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 be81367bf..659caf036 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
@@ -2162,7 +2162,8 @@ fn direct_codex_error_feedback_prompt(error: &str, attempt: usize) -> String {
 /// （[`DirectTurnError::is_reportable`]，宿主 / 环境事实）。
 ///
 /// 返回给用户看的那行 `direct-codex-failure:v2 ...` 文本：它是这一轮（或这次拒绝）的收口说明，
-/// 事件载荷、横幅与项目历史共用同一份，命令边界也只序列化它一次。
+/// 事件载荷与横幅共用同一份，命令边界也只序列化它一次。诊断文件的引用**不进**这份文案：
+/// 界面不再展开详情，线索只留在宿主侧（`.agent/runtime/errors`、应用日志与错误上报池）。
 pub(crate) fn record_direct_codex_failure(
     root: &Path,
     failure: &DirectTurnError,
@@ -2211,7 +2212,8 @@ pub(crate) fn record_direct_codex_failure(
     };
     // 诊断 code 仍走共享的 runtime_error 分类（它是跨链路的持久化标签，不是流程判据）。
     let error_code = classify_direct_codex_error(&detail);
-    let unified_detail_ref = persist_agent_runtime_error(
+    // sidecar 照写，但引用不进用户可见文案。
+    let _ = persist_agent_runtime_error(
         root,
         client_turn_id,
         "direct-codex",
@@ -2226,10 +2228,9 @@ pub(crate) fn record_direct_codex_failure(
             "legacyDiagnosticWritten": diagnostic_written,
         }),
     )
-    .ok()
-    .map(|event| event.detail_ref);
-    format!(
-        "direct-codex-failure:v2 stage={} code={} retryable={} summary={}；建议：{}；{}{}",
+    .ok();
+    let public_text = format!(
+        "direct-codex-failure:v2 stage={} code={} retryable={} summary={}；建议：{}；{}",
         stage.id(),
         error_code,
         retryable,
@@ -2238,18 +2239,19 @@ pub(crate) fn record_direct_codex_failure(
             .unwrap_or("未提供可安全展示的详细原因"),
         recovery_hint,
         diagnostics_suffix,
-        unified_detail_ref
-            .map(|path| format!("；详情：{path}"))
-            .unwrap_or_default(),
-    )
+    );
+    // 失败也进错误上报池：命令接单化之后前端 catch 只剩"接单被拒"，池不能只靠前端填。
+    // 两条通道同时上报也不会变成两条——池按 fingerprint 合并同一份文案。
+    let _ = crate::error_report::report_agent_runtime_error("direct-codex", &public_text);
+    public_text
 }
 
-/// 命令边界的错误文本：可留痕的调用级拒绝在这里补一份运行错误诊断（返回串因此带 `详情：` 引用），
+/// 命令边界的错误文本：可留痕的调用级拒绝在这里补一份运行错误诊断（文案里不带诊断引用），
 /// 其余只输出 [`DirectTurnError`] 的 `Display`。
 ///
 /// 分层改成 typed 之前，这几条"宿主 / 环境事实"是在回合失败通道里被写进诊断的；分层之后它们不再
-/// 进那条通道，留痕与界面的 `详情：` 展开都在这里补回来。GUI 命令与 CLI 边界共用这一份，禁止在各自
-/// 边界再写一套判据；回合级失败已在上游写过诊断，这里直接放行。
+/// 进那条通道，留痕在这里补回来。GUI 命令与 CLI 边界共用这一份，禁止在各自边界再写一套判据；
+/// 回合级失败已在上游写过诊断，这里直接放行。
 pub(crate) fn direct_turn_error_boundary_text(
     root: &Path,
     client_turn_id: Option<&str>,
@@ -2261,19 +2263,6 @@ pub(crate) fn direct_turn_error_boundary_text(
     record_direct_codex_failure(root, &failure, client_turn_id)
 }
 
-fn persist_direct_codex_failure_context(
-    root: &Path,
-    client_turn_id: &str,
-    error: &str,
-) -> Result<(), String> {
-    let item = direct_project_local_message_item(
-        "assistant",
-        error,
-        Some(&format!("direct-codex:{client_turn_id}:failure")),
-    )?;
-    append_direct_project_history_item_at(root, &item)
-}
-
 fn direct_taonier_art_generation_runtime_context(
     root: &Path,
     output_path: &str,
@@ -4649,12 +4638,9 @@ async fn run_direct_game_creator_turn_at_with_creation_type_and_emitter(
                 &failure,
                 turn_emitter.map(|emitter| emitter.turn_id()),
             );
-            if let Some(emitter) = turn_emitter {
-                // Persist the safe terminal projection so the next DirectProject
-                // turn can answer a diagnostic question from evidence instead of
-                // guessing or starting another playtest.
-                let _ = persist_direct_codex_failure_context(root, emitter.turn_id(), &error);
-            }
+            // TODO(Direct 命令接单化)：失败说明本轮不写进项目历史——重进项目只会看到那条没有回复的
+            // 用户消息，原因只在当轮界面与宿主诊断里。以后要给"进历史但不喂模型"的条目留一条通道
+            // （见 `docs/adr/【ADR】DirectProject命令接单化-2026-09-23.md` 的备选方案第 3 条）。
             if let Some(emitter) = turn_emitter {
                 // 失败说明也是这一回合的内容：按出现顺序追加到回合流末尾，
                 // 这样"流里已经是完整内容"这一点对失败回合同样成立。
@@ -7936,8 +7922,8 @@ mod tests {
         );
     }
 
-    /// 可留痕的调用级拒绝（宿主 / 环境事实）在命令边界补一份运行错误诊断，返回串带 `详情：` 引用：
-    /// 这是分层改 typed 之前的行为，前端横幅的展开逻辑按这个引用工作。
+    /// 可留痕的调用级拒绝（宿主 / 环境事实）在命令边界补一份运行错误诊断，但返回串不再带引用：
+    /// 界面不展开详情，线索只留在 `.agent/runtime/errors`、应用日志与错误上报池。
     #[test]
     fn reportable_call_rejection_writes_a_diagnostic_at_the_boundary() {
         let parent = tempfile::tempdir().expect("temp dir");
@@ -7952,7 +7938,8 @@ mod tests {
             },
         );
 
-        assert!(text.contains("详情：.agent/runtime/errors/"), "{text}");
+        assert!(text.contains("direct-codex-failure:v2"), "{text}");
+        assert!(!text.contains("详情："), "{text}");
         let entries = std::fs::read_dir(root.join(".agent/runtime/errors"))
             .expect("runtime error directory")
             .filter_map(Result::ok)
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs
index 65c44bb2a..98fcec77c 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/user_input.rs
@@ -31,8 +31,8 @@ pub(crate) fn normalize_direct_client_turn_id(
 /// DirectProject 聊天命令：对外仍然是 `Result<String, String>`。
 ///
 /// 字符串只在这里生成一次；前端拿到的仍是"一句给用户看的话"，而 Rust 侧从命令入口到宿主出口全程
-/// 只传 typed 错误。可留痕的调用级拒绝（宿主 / 环境事实）在这里补一份运行错误诊断，返回串因此带上
-/// `详情：` 引用——界面横幅的展开逻辑按这个引用工作。
+/// 只传 typed 错误。可留痕的调用级拒绝（宿主 / 环境事实）在这里补一份运行错误诊断，但返回串不再
+/// 带诊断引用——界面不展开详情，线索只在宿主侧。
 ///
 // TODO(Direct 命令接单化，未实施)：现在这个命令 await 整轮，于是"命令边界"承担了不属于它的角色——
 // 回合失败的文案要靠这条 Err 回到界面，认证失败重试也只能挂在它上面。目标形状（草案见
diff --git a/apps/ai-game-creator-shell/src-tauri/src/commands.rs b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
index b5c09bb9d..896eb1773 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/commands.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
@@ -5873,38 +5873,6 @@ pub(crate) async fn read_direct_project_conversation(
     .map_err(|error| format!("读取 DirectProject 历史后台任务失败：{error}"))?
 }
 
-#[tauri::command]
-pub(crate) async fn read_agent_runtime_error_detail(
-    project_path: String,
-    detail_ref: String,
-) -> Result<String, String> {
-    tauri::async_runtime::spawn_blocking(move || {
-        let root = Path::new(project_path.trim());
-        enforce_project_permission_policy(root, "conversation.read")?;
-        let relative = detail_ref.trim();
-        let Some(file_name) = relative.strip_prefix(".agent/runtime/errors/") else {
-            return Err("错误诊断引用不在项目错误目录内".to_string());
-        };
-        if file_name.is_empty()
-            || file_name.contains(['/', '\\'])
-            || file_name.contains("..")
-            || !file_name.ends_with(".json")
-        {
-            return Err("错误诊断引用格式无效".to_string());
-        }
-        let path = root.join(relative);
-        prepare_game_creator_private_path_for_read(&path, false, "统一错误诊断")?;
-        let bytes = std::fs::read(&path).map_err(|error| format!("读取错误诊断失败：{error}"))?;
-        if bytes.len() > 16 * 1024 {
-            return Err("错误诊断超过读取上限".to_string());
-        }
-        let text = String::from_utf8(bytes).map_err(|_| "错误诊断不是 UTF-8 文本".to_string())?;
-        Ok(redact_agent_runtime_error(root, &text, 16 * 1024))
-    })
-    .await
-    .map_err(|error| format!("读取统一错误诊断后台任务失败：{error}"))?
-}
-
 #[tauri::command]
 pub(crate) fn list_game_creator_direct_active_turns(
 ) -> Result<Vec<DirectActiveTurnSnapshot>, String> {
diff --git a/apps/ai-game-creator-shell/src-tauri/src/main.rs b/apps/ai-game-creator-shell/src-tauri/src/main.rs
index 9d5f1ae18..166b53646 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/main.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/main.rs
@@ -2761,7 +2761,6 @@ fn main() {
             archive_game_creator_agent_session,
             read_local_conversation,
             read_direct_project_conversation,
-            read_agent_runtime_error_detail,
             list_game_creator_direct_active_turns,
             subscribe_direct_project_thread,
             consume_direct_project_thread,
diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/controller/useDirectProjectChatController.ts b/apps/ai-game-creator-shell/src/view/project-development/chat/controller/useDirectProjectChatController.ts
index dfcf38435..2fb54cb81 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/controller/useDirectProjectChatController.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/controller/useDirectProjectChatController.ts
@@ -610,22 +610,10 @@ export function useDirectProjectChatController({
       }
       void captureAgentRuntimeError(error, DIRECT_CODEX_AGENT_ID);
       const message = error instanceof Error ? error.message : String(error);
-      let persistedDetail = '';
-      const detailRef = message.match(
-        /详情：(\.agent\/runtime\/errors\/[^\s；]+)/,
-      )?.[1];
-      if (detailRef) {
-        try {
-          persistedDetail = await invoke<string>(
-            'read_agent_runtime_error_detail',
-            { projectPath: nextProjectPath, detailRef },
-          );
-        } catch {
-          persistedDetail = '';
-        }
-      }
+      // 不再展开诊断详情：文案里没有引用，前端也不去读那份文件。线索留在
+      // `.agent/runtime/errors`、应用日志与错误上报池里，界面只显示这一句话。
       const visibleMessage = projectRuntimeVisibleError(
-        persistedDetail ? `${message}\n\n${persistedDetail}` : message,
+        message,
         '陶泥儿智能创作',
         true,
       );