diff --git a/apps/codex-plus-manager/src/App.tsx b/apps/codex-plus-manager/src/App.tsx
index 11a2c709b..32e72cc5c 100644
--- a/apps/codex-plus-manager/src/App.tsx
+++ b/apps/codex-plus-manager/src/App.tsx
@@ -172,6 +172,7 @@ type BackendSettings = {
   codexAppImageOverlayOpacity: number;
   codexAppImageOverlayFitMode: ImageOverlayFitMode;
   codexGoalsEnabled: boolean;
+  codexAppGoalResumeGuard: boolean;
   launchMode: LaunchMode;
   relayBaseUrl: string;
   relayApiKey: string;
@@ -694,6 +695,7 @@ const defaultSettings: BackendSettings = {
   codexAppImageOverlayOpacity: 35,
   codexAppImageOverlayFitMode: "fit",
   codexGoalsEnabled: false,
+  codexAppGoalResumeGuard: false,
   launchMode: "patch",
   relayBaseUrl: "",
   relayApiKey: "",
@@ -3937,7 +3939,7 @@ function RelayProfileDetail({
           </Button>
         </Toolbar>
       </div>
-        <RelayProfileEditor profile={draft} form={form} isNew={isNew} onProfileChange={setDraft} onSwitch={switchDraft} actions={actions} modelWindowRows={modelWindowRows} setModelWindowRows={setModelWindowRows} />
+        <RelayProfileEditor profile={draft} form={form} isNew={isNew} onFormChange={onFormChange} onProfileChange={setDraft} onSwitch={switchDraft} actions={actions} modelWindowRows={modelWindowRows} setModelWindowRows={setModelWindowRows} />
       {isAggregateRelayProfile(draft) ? null : (
       <RelayFileEditors
         contextProfile={profile}
@@ -3987,6 +3989,7 @@ function RelayProfileEditor({
   profile,
   form,
   isNew = false,
+  onFormChange,
   onProfileChange,
   onSwitch,
   actions,
@@ -3996,6 +3999,7 @@ function RelayProfileEditor({
   profile: RelayProfile;
   form: BackendSettings;
   isNew?: boolean;
+  onFormChange: (value: BackendSettings) => void;
   onProfileChange: (value: RelayProfile) => void;
   onSwitch: () => void;
   actions: Actions;
@@ -4116,6 +4120,17 @@ function RelayProfileEditor({
             />
             <span>{t("启用目标功能")}</span>
           </label>
+          <label className="inline-check">
+            <input
+              checked={form.codexAppGoalResumeGuard}
+              onChange={(event) => onFormChange({ ...form, codexAppGoalResumeGuard: event.currentTarget.checked })}
+              type="checkbox"
+            />
+            <span>{t("启用目标续跑保护")}</span>
+          </label>
+          <p className="field-hint">
+            {t("检测到目标上下文时，Codex++ 会在中转请求中追加续跑保护提示，减少压缩后重做旧任务。")}
+          </p>
         </Field>
         <div className="relay-advanced-toggle">
           <Button
@@ -5981,6 +5996,7 @@ function normalizeSettings(settings: BackendSettings): BackendSettings {
     ...settings,
     relayProfilesEnabled: settings.relayProfilesEnabled !== false,
     computerUseGuardEnabled: settings.computerUseGuardEnabled === true,
+    codexAppGoalResumeGuard: settings.codexAppGoalResumeGuard === true,
     codexAppImageOverlayOpacity: clampNumber(settings.codexAppImageOverlayOpacity || 35, 1, 100),
     codexAppImageOverlayFitMode: normalizeImageOverlayFitMode(settings.codexAppImageOverlayFitMode),
     codexAppStepwiseMaxItems: clampNumber(settings.codexAppStepwiseMaxItems ?? 6, 0, 6),
diff --git a/apps/codex-plus-manager/src/i18n-en.ts b/apps/codex-plus-manager/src/i18n-en.ts
index afcb02de2..a7421c766 100644
--- a/apps/codex-plus-manager/src/i18n-en.ts
+++ b/apps/codex-plus-manager/src/i18n-en.ts
@@ -220,6 +220,9 @@ export const EN_PLAIN: Record<string, string> = {
   "启用供应商配置切换": "Enable provider configuration switching",
   "启用此扩展项": "Enable this entry",
   "启用目标功能": "Enable goals feature",
+  "启用目标续跑保护": "Enable goal resume guard",
+  "检测到目标上下文时，Codex++ 会在中转请求中追加续跑保护提示，减少压缩后重做旧任务。":
+    "When goal context is detected, Codex++ appends a resume guard prompt to relay requests to reduce redoing old tasks after compaction.",
   "图片": "Image",
   "图片覆盖层": "Image overlay",
   "在会话列表悬停显示删除按钮，并支持撤销。": "Show a delete button on hover in the session list, with undo support.",
diff --git a/crates/codex-plus-core/src/protocol_proxy.rs b/crates/codex-plus-core/src/protocol_proxy.rs
index 94178394a..a824c7ea1 100644
--- a/crates/codex-plus-core/src/protocol_proxy.rs
+++ b/crates/codex-plus-core/src/protocol_proxy.rs
@@ -18,6 +18,18 @@ const UPSTREAM_HEADER_TIMEOUT: Duration = Duration::from_secs(30);
 const UPSTREAM_STREAM_HEADER_TIMEOUT: Duration = Duration::from_secs(120);
 const THINK_OPEN_TAG: &str = "<think>";
 const THINK_CLOSE_TAG: &str = "</think>";
+const GOAL_RESUME_GUARD_MARKER: &str = "Codex++ Goal Resume Guard";
+const GOAL_RESUME_GUARD_INSTRUCTION: &str = concat!(
+    "Codex++ Goal Resume Guard:\n",
+    "When continuing an active Codex goal after compaction or resume, do not replay older manual ",
+    "steer messages as a fresh task. Treat the newest active goal checkpoint as authoritative. ",
+    "If the workspace contains .codexpp-goal-state.md or GOAL_STATE.md, read it before acting ",
+    "and follow its objective, completed, current_next_step, blockers, do_not_redo, and ",
+    "last_completed_turn_id fields. For long-running goals, update the checkpoint file after ",
+    "each meaningful small batch or completed stage before continuing, so a later resume has ",
+    "the latest progress. If no checkpoint file exists, continue from the newest goal context ",
+    "and avoid redoing completed work unless the user explicitly asks."
+);
 const EXTRA_CHAT_PASSTHROUGH_FIELDS: &[&str] = &[
     "frequency_penalty",
     "logit_bias",
@@ -497,7 +509,10 @@ async fn open_responses_proxy_request_with_settings_and_user_agent(
     settings: crate::settings::BackendSettings,
     original_user_agent: Option<&str>,
 ) -> anyhow::Result<UpstreamProxyResponse> {
-    let request_json: Value = serde_json::from_str(body)?;
+    let mut request_json: Value = serde_json::from_str(body)?;
+    if settings.codex_app_goal_resume_guard {
+        request_json = apply_goal_resume_guard_to_request(request_json);
+    }
     let is_stream = request_json
         .get("stream")
         .and_then(Value::as_bool)
@@ -789,6 +804,88 @@ fn conversation_id_from_responses_request(body: &Value) -> Option<String> {
     None
 }
 
+fn apply_goal_resume_guard_to_request(mut request_json: Value) -> Value {
+    if !request_has_goal_context(&request_json)
+        || value_contains_text(&request_json, GOAL_RESUME_GUARD_MARKER)
+    {
+        return request_json;
+    }
+
+    let Some(object) = request_json.as_object_mut() else {
+        return request_json;
+    };
+    append_goal_resume_guard_instruction(object);
+    request_json
+}
+
+fn append_goal_resume_guard_instruction(object: &mut serde_json::Map<String, Value>) {
+    match object.get_mut("instructions") {
+        Some(Value::String(text)) => {
+            if !text.trim().is_empty() {
+                text.push_str("\n\n");
+            }
+            text.push_str(GOAL_RESUME_GUARD_INSTRUCTION);
+        }
+        Some(Value::Array(parts)) => {
+            parts.push(json!({
+                "type": "input_text",
+                "text": GOAL_RESUME_GUARD_INSTRUCTION
+            }));
+        }
+        Some(other) => {
+            let existing = instruction_text(other);
+            let next = if existing.trim().is_empty() {
+                GOAL_RESUME_GUARD_INSTRUCTION.to_string()
+            } else {
+                format!("{existing}\n\n{GOAL_RESUME_GUARD_INSTRUCTION}")
+            };
+            object.insert("instructions".to_string(), Value::String(next));
+        }
+        None => {
+            object.insert(
+                "instructions".to_string(),
+                Value::String(GOAL_RESUME_GUARD_INSTRUCTION.to_string()),
+            );
+        }
+    }
+}
+
+fn request_has_goal_context(value: &Value) -> bool {
+    match value {
+        Value::Object(object) => {
+            let source = object.get("source").and_then(Value::as_str).unwrap_or("");
+            let kind = object.get("type").and_then(Value::as_str).unwrap_or("");
+            if source.eq_ignore_ascii_case("goal")
+                || kind.eq_ignore_ascii_case("thread_goal")
+                || kind.eq_ignore_ascii_case("goal")
+            {
+                return true;
+            }
+            object.values().any(request_has_goal_context)
+        }
+        Value::Array(items) => items.iter().any(request_has_goal_context),
+        Value::String(text) => text_mentions_goal_context(text),
+        _ => false,
+    }
+}
+
+fn text_mentions_goal_context(text: &str) -> bool {
+    let lower = text.to_ascii_lowercase();
+    (lower.contains("codex_internal_context") && lower.contains("source") && lower.contains("goal"))
+        || lower.contains("thread_goal_updated")
+}
+
+fn value_contains_text(value: &Value, needle: &str) -> bool {
+    match value {
+        Value::String(text) => text.contains(needle),
+        Value::Array(items) => items.iter().any(|item| value_contains_text(item, needle)),
+        Value::Object(object) => object
+            .values()
+            .any(|item| value_contains_text(item, needle)),
+        _ => false,
+    }
+}
+
 fn effective_user_agent(configured_user_agent: &str, original_user_agent: Option<&str>) -> String {
     let configured_user_agent = configured_user_agent.trim();
     if !configured_user_agent.is_empty() {
@@ -3953,3 +4050,71 @@ fn is_openai_o_series(model: &str) -> bool {
             .get(1)
             .is_some_and(|byte| byte.is_ascii_digit())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn goal_resume_guard_appends_to_goal_context_request() {
+        let guarded = apply_goal_resume_guard_to_request(json!({
+            "model": "gpt-5.5",
+            "instructions": "Base instructions.",
+            "input": [{
+                "type": "codex_internal_context",
+                "source": "goal",
+                "text": "Continue the active goal."
+            }]
+        }));
+
+        let instructions = guarded["instructions"].as_str().unwrap();
+        assert!(instructions.contains("Base instructions."));
+        assert!(instructions.contains(GOAL_RESUME_GUARD_MARKER));
+        assert!(instructions.contains(".codexpp-goal-state.md"));
+        assert!(instructions.contains("update the checkpoint file"));
+
+        let chat = responses_to_chat_completions(guarded).unwrap();
+        assert!(
+            chat["messages"][0]["content"]
+                .as_str()
+                .unwrap()
+                .contains(GOAL_RESUME_GUARD_MARKER)
+        );
+    }
+
+    #[test]
+    fn goal_resume_guard_leaves_regular_request_unchanged() {
+        let original = json!({
+            "model": "gpt-5.5",
+            "input": "hello"
+        });
+        let guarded = apply_goal_resume_guard_to_request(original.clone());
+
+        assert_eq!(guarded, original);
+    }
+
+    #[test]
+    fn goal_resume_guard_does_not_duplicate_existing_marker() {
+        let guarded = apply_goal_resume_guard_to_request(json!({
+            "model": "gpt-5.5",
+            "instructions": GOAL_RESUME_GUARD_INSTRUCTION,
+            "input": [{
+                "type": "codex_internal_context",
+                "source": "goal",
+                "text": "Continue the active goal."
+            }]
+        }));
+
+        assert_eq!(
+            guarded["instructions"].as_str().unwrap(),
+            GOAL_RESUME_GUARD_INSTRUCTION
+        );
+    }
+
+    #[test]
+    fn goal_resume_guard_instruction_mentions_incremental_checkpoint_updates() {
+        assert!(GOAL_RESUME_GUARD_INSTRUCTION.contains("long-running goals"));
+        assert!(GOAL_RESUME_GUARD_INSTRUCTION.contains("each meaningful small batch"));
+        assert!(GOAL_RESUME_GUARD_INSTRUCTION.contains("latest progress"));
+    }
+}
diff --git a/crates/codex-plus-core/src/settings.rs b/crates/codex-plus-core/src/settings.rs
index e54611b61..74f88f75c 100644
--- a/crates/codex-plus-core/src/settings.rs
+++ b/crates/codex-plus-core/src/settings.rs
@@ -297,6 +297,8 @@ pub struct BackendSettings {
     pub codex_app_image_overlay_fit_mode: String,
     #[serde(rename = "codexGoalsEnabled", default)]
     pub codex_goals_enabled: bool,
+    #[serde(rename = "codexAppGoalResumeGuard", default)]
+    pub codex_app_goal_resume_guard: bool,
     #[serde(rename = "launchMode", default)]
     pub launch_mode: LaunchMode,
     #[serde(rename = "relayBaseUrl", default = "default_relay_base_url")]
@@ -366,6 +368,7 @@ impl Default for BackendSettings {
             codex_app_image_overlay_opacity: default_image_overlay_opacity(),
             codex_app_image_overlay_fit_mode: default_image_overlay_fit_mode(),
             codex_goals_enabled: false,
+            codex_app_goal_resume_guard: false,
             launch_mode: LaunchMode::Patch,
             relay_base_url: default_relay_base_url(),
             relay_api_key: String::new(),
@@ -906,6 +909,7 @@ fn merge_known_setting_fields(target: &mut Map<String, Value>, source: &Map<Stri
     if let Some(value) = source.get("codexGoalsEnabled").and_then(Value::as_bool) {
         target.insert("codexGoalsEnabled".to_string(), Value::Bool(value));
     }
+    merge_bool_setting(target, source, "codexAppGoalResumeGuard");
     if let Some(value) = source.get("launchMode").and_then(Value::as_str) {
         if matches!(value, "patch" | "relay") {
             target.insert("launchMode".to_string(), Value::String(value.to_string()));
@@ -1225,6 +1229,7 @@ mod tests {
         assert!(!settings.codex_app_thread_id_badge);
         assert!(settings.codex_app_force_chinese_locale);
         assert!(!settings.codex_goals_enabled);
+        assert!(!settings.codex_app_goal_resume_guard);
         assert!(settings.codex_app_path.is_empty());
         assert!(settings.codex_extra_args.is_empty());
         assert_eq!(
@@ -1775,6 +1780,7 @@ experimental_bearer_token = "sk-existing""#
             "codexAppNativeMenuLocalization": false,
             "codexAppServiceTierControls": true,
             "codexGoalsEnabled": true,
+            "codexAppGoalResumeGuard": true,
             "relayBaseUrl": "https://relay.example.test/v1",
             "relayApiKey": "sk-relay",
             "codexExtraArgs": ["--force_high_performance_gpu", "", "  ", " --enable-gpu "],
@@ -1791,6 +1797,7 @@ experimental_bearer_token = "sk-existing""#
         assert!(!updated.codex_app_native_menu_localization);
         assert!(updated.codex_app_service_tier_controls);
         assert!(updated.codex_goals_enabled);
+        assert!(updated.codex_app_goal_resume_guard);
         assert_eq!(updated.relay_base_url, "https://relay.example.test/v1");
         assert_eq!(updated.relay_api_key, "sk-relay");
         assert_eq!(
diff --git a/tools/i18n-keys.json b/tools/i18n-keys.json
index 47899d750..997ea86b5 100644
--- a/tools/i18n-keys.json
+++ b/tools/i18n-keys.json
@@ -180,6 +180,8 @@
     "启用供应商配置切换",
     "启用此扩展项",
     "启用目标功能",
+    "启用目标续跑保护",
+    "检测到目标上下文时，Codex++ 会在中转请求中追加续跑保护提示，减少压缩后重做旧任务。",
     "图片",
     "图片覆盖层",
     "在会话列表悬停显示删除按钮，并支持撤销。",