diff --git a/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz b/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz
index 99577e2..ab7609d 100644
Binary files a/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz and b/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz differ
diff --git a/public/app.js b/public/app.js
index 55b7f1e..f02b849 100644
--- a/public/app.js
+++ b/public/app.js
@@ -7432,14 +7432,14 @@
       stateEntries.forEach((entry, index) => {
         const tone = collabStateTone(entry.status);
         const displayTitle = pickCollabAgentTitle(entry, entry.id, index);
-        const fallbackDescription = `子代理任务：${displayTitle}`;
-        const descriptionText = summarizePrompt(entry.taskDescription) || fallbackDescription;
-        const descriptionTitle = cleanCollabAgentText(entry.taskDescription) || fallbackDescription;
+        const descriptionTitle = cleanCollabAgentText(entry.taskDescription);
+        const descriptionText = summarizePrompt(descriptionTitle);
+        const showDescription = !!descriptionText && descriptionText !== displayTitle;
         const item = document.createElement('div');
         item.className = 'collab-agent-item';
         item.title = [
           displayTitle,
-          descriptionTitle,
+          showDescription ? descriptionTitle : '',
           entry.role ? `角色: ${entry.role}` : '',
           entry.agentPath ? `路径: ${entry.agentPath}` : '',
           entry.detail ? `结果: ${entry.detail}` : '',
@@ -7492,11 +7492,13 @@
         }
         item.appendChild(row);
 
-        const description = document.createElement('div');
-        description.className = 'collab-agent-item-description';
-        description.textContent = descriptionText;
-        description.title = descriptionTitle;
-        item.appendChild(description);
+        if (showDescription) {
+          const description = document.createElement('div');
+          description.className = 'collab-agent-item-description';
+          description.textContent = descriptionText;
+          description.title = descriptionTitle;
+          item.appendChild(description);
+        }
 
         const planProgress = normalizePlanProgress(entry.planProgress);
         if (planProgress) {
diff --git a/scripts/regression.js b/scripts/regression.js
index ca1908d..09231cd 100644
--- a/scripts/regression.js
+++ b/scripts/regression.js
@@ -1591,9 +1591,7 @@ function assertFrontendSubagentCardMetadataContract() {
     'Prompt-derived automatic-looking titles should stay raw through collabAgentStateEntries and card rendering'
   );
   const promptDerivedAutoNameDescriptions = findNodesByClass(promptDerivedAutoNameElement, 'collab-agent-item-description');
-  assert(promptDerivedAutoNameDescriptions.length === 1, 'Prompt-derived automatic-looking titles should still render a real task description');
-  assert(promptDerivedAutoNameDescriptions[0].textContent === 'frontend_state_review', 'Prompt-derived real task descriptions should stay raw in the card');
-  assert(promptDerivedAutoNameDescriptions[0].title === 'frontend_state_review', 'Prompt-derived real task descriptions should stay raw in the DOM title');
+  assert(promptDerivedAutoNameDescriptions.length === 0, 'Task descriptions identical to the resolved card title should not render twice');
 
   const firstSpawn = metadataApi.mergeCollabAgentTaskState(
     {},
@@ -1956,14 +1954,12 @@ function assertFrontendSubagentCardMetadataContract() {
   assert(!noPromptActivityMerge.input.agentsStates[noPromptThreadId].taskDescription, 'Raw subAgentActivity without prompt should not fabricate taskDescription');
   const noPromptElement = collabApi.renderCollabAgentToolElement(noPromptActivityMerge);
   const noPromptDescriptions = findNodesByClass(noPromptElement, 'collab-agent-item-description');
-  assert(noPromptDescriptions.length === 1, 'Raw subAgentActivity without prompt should still render one visible fallback description');
-  assert(noPromptDescriptions[0].textContent === '子代理任务：计划审查', 'Missing child-agent prompts should render an explicit fallback task description');
-  assert(noPromptDescriptions[0].title === '子代理任务：计划审查', 'Missing child-agent prompts should use the fallback task description as the DOM title');
+  assert(noPromptDescriptions.length === 0, 'Raw subAgentActivity without prompt should not repeat the card title as a fallback description');
   const noPromptItems = findNodesByClass(noPromptElement, 'collab-agent-item');
   assert(noPromptItems.length === 1, 'Raw subAgentActivity without prompt should still render one rich child-agent card');
   assert(
-    String(noPromptItems[0].title || '').includes('子代理任务：计划审查'),
-    'Missing child-agent prompts should include the fallback description in the card DOM title'
+    !String(noPromptItems[0].title || '').includes('子代理任务：'),
+    'Missing child-agent prompts should not add a duplicate fallback description to the card tooltip'
   );
 
   const renderCandidates = collabApi.renderToolCallsForMessage([