Reuse Ai Cognitive services

Author: Shreyas-Microsoft

infra/main.bicep

@@ -227,8 +227,9 @@ module aiServices 'modules/ai-foundry/main.bicep' = {
     kind: 'AIServices'
     deployments: [modelDeployment]
     projectName: 'proj-${resourcesName}'
+    projectDescription: 'aifp-${solutionUniqueToken}'
     logAnalyticsWorkspaceResourceId: enableMonitoring ? logAnalyticsWorkspaceResourceId : ''
-    azureExistingAIProjectResourceId: azureExistingAIProjectResourceId
+    existingFoundryProjectResourceId: azureExistingAIProjectResourceId
     privateNetworking: enablePrivateNetworking
       ? {
           virtualNetworkResourceId: network.outputs.vnetResourceId
@@ -311,9 +312,9 @@ module keyVault 'modules/keyVault.bicep' = {
       : null
     roleAssignments: [
       {
-        principalId: aiServices.outputs.?systemAssignedMIPrincipalId ?? ''
+        principalId: aiServices.outputs.?systemAssignedMIPrincipalId ?? appIdentity.outputs.principalId
         principalType: 'ServicePrincipal'
-        roleDefinitionIdOrName: 'Key Vault Reader'
+        roleDefinitionIdOrName: 'Key Vault Administrator'
       }
     ]
     tags: allTags
@@ -470,15 +471,15 @@ module containerAppBackend 'br/public:avm/res/app/container-app:0.17.0' = {
             }
             {
               name: 'AI_PROJECT_ENDPOINT'
-              value: aiServices.outputs.project.apiEndpoint // or equivalent
+              value: aiServices.outputs.aiProjectInfo.apiEndpoint // or equivalent
             }
             {
               name: 'AZURE_AI_AGENT_PROJECT_CONNECTION_STRING' // This was not really used in code. 
-              value: aiServices.outputs.project.apiEndpoint
+              value: aiServices.outputs.aiProjectInfo.apiEndpoint
             }
             {
               name: 'AZURE_AI_AGENT_PROJECT_NAME'
-              value: aiServices.outputs.project.name
+              value: aiServices.outputs.aiProjectInfo.name
             }
             {
               name: 'AZURE_AI_AGENT_RESOURCE_GROUP_NAME'
@@ -490,7 +491,7 @@ module containerAppBackend 'br/public:avm/res/app/container-app:0.17.0' = {
             }
             {
               name: 'AZURE_AI_AGENT_ENDPOINT'
-              value: aiServices.outputs.project.apiEndpoint
+              value: aiServices.outputs.aiProjectInfo.apiEndpoint
             }
             {
               name: 'AZURE_CLIENT_ID'

infra/modules/ai-foundry/ai-services.bicep

@@ -60,6 +60,9 @@ param sku string = 'S0'
 @description('Optional. Location for all Resources.')
 param location string = resourceGroup().location
 
+@description('Optional. Use this parameter to use an existing Cognitive Services resource ID from different resource group')
+param azureExistingCognitiveServiceResourceId string = ''
+
 import { diagnosticSettingFullType } from 'br/public:avm/utl/types/avm-common-types:0.5.1'
 @description('Optional. The diagnostic settings of the service.')
 param diagnosticSettings diagnosticSettingFullType[]?
@@ -123,6 +126,13 @@ param managedIdentities managedIdentityAllType?
 @description('Optional. Array of deployments about cognitive service accounts to create.')
 param deployments deploymentType[]?
 
+// Determine if we should reuse existing Cognitive Services resource
+var useExistingCognitiveService = !empty(azureExistingCognitiveServiceResourceId)
+var existingCogServiceName = useExistingCognitiveService ? last(split(azureExistingCognitiveServiceResourceId, '/')) : ''
+var existingCogServiceRgName = useExistingCognitiveService ? split(azureExistingCognitiveServiceResourceId, '/')[4] : ''
+var existingCogServiceSubscriptionId = useExistingCognitiveService ? split(azureExistingCognitiveServiceResourceId, '/')[2] : ''
+var existingCogServiceEndpoint = useExistingCognitiveService ? format('https://{0}.cognitiveservices.azure.com/', existingCogServiceName) : ''
+
 var enableReferencedModulesTelemetry = false
 
 var formattedUserAssignedIdentities = reduce(
@@ -260,7 +270,14 @@ var formattedRoleAssignments = [
   })
 ]
 
-resource cognitiveService 'Microsoft.CognitiveServices/accounts@2025-04-01-preview' = {
+// Reference to existing Cognitive Services account
+resource existingCognitiveService 'Microsoft.CognitiveServices/accounts@2025-04-01-preview' existing = if (useExistingCognitiveService) {
+  name: existingCogServiceName
+  scope: resourceGroup(existingCogServiceSubscriptionId, existingCogServiceRgName)
+}
+
+// Create new Cognitive Services account only if not reusing existing one
+resource cognitiveService 'Microsoft.CognitiveServices/accounts@2025-04-01-preview' = if (!useExistingCognitiveService) {
   name: name
   kind: kind
   identity: identity
@@ -307,7 +324,7 @@ resource cognitiveService 'Microsoft.CognitiveServices/accounts@2025-04-01-previ
 
 @batchSize(1)
 resource cognitiveService_deployments 'Microsoft.CognitiveServices/accounts/deployments@2024-10-01' = [
-  for (deployment, index) in (deployments ?? []): {
+  for (deployment, index) in (useExistingCognitiveService ? [] : (deployments ?? [])): {
     parent: cognitiveService
     name: deployment.?name ?? '${name}-deployments'
     properties: {
@@ -327,7 +344,7 @@ resource cognitiveService_deployments 'Microsoft.CognitiveServices/accounts/depl
 
 #disable-next-line use-recent-api-versions
 resource cognitiveService_diagnosticSettings 'Microsoft.Insights/diagnosticSettings@2021-05-01-preview' = [
-  for (diagnosticSetting, index) in (diagnosticSettings ?? []): {
+  for (diagnosticSetting, index) in (useExistingCognitiveService ? [] : (diagnosticSettings ?? [])): {
     name: diagnosticSetting.?name ?? '${name}-diagnosticSettings'
     properties: {
       storageAccountId: diagnosticSetting.?storageAccountResourceId
@@ -354,9 +371,9 @@ resource cognitiveService_diagnosticSettings 'Microsoft.Insights/diagnosticSetti
     scope: cognitiveService
   }
 ]
-
+//
 module cognitiveService_privateEndpoints 'br/public:avm/res/network/private-endpoint:0.11.0' = [
-  for (privateEndpoint, index) in (privateEndpoints ?? []): {
+  for (privateEndpoint, index) in (useExistingCognitiveService ? [] : (privateEndpoints ?? [])): {
     name: take('${uniqueString(deployment().name, location)}-cognitiveService-PrivateEndpoint-${index}', 64)
     scope: resourceGroup(
       split(privateEndpoint.?resourceGroupResourceId ?? resourceGroup().id, '/')[2],
@@ -410,7 +427,7 @@ module cognitiveService_privateEndpoints 'br/public:avm/res/network/private-endp
 ]
 
 resource cognitiveService_roleAssignments 'Microsoft.Authorization/roleAssignments@2022-04-01' = [
-  for (roleAssignment, index) in (formattedRoleAssignments ?? []): {
+  for (roleAssignment, index) in (useExistingCognitiveService ? [] : (formattedRoleAssignments ?? [])): {
     name: roleAssignment.?name ?? guid(cognitiveService.id, roleAssignment.principalId, roleAssignment.roleDefinitionId)
     properties: {
       roleDefinitionId: roleAssignment.roleDefinitionId
@@ -425,26 +442,41 @@ resource cognitiveService_roleAssignments 'Microsoft.Authorization/roleAssignmen
   }
 ]
 
+// Role assignments for existing Cognitive Services from different resource group
+module existingCognitiveService_roleAssignments 'br/public:avm/ptn/authorization/resource-role-assignment:0.1.2' = [
+  for (roleAssignment, i) in (useExistingCognitiveService ? formattedRoleAssignments : []): {
+    name: 'existing-cog-role-${i}-${take(uniqueString(azureExistingCognitiveServiceResourceId, roleAssignment.roleDefinitionId, roleAssignment.principalId), 8)}'
+    scope: resourceGroup(existingCogServiceSubscriptionId, existingCogServiceRgName)
+    params: {
+      roleDefinitionId: roleAssignment.roleDefinitionId
+      principalId: roleAssignment.principalId
+      principalType: roleAssignment.?principalType ?? 'ServicePrincipal'
+      resourceId: azureExistingCognitiveServiceResourceId
+      enableTelemetry: enableReferencedModulesTelemetry
+    }
+  }
+]
+
 @description('The name of the cognitive services account.')
-output name string = cognitiveService.name
+output name string = useExistingCognitiveService ? existingCogServiceName : cognitiveService.name
 
 @description('The resource ID of the cognitive services account.')
-output resourceId string = cognitiveService.id
+output resourceId string = useExistingCognitiveService ? azureExistingCognitiveServiceResourceId : cognitiveService.id
 
 @description('The resource group the cognitive services account was deployed into.')
-output resourceGroupName string = resourceGroup().name
+output resourceGroupName string = useExistingCognitiveService ? existingCogServiceRgName : resourceGroup().name
 
 @description('The service endpoint of the cognitive services account.')
-output endpoint string = cognitiveService.properties.endpoint
+output endpoint string = useExistingCognitiveService ? existingCogServiceEndpoint : cognitiveService.properties.endpoint
 
 @description('All endpoints available for the cognitive services account, types depends on the cognitive service kind.')
-output endpoints endpointType = cognitiveService.properties.endpoints
+output endpoints endpointType = useExistingCognitiveService ? {} : cognitiveService.properties.endpoints
 
 @description('The principal ID of the system assigned identity.')
-output systemAssignedMIPrincipalId string? = cognitiveService.?identity.?principalId
+output systemAssignedMIPrincipalId string? = useExistingCognitiveService ? null : cognitiveService.?identity.?principalId
 
 @description('The location the resource was deployed into.')
-output location string = cognitiveService.location
+output location string = useExistingCognitiveService ? reference(azureExistingCognitiveServiceResourceId, '2025-04-01-preview', 'Full').location : cognitiveService.location
 
 @description('The private endpoints of the congitive services account.')
 output privateEndpoints privateEndpointOutputType[] = [