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Merged
mattKorwel merged 6 commits into from
Oct 28, 2025
Merged

Disable model routing for oauth users #11889

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mrcabbage972 Oct 23, 2025
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mrcabbage972 Oct 23, 2025
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mrcabbage972 Oct 23, 2025
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mrcabbage972 Oct 23, 2025
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Merge branch 'main' into mrcabbage972/routing-auth-disable-2
mrcabbage972 Oct 27, 2025
55a9ae7
Merge branch 'main' into mrcabbage972/routing-auth-disable-2
mattKorwel Oct 28, 2025
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77 changes: 66 additions & 11 deletions packages/core/src/config/config.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -556,29 +556,84 @@ describe('Server Config (config.ts)', () => {
});
});

describe('UseModelRouter Configuration', () => {
it('should default useModelRouter to false when not provided', () => {
const config = new Config(baseParams);
describe('Model Router with Auth', () => {
it('should disable model router by default for oauth-personal', async () => {
const config = new Config({
...baseParams,
useModelRouter: true,
});
await config.refreshAuth(AuthType.LOGIN_WITH_GOOGLE);
expect(config.getUseModelRouter()).toBe(false);
});

it('should set useModelRouter to true when provided as true', () => {
const paramsWithModelRouter: ConfigParameters = {
it('should enable model router by default for other auth types', async () => {
const config = new Config({
...baseParams,
useModelRouter: true,
};
const config = new Config(paramsWithModelRouter);
});
await config.refreshAuth(AuthType.USE_GEMINI);
expect(config.getUseModelRouter()).toBe(true);
});

it('should disable model router for specified auth type', async () => {
const config = new Config({
...baseParams,
useModelRouter: true,
disableModelRouterForAuth: [AuthType.USE_GEMINI],
});
await config.refreshAuth(AuthType.USE_GEMINI);
expect(config.getUseModelRouter()).toBe(false);
});

it('should enable model router for other auth type', async () => {
const config = new Config({
...baseParams,
useModelRouter: true,
disableModelRouterForAuth: [],
});
await config.refreshAuth(AuthType.LOGIN_WITH_GOOGLE);
expect(config.getUseModelRouter()).toBe(true);
});

it('should set useModelRouter to false when explicitly provided as false', () => {
const paramsWithModelRouter: ConfigParameters = {
it('should keep model router disabled when useModelRouter is false', async () => {
const config = new Config({
...baseParams,
useModelRouter: false,
};
const config = new Config(paramsWithModelRouter);
disableModelRouterForAuth: [AuthType.USE_GEMINI],
});
await config.refreshAuth(AuthType.LOGIN_WITH_GOOGLE);
expect(config.getUseModelRouter()).toBe(false);
});

it('should keep the user-chosen model after refreshAuth, even when model router is disabled for the auth type', async () => {
const config = new Config({
...baseParams,
useModelRouter: true,
disableModelRouterForAuth: [AuthType.USE_GEMINI],
});
const chosenModel = 'gemini-1.5-pro-latest';
config.setModel(chosenModel);

await config.refreshAuth(AuthType.USE_GEMINI);

expect(config.getUseModelRouter()).toBe(false);
expect(config.getModel()).toBe(chosenModel);
});

it('should keep the user-chosen model after refreshAuth, when model router is enabled for the auth type', async () => {
const config = new Config({
...baseParams,
useModelRouter: true,
disableModelRouterForAuth: [AuthType.USE_GEMINI],
});
const chosenModel = 'gemini-1.5-pro-latest';
config.setModel(chosenModel);

await config.refreshAuth(AuthType.LOGIN_WITH_GOOGLE);

expect(config.getUseModelRouter()).toBe(true);
expect(config.getModel()).toBe(chosenModel);
});
});

describe('ContinueOnFailedApiCall Configuration', () => {
Expand Down
22 changes: 20 additions & 2 deletions packages/core/src/config/config.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@ import {
DEFAULT_GEMINI_EMBEDDING_MODEL,
DEFAULT_GEMINI_FLASH_MODEL,
DEFAULT_GEMINI_MODEL,
DEFAULT_GEMINI_MODEL_AUTO,
DEFAULT_THINKING_MODE,
} from './models.js';
import { shouldAttemptBrowserLaunch } from '../utils/browser.js';
Expand Down Expand Up @@ -279,6 +280,7 @@ export interface ConfigParameters {
output?: OutputSettings;
useModelRouter?: boolean;
enableMessageBusIntegration?: boolean;
disableModelRouterForAuth?: AuthType[];
codebaseInvestigatorSettings?: CodebaseInvestigatorSettings;
continueOnFailedApiCall?: boolean;
retryFetchErrors?: boolean;
Expand Down Expand Up @@ -377,7 +379,9 @@ export class Config {
private readonly messageBus: MessageBus;
private readonly policyEngine: PolicyEngine;
private readonly outputSettings: OutputSettings;
private readonly useModelRouter: boolean;
private useModelRouter: boolean;
private readonly initialUseModelRouter: boolean;
private readonly disableModelRouterForAuth?: AuthType[];
Comment on lines +382 to +384

@gemini-code-assist gemini-code-assist Bot Oct 23, 2025

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critical

These new properties are correctly defined to control model routing based on authentication. However, the useModelRouter flag is not being checked before the model router is invoked in packages/core/src/core/client.ts (specifically in the sendMessageStream method). This means the router is always called, regardless of this configuration, which makes this new feature non-functional.

To fix this, you'll need to add a check for this.config.getUseModelRouter() in client.ts to conditionally bypass the routing logic.

private readonly enableMessageBusIntegration: boolean;
private readonly codebaseInvestigatorSettings: CodebaseInvestigatorSettings;
private readonly continueOnFailedApiCall: boolean;
Expand Down Expand Up @@ -477,7 +481,11 @@ export class Config {
this.enableToolOutputTruncation = params.enableToolOutputTruncation ?? true;
this.useSmartEdit = params.useSmartEdit ?? true;
this.useWriteTodos = params.useWriteTodos ?? false;
this.useModelRouter = params.useModelRouter ?? false;
this.initialUseModelRouter = params.useModelRouter ?? false;
this.useModelRouter = this.initialUseModelRouter;
this.disableModelRouterForAuth = params.disableModelRouterForAuth ?? [
AuthType.LOGIN_WITH_GOOGLE,
];
this.enableMessageBusIntegration =
params.enableMessageBusIntegration ?? false;
this.codebaseInvestigatorSettings = {
Expand Down Expand Up @@ -551,6 +559,16 @@ export class Config {
}

async refreshAuth(authMethod: AuthType) {
this.useModelRouter = this.initialUseModelRouter;
if (this.disableModelRouterForAuth?.includes(authMethod)) {
this.useModelRouter = false;
if (this.model === DEFAULT_GEMINI_MODEL_AUTO) {
this.model = DEFAULT_GEMINI_MODEL;
}
} else if (this.useModelRouter && this.model === DEFAULT_GEMINI_MODEL) {
this.model = DEFAULT_GEMINI_MODEL_AUTO;
}

// Vertex and Genai have incompatible encryption and sending history with
// thoughtSignature from Genai to Vertex will fail, we need to strip them
if (
Expand Down
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