diff --git a/lib/ai/zcode-agent/task.ts b/lib/ai/zcode-agent/task.ts
index 2f7af1276..c79c563c6 100644
--- a/lib/ai/zcode-agent/task.ts
+++ b/lib/ai/zcode-agent/task.ts
@@ -192,6 +192,13 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
       // actual outputs below instead of failing a task because an earlier read timed out.
       if (snapshot.calls.some(call => (call.status === "failed" && !call.rejected && !ports.tools[call.name]?.readOnly) || call.uncertain))
         return await save("部分工具结果待确认，已保留执行记录，请核对后继续。", "needs_review");
+      const unresolvedRead = snapshot.calls.some((call, index) => call.status === "failed" && !call.rejected &&
+        !snapshot.calls.slice(index + 1).some(later => later.name === call.name && later.status === "succeeded" &&
+          JSON.stringify(later.input) === JSON.stringify(call.input)));
+      // Without a real result to independently inspect, a viewport/UI action
+      // cannot turn a failed analysis into a completed task.
+      if (unresolvedRead && !snapshot.resultNodeIds.length)
+        return await save("图片或资料暂未读取成功，已保留记录，请稍后继续核对。", "needs_review");
       if (question || snapshot.calls.some(call => call.output?.mode === "interactive"))
         return await save(question || "请在已打开的工具面板中完成操作，然后继续任务。", "needs_review");
       const supplements = snapshot.inputs.filter(input => !startedInputs.has(input.id));
@@ -206,10 +213,6 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
       // still use the existing independent checks against actual saved nodes.
       const mutated = snapshot.calls.some(call => !call.rejected && !ports.tools[call.name]?.readOnly);
       if (!mutated && !snapshot.requirements?.expectedImageCount) {
-        const unresolvedRead = snapshot.calls.some((call, index) => call.status === "failed" && !call.rejected &&
-          !snapshot.calls.slice(index + 1).some(later => later.name === call.name && later.status === "succeeded" &&
-            JSON.stringify(later.input) === JSON.stringify(call.input)));
-        if (unresolvedRead) return await save("图片或资料暂未读取成功，已保留记录，请稍后继续核对。", "needs_review");
         const expectsChange = /生成|抠图|去背景|换背景|删除|移除|替换|改名|移动|放大|裁剪|旋转|导出|下载|制作|添加|上传/.test(snapshot.objective)
           && !/只(?:要|需)?(?:分析|讨论|建议|提示词)|不要(?:执行|生成|修改)/.test(snapshot.objective);
         return await save(expectsChange ? "尚未执行画布操作，请核对任务计划后继续。" : result.response || "已完成画布分析。", expectsChange ? "needs_review" : "completed");
diff --git a/scripts/zcode-agent/task-fixture.ts b/scripts/zcode-agent/task-fixture.ts
index 54f90ed0a..b34e6d851 100644
--- a/scripts/zcode-agent/task-fixture.ts
+++ b/scripts/zcode-agent/task-fixture.ts
@@ -153,10 +153,22 @@ let checks = 0;
  h.ports.native = async options => {
   await options.execute('planCanvasTask', {}, 'plan', options.signal!);
   await options.execute('edit', { nodeIds: ['a'] }, 'edit', options.signal!);
+  h.snapshot.resultNodeIds = ['real-result'];
   await assert.rejects(options.execute('readCanvas', {}, 'failed-read', options.signal!)); return result;
  };
  assert.equal(await runZcodeCanvasTask(h.ports), 'needs_review'); assert.match(h.snapshot.message, /实际结果不符合要求/); checks++;
 }
+{
+ const h = fixture('分析画布'); let reviews = 0;
+ h.ports.tools.readCanvas.execute = async () => { throw new Error('read timeout'); };
+ h.ports.verify = async () => { reviews++; return { passed: true, issues: [] }; };
+ h.ports.native = async options => {
+  await options.execute('planCanvasTask', {}, 'plan', options.signal!);
+  await assert.rejects(options.execute('readCanvas', {}, 'failed-read', options.signal!));
+  await options.execute('edit', { nodeIds: ['a'] }, 'only-ui-action', options.signal!); return result;
+ };
+ assert.equal(await runZcodeCanvasTask(h.ports), 'needs_review'); assert.equal(reviews, 0); checks++;
+}
 {
  const h = fixture();
  h.ports.tools.edit.execute = async () => { throw new Error('paid request outcome unknown'); };