diff --git a/crates/df-ai/src/anthropic_compat.rs b/crates/df-ai/src/anthropic_compat.rs
index c4da0c1..57bb38a 100644
--- a/crates/df-ai/src/anthropic_compat.rs
+++ b/crates/df-ai/src/anthropic_compat.rs
@@ -787,9 +787,13 @@ mod tests {
         let mut acc: Option<TokenUsage> = None;
 
         // 1) message_start：input=42，output=0
+        // （6bafdcd 起 usage 同帧挂载：message_start 即带初始快照，中途断连也能拿到真实 usage）
         let c = apply_anthropic_event(&message_start(42), &mut acc);
         assert!(!c.finished);
-        assert!(c.usage.is_none());
+        let u0 = c.usage.expect("message_start 应同帧带出初始 usage 快照");
+        assert_eq!(u0.prompt_tokens, 42);
+        assert_eq!(u0.completion_tokens, 0);
+        assert_eq!(u0.total_tokens, 42);
         let a = acc.as_ref().expect("message_start 应初始化累加器");
         assert_eq!(a.prompt_tokens, 42);
         assert_eq!(a.completion_tokens, 0);
diff --git a/crates/df-ai/src/openai_compat.rs b/crates/df-ai/src/openai_compat.rs
index 63e74e2..1dab082 100644
--- a/crates/df-ai/src/openai_compat.rs
+++ b/crates/df-ai/src/openai_compat.rs
@@ -696,10 +696,14 @@ mod tests {
         assert_eq!(c.delta, "");
         assert!(acc.is_none(), "此 chunk 无 usage 字段，累加器仍为 None");
 
-        // 4) usage-only chunk（choices=[]）携带累计 usage → 覆盖累加器
+        // 4) usage-only chunk（choices=[]）携带累计 usage → 覆盖累加器，并同帧带出快照
+        // （6bafdcd 起 usage 与累加器同帧挂载，中途断连也能拿到真实 usage，非仅 [DONE] 带出）
         let c = apply_openai_sse(&usage_only_chunk(12, 34), &mut acc);
         assert!(!c.finished);
-        assert!(c.usage.is_none(), "非 [DONE] chunk 不带出 usage");
+        let u = c.usage.expect("usage-only chunk 应同帧带出累积 usage 快照");
+        assert_eq!(u.prompt_tokens, 12);
+        assert_eq!(u.completion_tokens, 34);
+        assert_eq!(u.total_tokens, 46);
         let acc = acc.expect("累加器应已被 usage-only chunk 覆盖写入");
         assert_eq!(acc.prompt_tokens, 12);
         assert_eq!(acc.completion_tokens, 34);
@@ -712,7 +716,11 @@ mod tests {
         let mut acc: Option<TokenUsage> = None;
         let c = apply_openai_sse(&text_chunk_with_usage("", "stop", 100, 200), &mut acc);
         assert!(c.finished);
-        assert!(c.usage.is_none(), "非 [DONE] 不带出 usage，仅覆盖累加器");
+        // 6bafdcd 起 usage 与累加器同帧挂载：finish 帧即带快照，下游不必等 [DONE]
+        let u = c.usage.expect("finish 帧应同帧带出累积 usage 快照");
+        assert_eq!(u.prompt_tokens, 100);
+        assert_eq!(u.completion_tokens, 200);
+        assert_eq!(u.total_tokens, 300);
         let acc = acc.expect("末段 chunk 的 usage 应已覆盖累加器");
         assert_eq!(acc.prompt_tokens, 100);
         assert_eq!(acc.completion_tokens, 200);
diff --git a/src-tauri/build.rs b/src-tauri/build.rs
index 1caf966..2f2dac1 100644
--- a/src-tauri/build.rs
+++ b/src-tauri/build.rs
@@ -17,4 +17,13 @@ fn main() {
             println!("cargo:rustc-env=MCP_APP_IDENTIFIER={}", identifier);
         }
     }
+
+    // 测试二进制(lib test)没有 tauri 给 bin 内嵌的窗口清单,而 GUI 依赖(tao/muda/tray_icon)
+    // 会静态导入 comctl32 的 TaskDialogIndirect 等导出(仅存在于 SxS v6 程序集),无清单时
+    // 加载器绑定 System32 的 5.82 版(缺这些导出),进程启动即 STATUS_ENTRYPOINT_NOT_FOUND,
+    // cargo test 全部无法运行。用延迟加载把 comctl32 绑定推迟到首次调用,测试进程从不触碰
+    // GUI 入口即永不解析;app 端 bin 自带清单选到 v6,行为不变。不用 /MANIFEST:EMBED 方案是
+    // 因为它会与 tauri 内嵌的资源清单产生重复 RT_MANIFEST,链接失败。
+    println!("cargo:rustc-link-arg=/DELAYLOAD:comctl32.dll");
+    println!("cargo:rustc-link-lib=delayimp");
 }