diff --git a/apps/web/app/components/agent/agent-conversation.tsx b/apps/web/app/components/agent/agent-conversation.tsx
index 68218be0..2f9d6512 100644
--- a/apps/web/app/components/agent/agent-conversation.tsx
+++ b/apps/web/app/components/agent/agent-conversation.tsx
@@ -196,7 +196,9 @@ function ToolRow({ call, audit }: { call: ToolCallView; audit?: InvocationAudit
   const [open, setOpen] = useState(false);
   const meta = capabilityMeta(call.capabilityId);
   const denied = isDenied(call);
-  const summary = denied ? deniedReason(call).text : toolSummary(call);
+  const raw = denied ? deniedReason(call).text : toolSummary(call);
+  // 旧会话的错误文字里带能力 ID / 原因码:和最终汇报一样换成能力标题与人话
+  const summary = raw ? humanizeReport(raw).text : raw;
   return (
     <li className="min-w-0">
       <button
@@ -319,7 +321,7 @@ export function StepSummary({
                 key={a.key}
                 className="line-clamp-3 px-1 py-1 text-meta break-words whitespace-pre-wrap text-muted-foreground"
               >
-                {a.text.trim()}
+                {humanizeReport(a.text.trim()).text}
               </li>
             ),
           )}
diff --git a/apps/web/app/components/agent/agui3.test.ts b/apps/web/app/components/agent/agui3.test.ts
index df5e6380..18bac1ba 100644
--- a/apps/web/app/components/agent/agui3.test.ts
+++ b/apps/web/app/components/agent/agui3.test.ts
@@ -571,3 +571,24 @@ describe("进度行时长(FIX-9):从这一轮开始算到结论正文", () => {
     expect(t).toMatch(/· 7 秒/);
   });
 });
+
+describe("步骤明细(FIX-9):能力 ID 换成能力标题", () => {
+  it("失败原因与工具之间的话里的能力 ID 走能力标题", () => {
+    const activity: ActivityItem[] = [
+      { kind: "note", key: "n1", text: "site.health_check 被拒，改用 site.list。", at: AT },
+      {
+        kind: "tool",
+        key: "c1",
+        call: call({
+          capabilityId: "download.inspect",
+          status: "failed",
+          outputSummary: '{"error":{"code":"x","message":"site.health_check 调用失败"}}',
+        }),
+      },
+    ];
+    const t = text(render(createElement(StepSummary, { activity, running: false })));
+    expect(t).not.toContain("site.health_check");
+    expect(t).not.toContain("site.list");
+    expect(t).toContain("检测站点 被拒");
+  });
+});