diff --git a/docs/MDTODO/web-observe-runtime-reliability.md b/docs/MDTODO/web-observe-runtime-reliability.md
index 095c1bad..e0154289 100644
--- a/docs/MDTODO/web-observe-runtime-reliability.md
+++ b/docs/MDTODO/web-observe-runtime-reliability.md
@@ -52,3 +52,7 @@
 ## R3 [completed]
 
 修复 [UniDesk #2370](https://github.com/pikasTech/unidesk/issues/2370)：WebProbe 已解析凭据但 Chromium 在首次导航前关闭且无 API 响应时，分类为浏览器运行时 blocker，并在单次有界输出披露 credential/request/API 分层事实，避免重复检查 Secret 与远端 artifact；不降低既有门禁、不阻塞业务交付，完成任务后将详细报告写入[任务报告](./details/web-observe-runtime-reliability/R3_Task_Report.md)。
+
+## R4 [in_progress]
+
+改进 [UniDesk #2425](https://github.com/pikasTech/unidesk/issues/2425) 的 `web-probe screenshot` custom/local 可见性：scoped help 明确 `--url` 与 `--path` 互斥，校验失败返回 typed reason、`mutation=false` 和可直接执行的修正示例，同步 webdev skill；只改帮助/错误与文档，不改浏览器能力、资源门禁、CI/CD 或运行面，完成任务后将详细报告写入[任务报告](./details/web-observe-runtime-reliability/R4_Task_Report.md)。