diff --git a/extensions/synthetic/onboard.test.ts b/extensions/synthetic/onboard.test.ts
index f71ffa9fbbe..0a2f67f900e 100644
--- a/extensions/synthetic/onboard.test.ts
+++ b/extensions/synthetic/onboard.test.ts
@@ -1,6 +1,8 @@
-import { resolveAgentModelPrimaryValue } from "openclaw/plugin-sdk/provider-onboard";
 import { describe, expect, it } from "vitest";
-import { expectProviderOnboardMergedLegacyConfig } from "../../test/helpers/plugins/provider-onboard.js";
+import {
+  expectProviderOnboardMergedLegacyConfig,
+  expectProviderOnboardPrimaryModel,
+} from "../../test/helpers/plugins/provider-onboard.js";
 import { SYNTHETIC_DEFAULT_MODEL_REF as SYNTHETIC_DEFAULT_MODEL_REF_PUBLIC } from "./api.js";
 import {
   applySyntheticConfig,
@@ -15,9 +17,18 @@ describe("synthetic onboard", () => {
       baseUrl: "https://api.synthetic.new/anthropic",
       api: "anthropic-messages",
     });
-    expect(resolveAgentModelPrimaryValue(cfg.agents?.defaults?.model)).toBe(
-      SYNTHETIC_DEFAULT_MODEL_REF_PUBLIC,
-    );
+    expectProviderOnboardPrimaryModel({
+      applyConfig: applySyntheticConfig,
+      modelRef: SYNTHETIC_DEFAULT_MODEL_REF_PUBLIC,
+    });
+  });
+
+  it("keeps the public default model ref aligned", () => {
+    expect(SYNTHETIC_DEFAULT_MODEL_REF).toBe(SYNTHETIC_DEFAULT_MODEL_REF_PUBLIC);
+    expectProviderOnboardPrimaryModel({
+      applyConfig: applySyntheticConfig,
+      modelRef: SYNTHETIC_DEFAULT_MODEL_REF,
+    });
   });
 
   it("merges existing synthetic provider models", () => {
diff --git a/extensions/xiaomi/onboard.test.ts b/extensions/xiaomi/onboard.test.ts
index f45af114055..12d5e1183ea 100644
--- a/extensions/xiaomi/onboard.test.ts
+++ b/extensions/xiaomi/onboard.test.ts
@@ -1,6 +1,8 @@
-import { resolveAgentModelPrimaryValue } from "openclaw/plugin-sdk/provider-onboard";
 import { describe, expect, it } from "vitest";
-import { expectProviderOnboardMergedLegacyConfig } from "../../test/helpers/plugins/provider-onboard.js";
+import {
+  expectProviderOnboardMergedLegacyConfig,
+  expectProviderOnboardPrimaryModel,
+} from "../../test/helpers/plugins/provider-onboard.js";
 import { applyXiaomiConfig, applyXiaomiProviderConfig } from "./onboard.js";
 
 describe("xiaomi onboard", () => {
@@ -15,7 +17,10 @@ describe("xiaomi onboard", () => {
       "mimo-v2-pro",
       "mimo-v2-omni",
     ]);
-    expect(resolveAgentModelPrimaryValue(cfg.agents?.defaults?.model)).toBe("xiaomi/mimo-v2-flash");
+    expectProviderOnboardPrimaryModel({
+      applyConfig: applyXiaomiConfig,
+      modelRef: "xiaomi/mimo-v2-flash",
+    });
   });
 
   it("merges Xiaomi models and keeps existing provider overrides", () => {
diff --git a/test/helpers/plugins/provider-onboard.ts b/test/helpers/plugins/provider-onboard.ts
index cf50b3f2e8e..894c972a2e5 100644
--- a/test/helpers/plugins/provider-onboard.ts
+++ b/test/helpers/plugins/provider-onboard.ts
@@ -35,8 +35,7 @@ export function expectProviderOnboardPrimaryAndFallbacks(params: {
   applyConfig: (config: OpenClawConfig) => OpenClawConfig;
   modelRef: string;
 }) {
-  const cfg = params.applyConfig({});
-  expect(resolveAgentModelPrimaryValue(cfg.agents?.defaults?.model)).toBe(params.modelRef);
+  expectProviderOnboardPrimaryModel(params);
 
   const cfgWithFallbacks = params.applyConfig(createConfigWithFallbacks());
   expect(resolveAgentModelFallbackValues(cfgWithFallbacks.agents?.defaults?.model)).toEqual([
@@ -44,6 +43,14 @@ export function expectProviderOnboardPrimaryAndFallbacks(params: {
   ]);
 }
 
+export function expectProviderOnboardPrimaryModel(params: {
+  applyConfig: (config: OpenClawConfig) => OpenClawConfig;
+  modelRef: string;
+}) {
+  const cfg = params.applyConfig({});
+  expect(resolveAgentModelPrimaryValue(cfg.agents?.defaults?.model)).toBe(params.modelRef);
+}
+
 export function expectProviderOnboardPreservesPrimary(params: {
   applyProviderConfig: (config: OpenClawConfig) => OpenClawConfig;
   primaryModelRef: string;