cmux NEXT: delete the side sessions and lost prompt replay debug switches

Packages/macOS/CmuxNext/Sources/CmuxNextActions/ActionContext.swift

@@ -59,8 +59,6 @@ public nonisolated struct ActionContext: OptionSet, Sendable, Hashable {
     /// A markdown page (with ``markdownFocused``) edits its file: bare keys
     /// are typing there.
     public static let markdownEditorFocused = ActionContext(rawValue: 1 << 22)
-    /// Debug Settings' Side sessions (/btw) is on; Ask a Side Question… is offered only then.
-    public static let sideSessions = ActionContext(rawValue: 1 << 23)
 
     /// Contexts whose page owns bare keys (no Command, Control or Option):
     /// only while one holds, and no text field has the keyboard, may a

Packages/macOS/CmuxNext/Sources/CmuxNextActions/Catalog/AgentSideQuestionActionCatalog.swift

@@ -1,6 +1,5 @@
 /// Ask a Side Question… (`/btw`): the focused chat's composer starts a side question, which opens
 /// as a side session in the chat's one side pane. No default key (default hotkeys need a call).
-/// Offered only while Debug Settings' Side sessions (/btw) is on (``ActionContext/sideSessions``).
 nonisolated enum AgentSideQuestionActionCatalog: ActionCatalogGroup {
     static func descriptors() -> [ActionDescriptor] {
         [
@@ -9,7 +8,7 @@ nonisolated enum AgentSideQuestionActionCatalog: ActionCatalogGroup {
                 title: String(localized: "action.agentPane.sideQuestion", defaultValue: "Ask a Side Question…", bundle: .module),
                 keywords: ["agent", "chat", "btw", "side", "question", "aside", "ask", "session"],
                 category: .agents, symbol: "questionmark.bubble", surfaces: [.palette],
-                requires: [.agentPaneFocused, .sideSessions], targets: [.pane],
+                requires: [.agentPaneFocused], targets: [.pane],
                 surfacePlan: ActionSurfacePlan(cli: .exempt(.guiOnly), contextMenuExemption: .guiOnly)
             ),
         ]

Packages/macOS/CmuxNext/Sources/CmuxNextActions/KeyContext.swift

@@ -126,7 +126,6 @@ extension ActionContext {
         (.omnibarFocused, "omnibarFocused"), (.codeEditorFocused, "codeEditorFocused"),
         (.homeChannelsEnabled, "homeChannelsEnabled"), (.webViewFocused, "webViewFocused"),
         (.markdownReadOnlyFocused, "markdownReadOnlyFocused"), (.markdownEditorFocused, "markdownEditorFocused"),
-        (.sideSessions, "sideSessions"),
     ]
 
     /// The bits a window's focus decides; the rest are app-wide facts.

Packages/macOS/CmuxNext/Sources/CmuxNextAgentPane/AgentPaneActions.swift

@@ -90,7 +90,7 @@ extension ActionRegistry {
 
     /// A header state with every value given (no Debug Settings read), only to ask which commands
     /// are toggles the App can read (``AgentPageCommand/isOn(in:)`` not nil).
-    private static let blankHeaderState = AgentPaneHeaderState(sideSessions: false, sessionInfo: false, browserOpensPreview: false)
+    private static let blankHeaderState = AgentPaneHeaderState(sessionInfo: false, browserOpensPreview: false)
 
     /// Binds Session Info for the invocation's pane, focused when there is no target. With
     /// `agent.sessionInfo` off the page has no Session Info, so the action refuses instead of

Packages/macOS/CmuxNext/Sources/CmuxNextAgentPane/AgentPaneHeaderState.swift

@@ -13,35 +13,31 @@ public struct AgentPaneHeaderState: Equatable, Sendable {
     public var pullRequest: AgentPanePullRequest?
     /// The "..." menu offers Move to Floating Chat (Start Agent's floating chat is on, cx-b9qi).
     public var floatingChat: Bool
-    /// Debug Settings' Side sessions (/btw) is on (``AgentPaneTunables/sideSessions``): the composer
-    /// offers `/btw`. The init reads the toggle unless given, so a watch that builds the state observes it.
-    public var sideSessions: Bool
-    /// The header offers Session Info (Debug Settings `agent.sessionInfo`, cx-ncc.101), read like
-    /// `sideSessions`. The page reads it as `inspector` (``json``), a wire name kept so a page and an
+    /// The header offers Session Info (Debug Settings `agent.sessionInfo`, cx-ncc.101). The init
+    /// reads the toggle unless given, so a watch that builds the state observes it. The page reads it as `inspector` (``json``), a wire name kept so a page and an
     /// app from either side of the rename still agree.
     public var sessionInfo: Bool
     /// The header's Browser opens the chat's page and Preview is no button of its own (Debug Settings
-    /// `agentChat.browserOpensPreview`, on by default), read like `sideSessions`.
+    /// `agentChat.browserOpensPreview`, on by default), read like `sessionInfo`.
     public var browserOpensPreview: Bool
     /// Rises with every change the App sees: a `pane.tabState` reply that reaches the page after a
     /// newer push (two channels) is older, and the page keeps the newer state.
     public var version = 0
 
     public init(pinned: Bool = false, sideTabs: Bool = false, lit: [String] = [], floatingChat: Bool = false,
-                sideSessions: Bool? = nil, sessionInfo: Bool? = nil, browserOpensPreview: Bool? = nil) {
+                sessionInfo: Bool? = nil, browserOpensPreview: Bool? = nil) {
         self.pinned = pinned
         self.sideTabs = sideTabs
         self.lit = lit
         self.floatingChat = floatingChat
-        self.sideSessions = sideSessions ?? AgentPaneTunables.sideSessions.value
         self.sessionInfo = sessionInfo ?? AgentPaneTunables.sessionInfo.value
         self.browserOpensPreview = browserOpensPreview ?? AgentPaneTunables.browserOpensPreview.value
     }
 
     /// Whether the header shows the same thing, whatever the versions.
     public func shows(_ other: AgentPaneHeaderState) -> Bool {
         pinned == other.pinned && sideTabs == other.sideTabs && lit == other.lit && floatingChat == other.floatingChat
-            && pullRequest == other.pullRequest && sideSessions == other.sideSessions && sessionInfo == other.sessionInfo
+            && pullRequest == other.pullRequest && sessionInfo == other.sessionInfo
             && browserOpensPreview == other.browserOpensPreview
     }
 
@@ -50,7 +46,7 @@ public struct AgentPaneHeaderState: Equatable, Sendable {
     /// `pullRequest` is always there, `null` when there is none, so the page drops a chip it kept.
     var json: JSONValue {
         ["pinned": .bool(pinned), "sideTabs": .bool(sideTabs), "lit": .array(lit.map(JSONValue.string)), "floatingChat": .bool(floatingChat),
-         "sideSessions": .bool(sideSessions), "inspector": .bool(sessionInfo), "browserOpensPreview": .bool(browserOpensPreview), "version": JSONValue(version),
+         "inspector": .bool(sessionInfo), "browserOpensPreview": .bool(browserOpensPreview), "version": JSONValue(version),
          "pullRequest": pullRequest?.json ?? .null]
     }
 }

Packages/macOS/CmuxNext/Sources/CmuxNextAgentPane/AgentPanePromptJournal.swift

@@ -228,27 +228,16 @@ public nonisolated final class AgentPanePromptJournal: Sendable {
         }
     }
 
-    /// Connection `owner` ended. `byDaemon`: the daemon's side closed it, and its page was told,
-    /// so the prompts that page sent are the page's again (Retry); the rest are left over. The
-    /// change is made at once (no file read on the caller's thread) and written off it.
-    func connectionEnded(owner: UUID, byDaemon: Bool) {
-        let snapshot = state.withLock { state -> (Int, [Entry], [PendingTrust])? in
+    /// Connection `owner` ended: the prompts it held are left over, for the next connection to
+    /// send again. Nothing on disk changes.
+    func connectionEnded(owner: UUID) {
+        state.withLock { state in
             state.ended.insert(owner)
-            guard state.loaded else { return nil }
-            var changed = false
+            guard state.loaded else { return }
             for (key, holder) in state.holders where holder.owner == owner {
                 state.holders[key] = nil
-                if byDaemon, case .page = holder {
-                    state.entries.removeAll { Self.key($0.daemon, $0.promptId) == key }
-                    changed = true
-                }
             }
-            guard changed else { return nil }
-            state.generation += 1
-            return (state.generation, state.entries, state.pendingTrust)
         }
-        guard let (generation, entries, pendingTrust) = snapshot else { return }
-        queue.async { [self] in write(entries, pendingTrust: pendingTrust, generation: generation) }
     }
 
     /// The prompts kept now (tests).

Packages/macOS/CmuxNext/Sources/CmuxNextAgentPane/AgentPanePromptRelay.swift

@@ -24,11 +24,9 @@ nonisolated struct AgentPanePromptRelay: Sendable {
         { [journal, daemon] promptId in journal.forget(daemon: daemon, promptId: promptId) }
     }
 
-    /// The connection ended: `byDaemon` when the daemon's side closed it and the page was told
-    /// (its prompts are the page's again, with Retry); otherwise its prompts are left over for the
-    /// next connection.
-    func ended(byDaemon: Bool) {
-        journal.connectionEnded(owner: owner, byDaemon: byDaemon)
+    /// The connection ended: its prompts are left over for the next connection.
+    func ended() {
+        journal.connectionEnded(owner: owner)
     }
 
     /// Records the decided prompt in `box` on disk before it goes (a prompt with no promptId gets

Packages/macOS/CmuxNext/Sources/CmuxNextAgentPane/AgentPaneTransport.swift

@@ -418,7 +418,7 @@ import CmuxNextCompat
         decisions.reset()
         onQuestionStateChanged?()
         localAppToken = nil
-        promptRelay?.ended(byDaemon: false)
+        promptRelay?.ended()
     }
 
     func offerQuestionKeyCredit(target: PageQuestionKeyTarget, intent: AgentPaneGestureIntent,
@@ -484,9 +484,8 @@ import CmuxNextCompat
             gestures.clearTickets(connection: current)
             localAppToken = nil
             // A connection the daemon closed: its prompts go again on the next connection, where the
-            // page waits for them, unless Debug Settings agentPane.debug.lostPromptReplay is off (then
-            // they are the page's again).
-            promptRelay?.ended(byDaemon: deliver != nil && !AgentPaneTunables.lostPromptReplay.value)
+            // page waits for them.
+            promptRelay?.ended()
             // Kept in the log (notice, not info): the page's "connection interrupted" needs its reason.
             Self.logger.notice("agent pane transport closed connection=\(self.current, privacy: .public) code=\(batch.closed?.code ?? 0, privacy: .public) error=\(batch.closed?.error?.rawValue ?? "-", privacy: .public)")
         }

Packages/macOS/CmuxNext/Sources/CmuxNextAgentPane/AgentPaneTunables.swift

@@ -236,14 +236,6 @@ public nonisolated struct AgentPaneTunables {
         help: "Agent chats show the live plan card and the recap card.",
         default: false, code: "AgentPaneTunables.sessionStatus")
 
-    /// Side sessions: the composer's `/btw <question>` opens a read-only side session about the chat
-    /// beside it, and the palette offers Ask a Side Question… when the gate is on.
-    /// On by default; the page reads it from the header state (``AgentPaneHeaderState/sideSessions``).
-    public static let sideSessions = Tunable<Bool>.toggle(
-        "agentPane.debug.sideSessions", PageTunables.section, "Side sessions (/btw)",
-        help: "The composer's /btw opens a read-only side session beside the chat, and the palette offers Ask a Side Question….",
-        default: true, code: "AgentPaneTunables.sideSessions")
-
     /// Which done thoughts fold to one line that opens to their text (webviews
     /// conversation/ThoughtRow.tsx): every one by default (Leo 2026-10-20), or, as before, only a
     /// tall one. A long thought streams in a fixed seven-line viewport with its newest line in view,
@@ -417,17 +409,6 @@ public nonisolated struct AgentPaneTunables {
         help: "Visual treatment for the session sidebar's latest-reply hover preview: card, quiet, or outline.",
         default: .card, code: "AgentPaneTunables.sidebarPreviewVariant")
 
-    /// Whether a prompt the daemon dropped with its connection before acpmux took it (an acpmux
-    /// restart, a reset socket) goes again on the pane's next connection, under its promptId, so
-    /// acpmux runs it at most once (``AgentPanePromptJournal``). On by default: the page waits for
-    /// the prompt to show on that connection instead of saying "Not sent" (webviews lostPrompt.ts;
-    /// Leo, 2026-10-21: "why does it say it's not responding?"). Off, the page says "Not sent" once
-    /// its wait for the prompt runs out, and gives it back.
-    public static let lostPromptReplay = Tunable<Bool>.toggle(
-        "agentPane.debug.lostPromptReplay", PageTunables.section, "Send again a prompt a dropped connection lost",
-        help: "A prompt acpmux never took because its connection dropped goes again on the next connection.",
-        default: true, code: "AgentPaneTunables.lostPromptReplay")
-
     public static var all: [TunableDescriptor] {
         [
             agentPairGuard.descriptor,
@@ -440,7 +421,6 @@ public nonisolated struct AgentPaneTunables {
             escapeStopDoublePress.descriptor,
             harnessSwitchInStartedChat.descriptor,
             liveLineBelow.descriptor,
-            lostPromptReplay.descriptor,
             modelMenu.descriptor,
             harnessPlacement.descriptor,
             needsYou.descriptor,
@@ -457,7 +437,6 @@ public nonisolated struct AgentPaneTunables {
             nativeSessionInfo.descriptor,
             sidebarPreviewVariant.descriptor,
             scrollerFade.descriptor,
-            sideSessions.descriptor,
             subagentTray.descriptor,
             suggestedTasks.descriptor,
             systemDictation.descriptor,

Packages/macOS/CmuxNext/Sources/CmuxNextApp/Handlers/AgentHandlers.swift

@@ -244,7 +244,6 @@ enum AgentHandlers {
                 run(view)
             })
         }
-        registry.publishSideSessions()
         registry.bind("agentPane.createCheckpoint", run: { invocation in
             guard invocation.allowsViewChange else {
                 return context.refuse(MiscHandlerStrings.checkpointNeedsFocus)

Packages/macOS/CmuxNext/Sources/CmuxNextControl/RegistryControlBridge.swift

@@ -336,6 +336,5 @@ public final class RegistryControlBridge: ControlActionExecutor {
         (.cloudWorkspace, "cloudWorkspace"),
         (.homeChannelsEnabled, "homeChannelsEnabled"),
         (.webViewFocused, "webViewFocused"),
-        (.sideSessions, "sideSessions"),
     ]
 }

Packages/macOS/CmuxNext/Tests/CmuxNextAgentPaneTests/AgentPageCommandTests.swift

@@ -107,7 +107,7 @@ struct AgentPageCommandTests {
         let registry = ActionRegistry.standard()
         registry.context = ActionContext(rawValue: .max)
         let model = AgentPaneModel(host: NoHost(), sessionId: "session-a")
-        var header = AgentPaneHeaderState(sideSessions: false, sessionInfo: false, browserOpensPreview: false)
+        var header = AgentPaneHeaderState(sessionInfo: false, browserOpensPreview: false)
         var hooks = AgentPaneHeaderHooks(run: { _, _ in }, tabState: { header })
         hooks.shown = { header }
         model.header = hooks

Packages/macOS/CmuxNext/Tests/CmuxNextAgentPaneTests/AgentPaneSendPickedFolderPromptTests.swift

@@ -158,7 +158,7 @@ struct AgentPaneSendPickedFolderPromptTests {
         let owner = UUID()
         let recorded = await Task.detached { [journal] in journal.record(entry, owner: owner) }.value
         #expect(recorded)
-        journal.connectionEnded(owner: owner, byDaemon: false)
+        journal.connectionEnded(owner: owner)
         transport.promptJournal = journal
         transport.webModes = { _, _, _ in nil }
         #expect(await transport.pick(pane.folder) == pane.folder)

Packages/macOS/CmuxNext/Tests/CmuxNextAgentPaneTests/AgentPaneSideQuestionAvailabilityTests.swift

@@ -0,0 +1,18 @@
+import CmuxNextActions
+import Testing
+@testable import CmuxNextAgentPane
+
+/// `/btw` side sessions are always on: the palette's Ask a Side Question… needs only a focused
+/// agent chat.
+@Suite
+@MainActor
+struct AgentPaneSideQuestionAvailabilityTests {
+    private static let sideQuestion: ActionID = "agentPane.sideQuestion"
+
+    @Test func aFocusedChatOffersAskASideQuestion() {
+        let registry = ActionRegistry.standard()
+        registry.context = [.agentPaneFocused]
+        #expect(registry.isAvailable(Self.sideQuestion))
+        #expect(!registry.isAvailable(Self.sideQuestion, in: []))
+    }
+}