diff --git a/frontend-web/src/roundtable-planning/components/MessageStepsCard.tsx b/frontend-web/src/roundtable-planning/components/MessageStepsCard.tsx
index 03ad67a4..87f14416 100644
--- a/frontend-web/src/roundtable-planning/components/MessageStepsCard.tsx
+++ b/frontend-web/src/roundtable-planning/components/MessageStepsCard.tsx
@@ -170,10 +170,13 @@ function ToolStep({
   const display = getStepDisplay(step.key, step.label, step.args);
   const argNode = renderStepArgs(step.key, step.args, resolveAgentName);
   const [, toolName] = step.key.split(":");
+  // read_file 也可点 —— 验证类「查看文件…」步骤常出现在最后一条,点击后在沙箱里
+  // 查看该文件内容(走虚拟预览或 outputs HTTP)。主聊天只让 write 类可点,这里增强。
   const isArtifactStep =
     toolName === "write_file" ||
     toolName === "str_replace" ||
-    toolName === "present_files";
+    toolName === "present_files" ||
+    toolName === "read_file";
 
   return (
     <ChainOfThoughtStep
diff --git a/frontend-web/src/roundtable-planning/hooks/useStep2Orchestration.ts b/frontend-web/src/roundtable-planning/hooks/useStep2Orchestration.ts
index 7e4f7250..0a20610d 100644
--- a/frontend-web/src/roundtable-planning/hooks/useStep2Orchestration.ts
+++ b/frontend-web/src/roundtable-planning/hooks/useStep2Orchestration.ts
@@ -557,6 +557,16 @@ export function useStep2Orchestration(
         openSeatVirtualArtifact(seatThreadId, virtualUrl, false);
         return;
       }
+      if (toolName === "read_file") {
+        // 验证类「查看文件…」步骤:用 args.path 在沙箱预览该文件。
+        // openArtifactPreview 内部 findSeatArtifactSource 优先按 path 命中流式期间
+        // write_file 缓存的内容(虚拟预览);未命中再走 seat thread 的 outputs HTTP。
+        const path = step.args?.path;
+        if (typeof path === "string" && path) {
+          openArtifactPreview(seatThreadId, path);
+        }
+        return;
+      }
       if (toolName === "present_files") {
         const filepaths = step.args?.filepaths;
         if (Array.isArray(filepaths)) {