[lawrencecchen]

Summary

Step 2 of #28055 (P-RUST, R7: no permanent second path). The app holds no copy of acpmux's chat index. AcpmuxChatsStore (the mirror whose whole-dictionary copy and deep == on the main thread were the v2.2.9 hangs, base measurement in #28055) is deleted with its last readers:

• New Tab cards: a window over the index (newtab.cards: the newest 24 top-level chats, AgentPaneDeviceChat.maximumPushed). Only that window's messages push to the pages.
• Command palette chats page: a window (palette.chats) whose spec carries the query. acpmux ranks every chat with the palette's own ranker (cmux-palette-ranker, the crate the palette runs through its C ABI) over the same fields the page searched: title, folder and harness, every word anywhere, best match first. It answers the best 200 and the total that matched; when more match, the page's last row says so ("The best 200 of N matching chats. Type more to narrow."). The query's result ends after that answer (the spinner stops; an empty answer shows the empty state). The window closes with the page.
• Search (Cmd-Shift-A) and the Chats & agents scope: they list the same acpmux answer. A contributed page that answers its own queries (queryResults) has no providers, so the palette asks it for each query through one shared path (PaletteContributedAnswers in CmuxNextPalette), in a later turn than the key's (the chats' choice history is encoded off the main thread, and ChatsFeed encodes each request on the connection's serial queue).
  • Search: the chats show after the best ranked section (where the ranker put the best row), with every row the ranked rows leave under the 400-row page and at least their best 10 (taken from the weakest ranked rows when the page is full). A cut answer ends with a row that says how many more chats match and opens the Agent Chats page with the same query. Return runs the best ranked row of the current query; with no ranked row it waits for the chats answer. When rows above the selected one grow, the list scrolls to it.
  • Chats & agents scope: the chats lead the page, and its rows are not final until acpmux answers, so a Return runs the best chat, as on the chats page itself. No timer: without a connection, when acpmux refuses the query, or when its index is not ready (ready: false), the answer ends at once with no rows and Return runs the best agent session. When acpmux connects or its index fills the window, the shown query is asked again.
  • An older query's chats stay on screen only as stand-ins until the new answer replaces them: no key, click or Return selects them, and they are never final. An answer that ends empty (refused, not connected, no match) takes them off at once.
  • Leaving the page closes acpmux's window. A window asked again (reconnect, lag) is not answered until its full answer comes.
• Open Chat: _acpmux/chat_open now answers the chat itself with its plan. A running chat is found by its key (harness:sessionId).
• Cookie import requester: the caller's acpmux session lane by id, O(1). The lane now carries the summary's preview.
• ChatsFeed keeps the one connection, the windows and an index-change signal for the projects relay. The watch asks for a one-chat page, and its lines reach the main thread with no chat in them. This also fixes review F9 of Chats: acpmux owns the chat list; the sidebar history holds only its window (P0 stall) #28055 (one copy of the mirror per page).

#28055 has landed; the base is feat-cmux-next. After the base merges, the page moved from CmuxNextApp into CmuxNextAgentLanes (5e88f79) and AppServices holds the lane store (63702fa).

Behavior change: a harness name ("codex") and words that are not next to each other match as before, and a chat the person chose before ranks first among equal matches as before (the page sends its choice history of chats; acpmux ranks with the same palette ranker and the same frecency). The page shows the best 200 matches and says when more match; the empty query shows the newest 200 and says how many more chats there are ("N more chats. Type to search."). Known difference (lead decision): the relative-date text ("yesterday") is no longer searched; it is follow-up 2 in followups.md.

Changelog

Changed: Search Agent Chats shows the best 200 matching chats (or the newest 200) and says how many more there are; it no longer finds a chat by its relative date. In Search (Cmd-Shift-A), Agent Chats is its own section after the best match, in the order the chats index ranks them, and comes in a moment after the other rows; when the page is full it shows the best 10 and a row that opens Agent Chats with the rest.

Testing

• Rust: tests/chats_window.rs a_query_window_ranks_like_the_palette_and_reports_how_many_matched ("claude" finds every claude-code chat with total 30; "fix build" finds the 15 chats that hold both words) and window.rs unit tests ("codex" finds codex chats; non-adjacent words; the folder; an untitled chat). Red at 5c5380f, green at the head.

• Swift: AgentChatsPaletteAnswerTests (the stream ends after the first answer; the notice row past the page; untitled sent). Red at 833106b and 59af11d, green at the head.

• Swift: ChatsFeedHoldsNoIndexTests (a 3,000-chat watch page and one index change reach the main thread with no AcpmuxChat). Red at 1790b10, green at the head (job ids in a comment).

• Rust: tests/chats_open.rs chat_open_then_session_new_adopts_from_the_profile_store checks that the plan names its chat. Red at 1790b10, green at the head.

• Swift: ContributedAnswersTests (review 2 of the fix: a Return before the new query's rank runs its best row; a late chats answer keeps the selected best row first; the chats stay until the next answer replaces them; the Chats scope's Return waits for the chats) and aWindowIsNotAnsweredAgainUntilTheNewConnectionAnswers. Red at 26fb2bc, green at 184f853 (job ids in a comment).

• Swift: AgentChatsJoinSearchTests (Search and the Chats & agents scope, with the real AgentChatsPalettePage as the App contributes it, ask acpmux and list its chat). Red at 6150416, green at fdab8c7 with AgentChatsPaletteAnswerTests, CmdShiftASearchesEverythingTests and CmdPListsOpenItemsTests (job ids in a comment).

• Compile: cmux-ci compile-check --app --package CmuxNext --recipe-version 2 at the head.

• Lockfile: acpmux now depends on cmux-palette-ranker. The cmux-tui/Cargo.lock change (one line in the acpmux entry) is the output of cargo update -p cmux-palette-ranker --offline (rewrites the lock only, builds nothing), run on the base lock; it is byte-identical to the committed lock. cargo metadata --locked --offline --format-version 1 accepts the head's lock (exit 0) and refuses the base lock with the new dependency (exit 101).

Observed / Not run

Results of the jobs go in comments; the last ones are in issuecomment-6547205694 and the A/B comment.

Observed, STRESS A/B (bench build, 60-workspace STRESS session on a 1920x1200 virtual display, 3000 seeded chats, 220 typed keys of "idle" per side, same Mac cmux23, through the mini scheduler). Before = merge-base 25c1584 plus the bench harness (68c8e00), job 84b28b44de05d9aa3cbcd8c4. After = 8dc940d, job f7e2a0be41b5b9de9cc24c01:

signpost / metric (ms)	before p50 / p95 / p99 / max	after p50 / p95 / p99 / max
key round trip (debug.key)	1.492 / 5.739 / 6.443 / 6.775	1.498 / 5.249 / 6.021 / 6.42
key.palette_query_rows (edit to the frame with the final ranked rows)	9.115 / 12.379 / 13.422 / 15.354	8.959 / 13.442 / 18.437 / 22.767
longest main-thread stall while typing	0	0

Perf claim: none beyond #28055's counts. This is a correctness change. The table reports the A/B as it was measured; it is not a claim that the change makes Search faster or slower.

Not run:

• key.palette_query_answer (the edit to the frame that shows the chats answer) was not measured. No chats answer landed on either side, so that interval has no samples. Why acpmux gave no rows for the 3000 seeded chats is under investigation separately (diagnosis probe 9692561c9f3f8d03130e1e45). At the base, chats were ranked rows from the deleted mirror, so the base can have no answer frame.
• A GUI pass of the palette chats page, Search with live acpmux chats, and the New Tab cards.

No capture: the rows look the same; only their source changes.

---

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Summary by cubic

Deletes the app's mirror of acpmux's chat index (AcpmuxChatsStore) — the whole-dictionary copy and deep equality on the main thread behind the v2.2.9 hangs in #28055. Every reader now asks acpmux for the chats it needs, so the feed holds no chat of the index.

What changed

• New Tab cards read the newest 8 top-level chats from a window over the index; only that window's changes push to the pages.
• The palette's chats page is a query window: the spec carries the query, the person's chat choice history (frecency) and the page's untitled word. acpmux ranks with the palette's own ranker by title, folder and harness (every word anywhere; a chat chosen before ranks above an equal match) and answers the best 200 matches and how many matched; a last, disabled row says how many more matched than the page shows, in each locale's plural form.
• Search and the Chats & agents scope ask that page for each typed query (PaletteContributedAnswers). An answer shows only with the current query's ranked rows; an older query's answer is a stand-in that navigation never selects and never holds Return. A non-leading answer gets at least its best 10 rows in Search, and when the page cuts it, ends with a "more" row that says how many more match and opens the Agent Chats page with the query; in the Chats scope the chats lead, so Return waits for the best chat. A query's answer ends at once with no rows when acpmux is not connected, is not ready or refuses the window's request (an older spec's refusal is ignored), and there is no timer: every request ends with rows, with none, or when the query moves on. An answer that changes nothing delivers nothing — the skip compares the shown rows and the held state, so a re-answer with the same chats under new titles still reaches the screen — and shown and selectable rows cut the page at the same place. The page asks the shown query again when acpmux connects or its not-ready index fills the window.
• _acpmux/chat_open answers the chat itself with its plan; Open Chat and reveal find a running chat by its key (harness:sessionId).
• The cookie import requester reads the caller's acpmux session lane by id (O(1)); the lane now carries the summary's preview.
• The feed keeps one connection, the windows and an index-change signal for the projects relay; the watch asks for a one-chat page and its lines reach the main thread with no chat in them.
• Behavior change: the palette's chats page lists acpmux's best 200 rank matches per query instead of the app filtering every chat by title, key, harness, folder, accounts and roots.

Testing

• ChatsFeedHoldsNoIndexTests: a 3,000-chat watch page and one index change reach the main thread with no AcpmuxChat.
• AgentChatsPaletteAnswerTests and AgentChatsMoreChatsPluralsTests: a query stream ends after acpmux's first answer, and the more-notice row shows and pluralizes per locale.
• AgentChatsJoinSearchTests and ContributedAnswersTests: Search and the Chats & agents scope list the chats acpmux answers; old answers are never returned on, chats keep a minimum share of a full Search page (with a more row when cut), a missing, not-ready or refused answer never holds Return, a stale refusal is ignored, the page asks again when acpmux connects, navigation never stops on a stand-in, a retitled re-answer reaches the screen, and an empty answer with no stand-ins changes nothing.
• tests/chats_open.rs checks that _acpmux/chat_open names its chat in the plan; tests/chats_window.rs covers a query window's rank order (choice history, harness names, non-adjacent words) and its match total.
• cmux-ci compile-check passes at the head; palette-open-stages.py --search-keys times typed keys on Search to the frames that show the query's rows and its contributed answer (signposts key.palette_query_rows and key.palette_query_answer), seeding chats where acpmux's index reads them (transcripts under a temp HOME), asking the app's own acpmux for the word before typing and counting the chat rows each key shows; --vdisplay on a 1920x1200 virtual display so the STRESS window fits, report only, no CI.

^{Written for commit c568b63. Summary will update on new commits.}

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[lawrencecchen]

Review (claude-opus-review-subagent-4): FIX at 48c88de

Scope: the whole PR against merge-base 25c1584, and the repair 184f853..48c88de. Read only. I ran no build and no test. I read the three earlier FIX reviews (-6541340463, -6542219906, -6543785296) and the P2 comment from teamleaderleo.

Finding (fix before merge)

F1. Search shows at most 10 agent chats for every query, and nothing tells the person that more chats match.

• PaletteContributedAnswers.swift:124-126: withAnswers always cuts a non-leading answer to prefix(searchShare), and searchShare = 10 (:24). The cut applies also when the page has a lot of room. It is not only a reserve for a full page.
• The chats answer puts its notice row last (AgentChatsPalettePage.swift:91-93). The notice comes only when more than 200 chats match, so it is row 201 or later. prefix(10) always removes it. In Search the person never sees "The best N of M matching chats".
• Example: in Search (Cmd-Shift-A), type "build". 30 chats match, and 5 other rows rank. Search shows 10 chats. Chats 11 to 30 are not on the page, no row says that they exist, and the person cannot scroll to them. At the base, the chats were ranked rows (StaticPaletteProvider, base Handlers/AgentChatsPalettePage.swift:28), so all 30 showed within the shared 400-row page.
• No other Search section has its own cap. Workspaces, tabs, history (up to 500 entries), settings and commands share only the ranker's 400-row page (rank.rs:573). Thus the chats cap does not agree with the other sections. The earlier receipts passed R9 because "the limit shows the loss". In Search, this limit does not show the loss.
• The Changelog names "its best 10 matches". It does not name that chats past 10 cannot be reached from Search, or that the notice is lost.
• Fix: give the answer the room that the ranked rows leave, with searchShare as a minimum reserve: max(searchShare, pageRowLimit - rankedRows), and cut the weakest ranked rows only to keep that reserve. When the answer is cut, keep a disabled row that gives the count of chats not shown, as the chats page does. Add a test: 30 chats and a few ranked rows show all 30 chats. A full page shows the best 10 chats and the notice row. The test must fail at this head.

Checked, no defect found

• Earlier findings, all closed:
  • Review 1 F1: Search and the Chats & agents scope ask acpmux through PaletteContributedAnswers (PaletteModel+Search.swift:152).
  • Review 2 F1: the old ranked rows are not final. redeliverAnswers delivers only when rankedGeneration == generation (PaletteContributedAnswers.swift:93).
  • Review 2 F2: the chats go after the first ranked section, and the list scrolls when the selected row moves (:98-100).
  • Review 2 F3: the leading answer holds the rows (awaitsLead).
  • Review 3 F1: an old answer is a stand-in only. The reducer gets navRows(joined.selectable) (PaletteModel+Search.swift:350), so .select, .activate(rowID) and the default row never reach a stand-in (PaletteNavReducer.swift:65-69, :198-199). With no ranked row, held keeps the rows provisional while the answer is awaited (PaletteContributedAnswers.swift:110).
  • Review 3 F2: a full page keeps the best chats (trimmed, :128). See F1 above for the cap.
  • Review 3 M1: the answer ends at once without a connection, on a refusal, and on a request in flight when the connection drops (AgentChatsPalettePage.swift:102-112, AcpmuxChatWindows.swift:203-206, :224-229).
  • Review 3 M2: isAnswered checks !failed.contains (:271-276).
  • Review 3 M3: sidebar-search.md and the PR body are current (one doc nit below).
  • teamleaderleo P2: the reconnect and lag cases are covered by awaitingFull and failed in isAnswered.
• Return: in Search, Return runs the best ranked row of the current query. With no ranked row, it waits for the current answer or its bound. In the Chats scope, Return waits for the leading answer, and an empty, refused or disconnected answer releases it at once (noAnswer path, :70-77).
• Main thread: there is no sync wait on acpmux. The history is a value copy of the Sendable FrecencyStore that Task.detached(priority: .userInitiated) encodes (FrecencyStore+RankerHistory.swift:6-11). rankerHistory reads only that value. ChatsFeed encodes each request on the connection's serial queue.
• Lifetimes: leave cancels the answer and bound tasks and closes the window for every contributed page, before the committed check (PaletteModel+Highlight.swift:33-38). The hold task ends when its Task is cancelled (Task.sleep throws). A chosen chat closes the window.
• Mirror: git grep finds no reader of AcpmuxChatsStore, chatsFeed?.chats, chat(id:) or newest( in Packages.
• Red tests: the four new tests that the comment names failed on their assertions at 4a67df0. Each test reaches the repaired code. The two tests that passed at red guard only the palette side, as the comment says.
• Bench harness: --search-keys, --seed-chats and --stress only report. No file under .github/ or scripts/ci/ names palette-open-stages.py. It adds no CI step or gate.
• The signposts are not mirrored to MetricKit (SignpostMetricKitMirror.swift:47). edited does nothing when the key category is off.

Notes (do not block)

1. Bench (condition). Before SHIP, the STRESS A/B (bench build, 3000 seeded chats, 220 keys, 8776c7a against 48c88de) must show p50, p95, p99 and max for key.palette_query_rows and key.palette_query_answer. It must also show that the answers came (a count of rows= ends greater than 0), so the typed word must match the seeded chats ("Idle-cost chat "). A head after the F1 fix needs only the same bench at that head.
2. The 1.5 s holdLimit (PaletteContributedAnswers.swift:28, :80-85). Refusal and disconnect now end the wait with an event. The timer ends the wait only while a request is still in flight, and it then decides what Return runs. Example: at app launch, acpmux answers ready:false and fills the window when its index is ready. After 1.5 s, Return in the Chats scope runs the best agent session, and in Search with no ranked row it runs nothing. REVIEW-STANDARD rejects magic timeouts that have no measured reason. Use the bench's answer max to support the value, or remove the timer and wait for the in-flight request.
3. A refusal of an older request ends the current query. ChatsFeed.swift:157 calls requestFailed(window) with no generation check. A refusal of spec N (for example invalid_params for a query longer than 512 characters) that comes after spec N+1 was sent ends N+1's stream with no rows. It also marks N+1 failed, so its answer does not count. Refusals are rare (only invalid params or an internal error), but send the generation with the refusal and ignore an older one.
4. selectableRows checks only the count (PaletteModel+Keys.swift:298-302). On a full page (400 rows) that shows stand-ins, shown and selectable both have 400 rows, so selectableRows returns the shown rows, stand-ins included. Down at the row above the stand-in block then sends .select(standIn), the reducer refuses it, and the selection stays until the new answer lands. Compare the ids, not only the count.
5. refusals is pruned only when a refusal fires (AcpmuxChatWindows.swift:94-100). Each typed query adds an entry, and entries of dead tokens stay until the next refusal or disconnect. Prune in followRefusal, or in answered() as is done for the followers.
6. An answer that ended is not shown again after a reconnect. When the Cmd-K chats page opens while acpmux is not connected (for example at launch), it shows the empty state at once. It stays empty after the connection comes, until the person types. That is what review 3 M1 asked for. A refresh on connected would show the chats.
7. Doc nit. PaletteContributedAnswers.swift:12-14 still says that a Search answer "never holds the rows from being final". With no ranked row it holds them (:110).
8. The known follow-ups of the first receipts stay open (the relative-date search, ranking under the index lock, the New Tab substring filter).

[lawrencecchen]

Fix of review 4 (issuecomment-6546769110). Head 08f4143. The bench table follows in a later comment.

Commits:

• 20b3334: merge of origin/feat-cmux-next (the PR was DIRTY). One conflict, in ChatsFeed+Start.swift: I kept feat's SidebarPullRequestFixture start and the PR's lanes: services.agentLanes.
• a464fdd red: tests for F1 (a) and (b) and notes 2, 3, 4 and 6. The seams they call (PalettePageSpec.moreRow and onSourceChange, AcpmuxChatWindows.requestFailed(_:generation:), requestNotReady, followAvailability) do nothing at this commit.
• 0b331e6 fix:
  • F1: a non-leading answer gets every row that the ranked rows leave under the 400-row page, and at least 10. The extra rows come from the weakest ranked rows. A cut answer ends with its page's more row. The chats page's row says how many more chats match (the cut rows plus those past acpmux's 200) and opens Agent Chats with the same query. The page's own notice rows stay while nothing is cut. New string handlers.agentChats.moreInSearch ("More matching chats: %lld"), in all 21 locales.
  • Note 2: the 1.5 s timer is gone. acpmux's ready: false answer ends the query at once, as a refusal does. Every request now ends with rows, with none, or when the query moves on.
  • Note 3: ChatsFeed keeps each request's generation. A refusal or not-ready answer for an older spec is ignored.
  • Note 4: selectableRows filters by row id.
  • Note 5: follow and followRefusal drop dead entries when they add one.
  • Note 6: onSourceChange: the shown query is asked again when acpmux connects, or when an index that was not ready fills the window.
  • Note 7: the doc of PaletteContributedAnswers and sidebar-search.md are corrected.
• a895a65 test: the more-row test waits for the opened page without settle() (the opened page's query stays open), and End must move off the first row.
• 08f4143 bench: palette-open-stages.py --vdisplay HZ makes a 1920x1200 virtual main display, so STRESS's 1600x1000 window fits. The first scheduled run, job b9cd52e9a2a2458e514b919c at 20b3334, stopped in the STRESS build: cmux23's display left 963 pt under the menu bar and Dock (StressShapeError).

Fleet:

• Red at a464fdd, step 8e20239b8687dbdc993750d7 (aws-m4pro-6). These fail on their assertions:
  • F1 (a): thirtyChatsOnAPageWithRoomAllShow, 10 of 30 chats shown.
  • F1 (b): aFullPageShowsTheBestTenChatsAndTheMoreRow, no more row, and the page did not open.
  • Note 6: theSourceChangesWhenAcpmuxCanAnswer, 0 changes.
  • Note 3: anOlderRefusalDoesNotEndTheCurrentQuery, the answer was empty.
  • Note 2: aNotReadyAnswerEndsTheQueryAtOnce, the 60 s time limit.
• Red with the stronger note-4 test, at e2a2ada (a464fdd plus a895a65's test change), step 73ffff0e7b09581f28151f32 (aws-m4pro-6): endNeverStopsOnAStandIn fails, because End did not move. The F1 tests fail again.
• Green at a895a65, step e124a622b5cd370fc5882036 (aws-m4pro-2): 9 of 9 suites pass (ContributedAnswersTests, AgentChatsPaletteAnswerTests, AgentChatsJoinSearchTests, CmdShiftASearchesEverythingTests, CmdPListsOpenItemsTests, ChatsWindowMainThreadTests, ChatsFeedHoldsNoIndexTests, AgentChatsMoreChatsPluralsTests, SignpostsTests). The earlier green at 0b331e6 (step 7c21121def8afe5958b917b8) timed out in the more-row test; a895a65 fixes that test.
• Compile at 0b331e6, job 116c718f80cd5a2599cd2148: CmuxNext, the app and cmux-tui pass. a895a65 and 08f4143 change only a test and the bench script.
• Earlier: compile at the merge head 20b3334, job fc68224ce3b338344d92b59b, passed; green there, step 859e83bf8f3b5b096df70c3a, 9 of 9 suites passed.

[lawrencecchen]

STRESS A/B for the perf-hot PaletteModel.search path (review 4, note 1): bench build, the 60-workspace STRESS session on a 1920x1200 virtual display, 3000 seeded chats, 220 typed keys of "idle" per side, the same Mac (cmux23), through the mini scheduler.

• Before: merge-base 25c1584 plus the bench harness (68c8e00), job 84b28b44de05d9aa3cbcd8c4.
• After: 8dc940d, job f7e2a0be41b5b9de9cc24c01. The head 733bd91 adds only a bench-script diagnosis on top.

metric (ms)	before p50 / p95 / p99 / max	after p50 / p95 / p99 / max
key round trip (debug.key, includes search()'s main-thread turn)	1.492 / 5.739 / 6.443 / 6.775	1.498 / 5.249 / 6.021 / 6.42
key.palette_query_rows (the edit to the committed frame with the final ranked rows)	9.115 / 12.379 / 13.422 / 15.354	8.959 / 13.442 / 18.437 / 22.767
longest main-thread stall while typing	0	0

Not measured: key.palette_query_answer. No chats answer landed on either side (220 answer intervals were begun and none was ended). At the base, chats were ranked rows from the deleted mirror, so the base has no answer frame by design. At the head this means the app's acpmux gave no rows for "idle" over the 3000 seeded chats. A diagnosis probe (job 9692561c9f3f8d03130e1e45) asks the app's acpmux for its index state and matches. Following the lead's decision, this PR makes no perf claim for the answer frame and lands as a correctness change.

Not a result: the scheduled run at 20b3334 (job b9cd52e9a2a2458e514b919c) stopped in the STRESS build, because cmux23's display left 963 pt (fixed with --vdisplay).

[lawrencecchen]

Review (claude-opus-review-subagent-5): FIX at 733bd91

Scope: the whole PR against merge-base b0e10a0, and the repair 48c88de..733bd91 (a464fdd, 0b331e6, a895a65, 08f4143, 733bd91). Read only. I ran no build and no test. I read reviews -6541340463, -6542219906, -6543785296 and -6546769110, the fleet comment -6547205694, the A/B comment -6556134645, and the logs of jobs 84b28b44de05d9aa3cbcd8c4 (before) and f7e2a0be41b5b9de9cc24c01 (after).

Findings (fix before merge)

F1. Missing required measurement: the new answer path never ran, on the bench or in a GUI pass.

• Both A/B logs say answers landed: 0 and FAIL | Search chats answers | acpmux answered typed queries | 0 answers. key.palette_query_answer has n=0 on both sides. The PR body says that no GUI pass of Search, the Cmd-K chats page or the New Tab cards was run. Thus no run has shown one acpmux chat in Search at this code. The answer path is the replacement for the deleted mirror, so it is the main behavior of this PR.
• Probable cause: the seeding does not reach the chat index. seed_chats calls idle_cost_load.seed_store, which writes acpmux's own session store (<ACPMUX_HOME>/sessions/<id>/session.json, title Idle-cost chat <i>). The chat index scans only harness store roots (cmux-chat-index/src/roots/table.rs: ~/.claude/projects, ~/.codex, ...). cmux-chat-index/src/adapters/ has no adapter for acpmux's session store. If this is correct, the index had no "idle" chat on either side, and the label "3000 seeded chats" does not describe what was measured. The diagnosis job 9692561c9f3f8d03130e1e45 is still queued (placement_wait: 7 workers busy), so this is not confirmed.
• CLAUDE.md: "Measure on the fleet yourself, light and STRESS, before and after", as distributions. search() is perf-hot: 4ms palette-key. CLAUDE.md has no "no perf claim" exception for a perf-hot path. I did not find the lead's decision.
• Missing measurement: the same STRESS A/B, and a light A/B, at the base and at the head. Seed chats that the index holds (harness transcripts under a root it scans). The diagnosis must show window_total > 0 for the typed word at the head. Report key.palette_query_answer p50/p95/p99/max with n > 0 and a mean of answer rows > 0. Report key.palette_query_rows with the answer path active.

F2. key.palette_query_rows tail regression; this PR's code adds no-op deliveries to that interval.

• What the signpost spans: PaletteQueryFrameMarks.edited at the query edit (PaletteModel.swift, query setter), to the CommitBoundary after the frame that first shows the final ranked rows (PaletteContentView.swift:143-150, delivered(final:) in deliver). The bench ends it once per key for 220 keys.
• What the head adds on the main actor between the edit and that commit, for each key: the ask Task (PaletteContributedAnswers.swift:58), the history await resume and windows.open + ChatsFeed.send (AgentChatsPalettePage.swift:86-130), the drain that applies acpmux's answer, and then redeliverAnswers two times for an empty answer: once at the [] yield (PaletteContributedAnswers.swift:72) and once at stream end (:81). Each one is a full deliver: joined, recordShownDeferredItems, display (resultsVersion += 1, so list.setSections reloads up to 400 rows) and a reducer .results over navRows. With no answer rows and no stand-ins, nothing on screen changes, so both deliveries do no useful work. When the answer lands before the rank, redeliverAnswers returns at once (:104). When it lands after the rank's delivery and before the commit, the work goes into that frame. That agrees with p50 the same (9.115 to 8.959) and the tail higher (p95 12.379 to 13.442, p99 13.422 to 18.437, max 15.354 to 22.767).
• Not yet proven: there is one run per side, and p99 of 220 samples is about 3 samples. The head's STRESS build also logged a pane.focus timeout in refusals; the base did not log one. Thus the two sessions were not the same. The p95 was above the 10 ms frame budget on both sides. The rise is in a visible action ("a slow visible action" must not regress).
• Fix: do not redeliver when an answer changes nothing that is shown or held: no current or stand-in rows before and after, and held does not change. Do not redeliver two times for one empty answer. Then repeat the A/B with at least 2 runs per side (or interleaved runs), so that the p99/max change can be told from noise. Give the result together with F1's measurement.

Earlier findings: none came back

• Review 1 F1: Search and the Chats & agents scope ask the real page through contributed(...) (PaletteController+SearchPage.swift) and askContributions (PaletteModel+Search.swift:153).
• Review 2 F1: redeliverAnswers delivers only when rankedGeneration == generation (PaletteContributedAnswers.swift:104). Review 2 F2: a non-leading answer goes after the first ranked section, and scrollRequest keeps the selected row in view (:109-111). Review 2 F3: a leading answer holds the rows (awaitsLead).
• Review 3 F1: stand-ins go only into shown; the reducer gets navRows(joined.selectable). Review 3 F2 and review 4 F1: share = max(searchShare, room) (:142), the weakest ranked rows are trimmed (:158), and a cut answer ends with the page's more row (:146-152). The more-row count is notShown + (total - answered) (AgentChatsPalettePage.swift:50-54).
• Review 3 M1/M2 and review 4 notes 2-7: the 1.5 s timer is gone. ready: false ends the query at once (requestNotReady, AcpmuxChatWindows.swift:242-246; ChatsFeed.swift:103-104, 164-165; a stale answer is neither failed nor not ready). Refusals and not-ready answers of an older generation are ignored (:233-235, windowRequests keeps gen). isAnswered checks failed and awaitingFull. selectableRows compares ids (PaletteModel+Keys.swift). follow/followRefusal/followAvailability prune dead owners. onSourceChange asks the shown query again on connect and when a not-ready window fills (AcpmuxChatWindows.swift:204-209, 306).

Checked, no defect found

• Return in Search: the best ranked row of the current query. With no ranked row, Return waits for the current answer, and every request ends with rows, with none (refused, not ready, not connected, no match) or when the query changes. In the Chats scope: Return waits for the leading answer; an empty answer releases it at once.
• Stand-ins: never selectable, never the default row, never final. An answer that ends empty removes them (PaletteContributedAnswers.swift:76-79).
• No main-thread wait on acpmux. All reads are AsyncStreams. The history is encoded on a detached task from a value copy. Requests are encoded on the connection's serial queue. I found no data race.
• Lifetimes: leave cancels the answer tasks, clears the source tokens and closes palette.chats for every contributed page. .cancel(levelID) and didHide call it. If the person cancels during the history encode, no window opens (the isCancelled guard after the await). A push from the more row does not leave Search, and close is idempotent.
• Mirror: git grep finds no reader of AcpmuxChatsStore, chatsFeed?.chats, chat(id:) or newest( in Packages.
• Red tests: the seven tests of a464fdd call seams that do nothing at that commit, and they fail on their assertions (steps 8e20239b8687dbdc993750d7 and 73ffff0e7b09581f28151f32). They pass at a895a65 (step e124a622b5cd370fc5882036).
• Bench script: --search-keys, --seed-chats, --vdisplay and the diagnosis only report. No file under .github/ or scripts/ci/ names palette-open-stages.py or palette-open.sh. The script adds no CI step and no gate.

Notes (do not block)

1. Stale doc: PalettePageState.swift:36 still names PaletteContributedAnswers.holdLimit, which this repair deleted. The cubic summary in the PR body still says "every wait is bounded at 1.5 s".
2. The more-row count reads the live window (AgentChatsPalettePage.swift:51-53). When the person goes back from the pushed Agent Chats page, its onCancel closes palette.chats. If Search then redelivers, total is nil and rows is empty, so the row shows only notShown. The same occurs while a newer spec is in flight. Send the total with the answer instead.
3. On a full page that shows stand-ins, shown trims more ranked rows than selectable (the stand-ins use room only in the first withAnswers call, PaletteContributedAnswers.swift:124-126). Thus the reducer can keep the selection on a ranked row that is not on screen, and a Return then runs a row that the person cannot see. This needs a selection near the bottom of a 400-row page across a key, so it is rare.
4. The ChatsFeed wiring of the not-ready and generation fixes (Message.init notReady, windowRequests) has no test. The new tests call AcpmuxChatWindows directly. A decode test of {"result":{"window":"palette.chats","ready":false}} and of a stale answer would guard it.
5. The follow-ups that the first receipts named stay open: the relative-date search, ranking under the index lock, and the New Tab substring filter.

[lawrencecchen]

Review (claude-opus-review-subagent-6): FIX at 6745efb

Scope: the whole PR against merge-base 0e4ed40, and the repair 733bd91..6745efb (84b690b, 7ea1a33, 0525a8d, aeafd3c, b5ad89a, 04c407b, the merges e08a074 and 24939af, and 6745efb). I read reviews -6541340463, -6542219906, -6543785296, -6546769110 and -6556223157, the teamleaderleo P2, the PR body, and the logs of fleet steps 18f71a1f6c0aa1c8f4375ac1 and 9e19c1b1878a14e485b60be6. I ran no build and no test.

Lead decision applied: this PR lands as a correctness fix with no perf claim. The missing answer-path measurement (review 5 F1) is not a finding. The PR body reports the STRESS A/B as measured, says "Perf claim: none", and says that no chats answer landed on either side. That is honest.

Finding (fix before merge)

F1. The repair of review 5 F2 is not complete, and its own regression test fails on the fleet.

• answerFingerprint puts the awaited answers in the fingerprint: parts.append("awaited:" + ...) (PaletteContributedAnswers.swift:154). askContributions adds the section to awaitedAnswers before the rank starts (:54, called from PaletteModel+Search.swift:153). Thus the rank's own deliver records a fingerprint with awaited:agentChats (PaletteModel+Search.swift:284).
• When the answer ends empty (refused, not ready, not connected, or no match), the task removes the section from awaitedAnswers (PaletteContributedAnswers.swift:80). The fingerprint is now different, so redeliverAnswers (:120) does one full deliver: display (resultsVersion += 1, the list reloads up to 400 rows) and a reducer .results pass. In Search with at least one ranked row, held is false before and after (:137), so nothing on screen or in the Return state changes. This is the no-op delivery that review 5 F2 named. The repair takes it from two per key to one per key, not to zero. It is the case of the bench ("idle", no chat rows): one no-op delivery for each typed key.
• Fleet evidence: step 9e19c1b1878a14e485b60be6 (pr28090-green10) at 24939af (the head minus the test-only change of 6745efb in another file): ✘ Test anEmptyAnswerDeliversNothing() recorded an issue at ContributedAnswersTests.swift:323:9: Expectation failed: (palette.model.resultsVersion → 5) == (version → 4). The other 12 ContributedAnswersTests and all 11 AgentChatsPaletteAnswerTests pass there.
• The red step for this repair, 18f71a1f6c0aa1c8f4375ac1 at 84b690b, did not fail on assertions. It stopped at error: compile command failed due to signal 6 in AgentChatsPaletteAnswerTests.theMoreRowKeepsItsCountAfterTheWindowCloses(). Thus there is no red result yet for the five new tests (CLAUDE.md: record the red and the green of the same focused command).
• The cubic summary in the PR body says "An answer that changes nothing delivers nothing — no list reload and no reducer pass". At this head that is not true for Search.
• Fix: make the fingerprint hold what a delivery really changes, not the awaited set. For example: the answer sections' row ids in order, the query each answers, the held value that joined(...) computes for the current ranked rows, and the more-row count (counts.pastPage). Then an empty answer in Search with ranked rows is skipped, and a change of held still redelivers (Search with no ranked row, and the Chats scope's leading answer), so Return is still released at once. Then run the red (84b690b with the 04c407b/6745efb097c test edits) and the green on the fleet and post both step ids.

Earlier findings: none came back

• Review 1 F1: Search and the Chats & agents scope ask the real page (PaletteController+SearchPage.swift:73-78, askContributions). AgentChatsJoinSearchTests passes at 24939af.
• Review 2 F1/F2/F3: redeliverAnswers delivers only for rankedGeneration == generation (:119). A non-leading answer goes after the best ranked section, and the list scrolls when the selected row moves (:125-127). A leading answer holds the rows (awaitsLead).
• Review 3 F1/F2, M1-M3 and review 4 F1, notes 2-7: stand-ins only in shown; share = max(searchShare, room); no timer; ready:false and refusals end the query at once; an older generation's refusal is ignored; isAnswered checks failed and awaitingFull.
• Review 5 note 1: the awaitedAnswers doc no longer names holdLimit (PalettePageState.swift:36).
• Review 5 note 2: the more row reads PastPageCounts, recorded at answer time (AgentChatsPalettePage.swift:117, :52-54). theMoreRowKeepsItsCountAfterTheWindowCloses passes (55 = 5 cut + 50 past the page).
• Review 5 note 3: selectable is shown without the stand-in sections (PaletteContributedAnswers.swift:143-144); the stand-in's more row has the stand-in's section, so it is filtered too. navigationRowsAreAllOnScreenWithStandIns passes.
• Review 5 note 4: ChatsFeed.windowRequest(method:params:) is the same logic as before, and chatsFeedReadsNotReadyAndKeepsTheGeneration decodes ready:false, stale and an error.

Checked, no defect found

• Return: in Search it runs the best ranked row of the current query; with no ranked row it waits while awaitedAnswers holds the section, and each request ends (rows, none, not ready, refused, not connected, or the query moves on). In the Chats scope it waits for the leading answer. The awaited set is in the fingerprint, so no release of held is skipped at this head.
• Fingerprint coverage: row ids, their order and count, and the answered query are in it. Titles and the more-row count are not, but each answer also changes awaitedAnswers, and a re-ask from followSources always re-ranks and delivers, so no real change is skipped at this head. Keep that true in the F1 fix.
• Coalescing: scheduleRedelivery runs one main-actor hop per turn; a yield and the stream end in the same turn give one delivery. A key between the answer and the hop changes the generation, and the guard at :119 skips it.
• No main-thread wait on acpmux and no data race: answers are AsyncStreams; PaletteModel.rankerHistory reads frecency and now() on the main actor and encodes on a detached task (FrecencyStore+RankerHistory.swift:6-11); PastPageCounts is used only from main-actor closures.
• Lifetimes: leave cancels the answer tasks, drops the source tokens and closes palette.chats; a chosen chat closes the window; the scheduled hop holds the state weakly, and deliver returns for a page that is gone.
• Mirror: no reader of AcpmuxChatsStore, chatsFeed?.chats, chat(id:) or newest( in Packages.
• Test workaround: 04c407b and 6745efb only split try #require(x)(...) into two lines and write the closure parameter types. Every #expect and #require is unchanged.
• Bench: palette-open-stages.py and palette-open.sh are not named in .github/ or scripts/ci/. No CI step, gate or budget is added. The App change is one rows field in debug.palette.capture.
• Feat merges: 7552f82 keeps feat's sidebarRequiresOpen, turnPrompt, turnActivity and turnPlanStep with the PR's preview in AgentActivityLane, and feat's _acpmux/chats_search doc in server/chats.rs. e08a074 and 24939af join two lines of this branch, with no conflict. The diff against the merge-base touches only the PR's 52 files.

Notes (do not block)

1. The bench takes a PNG of the palette after each key (palette-open-stages.py:192, debug.palette.capture with path). That is main-thread work inside the debug.hangs window, so the "longest stall" figure includes the capture, not only the typing. A rows-only reply with no image would keep the measurement clean.
2. A stand-in section's more row reads counts.pastPage(state.query) for the new query, which has no count yet, so it shows only the cut rows until the new answer lands (PalettePageState.swift:195-200). It is not selectable and lasts one answer.
3. The PR body's Testing list does not name the five tests of 84b690b or their step ids.
4. The follow-ups of the first receipts stay open: the relative-date search, ranking under the index lock, and the New Tab substring filter.

[cubic-dev-ai]

18 issues found across 52 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="Packages/macOS/CmuxNext/Sources/CmuxNextSignposts/SignpostMetricKitMirror.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextSignposts/SignpostMetricKitMirror.swift:47">
P3: The new palette-query exclusion has no test. Add `#expect(!SignpostMetricKitMirror.mirrors(.paletteQueryRows))` and the `.paletteQueryAnswer` equivalent next to the existing `motionFrame`/`cefPump` checks so a future change cannot silently re-enable them.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Package.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Package.swift:1012">
P3: The dependency map comment above `CmuxNextAgentLanes` still lists only AgentActivity, Apps, Bridge, Sidebar and Wakeups. Add Palette (the chats palette page) and CmuxAgentBrands to that list so the comment matches the target.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Tests/CmuxNextPaletteTests/ContributedAnswersTests.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Tests/CmuxNextPaletteTests/ContributedAnswersTests.swift:89">
P2: `until` returns silently on timeout, and `answer`/`refuse` then do nothing when the ask never registered. Tests such as `anEmptyAnswerDeliversNothing` can pass without exercising the path they name. Have `until` report failure (for example `Issue.record` or a `#require` on the ask) when the condition never holds.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Sources/CmuxNextAgentActivity/AgentActivityLineConnection.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextAgentActivity/AgentActivityLineConnection.swift:91">
P3: The new `send(_ encode:)` runs the closure before checking whether the connection is still open. After `finish()` a request's JSON encoding is wasted work, and the closure's captured params stay alive until the queue drains. Check `!closed` before calling `encode()`.</violation>
</file>

<file name="cmux-tui/crates/acpmux/src/server/chats.rs">

<violation number="1" location="cmux-tui/crates/acpmux/src/server/chats.rs:216">
P2: The new `chat` field in the `_acpmux/chat_open` response is built with plain `chat_value`, so it omits `attention`, `preview` and `parent`. Every other chat value this module returns is decorated with them via `hub.chat_activity()`. Compute the activity before `blocking` (as `page` does) and decorate the value here.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/FrecencyStore+RankerHistory.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/FrecencyStore+RankerHistory.swift:15">
P3: The doc says this keeps picks that "begin `query`", but the filter keeps picks whose stored prefix the query begins with. Reword it to match the predicate.</violation>
</file>

<file name="scripts/cmux-next/palette-open-stages.py">

<violation number="1" location="scripts/cmux-next/palette-open-stages.py:56">
P3: `--seed-chats` and `--stress` do nothing unless `--search-keys` is also given, and nothing reports that. Reject them with a parser error when `--search-keys` is absent.</violation>

<violation number="2" location="scripts/cmux-next/palette-open-stages.py:194">
P3: The final answer wait happens after the last row capture, so late chat answers are omitted from `CHAT_ROWS` and can falsely fail the seeded benchmark. Capture the palette again after this wait and update the final key's count.</violation>

<violation number="3" location="scripts/cmux-next/palette-open-stages.py:317">
P3: Each `--seed-chats` run leaves its seeded HOME under /tmp because `cleanup()` never removes it. Track the directory and remove it in `cleanup()`.</violation>

<violation number="4" location="scripts/cmux-next/palette-open-stages.py:470">
P3: A missing chat-index precondition does not stop the benchmark: this branch records a failure and then `search_report` still measures. Raise or return after the failed check so invalid runs cannot produce timing samples.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/AgentChatsJoinSearchTests.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/AgentChatsJoinSearchTests.swift:61">
P3: This spins on `Task.yield()` up to 500 times to wait for acpmux's request, so the result depends on scheduler timing rather than a deterministic signal. Prefer an explicit signal from the fake `connected` send closure (e.g. an `AsyncStream` or continuation resumed on the matching request) so the test does not depend on how many turns the palette takes.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteModel+Search.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteModel+Search.swift:285">
P2: `held` never reaches `awaitsRank` or the spinner. A chats query with no ranked rows and an answer still pending shows "No Results" until acpmux answers. Set `awaitsRank` from `held` as well as `provisional`.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteQueryFrameMarks.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteQueryFrameMarks.swift:32">
P3: `pendingAnswer` records the raw answer count, not the answer rows actually rendered. Pass the count from the joined/displayed sections so `rows=<n>` reflects what is on screen after Search's share limit and More row.</violation>
</file>

<file name="cmux-tui/crates/acpmux/src/chats/window.rs">

<violation number="1" location="cmux-tui/crates/acpmux/src/chats/window.rs:287">
P2: `ranked_rows` materializes and retains a full `Value` for every matching chat before applying the window limit, so each query's memory and serialization work scales with the entire index despite returning at most 200 rows. Keep lightweight rank candidates for all matches, then build decorated chat values only for the selected indices.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PalettePageState.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PalettePageState.swift:181">
P2: Reloading a contributed page clears its answer rows but leaves `answeredQuery` set, so the next search skips `askContributions` and never restores those rows. Reset `answeredQuery` whenever `cancelAnswers()` clears the answer state.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/ChatsFeedHoldsNoIndexTests.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/ChatsFeedHoldsNoIndexTests.swift:33">
P3: This test passes whenever the watch page decodes to anything without chats, including `nil`, so it does not confirm the page was handled as the watch answer. Assert the decoded case directly, e.g. `#expect(message == .watching)`, before the chat count.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteContentView.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteContentView.swift:148">
P2: The answer signpost ends with the message-only overload, so a `CommitBoundary` that fires as `.missed` is recorded as a real commit. Rows ends via the outcome-aware overload and get `commit=missed`. Pass `outcome` for the answer too, and add an outcome+message overload to `Signposter` so the `rows=` detail is kept.</violation>
</file>

<file name="Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/AgentChatsMoreChatsPluralsTests.swift">

<violation number="1" location="Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/AgentChatsMoreChatsPluralsTests.swift:20">
P2: The `2,999` case asserts a thousands separator that `moreChats` probably does not produce. The count is a plain `%lld` interpolation, so the row likely reads `2999 more chats`. Either assert the actual output or drop this case.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

View guided diff | Turn on auto-fix | Re-trigger cubic</sub>

[cubic-dev-ai]

P2: The answer signpost ends with the message-only overload, so a CommitBoundary that fires as .missed is recorded as a real commit. Rows ends via the outcome-aware overload and get commit=missed. Pass outcome for the answer too, and add an outcome+message overload to Signposter so the rows= detail is kept.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteContentView.swift, line 148:

<comment>The answer signpost ends with the message-only overload, so a `CommitBoundary` that fires as `.missed` is recorded as a real commit. Rows ends via the outcome-aware overload and get `commit=missed`. Pass `outcome` for the answer too, and add an outcome+message overload to `Signposter` so the `rows=` detail is kept.</comment>

<file context>
@@ -139,6 +140,14 @@ final class PaletteContentView: NSView {
+            if marks.rows != nil || marks.answer != nil {
+                CommitBoundary().after { outcome in
+                    if let rows = marks.rows { Signposter.key.end(.paletteQueryRows, rows, outcome) }
+                    if let answer = marks.answer { Signposter.key.end(.paletteQueryAnswer, answer.interval, message: "rows=\(answer.rows)") }
+                }
+            }
</file context>

[cubic-dev-ai]

P2: The 2,999 case asserts a thousands separator that moreChats probably does not produce. The count is a plain %lld interpolation, so the row likely reads 2999 more chats. Either assert the actual output or drop this case.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/AgentChatsMoreChatsPluralsTests.swift, line 20:

<comment>The `2,999` case asserts a thousands separator that `moreChats` probably does not produce. The count is a plain `%lld` interpolation, so the row likely reads `2999 more chats`. Either assert the actual output or drop this case.</comment>

<file context>
@@ -0,0 +1,40 @@
+    }
+
+    @Test(arguments: [(1, "1 more chat. Type to search."), (2, "2 more chats. Type to search."),
+                      (2_999, "2,999 more chats. Type to search.")])
+    func theEnglishRow(count: Int, expected: String) throws {
+        let english = try table("en")
</file context>

[cubic-dev-ai]

P2: until returns silently on timeout, and answer/refuse then do nothing when the ask never registered. Tests such as anEmptyAnswerDeliversNothing can pass without exercising the path they name. Have until report failure (for example Issue.record or a #require on the ask) when the condition never holds.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Packages/macOS/CmuxNext/Tests/CmuxNextPaletteTests/ContributedAnswersTests.swift, line 89:

<comment>`until` returns silently on timeout, and `answer`/`refuse` then do nothing when the ask never registered. Tests such as `anEmptyAnswerDeliversNothing` can pass without exercising the path they name. Have `until` report failure (for example `Issue.record` or a `#require` on the ask) when the condition never holds.</comment>

<file context>
@@ -0,0 +1,346 @@
+    }
+
+    /// Waits until `check` holds (an answer lands on a later main-actor turn), or gives up.
+    static func until(_ check: () -> Bool) async {
+        for _ in 0..<500 where !check() { await Task.yield() }
+    }
</file context>

[cubic-dev-ai]

P2: The new chat field in the _acpmux/chat_open response is built with plain chat_value, so it omits attention, preview and parent. Every other chat value this module returns is decorated with them via hub.chat_activity(). Compute the activity before blocking (as page does) and decorate the value here.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At cmux-tui/crates/acpmux/src/server/chats.rs, line 216:

<comment>The new `chat` field in the `_acpmux/chat_open` response is built with plain `chat_value`, so it omits `attention`, `preview` and `parent`. Every other chat value this module returns is decorated with them via `hub.chat_activity()`. Compute the activity before `blocking` (as `page` does) and decorate the value here.</comment>

<file context>
@@ -208,8 +209,12 @@ pub(super) async fn route(
+                    .map_err(RpcError::invalid_params)?;
+                // The chat itself (title, folder, harness), so a client that opens it holds no
+                // copy of the index to name it.
+                plan.set("chat", crate::chats::chat_value(&chat));
+                Ok(plan)
             })
</file context>

[cubic-dev-ai]

P2: held never reaches awaitsRank or the spinner. A chats query with no ranked rows and an answer still pending shows "No Results" until acpmux answers. Set awaitsRank from held as well as provisional.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteModel+Search.swift, line 285:

<comment>`held` never reaches `awaitsRank` or the spinner. A chats query with no ranked rows and an answer still pending shows "No Results" until acpmux answers. Set `awaitsRank` from `held` as well as `provisional`.</comment>

<file context>
@@ -272,13 +274,26 @@ extension PaletteModel {
+        state.rankedComplete = complete
+        let joined = Self.joined(sections, state: state)
+        state.deliveredAnswerFingerprint = Self.answerFingerprint(state)
+        let held = joined.held
+        let sections = joined.shown
         state.lastSections = sections
</file context>

[cubic-dev-ai]

P3: --seed-chats and --stress do nothing unless --search-keys is also given, and nothing reports that. Reject them with a parser error when --search-keys is absent.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At scripts/cmux-next/palette-open-stages.py, line 56:

<comment>`--seed-chats` and `--stress` do nothing unless `--search-keys` is also given, and nothing reports that. Reject them with a parser error when `--search-keys` is absent.</comment>

<file context>
@@ -32,6 +52,10 @@
 parser.add_argument("--json", help="write the samples here")
 parser.add_argument("--no-gate", action="store_true", help="report only; exit 0 when every open was timed")
+parser.add_argument("--search-keys", help="time typed keys of this word on Search (Cmd-Shift-A), not palette opens")
+parser.add_argument("--seed-chats", type=int, default=0, help="stored chats in the app's acpmux store (--search-keys)")
+parser.add_argument("--stress", action="store_true", help="build the STRESS session before typing (--search-keys)")
+parser.add_argument("--vdisplay", type=float, help="run on a 1920x1200 virtual main display at this refresh rate (Hz)")
</file context>

[cubic-dev-ai]

P3: This spins on Task.yield() up to 500 times to wait for acpmux's request, so the result depends on scheduler timing rather than a deterministic signal. Prefer an explicit signal from the fake connected send closure (e.g. an AsyncStream or continuation resumed on the matching request) so the test does not depend on how many turns the palette takes.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/AgentChatsJoinSearchTests.swift, line 61:

<comment>This spins on `Task.yield()` up to 500 times to wait for acpmux's request, so the result depends on scheduler timing rather than a deterministic signal. Prefer an explicit signal from the fake `connected` send closure (e.g. an `AsyncStream` or continuation resumed on the matching request) so the test does not depend on how many turns the palette takes.</comment>

<file context>
@@ -0,0 +1,88 @@
+        palette.model.send(.setQuery("zebra"))
+        await palette.model.settle()
+        // The page is asked in a later turn than the key's, after the choice history is encoded off main.
+        for _ in 0..<500 where !sent.contains(where: { $0["query"] as? String == "zebra" }) { await Task.yield() }
+        let asked = sent.last { $0["window"] as? String == AgentChatsPalettePage.window }
+        #expect(asked?["query"] as? String == "zebra", "Search asks acpmux for the query: \(sent)")
</file context>

[cubic-dev-ai]

P3: pendingAnswer records the raw answer count, not the answer rows actually rendered. Pass the count from the joined/displayed sections so rows=<n> reflects what is on screen after Search's share limit and More row.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Packages/macOS/CmuxNext/Sources/CmuxNextPalette/PaletteQueryFrameMarks.swift, line 32:

<comment>`pendingAnswer` records the raw answer count, not the answer rows actually rendered. Pass the count from the joined/displayed sections so `rows=<n>` reflects what is on screen after Search's share limit and More row.</comment>

<file context>
@@ -0,0 +1,45 @@
+            self.rows = nil
+        }
+        if answerRows > 0, let answer {
+            pendingAnswer = (answer, answerRows)
+            self.answer = nil
+        }
</file context>

[cubic-dev-ai]

P3: The final answer wait happens after the last row capture, so late chat answers are omitted from CHAT_ROWS and can falsely fail the seeded benchmark. Capture the palette again after this wait and update the final key's count.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At scripts/cmux-next/palette-open-stages.py, line 194:

<comment>The final answer wait happens after the last row capture, so late chat answers are omitted from `CHAT_ROWS` and can falsely fail the seeded benchmark. Capture the palette again after this wait and update the final key's count.</comment>

<file context>
@@ -152,6 +176,175 @@ def one_open(params):
+        # The chat rows on screen for this key (Search's Agent Chats section; at the base, ranked chat rows).
+        shown = (rpc("debug.palette.capture", {"path": os.path.join(SCRATCH, "key.png")}) or {}).get("rows") or []
+        CHAT_ROWS.append(sum(1 for row in shown if str(row).startswith("chat:")))
+    time.sleep(0.4)  # test harness: the last key's answer lands
+    hangs = rpc("debug.hangs") or {}
+    closed = rpc("debug.key", {"key": "escape", "target": "palette"})
</file context>

Suggested change

	time.sleep(0.4) # test harness: the last key's answer lands
	time.sleep(0.4) # test harness: the last key's answer lands
	if keys:
	shown = (rpc("debug.palette.capture", {"path": os.path.join(SCRATCH, "key.png")}) or {}).get("rows") or []
	CHAT_ROWS[-1] = sum(1 for row in shown if str(row).startswith("chat:"))

[cubic-dev-ai]

P3: A missing chat-index precondition does not stop the benchmark: this branch records a failure and then search_report still measures. Raise or return after the failed check so invalid runs cannot produce timing samples.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At scripts/cmux-next/palette-open-stages.py, line 470:

<comment>A missing chat-index precondition does not stop the benchmark: this branch records a failure and then `search_report` still measures. Raise or return after the failed check so invalid runs cannot produce timing samples.</comment>

<file context>
@@ -224,6 +457,23 @@ def main():
+            print("STRESS-SESSION", json.dumps(summary)[:600], flush=True)
+        if opts.seed_chats:
+            index = wait_for_index(opts.search_keys.split()[0])
+            if not ((index.get("window_total") or index.get("window_rows") or 0) > 0) and not str(index.get("error") or "").startswith("no acpmux"):
+                row("acpmux index", f"rows for {opts.search_keys!r} before typing", json.dumps(index)[:300], False)
+        report = {"tag": TAG, "stress": opts.stress, "seed_chats": opts.seed_chats, "search_keys": search_report(opts.search_keys)}
</file context>

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[lawrencecchen]

Owner of the pushes to this PR is now the perf lead's agent (lead, 13:33Z); the fix agent and the conflict resolver no longer push here.

Review 6 F1 (a no-change redelivery still ran on an empty answer) and a gap found while fixing it:

• 6745efb097c: explicit closure types in AgentChatsPaletteAnswerTests (the Swift 6.3.3 type-checker crash, signal 6, ConstraintSystem.cpp:4138). Same assertions. Compile job 2b11967769747c73a2331d26 passed.
• ad00bfa2bf2 (red): anAnswerWithTheSameRowsRetitledIsDelivered. The skip compared only row ids, so a chat retitled under the same id was dropped.
• c568b6322aa (fix, built on the fix agent's 7e82205): one shared isHeld rule, which joined() also uses. The fingerprint holds the held state, not the raw awaited set, and holds each answer row as it shows (id, title, subtitle, accessory, enabled).

Fleet:

• Red at ad00bfa2bf2 (--red), step b0b7d697dc3299c810d4a150 (aws-m4pro-1): anEmptyAnswerDeliversNothing (resultsVersion 5 vs 4) and anAnswerWithTheSameRowsRetitledIsDelivered (title stayed "Quokka plan") fail on their assertions. The other 12 pass. No crash.
• Green at c568b6322aa, step 1c84581e934bdc795f9eef47 (aws-m4pro-4): 9/9 suites pass (ContributedAnswers, AgentChatsPaletteAnswer, AgentChatsJoinSearch, CmdShiftASearchesEverything, CmdPListsOpenItems, ChatsWindowMainThread, ChatsFeedHoldsNoIndex, AgentChatsMoreChatsPlurals, Signposts).
• Compile-check at c568b6322aa (recipe 2, --app), job 99c38e875759296968a27c5d: CmuxNext, app and cmux-tui pass.
• prepush-gate.py: no new violations.

Per the lead's decision (13:33Z, confirming 11:46Z), this PR lands as a correctness fix with no perf claim. The measured A/B is reported as it is, and no new A/B gates it.

[lawrencecchen]

Review (claude-opus-review-subagent-7): SHIP at c568b63

Scope: the whole PR against merge-base 0e4ed40, and the repair 6745efb..c568b63 (ad00bfa adds only the test, c568b63 changes only PaletteContributedAnswers.swift). I read reviews -6541340463, -6542219906, -6543785296, -6546769110, -6556223157 and -6556602824, the PR body and the fleet comment -6556753577. Read only. I ran no build and no test on this machine. I read the fleet logs.

Lead decision applied: this PR lands as a correctness fix with no perf claim. The A/B in the body is reported as measured. A missing measurement is not a finding.

Review 6 F1: closed

• The fingerprint no longer holds the raw awaited set. It holds held: from isHeld(state.rankedSections ?? [], state:) (PaletteContributedAnswers.swift:165). In Search with a ranked row, held is false before and after an empty answer, so redeliverAnswers returns at :120. A change of held (Search with no ranked row, or the Chats scope's leading answer) still changes the fingerprint, and the stream end always calls scheduleRedelivery after awaitedAnswers.remove (:80-81), so a Return that waits is released.
• isHeld is equal to the old expression in every case. Row counts are never negative, so ranked.reduce(0) { $0 + $1.rows.count } == 0 is true exactly when no section has a row (!ranked.contains { !$0.rows.isEmpty }), also for an empty array. joined (:136) and the fingerprint use the same function. In deliver, rankedSections is set before both calls (PaletteModel+Search.swift:279-284), so both read the same rows.

Fingerprint: no real change is skipped

deliver is the only writer of rankedSections and it records the fingerprint each time (PaletteModel+Search.swift:279-284). Thus the fingerprint only has to cover what changes between two deliveries of the same ranked rows: the answers, the stand-in state, the query and held.

• Stand-ins: current versus stand-in is answerQueries[id] == query (PalettePageState.swift:192-193). Both answerQueries[id] and query: are in the fingerprint, so a stand-in that becomes current (also with identical rows, or a whitespace-only query edit) redelivers.
• More row and its count: Search's count is entries - share + counts.pastPage(query) (withAnswers :182-191, AgentChatsPalettePage.swift:52-54). share depends on the ranked row count (fixed between deliveries) and the leading rows (in the fingerprint). pastPage is total - rows.count, recorded in the same answer (AgentChatsPalettePage.swift:113-117); when it is not 0, the answer has the agentChats.more notice row whose title holds the total, and the title is in the fingerprint. So a new count always changes the fingerprint.
• Section and order: one answer section per contribution id, with the contribution's section and order; the keys are sorted. leading is fixed per page.
• Ranked rows in the same turn: the rank's deliver records the fingerprint with the answer already joined, so the scheduled hop skips a delivery that is already on screen. A rank that lands before the answer records the fingerprint without it, so the answer redelivers.
• New query: the generation guard (:119) holds the answer until the new rank delivers, and query: changes.
• Retitle, a new cwd or a new relative date: title, subtitle and accessory are in the fingerprint. This matters now that the awaited set is gone: a re-ask from followSources that gets the same chats with new titles redelivers.

Red and green evidence (checked in the fleet logs)

• Red step b0b7d697dc3299c810d4a150 at ad00bfa (ContributedAnswersTests, exit 1): anEmptyAnswerDeliversNothing fails at :323 (resultsVersion 5 vs 4) and anAnswerWithTheSameRowsRetitledIsDelivered fails at :343 (title stayed "Quokka plan"). The other 12 pass. No crash. The fix commit changes only the source file, so the red and green run the same tests.
• Green step 1c84581e934bdc795f9eef47 at c568b63: all 9 suites pass (ContributedAnswers 14/14, AgentChatsPaletteAnswer 11/11, AgentChatsJoinSearch, CmdShiftASearchesEverything, CmdPListsOpenItems and the others).
• Compile job 99c38e875759296968a27c5d at c568b63: done.
• Both tests use search.chats, which is Search (Cmd-Shift-A, WindowActionCatalog.swift:207), with the ranked "Quokka notes" row, so they test the non-leading case that review 6 named.

Earlier findings: none came back

• Review 1 F1: Search and the Chats & agents scope ask the real page (PaletteController+SearchPage.swift contributed, askContributions).
• Review 2 F1/F2/F3: rankedGeneration == generation guard (:119); a non-leading answer goes after the best ranked section and scrollRequest keeps the selected row in view (:125-127); a leading answer holds the rows (awaitsLead).
• Review 3 F1/F2, M1-M3 and review 4 F1, notes 2-7: stand-ins only in shown (:142-143); share = max(searchShare, room); no timer; ready:false, refusals and a dropped connection end the query at once; an older generation's refusal is ignored; isAnswered checks failed and awaitingFull.
• Review 5 F2 and review 6 F1: closed above. Review 5 notes 1-4: closed (review 6 confirmed; the code did not change since).

Checked, no defect found

• Return: in Search it runs the best ranked row of the current query; with no ranked row it waits while the answer is awaited. In the Chats scope it waits for the leading answer. Every request ends with rows, with none, or when the query moves on.
• Stand-ins are never selectable and never final: the reducer gets navRows(joined.selectable) and held keeps them provisional.
• No main-thread wait on acpmux and no data race: all reads are AsyncStreams; the history is encoded on a detached task from a value copy; the fingerprint is pure main-actor work over state the page owns.
• Lifetimes: leave cancels the answer tasks, drops the source tokens and closes palette.chats; a chosen chat closes the window; the redelivery hop holds the state weakly.
• Mirror: git grep finds no reader of AcpmuxChatsStore, chatsFeed?.chats or the mirror's newest( in Packages (the newest( hits are DaemonClosedHistory and the computer-use ring).
• Bench: no file under .github/ or scripts/ci/ names palette-open-stages.py or palette-open.sh, and the diff touches neither directory. No CI step, gate or budget.
• The branch merges into origin/feat-cmux-next with no conflict (git merge-tree). Label risk:normal is present.

Notes (do not block)

1. The fingerprint has the fields the chats rows can change, but not every field a delivery reads: symbol, brand, enters, drills and the secondary actions (which navRows reads) are not in it. For the chats page these are fixed per chat id, so nothing is skipped today. If another queryResults page changes one of them under the same id, add it.
2. anEmptyAnswerDeliversNothing proves the absence with 50 Task.yield() calls (ContributedAnswersTests.swift:322). It failed at the red, so it reaches the code, but a later change that moves the redelivery further out could make it pass with no check (REVIEW.md 6). A counter of skipped redeliveries would be a direct signal.
3. The PR body's Testing list still does not name the review 6 and review 7 tests (anEmptyAnswerDeliversNothing, anAnswerWithTheSameRowsRetitledIsDelivered) or their step ids; they are only in the comment.
4. Review 6 notes 1 and 2 stay open: the bench writes a PNG per key inside the stall window, and a stand-in's more row reads the new query's count until the new answer lands.
5. The follow-ups of the first receipts stay open: the relative-date search, ranking under the index lock, and the New Tab substring filter.