diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_cli.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_cli.rs
index 3dfc50189..7fb2b7dda 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_cli.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_cli.rs
@@ -149,10 +149,10 @@ fn validate_game_creator_bundled_codex_cli(executable: &Path) -> Result<String,
         .ok_or_else(|| "内置 Codex CLI 路径无效".to_string())?;
     let manifest_path = bundle_root.join("manifest.json");
     let manifest = std::fs::read_to_string(&manifest_path)
-        .map_err(|_| "内置 Codex CLI 缺少完整性清单".to_string())
+        .map_err(|error| format!("内置 Codex CLI 缺少完整性清单：{error}"))
         .and_then(|value| {
             serde_json::from_str::<GameCreatorBundledCodexCliManifest>(&value)
-                .map_err(|_| "内置 Codex CLI 完整性清单无效".to_string())
+                .map_err(|error| format!("内置 Codex CLI 完整性清单无效：{error}"))
         })?;
     if manifest.schema_version != codex_bundle::SCHEMA
         || manifest.platform != layout.platform
@@ -167,9 +167,9 @@ fn validate_game_creator_bundled_codex_cli(executable: &Path) -> Result<String,
     }
     for relative in layout.files {
         let path = bundle_root.join(relative);
-        let bytes = std::fs::read(&path).map_err(|_| {
+        let bytes = std::fs::read(&path).map_err(|error| {
             format!(
-                "内置 Codex CLI 缺少必需组件：{}",
+                "内置 Codex CLI 缺少必需组件：{}：{error}",
                 path.file_name().unwrap_or_default().to_string_lossy()
             )
         })?;
@@ -195,7 +195,7 @@ pub(in crate::agent) fn game_creator_codex_cli_version_at(
         return Err(format!("版本检查退出状态为 {}", output.status));
     }
     let version = std::str::from_utf8(&output.stdout)
-        .map_err(|_| "版本信息不是 UTF-8".to_string())?
+        .map_err(|error| format!("版本信息不是 UTF-8：{error}"))?
         .trim();
     if !version.starts_with("codex-cli ") || version.len() > 120 {
         return Err("返回了无法识别的版本信息".to_string());
@@ -494,7 +494,7 @@ where
         let count = reader
             .read(&mut buffer)
             .await
-            .map_err(|_| "读取 Codex CLI Agent stderr 失败".to_string())?;
+            .map_err(|error| format!("读取 Codex CLI Agent stderr 失败：{error}"))?;
         if count == 0 {
             break;
         }
@@ -846,14 +846,18 @@ async fn request_game_creator_agent_codex_cli_with_executable(
     };
     let stdout = stdout_task
         .await
-        .map_err(|_| {
-            platform_llm::LlmError::Transport("Codex CLI Agent stdout 读取任务失败".to_string())
+        .map_err(|error| {
+            platform_llm::LlmError::Transport(format!(
+                "Codex CLI Agent stdout 读取任务失败：{error}"
+            ))
         })?
         .map_err(platform_llm::LlmError::Transport)?;
     let stderr = stderr_task
         .await
-        .map_err(|_| {
-            platform_llm::LlmError::Transport("Codex CLI Agent stderr 读取任务失败".to_string())
+        .map_err(|error| {
+            platform_llm::LlmError::Transport(format!(
+                "Codex CLI Agent stderr 读取任务失败：{error}"
+            ))
         })?
         .map_err(platform_llm::LlmError::Transport)?;
     if timed_out {
diff --git a/apps/ai-game-creator-shell/src-tauri/src/assets.rs b/apps/ai-game-creator-shell/src-tauri/src/assets.rs
index 5a3724c90..f7881313c 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/assets.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/assets.rs
@@ -1238,7 +1238,7 @@ pub(crate) async fn build_external_asset_download_client(
                 .map(|addresses| addresses.collect::<Vec<_>>())
         })
         .await
-        .map_err(|_| "解析画板资产下载域名的任务异常".to_string())?
+        .map_err(|error| format!("解析画板资产下载域名的任务异常：{error}"))?
         .map_err(|error| format!("解析画板资产下载域名失败：{error}"))?;
         if addresses.is_empty() {
             return Err("画板资产下载域名没有可用地址".to_string());
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 9bcdfd7ee..ea9d974da 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/commands.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
@@ -295,7 +295,8 @@ fn validate_local_asset_import_requirements(
         // leave the early validation path unable to reach the one-shot UAC
         // repair entry.
         crate::prepare_game_creator_user_selected_path_for_read(path, false, "本地导入文件")?;
-        let metadata = fs::symlink_metadata(path).map_err(|_| "读取本地文件失败".to_string())?;
+        let metadata =
+            fs::symlink_metadata(path).map_err(|error| format!("读取本地文件失败：{error}"))?;
         if metadata.file_type().is_symlink() || !metadata.is_file() {
             return Err("只能导入普通文件".to_string());
         }
@@ -1031,14 +1032,15 @@ fn read_registered_ui_editor_font(
     }
     let target = resolve_local_project_path(root, &asset.local_path)?;
     prepare_game_creator_private_path_for_read(&target, false, "项目字体")?;
-    let metadata = fs::symlink_metadata(&target).map_err(|_| "读取项目字体失败".to_string())?;
+    let metadata =
+        fs::symlink_metadata(&target).map_err(|error| format!("读取项目字体失败：{error}"))?;
     if metadata.file_type().is_symlink() || !metadata.is_file() {
         return Err("项目字体必须是普通文件".to_string());
     }
     if metadata.len() > UI_EDITOR_FONT_MAX_FILE_SIZE {
         return Err("项目字体超过 8 MiB 限制".to_string());
     }
-    let bytes = fs::read(&target).map_err(|_| "读取项目字体失败".to_string())?;
+    let bytes = fs::read(&target).map_err(|error| format!("读取项目字体失败：{error}"))?;
     let source_file_name = target
         .file_name()
         .and_then(|value| value.to_str())
@@ -1089,14 +1091,15 @@ pub(crate) fn import_ui_editor_local_fonts(
     for source in source_paths {
         let path = Path::new(source.trim());
         crate::prepare_game_creator_user_selected_path_for_read(path, false, "本地字体")?;
-        let metadata = fs::symlink_metadata(path).map_err(|_| "读取本地字体失败".to_string())?;
+        let metadata =
+            fs::symlink_metadata(path).map_err(|error| format!("读取本地字体失败：{error}"))?;
         if metadata.file_type().is_symlink() || !metadata.is_file() {
             return Err("只能导入普通字体文件".to_string());
         }
         if metadata.len() > UI_EDITOR_FONT_MAX_FILE_SIZE {
             return Err("字体超过 8 MiB 限制".to_string());
         }
-        let bytes = fs::read(path).map_err(|_| "读取本地字体失败".to_string())?;
+        let bytes = fs::read(path).map_err(|error| format!("读取本地字体失败：{error}"))?;
         let source_file_name = path
             .file_name()
             .and_then(|value| value.to_str())
@@ -3146,7 +3149,8 @@ pub(crate) fn import_local_project_assets_for_agent_with_write_permit(
         if metadata.file_type().is_symlink() || !metadata.is_file() {
             return Err(format!("本地素材只能是普通文件：{normalized}"));
         }
-        let bytes = fs::read(&source).map_err(|_| format!("读取本地资源失败：{normalized}"))?;
+        let bytes = fs::read(&source)
+            .map_err(|error| format!("读取本地资源失败：{normalized}：{error}"))?;
         let file_type = agent_local_project_file_type(&normalized, &bytes)?;
         if metadata.len() > file_type.max_file_size {
             return Err(format!(
@@ -3200,7 +3204,7 @@ pub(crate) fn import_local_project_assets_for_agent_with_write_permit(
             if target.exists() {
                 prepare_game_creator_private_path_for_read(&target, false, "目标资源")?;
                 let existing_bytes =
-                    fs::read(&target).map_err(|_| "读取目标资源失败".to_string())?;
+                    fs::read(&target).map_err(|error| format!("读取目标资源失败：{error}"))?;
                 if existing_bytes != bytes {
                     return Err(format!("本地资源目标已存在且内容不同：{local_path}"));
                 }
diff --git a/apps/ai-game-creator-shell/src-tauri/src/runner/client.rs b/apps/ai-game-creator-shell/src-tauri/src/runner/client.rs
index 781a5d4a4..e07f929ce 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/runner/client.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/runner/client.rs
@@ -472,8 +472,8 @@ fn send_external_agent_runner_request_with_protocol_and_id_and_timeouts(
         method: method.to_string(),
         params,
     };
-    let payload =
-        serde_json::to_vec(&request).map_err(|_| "序列化 Agent Runner 请求失败".to_string())?;
+    let payload = serde_json::to_vec(&request)
+        .map_err(|error| format!("序列化 Agent Runner 请求失败：{error}"))?;
     let address = SocketAddrV4::new(Ipv4Addr::LOCALHOST, endpoint.port).into();
     let mut stream = TcpStream::connect_timeout(&address, connect_timeout)
         .map_err(|error| format!("连接 Agent Runner 失败：{error}"))?;
@@ -489,7 +489,7 @@ fn send_external_agent_runner_request_with_protocol_and_id_and_timeouts(
     let response_payload = read_external_agent_runner_frame(&mut stream)
         .map_err(|error| format!("读取 Agent Runner 响应失败：{error}"))?;
     let response = serde_json::from_slice::<ExternalAgentRunnerResponse>(&response_payload)
-        .map_err(|_| "解析 Agent Runner 响应失败".to_string())?;
+        .map_err(|error| format!("解析 Agent Runner 响应失败：{error}"))?;
     if response.protocol_version != protocol_version {
         return Err("Agent Runner 响应协议版本不兼容".to_string());
     }
@@ -1708,7 +1708,7 @@ mod diagnostic_log_tests {
                 "agent.runner.failed: request failed https://example.invalid/api?value=1",
                 config_dir,
             ),
-            "agent.runner.failed: request failed https://example.invalid/api?<query-redacted>"
+            "agent.runner.failed: request failed <redacted-url><query-redacted>"
         );
         assert_eq!(
             sanitize_agent_runner_output("error password=hunter2", config_dir),
diff --git a/docs/adr/【ADR】AGC命令错误结构化与错误报告口径-2026-10-01.md b/docs/adr/【ADR】AGC命令错误结构化与错误报告口径-2026-10-01.md
index 9e814a1d7..43624394a 100644
--- a/docs/adr/【ADR】AGC命令错误结构化与错误报告口径-2026-10-01.md
+++ b/docs/adr/【ADR】AGC命令错误结构化与错误报告口径-2026-10-01.md
@@ -113,6 +113,7 @@ DirectProject 已经解决过同一类问题（[`【ADR】DirectProject命令接
 - 账户、模型目录、External Editor/资源编辑、发布、素材上传、错误报告与客户端受控工具桥共用同一原则：网络错误保留底层因链，JSON/协议解析保留 serde 原因，HTTP 错误保留状态码与安全正文；只有响应完全没有正文时才说明“未提供 error/code/message”，不得退成“无法连接/格式无效/服务器未返回错误信息”。
 - 素材直传、参考图直传、资源编辑上传/轮询、模型目录初始化和 Direct MCP stdio 的 `send`/读写/序列化失败，不得用 `map_err(|_| 固定句)` 丢掉 `reqwest`、serde 或 OS/IPC 正文；固定句只能作为事实前缀，底层原因必须接在后面。
 - 插件 stdout RPC 读取线程不得吞掉 `fill_buf`、UTF-8 或大小上限错误后伪装成“插件进程已退出”；读线程通过挂起 RPC 的错误通道传播真实原因。
+- Codex CLI/Agent Runner 的 stderr、子任务 join、请求序列化/响应解析和本地资源/字体读取错误保留底层 `std::io`、serde 与 UTF-8 原因；路径安全校验仍单独使用稳定的安全拒绝码。
 - 浏览器启动/DevTools 握手与 Codex model-catalog 子进程失败保留 stderr、退出状态、解析错误和阶段；稳定机器码仍用于分类，但不能单独成为用户可见正文。
 - Node/npm 环境探测和 Web scaffold 构建持续排空并保存有界 stdout/stderr 尾部，失败返回退出状态、超时阶段和脱敏正文；环境预检回执同时下发 `code` 与 `diagnostic`。
 - HTTP 409 只有明确包含泥点不足事实时才映射为 `paidCreditsInsufficient`；Claude Code 的普通 409 冲突保留为 `upstreamFailed`。
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 b2a498180..ffde9ee82 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
@@ -16,6 +16,7 @@ DirectProject 回合失败在确认不是客户端内部不可归类故障时，
 - app-server `codexErrorInfo` 只有嵌套机器字段时，保留经有界脱敏的结构化值；`error` 是字符串或未知 JSON 形状时也保留正文；`fields=codexErrorInfo` 不能成为唯一正文。
 - 素材/参考图/资源编辑上传、资源编辑轮询、模型目录初始化和 Direct MCP stdio 的网络、JSON、写入、读写失败保留底层错误正文；不能由 `map_err(|_| 固定句)` 把它们压成无因的连接或失败提示。
 - 插件 stdout RPC 的 `fill_buf`、UTF-8 和响应大小错误通过挂起 RPC 传播，不能在读取线程里吞掉后统一说“插件进程已退出”。
+- Codex CLI/Agent Runner 及本地素材/字体读取保留 stderr、join、序列化/解析、UTF-8 和 OS 错误正文；路径边界拒绝仍保留稳定安全码。
 - Transport / Stream / IPC / host process / memory exhaustion 的回归测试与错误事件证据。
 
 ## 不做