diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
index 36cb6127a..8c17fd38b 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
@@ -3555,7 +3555,7 @@ fn direct_codex_generated_source() -> GameCreationAppAssetSource {
     }
 }
 
-fn direct_codex_output_fingerprint(root: &Path) -> String {
+fn direct_codex_output_fingerprint_checked(root: &Path) -> Result<String, String> {
     let mut hasher = Sha256::new();
     let mut paths: Vec<String> = direct_codex_game_outputs(root)
         .into_iter()
@@ -3568,16 +3568,27 @@ fn direct_codex_output_fingerprint(root: &Path) -> String {
         hasher.update(local_path.as_bytes());
         hasher.update([0]);
         let path = root.join(local_path);
-        match std::fs::read(path) {
+        match std::fs::read(&path) {
             Ok(bytes) => {
                 hasher.update([1]);
                 hasher.update((bytes.len() as u64).to_le_bytes());
                 hasher.update(bytes);
             }
-            Err(_) => hasher.update([0]),
+            Err(error) if error.kind() == std::io::ErrorKind::NotFound => hasher.update([0]),
+            Err(error) => {
+                return Err(format!(
+                    "读取直连 Codex 输出文件失败：{}：{error}",
+                    path.display()
+                ));
+            }
         }
     }
-    format!("{:x}", hasher.finalize())
+    Ok(format!("{:x}", hasher.finalize()))
+}
+
+#[cfg(test)]
+fn direct_codex_output_fingerprint(root: &Path) -> String {
+    direct_codex_output_fingerprint_checked(root).expect("读取直连 Codex 输出指纹")
 }
 
 fn direct_npm_source_paths(root: &Path) -> Vec<String> {
@@ -4116,7 +4127,7 @@ fn sync_direct_codex_project_file_projection_at(
     root: &Path,
     previous_output_fingerprint: Option<&str>,
 ) -> Result<(), String> {
-    let current_output_fingerprint = direct_codex_output_fingerprint(root);
+    let current_output_fingerprint = direct_codex_output_fingerprint_checked(root)?;
     let outputs_changed = previous_output_fingerprint
         .map(|previous| previous != current_output_fingerprint)
         .unwrap_or(true);
@@ -4554,7 +4565,8 @@ async fn run_direct_game_creator_turn_inner(
         let stream_enabled = load_game_creator_app_config()
             .map(|config| config.llm.stream)
             .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
-        let previous_output_fingerprint = direct_codex_output_fingerprint(root);
+        let previous_output_fingerprint = direct_codex_output_fingerprint_checked(root)
+            .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
         let base_system_prompt =
             build_direct_codex_system_prompt_with_creation_type(root, creation_type)
                 .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
@@ -4748,7 +4760,9 @@ async fn run_direct_game_creator_turn_inner(
         if let Some(emitter) = turn_emitter {
             emitter.emit("finalizing", Some("response-finalization"));
         }
-        if direct_codex_output_fingerprint(root) != previous_output_fingerprint {
+        let current_output_fingerprint = direct_codex_output_fingerprint_checked(root)
+            .map_err(|error| TurnError::turn_failed(FailureStage::VersionRegistration, error))?;
+        if current_output_fingerprint != previous_output_fingerprint {
             emit_direct_game_creator_progress(
                 root,
                 "project.sync",
@@ -4894,7 +4908,8 @@ async fn run_direct_game_creator_turn_with_private_editor_credentials(
             .await
             .map_err(|error| TurnError::turn_failed(FailureStage::ArtPreparation, error))?;
     }
-    let previous_output_fingerprint = direct_codex_output_fingerprint(root);
+    let previous_output_fingerprint = direct_codex_output_fingerprint_checked(root)
+        .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
     let mut system_prompt = build_direct_codex_system_prompt(root)
         .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
     if prepare_art {
@@ -4906,7 +4921,8 @@ async fn run_direct_game_creator_turn_with_private_editor_credentials(
     }
     let _initial_reply =
         direct_game_creator_codex_chat_at(root, system_prompt.clone(), prompt.to_string()).await?;
-    let initial_output_fingerprint = direct_codex_output_fingerprint(root);
+    let initial_output_fingerprint = direct_codex_output_fingerprint_checked(root)
+        .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
     let mut completion_error = direct_game_output_completion_error(root);
     let mut evidence_attempts = 0_usize;
     let mut evidence: Option<BrowserValidationResult> = None;
@@ -4937,7 +4953,8 @@ async fn run_direct_game_creator_turn_with_private_editor_credentials(
     emit_direct_game_creator_progress(root, "codex.review", "正在根据试玩证据自主检查游戏");
     let mut reply =
         direct_game_creator_codex_chat_at(root, system_prompt.clone(), repair_prompt).await?;
-    let repaired_fingerprint = direct_codex_output_fingerprint(root);
+    let repaired_fingerprint = direct_codex_output_fingerprint_checked(root)
+        .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
     completion_error = direct_game_output_completion_error(root);
     if completion_error.is_none()
         && (browser_checked_output_fingerprint.as_deref() != Some(repaired_fingerprint.as_str())
@@ -4968,7 +4985,8 @@ async fn run_direct_game_creator_turn_with_private_editor_credentials(
             "试玩未通过，正在进行最后一次自主修复",
         );
         reply = direct_game_creator_codex_chat_at(root, system_prompt, repair_prompt).await?;
-        let final_fingerprint = direct_codex_output_fingerprint(root);
+        let final_fingerprint = direct_codex_output_fingerprint_checked(root)
+            .map_err(|error| TurnError::turn_failed(FailureStage::CodeGeneration, error))?;
         completion_error = direct_game_output_completion_error(root);
         if completion_error.is_none()
             && browser_checked_output_fingerprint.as_deref() != Some(final_fingerprint.as_str())
diff --git a/docs/project-memory/plans/【里程碑】AGC错误具体文本展示-2026-10-04.md b/docs/project-memory/plans/【里程碑】AGC错误具体文本展示-2026-10-04.md
index 85c1ea487..6c56aaaeb 100644
--- a/docs/project-memory/plans/【里程碑】AGC错误具体文本展示-2026-10-04.md
+++ b/docs/project-memory/plans/【里程碑】AGC错误具体文本展示-2026-10-04.md
@@ -81,5 +81,6 @@ DirectProject 回合失败在确认不是客户端内部不可归类故障时，
 - 策划 Agent 的 Tauri 事件订阅失败原先只放行回合等待、没有任何用户提示；现把订阅 IPC 正文写入项目聊天错误出口，避免只收到不完整的最终态。
 - 专业 Agent 历史回读与项目清单同步的后台 Promise 失败原先只返回 `failed` 或静默结束；现把具体读取/同步正文写入项目聊天错误出口。
 - Direct 交付计划/合同 JSON 解析、策划工作区目录枚举与文本搜索还有 `map_err(|_|)` / `Err(_)` 丢细节；现保留 serde、目录和文件读取正文，安全路径边界仍单独拒绝。
+- 直连 Codex 输出指纹此前把除 `NotFound` 之外的所有读取错误都当成“文件不存在”，可能误判产物未变化；现只对确实不存在的文件保留空位，其余磁盘/权限错误沿回合失败正文上送。
 - 错误报告对话框读取最新错误事件或诊断日志失败时原先只显示“暂不可用/使用快照”；现把读取 IPC/文件正文附在状态提示中，快照回退行为保持不变。
 - WorkspaceLauncher 的清单版本读取、失效事件重读和事件订阅失败原先只写日志或静默回退；现把安全正文送入启动器状态提示，仍保留已有回退刷新路径。