diff --git a/src/acp/runtime/error-text.test.ts b/src/acp/runtime/error-text.test.ts
index b58cd3ef4fb..14f7ff91f55 100644
--- a/src/acp/runtime/error-text.test.ts
+++ b/src/acp/runtime/error-text.test.ts
@@ -7,13 +7,15 @@ describe("formatAcpRuntimeErrorText", () => {
     const text = formatAcpRuntimeErrorText(
       new AcpRuntimeError("ACP_BACKEND_MISSING", "backend missing"),
     );
-    expect(text).toContain("ACP error (ACP_BACKEND_MISSING): backend missing");
-    expect(text).toContain("next:");
+    expect(text).toBe(
+      "ACP error (ACP_BACKEND_MISSING): backend missing\nnext: Run `/acp doctor`, install/enable the backend plugin, then retry.",
+    );
   });
 
   it("returns consistent ACP error envelope for runtime failures", () => {
     const text = formatAcpRuntimeErrorText(new AcpRuntimeError("ACP_TURN_FAILED", "turn failed"));
-    expect(text).toContain("ACP error (ACP_TURN_FAILED): turn failed");
-    expect(text).toContain("next:");
+    expect(text).toBe(
+      "ACP error (ACP_TURN_FAILED): turn failed\nnext: Retry, or use `/acp cancel` and send the message again.",
+    );
   });
 });