diff --git a/apps/ai-game-creator-shell/scripts/start-dev-server.mjs b/apps/ai-game-creator-shell/scripts/start-dev-server.mjs
index 9a4914dcb..f1f76ff31 100644
--- a/apps/ai-game-creator-shell/scripts/start-dev-server.mjs
+++ b/apps/ai-game-creator-shell/scripts/start-dev-server.mjs
@@ -92,6 +92,8 @@ const child = spawn(
   {
     cwd: appRoot,
     stdio: 'inherit',
+    // Node 18.20+/20+/24 on Windows rejects spawning .cmd (npm.cmd) without a shell (EINVAL).
+    shell: true,
   },
 );
 
diff --git a/server-rs/crates/platform-llm/src/lib.rs b/server-rs/crates/platform-llm/src/lib.rs
index 0744e522a..fa7fde1bd 100644
--- a/server-rs/crates/platform-llm/src/lib.rs
+++ b/server-rs/crates/platform-llm/src/lib.rs
@@ -1838,10 +1838,9 @@ fn parse_anthropic_sse_event(data: &str) -> Result<Option<ParsedStreamEvent>, Ll
                 .and_then(serde_json::Value::as_str)
                 .map(str::to_string),
         })),
-        "message_stop" => Ok(Some(ParsedStreamEvent {
-            delta_text: None,
-            finish_reason: Some("stop".to_string()),
-        })),
+        // message_stop 只是流终止信号；真正的 stop_reason 已由 message_delta 提供，
+        // 这里不要伪造 finish_reason，否则会覆盖掉 end_turn 等真实值。
+        "message_stop" => Ok(None),
         "error" => {
             let message = parsed
                 .get("error")
@@ -2640,7 +2639,8 @@ mod tests {
             body: concat!(
                 "data: {\"type\":\"content_block_delta\",\"delta\":{\"type\":\"text_delta\",\"text\":\"你\"}}\n\n",
                 "data: {\"type\":\"content_block_delta\",\"delta\":{\"type\":\"text_delta\",\"text\":\"好\"}}\n\n",
-                "data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"}}\n\n"
+                "data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"}}\n\n",
+                "data: {\"type\":\"message_stop\"}\n\n"
             )
             .to_string(),
             extra_headers: vec![("x-request-id", "req_anthropic_stream_01")],