feat: Queue vs Steer follow-up parity with intent shortcuts

AGENTS.md

@@ -76,6 +76,16 @@ Use project aliases for frontend imports:
 
 For broader path maps, use `docs/codebase-map.md`.
 
+## Follow-up Behavior Map
+
+For Queue vs Steer follow-up behavior, start here:
+
+- Settings model + defaults: `src/types.ts`, `src/features/settings/hooks/useAppSettings.ts`
+- Settings persistence/migration: `src-tauri/src/types.rs`, `src-tauri/src/storage.rs`
+- Composer runtime behavior: `src/features/composer/components/Composer.tsx`
+- Send intent routing: `src/features/threads/hooks/useQueuedSend.ts`, `src/features/threads/hooks/useThreadMessaging.ts`
+- App/layout wiring: `src/features/app/hooks/useComposerController.ts`, `src/features/layout/hooks/layoutNodes/buildPrimaryNodes.tsx`, `src/App.tsx`
+
 ## App/Daemon Parity Checklist
 
 When changing backend behavior that can run remotely:

README.md

@@ -17,7 +17,8 @@ CodexMonitor is a Tauri app for orchestrating multiple Codex agents across local
 
 ### Composer & Agent Controls
 
-- Compose with queueing plus image attachments (picker, drag/drop, paste).
+- Compose with image attachments (picker, drag/drop, paste) and configurable follow-up behavior (`Queue` vs `Steer` while a run is active).
+- Use `Shift+Cmd+Enter` (macOS) or `Shift+Ctrl+Enter` (Windows/Linux) to send the opposite follow-up action for a single message.
 - Autocomplete for skills (`$`), prompts (`/prompts:`), reviews (`/review`), and file paths (`@`).
 - Model picker, collaboration modes (when enabled), reasoning effort, access mode, and context usage ring.
 - Dictation with hold-to-talk shortcuts and live waveform (Whisper).
@@ -250,8 +251,8 @@ src-tauri/
 ## Notes
 
 - Workspaces persist to `workspaces.json` under the app data directory.
-- App settings persist to `settings.json` under the app data directory (theme, backend mode/provider, remote endpoints/tokens, Codex path, default access mode, UI scale).
-- Feature settings are supported in the UI and synced to `$CODEX_HOME/config.toml` (or `~/.codex/config.toml`) on load/save. Stable: Collaboration modes (`features.collaboration_modes`), personality (`personality`), Steer mode (`features.steer`), and Background terminal (`features.unified_exec`). Experimental: Apps (`features.apps`).
+- App settings persist to `settings.json` under the app data directory (theme, backend mode/provider, remote endpoints/tokens, Codex path, default access mode, UI scale, follow-up message behavior).
+- Feature settings are supported in the UI and synced to `$CODEX_HOME/config.toml` (or `~/.codex/config.toml`) on load/save. Stable: Collaboration modes (`features.collaboration_modes`), personality (`personality`), and Background terminal (`features.unified_exec`). Experimental: Apps (`features.apps`). Steering capability still follows Codex `features.steer`, but follow-up default behavior is controlled in Settings → Composer.
 - On launch and on window focus, the app reconnects and refreshes thread lists for each workspace.
 - Threads are restored by filtering `thread/list` results using the workspace `cwd`.
 - Selecting a thread always calls `thread/resume` to refresh messages from disk.

docs/app-server-events.md

@@ -125,7 +125,7 @@ These are v2 request methods CodexMonitor currently sends to Codex app-server:
 - `thread/compact/start`
 - `thread/name/set`
 - `turn/start`
-- `turn/steer` (best-effort; falls back to `turn/start` when unsupported)
+- `turn/steer` (used for explicit steer follow-ups while a turn is active)
 - `turn/interrupt`
 - `review/start`
 - `model/list`
@@ -253,9 +253,9 @@ Use this when the method list is unchanged but behavior looks off.
   - Stored in `useThreadsReducer.ts` (`turnDiffByThread`)
   - Exposed by `useThreads.ts` for UI consumers
 - Steering behavior while a turn is processing:
-  - CodexMonitor attempts `turn/steer` when steering is enabled and an active turn exists.
-  - If the server/daemon reports unknown `turn/steer`/`turn_steer`, CodexMonitor
-    degrades to `turn/start` and caches that workspace as steer-unsupported.
+  - CodexMonitor attempts `turn/steer` only when steer capability is enabled, the thread is processing, and an active turn id exists.
+  - If `turn/steer` fails, CodexMonitor does not fall back to `turn/start`; it clears stale processing/turn state when applicable, surfaces an error, and returns `steer_failed`.
+  - Local queue fallback on `steer_failed` is handled in the composer queued-send flow (`useQueuedSend`), not by all direct `sendUserMessageToThread` callers.
 - Feature toggles in Settings:
   - `experimentalFeature/list` is an app-server request.
   - Toggle writes use local/daemon command surfaces (`set_codex_feature_flag` and app settings update),

src-tauri/src/storage.rs

@@ -29,11 +29,13 @@ pub(crate) fn read_settings(path: &PathBuf) -> Result<AppSettings, String> {
         return Ok(AppSettings::default());
     }
     let data = std::fs::read_to_string(path).map_err(|e| e.to_string())?;
-    match serde_json::from_str(&data) {
+    let mut value: Value = serde_json::from_str(&data).map_err(|e| e.to_string())?;
+    migrate_follow_up_message_behavior(&mut value);
+    match serde_json::from_value(value.clone()) {
         Ok(settings) => Ok(settings),
         Err(_) => {
-            let mut value: Value = serde_json::from_str(&data).map_err(|e| e.to_string())?;
             sanitize_remote_settings_for_tcp_only(&mut value);
+            migrate_follow_up_message_behavior(&mut value);
             serde_json::from_value(value).map_err(|e| e.to_string())
         }
     }
@@ -72,6 +74,24 @@ fn sanitize_remote_settings_for_tcp_only(value: &mut Value) {
     root.retain(|key, _| !key.to_ascii_lowercase().starts_with("orb"));
 }
 
+fn migrate_follow_up_message_behavior(value: &mut Value) {
+    let Value::Object(root) = value else {
+        return;
+    };
+    if root.contains_key("followUpMessageBehavior") {
+        return;
+    }
+    let steer_enabled = root
+        .get("steerEnabled")
+        .or_else(|| root.get("experimentalSteerEnabled"))
+        .and_then(Value::as_bool)
+        .unwrap_or(true);
+    root.insert(
+        "followUpMessageBehavior".to_string(),
+        Value::String(if steer_enabled { "steer" } else { "queue" }.to_string()),
+    );
+}
+
 #[cfg(test)]
 mod tests {
     use super::{read_settings, read_workspaces, write_workspaces};
@@ -154,4 +174,64 @@ mod tests {
         ));
         assert_eq!(settings.theme, "dark");
     }
+
+    #[test]
+    fn read_settings_migrates_follow_up_behavior_from_legacy_steer_enabled_true() {
+        let temp_dir = std::env::temp_dir().join(format!("codex-monitor-test-{}", Uuid::new_v4()));
+        std::fs::create_dir_all(&temp_dir).expect("create temp dir");
+        let path = temp_dir.join("settings.json");
+
+        std::fs::write(
+            &path,
+            r#"{
+  "steerEnabled": true,
+  "theme": "dark"
+}"#,
+        )
+        .expect("write settings");
+
+        let settings = read_settings(&path).expect("read settings");
+        assert!(settings.steer_enabled);
+        assert_eq!(settings.follow_up_message_behavior, "steer");
+    }
+
+    #[test]
+    fn read_settings_migrates_follow_up_behavior_from_legacy_steer_enabled_false() {
+        let temp_dir = std::env::temp_dir().join(format!("codex-monitor-test-{}", Uuid::new_v4()));
+        std::fs::create_dir_all(&temp_dir).expect("create temp dir");
+        let path = temp_dir.join("settings.json");
+
+        std::fs::write(
+            &path,
+            r#"{
+  "steerEnabled": false,
+  "theme": "dark"
+}"#,
+        )
+        .expect("write settings");
+
+        let settings = read_settings(&path).expect("read settings");
+        assert!(!settings.steer_enabled);
+        assert_eq!(settings.follow_up_message_behavior, "queue");
+    }
+
+    #[test]
+    fn read_settings_keeps_existing_follow_up_behavior() {
+        let temp_dir = std::env::temp_dir().join(format!("codex-monitor-test-{}", Uuid::new_v4()));
+        std::fs::create_dir_all(&temp_dir).expect("create temp dir");
+        let path = temp_dir.join("settings.json");
+
+        std::fs::write(
+            &path,
+            r#"{
+  "steerEnabled": true,
+  "followUpMessageBehavior": "queue",
+  "theme": "dark"
+}"#,
+        )
+        .expect("write settings");
+
+        let settings = read_settings(&path).expect("read settings");
+        assert_eq!(settings.follow_up_message_behavior, "queue");
+    }
 }

src-tauri/src/types.rs

@@ -556,6 +556,11 @@ pub(crate) struct AppSettings {
         alias = "experimentalSteerEnabled"
     )]
     pub(crate) steer_enabled: bool,
+    #[serde(
+        default = "default_follow_up_message_behavior",
+        rename = "followUpMessageBehavior"
+    )]
+    pub(crate) follow_up_message_behavior: String,
     #[serde(
         default = "default_pause_queued_messages_when_response_required",
         rename = "pauseQueuedMessagesWhenResponseRequired"
@@ -905,6 +910,10 @@ fn default_steer_enabled() -> bool {
     true
 }
 
+fn default_follow_up_message_behavior() -> String {
+    "queue".to_string()
+}
+
 fn default_pause_queued_messages_when_response_required() -> bool {
     true
 }
@@ -1145,6 +1154,7 @@ impl Default for AppSettings {
             commit_message_model_id: None,
             collaboration_modes_enabled: true,
             steer_enabled: true,
+            follow_up_message_behavior: default_follow_up_message_behavior(),
             pause_queued_messages_when_response_required:
                 default_pause_queued_messages_when_response_required(),
             unified_exec_enabled: true,
@@ -1306,6 +1316,7 @@ mod tests {
         assert!(settings.commit_message_prompt.contains("{diff}"));
         assert!(settings.collaboration_modes_enabled);
         assert!(settings.steer_enabled);
+        assert_eq!(settings.follow_up_message_behavior, "queue");
         assert!(settings.pause_queued_messages_when_response_required);
         assert!(settings.unified_exec_enabled);
         assert!(!settings.experimental_apps_enabled);

src/App.tsx

@@ -1348,6 +1348,7 @@ function MainApp() {
   const activeTurnId = activeThreadId
     ? activeTurnIdByThread[activeThreadId] ?? null
     : null;
+  const steerAvailable = appSettings.steerEnabled && Boolean(activeTurnId);
   const hasUserInputRequestForActiveThread = Boolean(
     activeThreadId &&
       userInputRequests.some(
@@ -1393,7 +1394,6 @@ function MainApp() {
     removeImagesForThread,
     activeQueue,
     handleSend,
-    queueMessage,
     prefillDraft,
     setPrefillDraft,
     composerInsert,
@@ -1413,6 +1413,7 @@ function MainApp() {
     isReviewing,
     queueFlushPaused,
     steerEnabled: appSettings.steerEnabled,
+    followUpMessageBehavior: appSettings.followUpMessageBehavior,
     appsEnabled: appSettings.experimentalAppsEnabled,
     connectWorkspace,
     startThreadForWorkspace,
@@ -1792,7 +1793,6 @@ function MainApp() {
     composerContextActions,
     composerSendLabel,
     handleComposerSend,
-    handleComposerQueue,
   } = usePullRequestComposer({
     activeWorkspace,
     selectedPullRequest,
@@ -1812,12 +1812,10 @@ function MainApp() {
     runPullRequestReview,
     clearActiveImages,
     handleSend,
-    queueMessage,
   });
 
   const {
     handleComposerSendWithDraftStart,
-    handleComposerQueueWithDraftStart,
     handleSelectWorkspaceInstance,
     handleOpenThreadLink,
     handleArchiveActiveThread,
@@ -1830,7 +1828,6 @@ function MainApp() {
     pendingNewThreadSeedRef,
     runWithDraftStart,
     handleComposerSend,
-    handleComposerQueue,
     clearDraftState,
     exitDiffView,
     resetPullRequestSelection,
@@ -2303,13 +2300,13 @@ function MainApp() {
     onRevealGeneralPrompts: handleRevealGeneralPrompts,
     canRevealGeneralPrompts: Boolean(activeWorkspace),
     onSend: handleComposerSendWithDraftStart,
-    onQueue: handleComposerQueueWithDraftStart,
     onStop: interruptTurn,
     canStop: canInterrupt,
     onFileAutocompleteActiveChange: setFileAutocompleteActive,
     isReviewing,
     isProcessing,
-    steerEnabled: appSettings.steerEnabled,
+    steerAvailable,
+    followUpMessageBehavior: appSettings.followUpMessageBehavior,
     reviewPrompt,
     onReviewPromptClose: closeReviewPrompt,
     onReviewPromptShowPreset: showPresetStep,

src/features/app/hooks/useComposerController.ts

@@ -1,5 +1,12 @@
 import { useCallback, useMemo, useState } from "react";
-import type { AppMention, QueuedMessage, WorkspaceInfo } from "../../../types";
+import type {
+  AppMention,
+  ComposerSendIntent,
+  FollowUpMessageBehavior,
+  QueuedMessage,
+  SendMessageResult,
+  WorkspaceInfo,
+} from "../../../types";
 import { useComposerImages } from "../../composer/hooks/useComposerImages";
 import { useQueuedSend } from "../../threads/hooks/useQueuedSend";
 
@@ -12,6 +19,7 @@ export function useComposerController({
   isReviewing,
   queueFlushPaused = false,
   steerEnabled,
+  followUpMessageBehavior,
   appsEnabled,
   connectWorkspace,
   startThreadForWorkspace,
@@ -33,6 +41,7 @@ export function useComposerController({
   isReviewing: boolean;
   queueFlushPaused?: boolean;
   steerEnabled: boolean;
+  followUpMessageBehavior: FollowUpMessageBehavior;
   appsEnabled: boolean;
   connectWorkspace: (workspace: WorkspaceInfo) => Promise<void>;
   startThreadForWorkspace: (
@@ -43,13 +52,14 @@ export function useComposerController({
     text: string,
     images?: string[],
     appMentions?: AppMention[],
-  ) => Promise<void>;
+    options?: { sendIntent?: ComposerSendIntent },
+  ) => Promise<{ status: "sent" | "blocked" | "steer_failed" }>;
   sendUserMessageToThread: (
     workspace: WorkspaceInfo,
     threadId: string,
     text: string,
     images?: string[],
-  ) => Promise<void>;
+  ) => Promise<void | SendMessageResult>;
   startFork: (text: string) => Promise<void>;
   startReview: (text: string) => Promise<void>;
   startResume: (text: string) => Promise<void>;
@@ -88,6 +98,7 @@ export function useComposerController({
     isReviewing,
     queueFlushPaused,
     steerEnabled,
+    followUpMessageBehavior,
     appsEnabled,
     activeWorkspace,
     connectWorkspace,

src/features/app/hooks/usePlanReadyActions.ts

@@ -1,5 +1,9 @@
 import { useCallback } from "react";
-import type { CollaborationModeOption, WorkspaceInfo } from "../../../types";
+import type {
+  CollaborationModeOption,
+  SendMessageResult,
+  WorkspaceInfo,
+} from "../../../types";
 import {
   makePlanReadyAcceptMessage,
   makePlanReadyChangesMessage,
@@ -15,7 +19,7 @@ type SendUserMessageToThread = (
   message: string,
   imageIds: string[],
   options?: SendUserMessageOptions,
-) => Promise<void>;
+) => Promise<void | SendMessageResult>;
 
 type UsePlanReadyActionsOptions = {
   activeWorkspace: WorkspaceInfo | null;