diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/execution.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/execution.rs
index 58eac5eeb..cfbd8d9a9 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/execution.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/execution.rs
@@ -15,6 +15,10 @@ use tokio::sync::{watch, Notify};
 
 const MAX_PROTOCOL_ITEMS: usize = 2048;
 const MAX_REQUEST_CACHE: usize = 512;
+/// 拒绝原因留痕的条数上限（按 `(method, reason)` 去重后的上限）。
+///
+/// 原因基本是固定的静态分类，上限只是防止宿主错误文本意外发散时无界增长。
+const MAX_DENIED_REASON_LOGS: usize = 64;
 
 /// 逐次审批协议的版本门禁：发行构建只接受捆绑侧车的固定版本；开发构建用宿主自带的 Codex
 /// （Linux 与未 stage 侧车时没有固定版本可用），按 profile 直接跳过该门禁。
@@ -38,6 +42,11 @@ pub(super) fn validate_approval_version(version: &str) -> Result<(), String> {
 }
 
 pub(super) fn denied_response(id: u64, method: &str) -> Value {
+    // 没绑定宿主执行器时一律拒绝。这是「回合没接单 / 适配器已释放」的唯一表现，
+    // 不留痕线上就只剩一个没有原因的 decline。
+    app_log!(
+        "agent.direct_codex.approval.denied reason=no-bound-host-execution-adapter request_id={id} method={method}"
+    );
     denied(id, method)
 }
 
@@ -195,6 +204,8 @@ pub(super) struct ExecutionAdapter {
     turn_failure: Mutex<Option<DirectTurnError>>,
     /// 用户/宿主是否主动要求终止这一轮（界面的「终止」按钮）。用户主动终止不是失败。
     host_stop_requested: AtomicBool,
+    /// 已留痕的拒绝原因（`method\u{1}reason`）。同一回合内同因只记一次，避免模型重试刷屏。
+    denied_reasons_logged: Mutex<HashSet<String>>,
 }
 
 fn identity(value: Option<&Value>) -> Option<&str> {
@@ -313,9 +324,40 @@ impl ExecutionAdapter {
             outcome,
             turn_failure: Mutex::new(None),
             host_stop_requested: AtomicBool::new(false),
+            denied_reasons_logged: Mutex::new(HashSet::new()),
         })
     }
 
+    /// 审批 / 交互被拒的原因留痕。
+    ///
+    /// 宿主拒绝 app-server 的请求时，线上只回一个 `decline`，用户和 Codex 都看不到是哪一道闸门
+    /// 拦下的；原因只在这里落 AppData 日志。`reason` 只接受本模块的静态分类或宿主自己的错误
+    /// 文本，绝不带请求参数、上游正文、路径或凭据。
+    ///
+    /// 同一回合内 `(method, reason)` 只记一次：模型被拒后常反复重试同一动作，逐次记录会把真正
+    /// 有用的诊断刷掉；"这一轮被拒过哪些原因"仍然完整。
+    fn log_denied_reason(&self, method: &str, reason: &str) {
+        let key = format!("{method}\u{1}{reason}");
+        // 拒绝原因留痕不得反过来影响放行判定：锁不可用就放弃记录。
+        let Ok(mut logged) = self.denied_reasons_logged.lock() else {
+            return;
+        };
+        if logged.len() >= MAX_DENIED_REASON_LOGS || !logged.insert(key) {
+            return;
+        }
+        let distinct = logged.len();
+        drop(logged);
+        app_log!(
+            "agent.direct_codex.approval.denied thread_id={} method={method} reason={reason} distinct_reasons={distinct}",
+            self.thread_id
+        );
+    }
+
+    fn denied(&self, id: u64, method: &str, reason: &str) -> Value {
+        self.log_denied_reason(method, reason);
+        denied(id, method)
+    }
+
     pub(super) fn bind_turn(&self, turn_id: &str) -> bool {
         if turn_id.is_empty() || turn_id.len() > 256 {
             return false;
@@ -454,38 +496,38 @@ impl ExecutionAdapter {
 
     pub(super) async fn respond(self: &Arc<Self>, id: u64, method: &str, params: &Value) -> Value {
         if self.closed.load(Ordering::Acquire) || self.is_host_ending() {
-            return denied(id, method);
+            return self.denied(id, method, "session-closed-or-host-ending");
         }
         let fingerprint = cohort_key(method, params);
         let target = {
             let Ok(mut state) = self.state.lock() else {
-                return denied(id, method);
+                return self.denied(id, method, "state-lock-poisoned");
             };
             if !self.matches_scope(&state, params) {
-                return denied(id, method);
+                return self.denied(id, method, "request-out-of-turn-scope");
             }
             if let Some(ticket) = state.tickets.get(&id) {
                 return if ticket.fingerprint == fingerprint {
                     ticket
                         .response
                         .clone()
-                        .unwrap_or_else(|| denied(id, method))
+                        .unwrap_or_else(|| self.denied(id, method, "ticket-without-response"))
                 } else {
-                    denied(id, method)
+                    self.denied(id, method, "request-id-fingerprint-mismatch")
                 };
             }
             // Approval tasks run concurrently; numeric request IDs need not enter
             // this mutex in order. Retain seen IDs rather than rejecting by high-water.
             if state.seen_request_ids.len() >= 8192 || !state.seen_request_ids.insert(id) {
-                return denied(id, method);
+                return self.denied(id, method, "request-id-replayed-or-capacity");
             }
             let target = match method {
                 "item/commandExecution/requestApproval" | "item/fileChange/requestApproval" => {
                     let Some(item_id) = identity(params.get("itemId")) else {
-                        return denied(id, method);
+                        return self.denied(id, method, "approval-without-item-id");
                     };
                     let Some(item) = state.items.get(item_id) else {
-                        return denied(id, method);
+                        return self.denied(id, method, "approval-for-unknown-item");
                     };
                     let expected = if method == "item/fileChange/requestApproval" {
                         ItemKind::Patch
@@ -493,10 +535,10 @@ impl ExecutionAdapter {
                         ItemKind::Command
                     };
                     if item.kind != expected || item.terminal.is_some() || item.lease.is_some() {
-                        return denied(id, method);
+                        return self.denied(id, method, "item-not-pending-for-approval");
                     }
                     if state.tickets.values().any(|ticket| matches!(&ticket.target, Target::Item(existing, _) if existing == item_id)) {
-                        return denied(id, method);
+                        return self.denied(id, method, "item-approval-already-pending");
                     }
                     Target::Item(
                         item_id.to_string(),
@@ -514,20 +556,20 @@ impl ExecutionAdapter {
                         != Some("mcp_tool_call")
                         || params.get("mode").and_then(Value::as_str) != Some("form")
                     {
-                        return denied(id, method);
+                        return self.denied(id, method, "unsupported-mcp-elicitation-shape");
                     }
                     let Some(server) = params.get("serverName").and_then(Value::as_str) else {
-                        return denied(id, method);
+                        return self.denied(id, method, "mcp-elicitation-without-server-name");
                     };
                     if server == "agc_tools" || !self.third_party_servers.contains(server) {
-                        return denied(id, method);
+                        return self.denied(id, method, "mcp-server-not-eligible-for-elicitation");
                     }
                     let Some(arguments) = params.pointer("/_meta/tool_params") else {
-                        return denied(id, method);
+                        return self.denied(id, method, "mcp-elicitation-without-tool-params");
                     };
                     let key = cohort_key(server, arguments);
                     let Some(cohort) = state.cohorts.get(&key) else {
-                        return denied(id, method);
+                        return self.denied(id, method, "mcp-cohort-not-registered");
                     };
                     let pending_members = cohort
                         .members
@@ -541,12 +583,12 @@ impl ExecutionAdapter {
                         .count();
                     let seen_tickets = state.tickets.values().filter(|ticket| matches!(&ticket.target, Target::Cohort(existing) if existing == &key)).count();
                     if pending_members == 0 || cohort.members.len() <= seen_tickets {
-                        return denied(id, method);
+                        return self.denied(id, method, "mcp-cohort-already-covered");
                     }
                     state.cohorts.get_mut(&key).unwrap().admissions += 1;
                     Target::Cohort(key)
                 }
-                _ => return denied(id, method),
+                _ => return self.denied(id, method, "unsupported-approval-method"),
             };
             if state.tickets.len() >= MAX_REQUEST_CACHE {
                 state.tickets.retain(|_, ticket| ticket.response.is_none());
@@ -592,13 +634,17 @@ impl ExecutionAdapter {
         })
         .await
         .unwrap_or_else(|_| Err("执行许可任务中断".into()));
+        // 闸门拒绝（合同缺失 / 预算耗尽 / 阶段已收束 / 同一输入重复受理…）的真实原因只在
+        // `admitted` 里；它随后会被 move 掉，先取副本，供最后统一留痕。
+        let admit_failure = admitted.as_ref().err().cloned();
         let mut allowed = false;
         let mut rejected_lease = None;
+        let mut denied_reason = None;
         let entries = {
             let Ok(mut state) = self.state.lock() else {
                 self.settling.fetch_sub(1, Ordering::AcqRel);
                 self.changed.notify_waiters();
-                return denied(id, method);
+                return self.denied(id, method, "state-lock-poisoned-after-admit");
             };
             if let Target::Cohort(key) = &target {
                 if let Some(cohort) = state.cohorts.get_mut(key) {
@@ -617,6 +663,7 @@ impl ExecutionAdapter {
                                 item.lease = Some(entry);
                                 allowed = true;
                             } else {
+                                denied_reason = Some("item-left-pending-before-lease-attach");
                                 rejected_lease = Some(entry);
                             }
                         }
@@ -625,11 +672,13 @@ impl ExecutionAdapter {
                                 cohort.leases.push(entry);
                                 allowed = true;
                             } else {
+                                denied_reason = Some("cohort-gone-before-lease-attach");
                                 rejected_lease = Some(entry);
                             }
                         }
                     }
                 } else {
+                    denied_reason = Some("session-closed-before-lease-attach");
                     rejected_lease = Some(entry);
                 }
             }
@@ -652,7 +701,13 @@ impl ExecutionAdapter {
         if allowed {
             accepted(id, method)
         } else {
-            denied(id, method)
+            // 每个请求只留一条：admit 失败优先用宿主的真实错误文本，其次是租约附着阶段的分类。
+            let reason = match (admit_failure, denied_reason) {
+                (Some(error), _) => format!("lease-admit-failed: {error}"),
+                (None, Some(reason)) => reason.to_string(),
+                (None, None) => "lease-not-granted".to_string(),
+            };
+            self.denied(id, method, &reason)
         }
     }
 
@@ -695,6 +750,11 @@ impl ExecutionAdapter {
     }
 
     pub(super) fn response_write_failed(self: &Arc<Self>) {
+        // 回包写不出去时 Codex 侧等不到 decision，表现为「审批没有回应」；与主动 decline 分开留痕。
+        app_log!(
+            "agent.direct_codex.approval.response_write_failed thread_id={}",
+            self.thread_id
+        );
         let adapter = Arc::clone(self);
         tokio::spawn(async move {
             adapter
@@ -1689,4 +1749,35 @@ mod tests {
         );
         assert!(denied(5, "item/tool/call").get("error").is_some());
     }
+
+    #[tokio::test]
+    async fn denied_approval_records_its_reason_once_per_turn() {
+        let (_temp, adapter) = fixture();
+        let method = "item/commandExecution/requestApproval";
+        assert_eq!(
+            adapter.respond(1, method, &approval("missing")).await["result"]["decision"],
+            "decline"
+        );
+        // 线上只回 decline；原因必须留在适配器上，供 AppData 日志回查是哪一道闸门拦下的。
+        let key = format!("{method}\u{1}approval-for-unknown-item");
+        assert!(adapter.denied_reasons_logged.lock().unwrap().contains(&key));
+        // 模型重试同一动作会换新的 request id，但同一回合同因只留一条。
+        assert_eq!(
+            adapter.respond(2, method, &approval("missing")).await["result"]["decision"],
+            "decline"
+        );
+        assert_eq!(adapter.denied_reasons_logged.lock().unwrap().len(), 1);
+    }
+
+    #[test]
+    fn denied_reason_logging_is_bounded() {
+        let (_temp, adapter) = fixture();
+        for index in 0..(MAX_DENIED_REASON_LOGS + 8) {
+            adapter.log_denied_reason("unsupported-approval-method", &format!("reason-{index}"));
+        }
+        assert_eq!(
+            adapter.denied_reasons_logged.lock().unwrap().len(),
+            MAX_DENIED_REASON_LOGS
+        );
+    }
 }
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index a7b1adf7e..ab53e88d6 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -1,5 +1,13 @@
 # 决策记录
 
+## 2026-10-01 DirectProject 审批拒绝原因留痕
+
+- 决策：宿主拒绝 app-server 的审批 / 交互请求时，原因必须落 AppData `RUST` 日志。稳定键 `agent.direct_codex.approval.denied`，字段为 `thread_id` / `method` / `reason` / `distinct_reasons`；未绑定宿主执行器时 `reason=no-bound-host-execution-adapter`，回包写入失败另记 `agent.direct_codex.approval.response_write_failed`。
+- 原因：线上对审批只回 `{"decision":"decline"}`，模型与用户都看不到是哪一道闸门（合同缺失 / 预算耗尽 / 阶段已收束 / item 不在途 / 无适配器）拦下的，只能靠复现。
+- 边界：`reason` 只接受 `execution.rs` 内的静态分类或宿主自己的错误文本，不带请求参数、上游正文、路径或凭据；同一回合内 `(method, reason)` 只记一次，最多 `MAX_DENIED_REASON_LOGS = 64` 条。
+- 影响范围：`apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/execution.rs`。
+- 验证：`cargo test --bin genarrative-ai-game-creator-shell agent::codex_app_server::execution::tests`（15 passed，含 `denied_approval_records_its_reason_once_per_turn`、`denied_reason_logging_is_bounded`）、`npm run check:encoding`、`git diff --check`。
+
 ## 2026-09-30 release 渠道移除产品名与包名后缀
 
 - 决策：`release` 渠道的正式产品名统一为 `陶泥儿`，Windows NSIS、macOS DMG / updater 归档等由 Tauri `productName` 派生的包名不再包含 `Release` 文本；`identifier=world.genarrative.ai-game-creator.release` 与 `release-win` 更新分区保持不变。