Centralize persisted resume settings lookup (#39147)

## What changed

- Add a shared helper for recovering the latest persisted approvals reviewer from turn context and thread settings history.
- Use the helper when resuming and forking threads while continuing to honor explicit request overrides.
- Fall back to an older persisted reviewer when the latest turn context omits the field.

## Testing

- Add unit coverage for settings snapshot precedence, turn context precedence, and fallback to an older reviewer.

GitOrigin-RevId: dfc0332b0f1410a4c9a550236eb32624f5133baa

codex-rs/app-server/src/request_processors.rs

@@ -544,6 +544,7 @@ mod git_processor;
 mod initialize_processor;
 mod marketplace_processor;
 mod mcp_processor;
+mod persisted_resume_settings;
 mod plugins;
 mod process_exec_processor;
 mod projects;

codex-rs/app-server/src/request_processors/persisted_resume_settings.rs

@@ -0,0 +1,40 @@
+use codex_protocol::config_types::ApprovalsReviewer;
+use codex_protocol::protocol::EventMsg;
+use codex_rollout::RolloutItem;
+
+#[derive(Debug, PartialEq, Eq)]
+pub(super) struct PersistedResumeSettings {
+    pub(super) approvals_reviewer: Option<ApprovalsReviewer>,
+}
+
+pub(super) fn latest_persisted_resume_settings(
+    history: &[RolloutItem],
+) -> Option<PersistedResumeSettings> {
+    history
+        .iter()
+        .enumerate()
+        .rev()
+        .find_map(|(index, item)| match item {
+            RolloutItem::TurnContext(turn_context) => Some(PersistedResumeSettings {
+                approvals_reviewer: turn_context.approvals_reviewer.or_else(|| {
+                    history[..index].iter().rev().find_map(|item| match item {
+                        RolloutItem::TurnContext(turn_context) => turn_context.approvals_reviewer,
+                        RolloutItem::EventMsg(EventMsg::ThreadSettingsApplied(event)) => {
+                            Some(event.thread_settings.approvals_reviewer)
+                        }
+                        _ => None,
+                    })
+                }),
+            }),
+            RolloutItem::EventMsg(EventMsg::ThreadSettingsApplied(event)) => {
+                Some(PersistedResumeSettings {
+                    approvals_reviewer: Some(event.thread_settings.approvals_reviewer),
+                })
+            }
+            _ => None,
+        })
+}
+
+#[cfg(test)]
+#[path = "persisted_resume_settings_tests.rs"]
+mod tests;

codex-rs/app-server/src/request_processors/persisted_resume_settings_tests.rs

@@ -0,0 +1,120 @@
+use super::PersistedResumeSettings;
+use super::latest_persisted_resume_settings;
+use codex_protocol::config_types::ApprovalsReviewer;
+use codex_protocol::config_types::CollaborationMode;
+use codex_protocol::config_types::ModeKind;
+use codex_protocol::config_types::Settings;
+use codex_protocol::models::PermissionProfile;
+use codex_protocol::protocol::AskForApproval;
+use codex_protocol::protocol::EventMsg;
+use codex_protocol::protocol::SandboxPolicy;
+use codex_protocol::protocol::ThreadSettingsAppliedEvent;
+use codex_protocol::protocol::ThreadSettingsSnapshot;
+use codex_protocol::protocol::TurnContextItem;
+use codex_rollout::RolloutItem;
+use codex_utils_absolute_path::AbsolutePathBuf;
+use pretty_assertions::assert_eq;
+
+fn cwd() -> AbsolutePathBuf {
+    AbsolutePathBuf::try_from(std::env::current_dir().expect("current directory"))
+        .expect("absolute current directory")
+}
+
+fn settings_item(approvals_reviewer: ApprovalsReviewer) -> RolloutItem {
+    RolloutItem::EventMsg(EventMsg::ThreadSettingsApplied(
+        ThreadSettingsAppliedEvent {
+            thread_settings: ThreadSettingsSnapshot {
+                model: "gpt-5".to_string(),
+                model_provider_id: "openai".to_string(),
+                service_tier: None,
+                approval_policy: AskForApproval::OnRequest,
+                approvals_reviewer,
+                permission_profile: PermissionProfile::read_only(),
+                active_permission_profile: None,
+                cwd: cwd(),
+                reasoning_effort: None,
+                reasoning_summary: None,
+                personality: None,
+                collaboration_mode: CollaborationMode {
+                    mode: ModeKind::Default,
+                    settings: Settings {
+                        model: "gpt-5".to_string(),
+                        reasoning_effort: None,
+                        developer_instructions: None,
+                    },
+                },
+            },
+        },
+    ))
+}
+
+fn turn_context_item(turn_id: &str, approvals_reviewer: Option<ApprovalsReviewer>) -> RolloutItem {
+    RolloutItem::TurnContext(TurnContextItem {
+        turn_id: Some(turn_id.to_string()),
+        cwd: cwd(),
+        workspace_roots: None,
+        current_date: None,
+        timezone: None,
+        approval_policy: AskForApproval::OnRequest,
+        approvals_reviewer,
+        sandbox_policy: SandboxPolicy::new_read_only_policy(),
+        permission_profile: None,
+        active_permission_profile: None,
+        network: None,
+        file_system_sandbox_policy: None,
+        model: "gpt-5".to_string(),
+        comp_hash: None,
+        personality: None,
+        collaboration_mode: None,
+        multi_agent_version: None,
+        multi_agent_mode: None,
+        realtime_active: None,
+        effort: None,
+        summary: codex_protocol::config_types::ReasoningSummary::Auto,
+    })
+}
+
+#[test]
+fn latest_settings_snapshot_wins() {
+    let history = vec![
+        settings_item(ApprovalsReviewer::User),
+        settings_item(ApprovalsReviewer::AutoReview),
+    ];
+
+    assert_eq!(
+        latest_persisted_resume_settings(&history),
+        Some(PersistedResumeSettings {
+            approvals_reviewer: Some(ApprovalsReviewer::AutoReview),
+        })
+    );
+}
+
+#[test]
+fn latest_turn_context_wins_over_earlier_settings_update() {
+    let history = vec![
+        settings_item(ApprovalsReviewer::AutoReview),
+        turn_context_item("turn-2", Some(ApprovalsReviewer::User)),
+    ];
+
+    assert_eq!(
+        latest_persisted_resume_settings(&history),
+        Some(PersistedResumeSettings {
+            approvals_reviewer: Some(ApprovalsReviewer::User),
+        })
+    );
+}
+
+#[test]
+fn older_reviewer_is_used_when_latest_turn_context_omits_it() {
+    let history = vec![
+        turn_context_item("turn-1", Some(ApprovalsReviewer::AutoReview)),
+        turn_context_item("turn-2", /*approvals_reviewer*/ None),
+    ];
+
+    assert_eq!(
+        latest_persisted_resume_settings(&history),
+        Some(PersistedResumeSettings {
+            approvals_reviewer: Some(ApprovalsReviewer::AutoReview),
+        })
+    );
+}

codex-rs/app-server/src/request_processors/thread_processor.rs

@@ -1,3 +1,4 @@
+use super::persisted_resume_settings::latest_persisted_resume_settings;
 use super::thread_enrichment::enrich_loaded_threads;
 use super::thread_fork_goal::inherit_thread_goal_snapshot;
 use super::turn_processor::can_accept_direct_input;
@@ -225,26 +226,6 @@ fn merge_persisted_resume_metadata(
     }
 }
 
-fn merge_persisted_approvals_reviewer(
-    history: &[RolloutItem],
-    request_overrides: Option<&HashMap<String, serde_json::Value>>,
-    typesafe_overrides: &mut ConfigOverrides,
-) {
-    if typesafe_overrides.approvals_reviewer.is_some()
-        || request_overrides.is_some_and(|overrides| overrides.contains_key("approvals_reviewer"))
-    {
-        return;
-    }
-
-    typesafe_overrides.approvals_reviewer = history.iter().rev().find_map(|item| match item {
-        RolloutItem::TurnContext(turn_context) => turn_context.approvals_reviewer,
-        RolloutItem::EventMsg(EventMsg::ThreadSettingsApplied(event)) => {
-            Some(event.thread_settings.approvals_reviewer)
-        }
-        _ => None,
-    });
-}
-
 fn latest_persisted_approval_policy(
     history: &[RolloutItem],
 ) -> Option<codex_protocol::protocol::AskForApproval> {
@@ -3950,11 +3931,15 @@ impl ThreadRequestProcessor {
         let InitialHistory::Resumed(resumed_history) = thread_history else {
             return None;
         };
-        merge_persisted_approvals_reviewer(
+        if typesafe_overrides.approvals_reviewer.is_none()
-            &resumed_history.history,
+            && !request_overrides
-            request_overrides.as_ref(),
+                .as_ref()
-            typesafe_overrides,
+                .is_some_and(|overrides| overrides.contains_key("approvals_reviewer"))
-        );
+        {
+            typesafe_overrides.approvals_reviewer =
+                latest_persisted_resume_settings(&resumed_history.history)
+                    .and_then(|settings| settings.approvals_reviewer);
+        }
         if typesafe_overrides.approval_policy.is_none() {
             typesafe_overrides.approval_policy =
                 latest_persisted_approval_policy(&resumed_history.history);
@@ -4711,13 +4696,18 @@ impl ThreadRequestProcessor {
         } else {
             None
         };
-        merge_persisted_approvals_reviewer(
+        if typesafe_overrides.approvals_reviewer.is_none()
+            && !request_overrides
+                .as_ref()
+                .is_some_and(|overrides| overrides.contains_key("approvals_reviewer"))
+        {
+            typesafe_overrides.approvals_reviewer = latest_persisted_resume_settings(
                 latest_context
                     .as_deref()
                     .unwrap_or_else(|| source_history_items.as_ref()),
-            request_overrides.as_ref(),
+            )
-            &mut typesafe_overrides,
+            .and_then(|settings| settings.approvals_reviewer);
-        );
+        }
         // Derive a Config using the same logic as new conversation, honoring overrides if provided.
         let config = self
             .config_manager