[teamleaderleo]

Problem

acpmux #28182 answers _acpmux/sessions and _acpmux/watch with no limit in byte-bounded pages when the whole list is over its largest message (~14 MiB): the first page carries a nextCursor, and the rest is read with _acpmux/sessions {cursor, ...same params}. One daemon's list was 17 MB with tools and was refused as message.too_large. The Chief's Rust client reads only the first reply, so against a paging daemon it would come up on part of the list and miss sessions on later pages (its own leftover turn and compactor sessions, a peer's session find/session fall back to the list for).

What changed

• optchat-chief/src/acpmux.rs: one helper, whole_list, reads every page (the reference is acpmux's Client::whole_list in acpmux: a session list too large for one message goes in pages #28182): with no limit it follows nextCursor by _acpmux/sessions with the same params less the watch's enabled, and joins sessions. A cursor that comes again is refused with an error, so a bad daemon never loops it. With a limit, one plain request. A list that fits is one reply with no cursor, so older daemons work unchanged.
• Every _acpmux/sessions / _acpmux/watch call in optchat-chief without a limit goes through it: the link's watch, sessions() (the list fallback for session/find and agents), and agents.rs's bounded sessions_bounded (each page keeps its 1 s bound).
• Tests: tests/acpmux_session_info.rs adds a fake daemon that answers in two pages (the_link_comes_up_on_every_page_of_the_watch_list, a_session_on_a_later_page_of_the_list_is_found, a_cursor_that_comes_again_is_refused); src/acpmux.rs adds a unit test that a list with a limit is one request.

The test commit comes first; the fix follows.

Red / green

Linux fast checks (cargo test --no-fail-fast of the whole optchat-chief crate):

• Red, at the test commit 93fbd17 (base plus the new tests only): https://github.com/manaflow-ai/cmux/actions/runs/41047905428. The three new tests fail as expected: the_link_comes_up_on_every_page_of_the_watch_list (left: ["s-1"], the link came up on page one only), a_session_on_a_later_page_of_the_list_is_found (listed on page two: not found), a_cursor_that_comes_again_is_refused (unwrap_err() on Ok(None)). One more fails: harness::the_chiefs_turn_and_compactor_sessions_carry_cmux_chief_and_children_do_not (harness.rs:445, left: 5).
• Green, at the head 952bc60: https://github.com/manaflow-ai/cmux/actions/runs/41049652619. 114 test binaries pass, 690 tests passed. All three new tests pass, and so does the whole_list_tests unit test. One binary fails, --test harness, on the same test.

Failing tests at the head, compared by name with the base:

Test	Head	Base (the merge-base 4a0b8f0 itself)	Verdict
harness::the_chiefs_turn_and_compactor_sessions_carry_cmux_chief_and_children_do_not	fails, harness.rs:445:9, left: 5 right: 4	fails, harness.rs:445:9, left: 5 right: 4 (run 41050748089, tested tree 943c5e5b = the merge-base's tree; the only failure of 28 in --test harness)	base red: same assertion on base, not a crash. The turn session's tags gained cmux.chief.participant in #27935 and the test still counts 4; this PR touches neither

No crash, signal or cut-short run in either run.

No capture: no UI change.

Observed / Not run

Observed: the red and green Linux runs above, and the base run of the harness test. Fresh-home launch at the head 952bc60 on a fleet Mac (build b0d14eaaee6d99eb3f453260): PASSED. Home in 6.4 s, up 30 s, no crash; the Chief thread "Chief - Main - This Mac" is listed and its intro rendered, with no error banner (run with --no-status, so no commit status was posted). An independent Codex (gpt-6-astra, high) review of 4a0b8f0..952bc60 gave VERDICT: SHIP, with no findings.

Not run: a run against a real daemon that pages (#28182 landed after these tests ran).

Changelog

• Chief reads a paged acpmux session list whole, so it sees every session on a daemon whose list is too large for one message.

Agent session: agent session

🤖 Generated with Claude Code

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[blacksmith-sh]

Found 2 test failures on Blacksmith runners:

Failures

Test	View Logs
test_every_listed_hook_is_one_glaeda_released_with_the_check (main.SigningHooksInSt epWithGlaedaTests.test_every_listed_hook_is_one_glaeda_released_with_the_check)/ test_every_listed_hook_is_one_glaeda_released_with_the_check (main.SigningHooksInSt epWithGlaedaTests.test_every_listed_hook_is_one_glaeda_released_with_the_check)	View Logs
test_the_repository_highlights_validate (main.DigestTests.test_the_repository_highl ights_validate)/ test_the_repository_highlights_validate (main.DigestTests.test_the_repository_highl ights_validate)	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review 952bc60: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr28297 -f ref=lane/acpmux-chief-clients-pages -f platform=macos -f backend_mode=local

web and size checks: green

[teamleaderleo]

@lawrencecchen for awareness, since you have the most recent commits on these Chief paths (optchat-chief/src/acpmux.rs, src/agents.rs, tests/acpmux_session_info.rs): this PR makes the Chief's acpmux client read a session list that acpmux #28182 sends in pages (nextCursor). The change is one helper, whole_list. The link's watch, sessions() and the bounded list in agents.rs go through it. A list that fits is still one request, so older daemons behave as before. A review is welcome but not required. It is held until #28182 lands and a fresh-home launch on a fleet Mac passes.

Separately, harness::the_chiefs_turn_and_compactor_sessions_carry_cmux_chief_and_children_do_not fails on the base as well (harness.rs:445, left: 5 right: 4). It is not caused by this PR.

[teamleaderleo]

Review (Codex gpt-6-astra, high, independent): SHIP at 952bc60. It found nothing to fix: every _acpmux/sessions / _acpmux/watch call with no limit goes through whole_list, a repeated cursor is refused, and the tests are red at the base and green with the fix.

[teamleaderleo]

Chief rule 2, the failing test by name on base itself: harness::the_chiefs_turn_and_compactor_sessions_carry_cmux_chief_and_children_do_not fails on the merge-base 4a0b8f0 exactly as at this PR's head: tests/harness.rs:445:9, assert_eq!(tags.len(), 4), left: 5 right: 4. Run: https://github.com/manaflow-ai/cmux/actions/runs/41050748089 (tested tree 943c5e5b, the merge-base's tree). It is the only failure in --test harness there (27 passed), an assertion, not a crash. So it is a base red, not this PR's.

Cause: turn_tags in optchat-chief/src/acpmux.rs adds cmux.chief.participant since #27935, so a turn session has 5 tags; the test still counts 4. This PR changes neither file.

[teamleaderleo]

Chief rule 2 at 952bc60: every failing check, compared by test name against base. This PR changes only Native/OptChat/optchat-chief/{src/acpmux.rs, src/agents.rs, tests/acpmux_session_info.rs}. None of these reds is a crash (no signal, abort or dead runner), and every one fails the same way on base.

Check	Failing step / test at this head	Base	Verdict
rust workspaces / Native/OptChat/optchat-chief (job)	harness::the_chiefs_turn_and_compactor_sessions_carry_cmux_chief_and_children_do_not, tests/harness.rs:445 (tags left 5, right 4)	fails the same way on the merge-base itself (comment); the base fix #28316 has since landed	base red
rust workspaces / rust workspaces	"Every planned workspace passed"	wrapper of the row above	base red
cmux-next checks (job)	check-state-roots: cmux-tui/crates/acpmux/src/cli/help_examples/session.rs:179 (a literal ~/.acpmux root), so "red check: No literal state roots"	the same file, line and red check on base cc40c49 (job)	base red
same job	"3 commit(s) change the sidebar's drawing code without a Sidebar-Look: trailer": 4367c16, 6c1a5ab, eb8105b	all three are feat-cmux-next commits before this PR's merge-base, not this PR's (its commits are 93fbd17 and 952bc60, Chief only)	not this PR's
release-notary (job)	test_the_repository_highlights_validate (chief-name-in-agent-chats.md), test_every_listed_hook_is_one_glaeda_released_with_the_check (hash 0de22d74… not found)	the same two tests with the same assertions on base 8f5dfe0 (job)	base red
Guard status	"Check routed guard jobs"	wrapper of release-notary	base red

The other Chief rules at this head:

• (1) Codex gpt-6-astra SHIP at 952bc60 (comment). The head is unchanged, and it merges cleanly with the current base 49c648c, which has acpmux: ACP session/list goes in pages when the whole list is too large to send #28161 and acpmux: a session list too large for one message goes in pages #28182.
• (3) cmux-ci/fresh-home success at 952bc60.
• (4) lawrencecchen is requested as reviewer, with an awareness comment (comment).

[teamleaderleo]

Chief rule 2 at the new head c97a42e (base 49cba34 merged in; the PR's own diff is unchanged, patch-id 203ff031): every failing check, compared by test name against base. The earlier classification at 952bc60 doesn't hold: that run's optchat-chief job stopped at its first failing binary, so it was cut short.

• rust workspaces / Native/OptChat/optchat-chief passed this time and ran the whole workspace (job): 115 test binaries ok, 0 failed. That includes acpmux_session_info, harness, shared_acpmux, sub_watch and every subagent_* test. rust workspaces passed too (job).
• Of 95 checks, only two failed. Both fail the same way on base 49cba34 itself, the base this head merged, and neither is a crash:

Check	Failing tests at this head	Base 49cba34 (job)	Verdict
release-notary (job)	test_the_repository_highlights_validate (chief-name-in-agent-chats.md); test_every_listed_hook_is_one_glaeda_released_with_the_check (hash e94edf9c… not found)	the same two tests, the same assertions and the same hash	base red
Guard status	"Check routed guard jobs"	wraps release-notary	base red

The Astra SHIP at 952bc60 carries over by patch-id: the PR's own change is the same three optchat-chief files, byte for byte. The acpmux panic ratchet covers only cmux-tui crates, which this PR doesn't touch.

[teamleaderleo]

Fresh-home launch of c97a42e4074e on a fleet capture Mac (empty HOME, CFFIXED_USER_HOME, TMPDIR and defaults): PASS

Verdict	PASS
Build	fleet job 67ff54d67772fcc467897936 of c97a42e4074e
Validator	scripts/ci/fresh_home_launch_smoke.py from feat-cmux-next at 45d6f7093d11
Home rendered	9.0s after launch
Up	30s
first_window_frame_committed	5221 ms
Crash reports / uncaught exceptions	0 / 0

Screenshot withheld: the pr-media privacy check or upload refused it.

cmux-ci fresh-home --job 67ff54d67772fcc467897936 --pr N (commit status cmux-ci/fresh-home on c97a42e4074e)

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4110084161401 (92b6fe2118)
• cmux NEXT nightly 1.0.0-nightly.4110335000301 (abe139dc5a)
• cmux NEXT nightly 1.0.0-nightly.4110516029701 (b7196082e9)
• cmux NEXT nightly 1.0.0-nightly.4110699040101 (723153fb7a)