useThreadListActions.tsapps/mobile/src/features/threads/ThreadArrangementSheet.tsxapps/mobile/src/features/threads/ThreadNavigationSidebar.tsxapps/mobile/src/features/threads/thread-list-v2-items.tsxapps/mobile/src/features/threads/threadListV2.test.tsapps/mobile/src/features/threads/threadListV2.tsapps/server/src/environment/ServerEnvironment.tsapps/server/src/mcp/OrchestratorMcpService.tsapps/server/src/mcp/OrchestratorMcpToolkit.integration.test.tsapps/server/src/mcp/toolkits/project/handlers.test.tsapps/server/src/mcp/toolkits/project/handlers.tsapps/server/src/orchestration-v2/Orchestrator.control-reads.test.tsapps/server/src/orchestration-v2/Orchestrator.tsapps/server/src/orchestration-v2/ProjectionStore.tsapps/server/src/orchestration-v2/ThreadLaunchService.tsapps/web/src/components/Sidebar.drag.test.tsapps/web/src/components/Sidebar.drag.tsapps/web/src/components/Sidebar.logic.test.tsapps/web/src/components/Sidebar.logic.tsapps/web/src/components/Sidebar.tsxapps/web/src/components/threadActionMenu.logic.test.tsapps/web/src/components/threadActionMenu.logic.tsapps/web/src/contextMenuFallback.tsapps/web/src/hooks/showThreadUndoNotice.tsdocs/user/thread-sidebar.mdpackages/client-runtime/package.jsonpackages/client-runtime/src/operations/commands.tspackages/client-runtime/src/state/models.tspackages/client-runtime/src/state/threadGroups.test.tspackages/client-runtime/src/state/threadGroups.tspackages/contracts/src/environment.tspackages/contracts/src/orchestrationV2.ts
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Hi, this is a really cool feature.
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Cool feature, I actually wanted to iterate on grouping too. My flow mostly is to group threads into initiatives/workstream (aka auth work, docs, release v1, etc), so I was trying to create some way for this to fit a bit more my workflow.
I prototyped this as named sections ( see fork branch: https://github.com/casassg/t3code/tree/gerardc/custom-sidebar-sections). Would you be open to groups optionally being named (a label instead of a top thread), so both flows share one system? Happy to send a follow-up on top of this PR if so. first time commenter here (and newer user), so let me know if there is a better productive way to bring/propose this. |
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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t3code/apps/web/src/components/Sidebar.tsx
Line 4178 in 0aa1422
Reordering a grouped thread clears the optimistic drop immediately, so the group snaps back before its order-key writes land. drop.order is built from the lead-only currentDropOrders, but reconciliation compares it with activeKeys or pinnedKeys, which include nested group members; this makes membershipChanged true. Reconcile against the same lead-only order used to build the drop.
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In file @apps/web/src/components/Sidebar.tsx around line 4178:
Reordering a grouped thread clears the optimistic drop immediately, so the group snaps back before its order-key writes land. `drop.order` is built from the lead-only `currentDropOrders`, but reconciliation compares it with `activeKeys` or `pinnedKeys`, which include nested group members; this makes `membershipChanged` true. Reconcile against the same lead-only order used to build the drop.

When an agent starts threads with T3 tools (or I split up a big piece of work), those threads land all over the sidebar. A "mobile app overhaul" turns into five unrelated-looking rows. Now related threads stay together as one group.
How it works
t3_thread_launchorcreate_threadsare grouped under the thread that started them.⌄ Ntoggle folds a group to the top thread plus a strip with one status dot per thread. A folded group still shows the open thread and any thread that needs you.Under the hood
One optional field,
groupedUnderThreadId, on the thread, shell,thread.create, andthread.metadata.update(null leaves the group). A group-only update keepsupdatedAt, since it is arrangement, not activity. The server rejects grouping a thread under itself. A newthreadGroupingcapability hides grouping actions against older servers. Web and mobile share one layout function inclient-runtime.Groups stay within one environment for now. Groups across machines are a follow-up.
Verification
updatedAt), and MCP launch grouping.Reviewed with sol-loop: 7 rounds with GPT-6.1-Sol on high. One fix (a parked group dropped into Active lands where it was dropped) was applied after round 6 at my request and was not re-reviewed by Sol; the review-bot follow-ups after it were.
Created with Claude Opus 5.5 in Claude Code.
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