diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs
index 82f852bea..d1fa67463 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs
@@ -302,8 +302,14 @@ pub(crate) fn ensure_plan_gdd_approval_pending_after_acceptance_locked(
     if agent_id != GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID || run_id.trim().is_empty() {
         return Ok(PlanGddAcceptanceGateOutcome::NotApplicable);
     }
+    // 先识别、后校验。`read_..._binding`（不带 `_once`）会遍历并校验整条祖先链，
+    // 把它排在识别前面，等于让任何祖先绑定的毛病都抢先变成 Err——连「这根本不是
+    // 策划根」都来不及说，于是别人的坏链变成了这道门的失败。`agent.run_status`
+    // 每次都会重跑本门，带父链的非策划 supervisor run 因此会被误伤。P4
+    // （`cb5af31e7`）已在同文件的 `plan_root_completion_identity_at` 修过同一形状，
+    // 当时漏了这个姊妹函数。识别只看 run 自己那条绑定记录。
     let Some(binding) =
-        read_game_creator_agent_runtime_run_profile_binding(root, agent_id, run_id)?
+        read_game_creator_agent_runtime_run_profile_binding_once(root, agent_id, run_id.trim())?
     else {
         return Ok(PlanGddAcceptanceGateOutcome::NotApplicable);
     };
@@ -313,6 +319,8 @@ pub(crate) fn ensure_plan_gdd_approval_pending_after_acceptance_locked(
     if binding.profile != AGENT_RUNTIME_RUN_PROFILE_STANDARD {
         return Err("Fast GDD acceptance gate 的 plan 根 Run Profile 已漂移".to_string());
     }
+    // 确认是策划根之后才走完整父链：严格度一点没降，只是不再作用到别人身上。
+    read_game_creator_agent_runtime_run_profile_binding(root, agent_id, run_id)?;
     let gdds = read_plan_gdd_chain_locked(root).map_err(|error| error.to_string())?;
     let Some(gdd) = latest_plan_gdd_for_root(&gdds, run_id) else {
         // A contract may be updated before the planning child has submitted a
@@ -2167,4 +2175,68 @@ mod tests {
         );
         let _ = fs::remove_dir_all(root);
     }
+
+    /// 同一形状的第二处：验收前置门。它比完成门更容易被踩到——`agent.run_status`
+    /// 每次 status observation 都会重跑这道门（见 `runtime_tools/run_status.rs` 的
+    /// 「Re-run the locked gate on every plan-root status observation」），而那条路径
+    /// 上没有任何上游守卫先把带父链的 run 挡掉，适用性完全交给门自己判。所以门必须
+    /// 先说得出「这不是策划根」，才轮到校验祖先链。
+    #[test]
+    fn broken_ancestor_binding_must_not_fail_the_acceptance_gate_for_a_non_plan_supervisor_run() {
+        let root = std::env::temp_dir().join(format!(
+            "genarrative-plan-acceptance-gate-identity-{}",
+            uuid::Uuid::new_v4().simple()
+        ));
+        init_local_game_project_at(
+            &root,
+            "project-test-acceptance-gate",
+            "acceptance gate identity",
+        )
+        .expect("init project");
+
+        let parent_run_id = "acceptance-gate-isolated-join-parent";
+        let child_run_id = "acceptance-gate-isolated-join-child";
+        bind_game_creator_agent_runtime_run_profile_at(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            parent_run_id,
+            AGENT_RUNTIME_SUPERVISOR_PLAN_SOURCE,
+            Some(AGENT_RUNTIME_RUN_PROFILE_STANDARD),
+            None,
+        )
+        .expect("bind ancestor run");
+        bind_game_creator_agent_runtime_run_profile_at(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            child_run_id,
+            AGENT_RUNTIME_ISOLATED_JOIN_SOURCE,
+            Some(AGENT_RUNTIME_RUN_PROFILE_STANDARD),
+            Some(&AgentRuntimeTaskLink {
+                parent_agent_id: Some(GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID.to_string()),
+                parent_run_id: Some(parent_run_id.to_string()),
+                delegation_id: None,
+            }),
+        )
+        .expect("bind isolated-join child run");
+
+        fs::remove_file(game_creator_agent_runtime_run_profile_binding_path(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            parent_run_id,
+        ))
+        .expect("remove ancestor binding");
+
+        let outcome = ensure_plan_gdd_approval_pending_after_acceptance_locked(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            child_run_id,
+        );
+        assert!(
+            matches!(outcome, Ok(PlanGddAcceptanceGateOutcome::NotApplicable)),
+            "isolated-join run 的 source 不是立项策划，验收前置门只能判 NotApplicable，\
+             不能因为别人的祖先链坏掉就让整个 agent.run_status 失败：{:?}",
+            outcome.map(|outcome| format!("{outcome:?}"))
+        );
+        let _ = fs::remove_dir_all(root);
+    }
 }