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Date: Fri, 2 Oct 2026 14:58:37 +0800
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- to_user_msg 对 ImportFailed/ImportPartial 先报成功/失败计数，再附有界 JSON 明细

- 新增 IMPORT_REPORT_MESSAGE_MAX_CHARS=4000 字符上限

- 补 TODO：应由工具选择性返回，或把完整报告重定向到文件/诊断日志
---
 .../agent/tool/import_account_assets/error.rs | 34 +++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/tool/import_account_assets/error.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/tool/import_account_assets/error.rs
index 732829122..64e7a2f3b 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/tool/import_account_assets/error.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/tool/import_account_assets/error.rs
@@ -112,8 +112,12 @@ impl ToolFailure for ImportAccountAssetsError {
             Self::NoImportSource => {
                 "登记素材失败：至少提供一个非空的 assetIds 或 localPaths 数组。".to_string()
             }
-            Self::ImportFailed { report } => format!("登记素材失败：{report}"),
-            Self::ImportPartial { report } => format!("登记素材部分成功：{report}"),
+            Self::ImportFailed { report } => {
+                format!("登记素材失败：{}", import_report_message(report))
+            }
+            Self::ImportPartial { report } => {
+                format!("登记素材部分成功：{}", import_report_message(report))
+            }
         }
     }
 
@@ -124,3 +128,29 @@ impl ToolFailure for ImportAccountAssetsError {
         }
     }
 }
+
+/// 逐项导入结果写进消息时的字符上限。
+///
+/// 完整 `report` 仍留在 typed 错误里（诊断 sidecar 落的是原文），这里只收口给模型/用户
+/// 看的那一句话。
+const IMPORT_REPORT_MESSAGE_MAX_CHARS: usize = 4_000;
+
+/// 把逐项导入结果压成一句话：先报成功/失败计数，再附有界 JSON 明细。
+fn import_report_message(report: &Value) -> String {
+    let imported = report
+        .get("imported")
+        .and_then(Value::as_array)
+        .map_or(0, |items| items.len());
+    let failures = report
+        .get("failures")
+        .and_then(Value::as_array)
+        .map_or(0, |items| items.len());
+    // TODO(工具设计)：这里仍把整份 report 序列化进消息，只是按字符数收口兜底。正确方向是让
+    // 工具自己做选择性返回——消息只带计数 + 可操作的失败项；或允许把完整报告重定向到文件/
+    // 诊断日志，消息里只留引用，避免几十 KB 的逐项结果挤占模型上下文。
+    let detail = crate::agent::redaction::truncate_agent_runtime_text(
+        &report.to_string(),
+        IMPORT_REPORT_MESSAGE_MAX_CHARS,
+    );
+    format!("成功 {imported} 项、失败 {failures} 项：{detail}")
+}