fix(ai): route xAI search through Responses API as native tools (#21037)

xAI deprecated Live Search, so the `searchParameters` provider option
now returns 410. This routes all xAI models through the Responses API
and binds web/X search as native agent tools, matching how
Anthropic/OpenAI expose search.

- xAI provider now uses `provider.responses()` — its
`webSearch()`/`xSearch()` tools only run against the Responses endpoint,
not chat completions
- web/X search migrated from the `provider-option` variant to `sdk-tool`
(`web_search`/`x_search`); deleted the dead `searchParameters` path, the
`provider-option` variant, and `providerOptions` on `NativeModelBinding`
- dropped a dead `rolePermissionConfig` param on `getAgentRoleId`, left
over from #20331

---------

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Félix Malfait <FelixMalfait@users.noreply.github.com>

packages/twenty-server/src/engine/metadata-modules/ai/ai-agent-execution/services/__tests__/agent-async-executor.service.spec.ts

@@ -79,7 +79,7 @@ describe('AgentAsyncExecutorService — workflow agent role-scoped tool resoluti
         {
           provide: NativeToolBinderService,
           useValue: {
-            bind: jest.fn().mockReturnValue({ tools: {}, providerOptions: {} }),
+            bind: jest.fn().mockReturnValue({}),
           },
         },
         {

packages/twenty-server/src/engine/metadata-modules/ai/ai-agent-execution/services/agent-async-executor.service.ts

@@ -18,7 +18,6 @@ import { isUserAuthContext } from 'src/engine/core-modules/auth/guards/is-user-a
 import { type WorkspaceAuthContext } from 'src/engine/core-modules/auth/types/workspace-auth-context.type';
 import { BillingUsageService } from 'src/engine/core-modules/billing/services/billing-usage.service';
 import { type ToolProviderContext } from 'src/engine/core-modules/tool-provider/interfaces/tool-provider-context.type';
-import { NativeToolBinderService } from 'src/engine/metadata-modules/ai/ai-models/services/native-tool-binder.service';
 import { ToolRegistryService } from 'src/engine/core-modules/tool-provider/services/tool-registry.service';
 import { UsageOperationType } from 'src/engine/core-modules/usage/enums/usage-operation-type.enum';
 import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
@@ -39,6 +38,7 @@ import { mergeLanguageModelUsage } from 'src/engine/metadata-modules/ai/ai-billi
 import { AI_TELEMETRY_CONFIG } from 'src/engine/metadata-modules/ai/ai-models/constants/ai-telemetry.const';
 import { AiModelConfigService } from 'src/engine/metadata-modules/ai/ai-models/services/ai-model-config.service';
 import { AiModelRegistryService } from 'src/engine/metadata-modules/ai/ai-models/services/ai-model-registry.service';
+import { NativeToolBinderService } from 'src/engine/metadata-modules/ai/ai-models/services/native-tool-binder.service';
 import { type NativeModelToolOptions } from 'src/engine/metadata-modules/ai/ai-models/types/native-model-tool-options.type';
 import {
   AiException,
@@ -87,7 +87,6 @@ export class AgentAsyncExecutorService {
   private async getAgentRoleId(
     agentId: string,
     workspaceId: string,
-    rolePermissionConfig?: RolePermissionConfig,
   ): Promise<string | undefined> {
     const roleTarget = await this.roleTargetRepository.findOne(workspaceId, {
       where: {
@@ -188,22 +187,20 @@ export class AgentAsyncExecutorService {
           );
         }
 
-        const nativeBinding = this.nativeToolBinder.bind(
+        const nativeTools = this.nativeToolBinder.bind(
           registeredModel,
           nativeModelToolOptions,
         );
 
         tools = {
           ...registryTools,
-          ...nativeBinding.tools,
+          ...nativeTools,
         };
 
-        providerOptions = {
-          ...nativeBinding.providerOptions,
-          ...this.aiModelConfigService.getReasoningProviderOptions(
+        providerOptions =
+          this.aiModelConfigService.getReasoningProviderOptions(
             registeredModel,
-          ),
-        };
+          );
       }
 
       this.logger.log(`Generated ${Object.keys(tools).length} tools for agent`);