[teamleaderleo]

Debug Settings loses two switches that have been on by default and never needed turning off: Side sessions (/btw) (agentPane.debug.sideSessions) and Send again a prompt a dropped connection lost (agentPane.debug.lostPromptReplay). Nothing changes for anyone on the defaults: /btw, /side and the palette's Ask a Side Question… are always offered in an agent chat (the Quick Composer still has no /btw, as before), and a prompt acpmux never took because its connection dropped always goes again on the next connection.

Leo, 2026-11-05: "i meant can you do all of htem" (the ranked list whose move 10 is "Flip or delete Debug/Labs flags after 7 days (flips need Leo's OK)").

Leo, 2026-11-05 08:34Z: "rulebook cut and any flag flip only merge after you OK them. i ok them i know most are super stale/superseded/obsolete/can be condensed and consolidated"

What's removed

Side sessions:

• The Tunable and its descriptor entry; AgentPaneHeaderState.sideSessions and the sideSessions field it sent the page.
• ActionContext.sideSessions (bit 23, the highest bit, so no other bit moves), its keyNames and RegistryControlBridge.contextNames entries, and ActionRegistry.publishSideSessions. agentPane.sideQuestion now requires only .agentPaneFocused.
• Page side: aside/sideSessions.ts and the header state's sideSessions. The composer's opensSideSessions is now just !quick, so the Quick Composer's "Side questions are disabled" refusal stays.
• Tests that only covered the off path: header-state-side-sessions.test.ts, the three "Side sessions off" browser tests in agent-pane-btw-side-session.test.ts (and the helpers only they used), and AgentPaneSideSessionsHeaderTests (replaced by one test that a focused chat offers Ask a Side Question…).

Lost-prompt replay:

• The Tunable and its descriptor entry. With it on, the transport always called ended(byDaemon: false), so the byDaemon parameter and the journal branch that dropped the page's prompts on a daemon close (reached only with the switch off) are gone. AgentPanePromptJournal.connectionEnded(owner:) now just releases the connection's holds, as it did by default.
• The off case of aPromptTheDaemonDroppedWithItsConnectionGoesAgainOnTheNextOne.

schemas/defaults/cmux-next.json drops the four lines for these two keys. plans/cmux-next/swift-logic-classes.tsv drops the deleted file's row.

Takes back #25441: on purpose. This deletes the Side sessions (/btw) gate #25441 wired in (the ActionContext.sideSessions bit and its publishing). Ask a Side Question… stays in the palette, now gated only by agent-pane focus, since side sessions are on by default and the gate goes with Leo's OK above.
Takes back #27091: on purpose. It deletes only the /btw browser tests that covered the gate's off state, which can no longer happen.

Changelog

Removed: the Debug Settings toggles "Side sessions (/btw)" and "Send again a prompt a dropped connection lost"; both behaviours stay on.

Observed / Not run

Observed:

• python3 scripts/cmux-next/prepush-gate.py: no new violations.
• webviews: bun run check passes; scripts/web-lint.sh passes.
• bun test test/cmux-command-dispatch.test.ts test/composer-return-sends.test.tsx src/agent-session/acpmux/cmuxCommands.test.ts: 34 pass.
• Compile check of CmuxNext at c1be714: passed (job a31d26dfea8489695540339e).
• CMUX_BROWSER_TESTS=1 bun test test/agent-pane-btw-side-session.test.ts test/cmux-command-dispatch.test.ts at c1be714 on CI (run 41999232584): 15 pass, including the ten real-Chromium /btw tests.

Not run:

• The CmuxNextAgentPane Swift suites touched here (AgentPaneUnsentPromptTests, AgentPaneSendPickedFolderPromptTests, AgentPaneSideQuestionAvailabilityTests, AgentPageCommandTests) were not run; the compile check covers only the sources.
• python3 scripts/ci/defaults_guard.py check-fresh still reports base drift from cmux NEXT: Live Web Reload on by default in every build, and live in Chromium too #36173 (webDev.override), which this PR leaves alone.

Agent session: agent session

🤖 Generated with Claude Code

[github-actions]

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

Review 5c5b8c7: 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=pr36333 -f ref=lane/nx-flag-rot-side-sessions -f platform=macos -f backend_mode=local

Gallery before/after for 5c5b8c7: 16 states rendered, 0 images differ, 3747 more touched states not rendered. Images are in the run's artifact, not on this public PR; the independent review of this head reads them on its own, so the PR needs no hand-made screenshots of these states.

gh run download 42048773737 -R manaflow-ai/cmux -n gallery-advisory-36333-5c5b8c729e94748135f210aefe58858350f52967 (then read gallery-review.json)

States

State	Theme	Status	Diff	Picked by
agent-pane.chat-width/standard	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.chat-width/standard	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.chat-width/wide	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.chat-width/wide	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.chat-width/wide-blocks	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.chat-width/wide-blocks	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-edge/short-edge	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-edge/short-edge	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-edge/wide-edge	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-edge/wide-edge	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-edge/no-edge	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-edge/no-edge	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-floats/scrolled-to-end	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-floats/scrolled-to-end	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-floats/composer-grown	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-floats/composer-grown	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-40	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-40	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-56	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-56	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-72	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-72	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/shipped	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/shipped	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/two-thirds	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/two-thirds	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/half-tucked	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/half-tucked	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/before	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/before	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.copy-controls/output	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.copy-controls/output	Apple System Colors	unchanged	0%	own App.tsx

_{Pick other states with a Gallery: entry.id, entry.id/variant line in the PR body.}

Default changes

This pull request changes 4 defaults at 5c5b8c729e94 (what everyone gets without configuring anything):

• tunable-source.CmuxNextAgentPane/AgentPaneTunables.swift:lostPromptReplay: "2c31be0b94d7b46601841d2c4a2c2003756e25be45010520737622cca68c9e74" -> (none)
• tunable-source.CmuxNextAgentPane/AgentPaneTunables.swift:sideSessions: "8c0422ae2a0f7308ab48c20b3f71adbe1bbb64db6def7ede0aa7638286980155" -> (none)
• tunable.agentPane.debug.lostPromptReplay: true -> (none)
• tunable.agentPane.debug.sideSessions: true -> (none)

Signed off on this commit by review (codex, router-review).

Merge receipt: merged as d32c886dd9e6 with these defaults changed, signed off by review (codex, router-review).

Regenerate the snapshot with python3 scripts/ci/defaults_guard.py snapshot.

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4210546330101 (bcf992a1a9)

[teamleaderleo]

Review (codex, router-review): SHIP at c1be714

Reviewer: codex gpt-6.1-sol xhigh, fast tier.

Follow-ups: 1. They land as checklist items in this PR's one follow-up tracking issue in this repo (Follow-ups: #N ..., label follow-up; add to an open one before filing, never one issue per finding), linking this receipt; the lane that opened the PR fixes them forward.

SHIP at c1be714

Visual verdict: no images; Leo tries the build

• [P2] [follow-up] [category:ux] [finding:F1] [outcome:pending] No after screenshot is available for the changed side-question UI around webviews/src/agent-session/acpmux/App.tsx:9902; provide one for visual verification.

Follow-ups:

• F1: Provide an after screenshot for visual verification.

[cmux-bot]

cmux-bot approves c1be714: an independent review passed this exact head (router-review receipt by teamleaderleo). A push needs a new review; a later BLOCK at this head dismisses this approval.

A newer verdict blocks c257119 (no independent SHIP at the head).

[teamleaderleo]

Review (codex, router-review): SHIP at af7f3dc

Reviewer: codex gpt-6-astra high, fast tier.

Follow-ups: 1. They land as checklist items in this PR's one follow-up tracking issue in this repo (Follow-ups: #N ..., label follow-up; add to an open one before filing, never one issue per finding), linking this receipt; the lane that opened the PR fixes them forward.

SHIP at af7f3dc
Visual verdict: no images; Leo tries the build

• [P2] [follow-up] [category:ux] [finding:F1] [outcome:pending] No after screenshots are available (README.txt); provide them when the gallery lane is available for visual verification.

Follow-ups:

• F1: provide after screenshots for the changed agent-pane UI.

[cmux-bot]

cmux-bot approves af7f3dc: an independent review passed this exact head (router-review receipt by teamleaderleo). A push needs a new review; a later BLOCK at this head dismisses this approval.

[cursor]

Bugbot needs on-demand usage enabled

Bugbot uses usage-based billing for this team and requires on-demand usage to be enabled.

A team admin can enable on-demand usage in the Cursor dashboard.

[teamleaderleo]

Review (codex, router-review): SHIP at 5c5b8c7

Reviewer: codex gpt-6.1-sol xhigh, fast tier.

Follow-ups: 2. They land as checklist items in this PR's one follow-up tracking issue in this repo (Follow-ups: #N ..., label follow-up; add to an open one before filing, never one issue per finding), linking this receipt; the lane that opened the PR fixes them forward.

SHIP at 5c5b8c7

Visual verdict: no images; Leo tries the build

• [P2] [follow-up] [category:docs] [finding:F1] [outcome:pending] Comments still describe daemon-closed prompts as dropped and /btw as having a kill switch (AgentPanePromptJournal.swift:17, App.tsx:9727); update them to reflect the new always-replay behavior.

• [P2] [follow-up] [category:ux] [finding:F2] [outcome:pending] No after screenshots or gallery artifact were supplied for this UI-gating change; add visual evidence when available.

Follow-ups:

• F1: update stale replay and kill-switch comments.
• F2: provide UI capture when available.

[cmux-bot]

cmux-bot approves 5c5b8c7: an independent review passed this exact head (router-review receipt by teamleaderleo). A push needs a new review; a later BLOCK at this head dismisses this approval.