diff --git a/src/DiscoveryEngine.php b/src/DiscoveryEngine.php
index 7be577bb70..7cbe52e2eb 100644
--- a/src/DiscoveryEngine.php
+++ b/src/DiscoveryEngine.php
@@ -78,7 +78,11 @@ class DiscoveryEngine extends \Google\Service
   public $projects_locations_collections_dataStores_widgetConfigs;
   public $projects_locations_collections_engines;
   public $projects_locations_collections_engines_assistants;
+  public $projects_locations_collections_engines_assistants_agents;
+  public $projects_locations_collections_engines_assistants_agents_message;
   public $projects_locations_collections_engines_assistants_agents_operations;
+  public $projects_locations_collections_engines_assistants_agents_tasks;
+  public $projects_locations_collections_engines_assistants_agents_tasks_pushNotificationConfigs;
   public $projects_locations_collections_engines_completionConfig;
   public $projects_locations_collections_engines_controls;
   public $projects_locations_collections_engines_conversations;
@@ -2008,6 +2012,56 @@ public function __construct($clientOrConfig = [], $rootUrl = null)
           ]
         ]
     );
+    $this->projects_locations_collections_engines_assistants_agents = new DiscoveryEngine\Resource\ProjectsLocationsCollectionsEnginesAssistantsAgents(
+        $this,
+        $this->serviceName,
+        'agents',
+        [
+          'methods' => [
+            'getCard' => [
+              'path' => '{+tenant}/card',
+              'httpMethod' => 'GET',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],
+          ]
+        ]
+    );
+    $this->projects_locations_collections_engines_assistants_agents_message = new DiscoveryEngine\Resource\ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage(
+        $this,
+        $this->serviceName,
+        'message',
+        [
+          'methods' => [
+            'send' => [
+              'path' => '{+tenant}/message:send',
+              'httpMethod' => 'POST',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],'stream' => [
+              'path' => '{+tenant}/message:stream',
+              'httpMethod' => 'POST',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],
+          ]
+        ]
+    );
     $this->projects_locations_collections_engines_assistants_agents_operations = new DiscoveryEngine\Resource\ProjectsLocationsCollectionsEnginesAssistantsAgentsOperations(
         $this,
         $this->serviceName,
@@ -2028,6 +2082,147 @@ public function __construct($clientOrConfig = [], $rootUrl = null)
           ]
         ]
     );
+    $this->projects_locations_collections_engines_assistants_agents_tasks = new DiscoveryEngine\Resource\ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks(
+        $this,
+        $this->serviceName,
+        'tasks',
+        [
+          'methods' => [
+            'cancel' => [
+              'path' => '{+tenant}/{+name}:cancel',
+              'httpMethod' => 'POST',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'name' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],'get' => [
+              'path' => '{+tenant}/{+name}',
+              'httpMethod' => 'GET',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'name' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'historyLength' => [
+                  'location' => 'query',
+                  'type' => 'integer',
+                ],
+              ],
+            ],'subscribe' => [
+              'path' => '{+tenant}/{+name}:subscribe',
+              'httpMethod' => 'GET',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'name' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],
+          ]
+        ]
+    );
+    $this->projects_locations_collections_engines_assistants_agents_tasks_pushNotificationConfigs = new DiscoveryEngine\Resource\ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs(
+        $this,
+        $this->serviceName,
+        'pushNotificationConfigs',
+        [
+          'methods' => [
+            'create' => [
+              'path' => '{+tenant}/{+parent}',
+              'httpMethod' => 'POST',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'parent' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'configId' => [
+                  'location' => 'query',
+                  'type' => 'string',
+                ],
+              ],
+            ],'delete' => [
+              'path' => '{+tenant}/{+name}',
+              'httpMethod' => 'DELETE',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'name' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],'get' => [
+              'path' => '{+tenant}/{+name}',
+              'httpMethod' => 'GET',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'name' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+              ],
+            ],'list' => [
+              'path' => '{+tenant}/{+parent}/pushNotificationConfigs',
+              'httpMethod' => 'GET',
+              'parameters' => [
+                'tenant' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'parent' => [
+                  'location' => 'path',
+                  'type' => 'string',
+                  'required' => true,
+                ],
+                'pageSize' => [
+                  'location' => 'query',
+                  'type' => 'integer',
+                ],
+                'pageToken' => [
+                  'location' => 'query',
+                  'type' => 'string',
+                ],
+              ],
+            ],
+          ]
+        ]
+    );
     $this->projects_locations_collections_engines_completionConfig = new DiscoveryEngine\Resource\ProjectsLocationsCollectionsEnginesCompletionConfig(
         $this,
         $this->serviceName,
diff --git a/src/DiscoveryEngine/A2aV1APIKeySecurityScheme.php b/src/DiscoveryEngine/A2aV1APIKeySecurityScheme.php
new file mode 100644
index 0000000000..292ba1e18b
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1APIKeySecurityScheme.php
@@ -0,0 +1,92 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1APIKeySecurityScheme extends \Google\Model
+{
+  /**
+   * Description of this security scheme.
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * Location of the API key, valid values are "query", "header", or "cookie"
+   *
+   * @var string
+   */
+  public $location;
+  /**
+   * Name of the header, query or cookie parameter to be used.
+   *
+   * @var string
+   */
+  public $name;
+
+  /**
+   * Description of this security scheme.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * Location of the API key, valid values are "query", "header", or "cookie"
+   *
+   * @param string $location
+   */
+  public function setLocation($location)
+  {
+    $this->location = $location;
+  }
+  /**
+   * @return string
+   */
+  public function getLocation()
+  {
+    return $this->location;
+  }
+  /**
+   * Name of the header, query or cookie parameter to be used.
+   *
+   * @param string $name
+   */
+  public function setName($name)
+  {
+    $this->name = $name;
+  }
+  /**
+   * @return string
+   */
+  public function getName()
+  {
+    return $this->name;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1APIKeySecurityScheme::class, 'Google_Service_DiscoveryEngine_A2aV1APIKeySecurityScheme');
diff --git a/src/DiscoveryEngine/A2aV1AgentCapabilities.php b/src/DiscoveryEngine/A2aV1AgentCapabilities.php
new file mode 100644
index 0000000000..364a6041a8
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentCapabilities.php
@@ -0,0 +1,89 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentCapabilities extends \Google\Collection
+{
+  protected $collection_key = 'extensions';
+  protected $extensionsType = A2aV1AgentExtension::class;
+  protected $extensionsDataType = 'array';
+  /**
+   * If the agent can send push notifications to the clients webhook
+   *
+   * @var bool
+   */
+  public $pushNotifications;
+  /**
+   * If the agent will support streaming responses
+   *
+   * @var bool
+   */
+  public $streaming;
+
+  /**
+   * Extensions supported by this agent.
+   *
+   * @param A2aV1AgentExtension[] $extensions
+   */
+  public function setExtensions($extensions)
+  {
+    $this->extensions = $extensions;
+  }
+  /**
+   * @return A2aV1AgentExtension[]
+   */
+  public function getExtensions()
+  {
+    return $this->extensions;
+  }
+  /**
+   * If the agent can send push notifications to the clients webhook
+   *
+   * @param bool $pushNotifications
+   */
+  public function setPushNotifications($pushNotifications)
+  {
+    $this->pushNotifications = $pushNotifications;
+  }
+  /**
+   * @return bool
+   */
+  public function getPushNotifications()
+  {
+    return $this->pushNotifications;
+  }
+  /**
+   * If the agent will support streaming responses
+   *
+   * @param bool $streaming
+   */
+  public function setStreaming($streaming)
+  {
+    $this->streaming = $streaming;
+  }
+  /**
+   * @return bool
+   */
+  public function getStreaming()
+  {
+    return $this->streaming;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentCapabilities::class, 'Google_Service_DiscoveryEngine_A2aV1AgentCapabilities');
diff --git a/src/DiscoveryEngine/A2aV1AgentCard.php b/src/DiscoveryEngine/A2aV1AgentCard.php
new file mode 100644
index 0000000000..3baf18d466
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentCard.php
@@ -0,0 +1,416 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentCard extends \Google\Collection
+{
+  protected $collection_key = 'skills';
+  protected $additionalInterfacesType = A2aV1AgentInterface::class;
+  protected $additionalInterfacesDataType = 'array';
+  protected $capabilitiesType = A2aV1AgentCapabilities::class;
+  protected $capabilitiesDataType = '';
+  /**
+   * protolint:enable REPEATED_FIELD_NAMES_PLURALIZED The set of interaction
+   * modes that the agent supports across all skills. This can be overridden per
+   * skill. Defined as mime types.
+   *
+   * @var string[]
+   */
+  public $defaultInputModes;
+  /**
+   * The mime types supported as outputs from this agent.
+   *
+   * @var string[]
+   */
+  public $defaultOutputModes;
+  /**
+   * A description of the agent's domain of action/solution space. Example:
+   * "Agent that helps users with recipes and cooking."
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * A url to provide additional documentation about the agent.
+   *
+   * @var string
+   */
+  public $documentationUrl;
+  /**
+   * An optional URL to an icon for the agent.
+   *
+   * @var string
+   */
+  public $iconUrl;
+  /**
+   * A human readable name for the agent. Example: "Recipe Agent"
+   *
+   * @var string
+   */
+  public $name;
+  /**
+   * The transport of the preferred endpoint. If empty, defaults to JSONRPC.
+   *
+   * @var string
+   */
+  public $preferredTransport;
+  /**
+   * The version of the A2A protocol this agent supports.
+   *
+   * @var string
+   */
+  public $protocolVersion;
+  protected $providerType = A2aV1AgentProvider::class;
+  protected $providerDataType = '';
+  protected $securityType = A2aV1Security::class;
+  protected $securityDataType = 'array';
+  protected $securitySchemesType = A2aV1SecurityScheme::class;
+  protected $securitySchemesDataType = 'map';
+  protected $signaturesType = A2aV1AgentCardSignature::class;
+  protected $signaturesDataType = 'array';
+  protected $skillsType = A2aV1AgentSkill::class;
+  protected $skillsDataType = 'array';
+  /**
+   * Whether the agent supports providing an extended agent card when the user
+   * is authenticated, i.e. is the card from .well-known different than the card
+   * from GetAgentCard.
+   *
+   * @var bool
+   */
+  public $supportsAuthenticatedExtendedCard;
+  /**
+   * A URL to the address the agent is hosted at. This represents the preferred
+   * endpoint as declared by the agent.
+   *
+   * @var string
+   */
+  public $url;
+  /**
+   * The version of the agent. Example: "1.0.0"
+   *
+   * @var string
+   */
+  public $version;
+
+  /**
+   * Announcement of additional supported transports. Client can use any of the
+   * supported transports.
+   *
+   * @param A2aV1AgentInterface[] $additionalInterfaces
+   */
+  public function setAdditionalInterfaces($additionalInterfaces)
+  {
+    $this->additionalInterfaces = $additionalInterfaces;
+  }
+  /**
+   * @return A2aV1AgentInterface[]
+   */
+  public function getAdditionalInterfaces()
+  {
+    return $this->additionalInterfaces;
+  }
+  /**
+   * A2A Capability set supported by the agent.
+   *
+   * @param A2aV1AgentCapabilities $capabilities
+   */
+  public function setCapabilities(A2aV1AgentCapabilities $capabilities)
+  {
+    $this->capabilities = $capabilities;
+  }
+  /**
+   * @return A2aV1AgentCapabilities
+   */
+  public function getCapabilities()
+  {
+    return $this->capabilities;
+  }
+  /**
+   * protolint:enable REPEATED_FIELD_NAMES_PLURALIZED The set of interaction
+   * modes that the agent supports across all skills. This can be overridden per
+   * skill. Defined as mime types.
+   *
+   * @param string[] $defaultInputModes
+   */
+  public function setDefaultInputModes($defaultInputModes)
+  {
+    $this->defaultInputModes = $defaultInputModes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getDefaultInputModes()
+  {
+    return $this->defaultInputModes;
+  }
+  /**
+   * The mime types supported as outputs from this agent.
+   *
+   * @param string[] $defaultOutputModes
+   */
+  public function setDefaultOutputModes($defaultOutputModes)
+  {
+    $this->defaultOutputModes = $defaultOutputModes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getDefaultOutputModes()
+  {
+    return $this->defaultOutputModes;
+  }
+  /**
+   * A description of the agent's domain of action/solution space. Example:
+   * "Agent that helps users with recipes and cooking."
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * A url to provide additional documentation about the agent.
+   *
+   * @param string $documentationUrl
+   */
+  public function setDocumentationUrl($documentationUrl)
+  {
+    $this->documentationUrl = $documentationUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getDocumentationUrl()
+  {
+    return $this->documentationUrl;
+  }
+  /**
+   * An optional URL to an icon for the agent.
+   *
+   * @param string $iconUrl
+   */
+  public function setIconUrl($iconUrl)
+  {
+    $this->iconUrl = $iconUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getIconUrl()
+  {
+    return $this->iconUrl;
+  }
+  /**
+   * A human readable name for the agent. Example: "Recipe Agent"
+   *
+   * @param string $name
+   */
+  public function setName($name)
+  {
+    $this->name = $name;
+  }
+  /**
+   * @return string
+   */
+  public function getName()
+  {
+    return $this->name;
+  }
+  /**
+   * The transport of the preferred endpoint. If empty, defaults to JSONRPC.
+   *
+   * @param string $preferredTransport
+   */
+  public function setPreferredTransport($preferredTransport)
+  {
+    $this->preferredTransport = $preferredTransport;
+  }
+  /**
+   * @return string
+   */
+  public function getPreferredTransport()
+  {
+    return $this->preferredTransport;
+  }
+  /**
+   * The version of the A2A protocol this agent supports.
+   *
+   * @param string $protocolVersion
+   */
+  public function setProtocolVersion($protocolVersion)
+  {
+    $this->protocolVersion = $protocolVersion;
+  }
+  /**
+   * @return string
+   */
+  public function getProtocolVersion()
+  {
+    return $this->protocolVersion;
+  }
+  /**
+   * The service provider of the agent.
+   *
+   * @param A2aV1AgentProvider $provider
+   */
+  public function setProvider(A2aV1AgentProvider $provider)
+  {
+    $this->provider = $provider;
+  }
+  /**
+   * @return A2aV1AgentProvider
+   */
+  public function getProvider()
+  {
+    return $this->provider;
+  }
+  /**
+   * protolint:disable REPEATED_FIELD_NAMES_PLURALIZED Security requirements for
+   * contacting the agent. This list can be seen as an OR of ANDs. Each object
+   * in the list describes one possible set of security requirements that must
+   * be present on a request. This allows specifying, for example, "callers must
+   * either use OAuth OR an API Key AND mTLS." Example: security { schemes {
+   * key: "oauth" value { list: ["read"] } } } security { schemes { key: "api-
+   * key" } schemes { key: "mtls" } }
+   *
+   * @param A2aV1Security[] $security
+   */
+  public function setSecurity($security)
+  {
+    $this->security = $security;
+  }
+  /**
+   * @return A2aV1Security[]
+   */
+  public function getSecurity()
+  {
+    return $this->security;
+  }
+  /**
+   * The security scheme details used for authenticating with this agent.
+   *
+   * @param A2aV1SecurityScheme[] $securitySchemes
+   */
+  public function setSecuritySchemes($securitySchemes)
+  {
+    $this->securitySchemes = $securitySchemes;
+  }
+  /**
+   * @return A2aV1SecurityScheme[]
+   */
+  public function getSecuritySchemes()
+  {
+    return $this->securitySchemes;
+  }
+  /**
+   * JSON Web Signatures computed for this AgentCard.
+   *
+   * @param A2aV1AgentCardSignature[] $signatures
+   */
+  public function setSignatures($signatures)
+  {
+    $this->signatures = $signatures;
+  }
+  /**
+   * @return A2aV1AgentCardSignature[]
+   */
+  public function getSignatures()
+  {
+    return $this->signatures;
+  }
+  /**
+   * Skills represent a unit of ability an agent can perform. This may somewhat
+   * abstract but represents a more focused set of actions that the agent is
+   * highly likely to succeed at.
+   *
+   * @param A2aV1AgentSkill[] $skills
+   */
+  public function setSkills($skills)
+  {
+    $this->skills = $skills;
+  }
+  /**
+   * @return A2aV1AgentSkill[]
+   */
+  public function getSkills()
+  {
+    return $this->skills;
+  }
+  /**
+   * Whether the agent supports providing an extended agent card when the user
+   * is authenticated, i.e. is the card from .well-known different than the card
+   * from GetAgentCard.
+   *
+   * @param bool $supportsAuthenticatedExtendedCard
+   */
+  public function setSupportsAuthenticatedExtendedCard($supportsAuthenticatedExtendedCard)
+  {
+    $this->supportsAuthenticatedExtendedCard = $supportsAuthenticatedExtendedCard;
+  }
+  /**
+   * @return bool
+   */
+  public function getSupportsAuthenticatedExtendedCard()
+  {
+    return $this->supportsAuthenticatedExtendedCard;
+  }
+  /**
+   * A URL to the address the agent is hosted at. This represents the preferred
+   * endpoint as declared by the agent.
+   *
+   * @param string $url
+   */
+  public function setUrl($url)
+  {
+    $this->url = $url;
+  }
+  /**
+   * @return string
+   */
+  public function getUrl()
+  {
+    return $this->url;
+  }
+  /**
+   * The version of the agent. Example: "1.0.0"
+   *
+   * @param string $version
+   */
+  public function setVersion($version)
+  {
+    $this->version = $version;
+  }
+  /**
+   * @return string
+   */
+  public function getVersion()
+  {
+    return $this->version;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentCard::class, 'Google_Service_DiscoveryEngine_A2aV1AgentCard');
diff --git a/src/DiscoveryEngine/A2aV1AgentCardSignature.php b/src/DiscoveryEngine/A2aV1AgentCardSignature.php
new file mode 100644
index 0000000000..c6f827321b
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentCardSignature.php
@@ -0,0 +1,94 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentCardSignature extends \Google\Model
+{
+  /**
+   * The unprotected JWS header values.
+   *
+   * @var array[]
+   */
+  public $header;
+  /**
+   * Required. The protected JWS header for the signature. This is always a
+   * base64url-encoded JSON object. Required.
+   *
+   * @var string
+   */
+  public $protected;
+  /**
+   * Required. The computed signature, base64url-encoded. Required.
+   *
+   * @var string
+   */
+  public $signature;
+
+  /**
+   * The unprotected JWS header values.
+   *
+   * @param array[] $header
+   */
+  public function setHeader($header)
+  {
+    $this->header = $header;
+  }
+  /**
+   * @return array[]
+   */
+  public function getHeader()
+  {
+    return $this->header;
+  }
+  /**
+   * Required. The protected JWS header for the signature. This is always a
+   * base64url-encoded JSON object. Required.
+   *
+   * @param string $protected
+   */
+  public function setProtected($protected)
+  {
+    $this->protected = $protected;
+  }
+  /**
+   * @return string
+   */
+  public function getProtected()
+  {
+    return $this->protected;
+  }
+  /**
+   * Required. The computed signature, base64url-encoded. Required.
+   *
+   * @param string $signature
+   */
+  public function setSignature($signature)
+  {
+    $this->signature = $signature;
+  }
+  /**
+   * @return string
+   */
+  public function getSignature()
+  {
+    return $this->signature;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentCardSignature::class, 'Google_Service_DiscoveryEngine_A2aV1AgentCardSignature');
diff --git a/src/DiscoveryEngine/A2aV1AgentExtension.php b/src/DiscoveryEngine/A2aV1AgentExtension.php
new file mode 100644
index 0000000000..a35058c33c
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentExtension.php
@@ -0,0 +1,120 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentExtension extends \Google\Model
+{
+  /**
+   * A description of how this agent uses this extension. Example: "Google OAuth
+   * 2.0 authentication"
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * Optional configuration for the extension.
+   *
+   * @var array[]
+   */
+  public $params;
+  /**
+   * Whether the client must follow specific requirements of the extension.
+   * Example: false
+   *
+   * @var bool
+   */
+  public $required;
+  /**
+   * The URI of the extension. Example:
+   * "https://developers.google.com/identity/protocols/oauth2"
+   *
+   * @var string
+   */
+  public $uri;
+
+  /**
+   * A description of how this agent uses this extension. Example: "Google OAuth
+   * 2.0 authentication"
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * Optional configuration for the extension.
+   *
+   * @param array[] $params
+   */
+  public function setParams($params)
+  {
+    $this->params = $params;
+  }
+  /**
+   * @return array[]
+   */
+  public function getParams()
+  {
+    return $this->params;
+  }
+  /**
+   * Whether the client must follow specific requirements of the extension.
+   * Example: false
+   *
+   * @param bool $required
+   */
+  public function setRequired($required)
+  {
+    $this->required = $required;
+  }
+  /**
+   * @return bool
+   */
+  public function getRequired()
+  {
+    return $this->required;
+  }
+  /**
+   * The URI of the extension. Example:
+   * "https://developers.google.com/identity/protocols/oauth2"
+   *
+   * @param string $uri
+   */
+  public function setUri($uri)
+  {
+    $this->uri = $uri;
+  }
+  /**
+   * @return string
+   */
+  public function getUri()
+  {
+    return $this->uri;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentExtension::class, 'Google_Service_DiscoveryEngine_A2aV1AgentExtension');
diff --git a/src/DiscoveryEngine/A2aV1AgentInterface.php b/src/DiscoveryEngine/A2aV1AgentInterface.php
new file mode 100644
index 0000000000..e099107f2a
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentInterface.php
@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentInterface extends \Google\Model
+{
+  /**
+   * Tenant to be set in the request when calling the agent. Experimental, might
+   * still change for 1.0 release.
+   *
+   * @var string
+   */
+  public $tenant;
+  /**
+   * The transport supported this url. This is an open form string, to be easily
+   * extended for many transport protocols. The core ones officially supported
+   * are JSONRPC, GRPC and HTTP+JSON.
+   *
+   * @var string
+   */
+  public $transport;
+  /**
+   * The url this interface is found at.
+   *
+   * @var string
+   */
+  public $url;
+
+  /**
+   * Tenant to be set in the request when calling the agent. Experimental, might
+   * still change for 1.0 release.
+   *
+   * @param string $tenant
+   */
+  public function setTenant($tenant)
+  {
+    $this->tenant = $tenant;
+  }
+  /**
+   * @return string
+   */
+  public function getTenant()
+  {
+    return $this->tenant;
+  }
+  /**
+   * The transport supported this url. This is an open form string, to be easily
+   * extended for many transport protocols. The core ones officially supported
+   * are JSONRPC, GRPC and HTTP+JSON.
+   *
+   * @param string $transport
+   */
+  public function setTransport($transport)
+  {
+    $this->transport = $transport;
+  }
+  /**
+   * @return string
+   */
+  public function getTransport()
+  {
+    return $this->transport;
+  }
+  /**
+   * The url this interface is found at.
+   *
+   * @param string $url
+   */
+  public function setUrl($url)
+  {
+    $this->url = $url;
+  }
+  /**
+   * @return string
+   */
+  public function getUrl()
+  {
+    return $this->url;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentInterface::class, 'Google_Service_DiscoveryEngine_A2aV1AgentInterface');
diff --git a/src/DiscoveryEngine/A2aV1AgentProvider.php b/src/DiscoveryEngine/A2aV1AgentProvider.php
new file mode 100644
index 0000000000..357f9539fa
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentProvider.php
@@ -0,0 +1,70 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentProvider extends \Google\Model
+{
+  /**
+   * The providers organization name Example: "Google"
+   *
+   * @var string
+   */
+  public $organization;
+  /**
+   * The providers reference url Example: "https://ai.google.dev"
+   *
+   * @var string
+   */
+  public $url;
+
+  /**
+   * The providers organization name Example: "Google"
+   *
+   * @param string $organization
+   */
+  public function setOrganization($organization)
+  {
+    $this->organization = $organization;
+  }
+  /**
+   * @return string
+   */
+  public function getOrganization()
+  {
+    return $this->organization;
+  }
+  /**
+   * The providers reference url Example: "https://ai.google.dev"
+   *
+   * @param string $url
+   */
+  public function setUrl($url)
+  {
+    $this->url = $url;
+  }
+  /**
+   * @return string
+   */
+  public function getUrl()
+  {
+    return $this->url;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentProvider::class, 'Google_Service_DiscoveryEngine_A2aV1AgentProvider');
diff --git a/src/DiscoveryEngine/A2aV1AgentSkill.php b/src/DiscoveryEngine/A2aV1AgentSkill.php
new file mode 100644
index 0000000000..3312ad4939
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AgentSkill.php
@@ -0,0 +1,210 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AgentSkill extends \Google\Collection
+{
+  protected $collection_key = 'tags';
+  /**
+   * A human (or llm) readable description of the skill details and behaviors.
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * A set of example queries that this skill is designed to address. These
+   * examples should help the caller to understand how to craft requests to the
+   * agent to achieve specific goals. Example: ["I need a recipe for bread"]
+   *
+   * @var string[]
+   */
+  public $examples;
+  /**
+   * Unique identifier of the skill within this agent.
+   *
+   * @var string
+   */
+  public $id;
+  /**
+   * Possible input modalities supported.
+   *
+   * @var string[]
+   */
+  public $inputModes;
+  /**
+   * A human readable name for the skill.
+   *
+   * @var string
+   */
+  public $name;
+  /**
+   * Possible output modalities produced
+   *
+   * @var string[]
+   */
+  public $outputModes;
+  protected $securityType = A2aV1Security::class;
+  protected $securityDataType = 'array';
+  /**
+   * A set of tags for the skill to enhance categorization/utilization. Example:
+   * ["cooking", "customer support", "billing"]
+   *
+   * @var string[]
+   */
+  public $tags;
+
+  /**
+   * A human (or llm) readable description of the skill details and behaviors.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * A set of example queries that this skill is designed to address. These
+   * examples should help the caller to understand how to craft requests to the
+   * agent to achieve specific goals. Example: ["I need a recipe for bread"]
+   *
+   * @param string[] $examples
+   */
+  public function setExamples($examples)
+  {
+    $this->examples = $examples;
+  }
+  /**
+   * @return string[]
+   */
+  public function getExamples()
+  {
+    return $this->examples;
+  }
+  /**
+   * Unique identifier of the skill within this agent.
+   *
+   * @param string $id
+   */
+  public function setId($id)
+  {
+    $this->id = $id;
+  }
+  /**
+   * @return string
+   */
+  public function getId()
+  {
+    return $this->id;
+  }
+  /**
+   * Possible input modalities supported.
+   *
+   * @param string[] $inputModes
+   */
+  public function setInputModes($inputModes)
+  {
+    $this->inputModes = $inputModes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getInputModes()
+  {
+    return $this->inputModes;
+  }
+  /**
+   * A human readable name for the skill.
+   *
+   * @param string $name
+   */
+  public function setName($name)
+  {
+    $this->name = $name;
+  }
+  /**
+   * @return string
+   */
+  public function getName()
+  {
+    return $this->name;
+  }
+  /**
+   * Possible output modalities produced
+   *
+   * @param string[] $outputModes
+   */
+  public function setOutputModes($outputModes)
+  {
+    $this->outputModes = $outputModes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getOutputModes()
+  {
+    return $this->outputModes;
+  }
+  /**
+   * protolint:disable REPEATED_FIELD_NAMES_PLURALIZED Security schemes
+   * necessary for the agent to leverage this skill. As in the overall
+   * AgentCard.security, this list represents a logical OR of security
+   * requirement objects. Each object is a set of security schemes that must be
+   * used together (a logical AND). protolint:enable
+   * REPEATED_FIELD_NAMES_PLURALIZED
+   *
+   * @param A2aV1Security[] $security
+   */
+  public function setSecurity($security)
+  {
+    $this->security = $security;
+  }
+  /**
+   * @return A2aV1Security[]
+   */
+  public function getSecurity()
+  {
+    return $this->security;
+  }
+  /**
+   * A set of tags for the skill to enhance categorization/utilization. Example:
+   * ["cooking", "customer support", "billing"]
+   *
+   * @param string[] $tags
+   */
+  public function setTags($tags)
+  {
+    $this->tags = $tags;
+  }
+  /**
+   * @return string[]
+   */
+  public function getTags()
+  {
+    return $this->tags;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AgentSkill::class, 'Google_Service_DiscoveryEngine_A2aV1AgentSkill');
diff --git a/src/DiscoveryEngine/A2aV1Artifact.php b/src/DiscoveryEngine/A2aV1Artifact.php
new file mode 100644
index 0000000000..6b73856a89
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1Artifact.php
@@ -0,0 +1,157 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1Artifact extends \Google\Collection
+{
+  protected $collection_key = 'parts';
+  /**
+   * Unique identifier (e.g. UUID) for the artifact. It must be at least unique
+   * within a task.
+   *
+   * @var string
+   */
+  public $artifactId;
+  /**
+   * A human readable description of the artifact, optional.
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * The URIs of extensions that are present or contributed to this Artifact.
+   *
+   * @var string[]
+   */
+  public $extensions;
+  /**
+   * Optional metadata included with the artifact.
+   *
+   * @var array[]
+   */
+  public $metadata;
+  /**
+   * A human readable name for the artifact.
+   *
+   * @var string
+   */
+  public $name;
+  protected $partsType = A2aV1Part::class;
+  protected $partsDataType = 'array';
+
+  /**
+   * Unique identifier (e.g. UUID) for the artifact. It must be at least unique
+   * within a task.
+   *
+   * @param string $artifactId
+   */
+  public function setArtifactId($artifactId)
+  {
+    $this->artifactId = $artifactId;
+  }
+  /**
+   * @return string
+   */
+  public function getArtifactId()
+  {
+    return $this->artifactId;
+  }
+  /**
+   * A human readable description of the artifact, optional.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * The URIs of extensions that are present or contributed to this Artifact.
+   *
+   * @param string[] $extensions
+   */
+  public function setExtensions($extensions)
+  {
+    $this->extensions = $extensions;
+  }
+  /**
+   * @return string[]
+   */
+  public function getExtensions()
+  {
+    return $this->extensions;
+  }
+  /**
+   * Optional metadata included with the artifact.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+  /**
+   * A human readable name for the artifact.
+   *
+   * @param string $name
+   */
+  public function setName($name)
+  {
+    $this->name = $name;
+  }
+  /**
+   * @return string
+   */
+  public function getName()
+  {
+    return $this->name;
+  }
+  /**
+   * The content of the artifact.
+   *
+   * @param A2aV1Part[] $parts
+   */
+  public function setParts($parts)
+  {
+    $this->parts = $parts;
+  }
+  /**
+   * @return A2aV1Part[]
+   */
+  public function getParts()
+  {
+    return $this->parts;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1Artifact::class, 'Google_Service_DiscoveryEngine_A2aV1Artifact');
diff --git a/src/DiscoveryEngine/A2aV1AuthenticationInfo.php b/src/DiscoveryEngine/A2aV1AuthenticationInfo.php
new file mode 100644
index 0000000000..70efb39517
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AuthenticationInfo.php
@@ -0,0 +1,71 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AuthenticationInfo extends \Google\Collection
+{
+  protected $collection_key = 'schemes';
+  /**
+   * Optional credentials
+   *
+   * @var string
+   */
+  public $credentials;
+  /**
+   * Supported authentication schemes - e.g. Basic, Bearer, etc
+   *
+   * @var string[]
+   */
+  public $schemes;
+
+  /**
+   * Optional credentials
+   *
+   * @param string $credentials
+   */
+  public function setCredentials($credentials)
+  {
+    $this->credentials = $credentials;
+  }
+  /**
+   * @return string
+   */
+  public function getCredentials()
+  {
+    return $this->credentials;
+  }
+  /**
+   * Supported authentication schemes - e.g. Basic, Bearer, etc
+   *
+   * @param string[] $schemes
+   */
+  public function setSchemes($schemes)
+  {
+    $this->schemes = $schemes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getSchemes()
+  {
+    return $this->schemes;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AuthenticationInfo::class, 'Google_Service_DiscoveryEngine_A2aV1AuthenticationInfo');
diff --git a/src/DiscoveryEngine/A2aV1AuthorizationCodeOAuthFlow.php b/src/DiscoveryEngine/A2aV1AuthorizationCodeOAuthFlow.php
new file mode 100644
index 0000000000..84d02ee938
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1AuthorizationCodeOAuthFlow.php
@@ -0,0 +1,122 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1AuthorizationCodeOAuthFlow extends \Google\Model
+{
+  /**
+   * The authorization URL to be used for this flow. This MUST be in the form of
+   * a URL. The OAuth2 standard requires the use of TLS
+   *
+   * @var string
+   */
+  public $authorizationUrl;
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $refreshUrl;
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @var string[]
+   */
+  public $scopes;
+  /**
+   * The token URL to be used for this flow. This MUST be in the form of a URL.
+   * The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $tokenUrl;
+
+  /**
+   * The authorization URL to be used for this flow. This MUST be in the form of
+   * a URL. The OAuth2 standard requires the use of TLS
+   *
+   * @param string $authorizationUrl
+   */
+  public function setAuthorizationUrl($authorizationUrl)
+  {
+    $this->authorizationUrl = $authorizationUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getAuthorizationUrl()
+  {
+    return $this->authorizationUrl;
+  }
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $refreshUrl
+   */
+  public function setRefreshUrl($refreshUrl)
+  {
+    $this->refreshUrl = $refreshUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getRefreshUrl()
+  {
+    return $this->refreshUrl;
+  }
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @param string[] $scopes
+   */
+  public function setScopes($scopes)
+  {
+    $this->scopes = $scopes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getScopes()
+  {
+    return $this->scopes;
+  }
+  /**
+   * The token URL to be used for this flow. This MUST be in the form of a URL.
+   * The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $tokenUrl
+   */
+  public function setTokenUrl($tokenUrl)
+  {
+    $this->tokenUrl = $tokenUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getTokenUrl()
+  {
+    return $this->tokenUrl;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1AuthorizationCodeOAuthFlow::class, 'Google_Service_DiscoveryEngine_A2aV1AuthorizationCodeOAuthFlow');
diff --git a/src/DiscoveryEngine/A2aV1CancelTaskRequest.php b/src/DiscoveryEngine/A2aV1CancelTaskRequest.php
new file mode 100644
index 0000000000..7047c8b176
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1CancelTaskRequest.php
@@ -0,0 +1,25 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1CancelTaskRequest extends \Google\Model
+{
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1CancelTaskRequest::class, 'Google_Service_DiscoveryEngine_A2aV1CancelTaskRequest');
diff --git a/src/DiscoveryEngine/A2aV1ClientCredentialsOAuthFlow.php b/src/DiscoveryEngine/A2aV1ClientCredentialsOAuthFlow.php
new file mode 100644
index 0000000000..6c0371e023
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1ClientCredentialsOAuthFlow.php
@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1ClientCredentialsOAuthFlow extends \Google\Model
+{
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $refreshUrl;
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @var string[]
+   */
+  public $scopes;
+  /**
+   * The token URL to be used for this flow. This MUST be in the form of a URL.
+   * The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $tokenUrl;
+
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $refreshUrl
+   */
+  public function setRefreshUrl($refreshUrl)
+  {
+    $this->refreshUrl = $refreshUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getRefreshUrl()
+  {
+    return $this->refreshUrl;
+  }
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @param string[] $scopes
+   */
+  public function setScopes($scopes)
+  {
+    $this->scopes = $scopes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getScopes()
+  {
+    return $this->scopes;
+  }
+  /**
+   * The token URL to be used for this flow. This MUST be in the form of a URL.
+   * The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $tokenUrl
+   */
+  public function setTokenUrl($tokenUrl)
+  {
+    $this->tokenUrl = $tokenUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getTokenUrl()
+  {
+    return $this->tokenUrl;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1ClientCredentialsOAuthFlow::class, 'Google_Service_DiscoveryEngine_A2aV1ClientCredentialsOAuthFlow');
diff --git a/src/DiscoveryEngine/A2aV1DataPart.php b/src/DiscoveryEngine/A2aV1DataPart.php
new file mode 100644
index 0000000000..7d1e1b180c
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1DataPart.php
@@ -0,0 +1,44 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1DataPart extends \Google\Model
+{
+  /**
+   * @var array[]
+   */
+  public $data;
+
+  /**
+   * @param array[] $data
+   */
+  public function setData($data)
+  {
+    $this->data = $data;
+  }
+  /**
+   * @return array[]
+   */
+  public function getData()
+  {
+    return $this->data;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1DataPart::class, 'Google_Service_DiscoveryEngine_A2aV1DataPart');
diff --git a/src/DiscoveryEngine/A2aV1FilePart.php b/src/DiscoveryEngine/A2aV1FilePart.php
new file mode 100644
index 0000000000..f6531319f1
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1FilePart.php
@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1FilePart extends \Google\Model
+{
+  /**
+   * @var string
+   */
+  public $fileWithBytes;
+  /**
+   * @var string
+   */
+  public $fileWithUri;
+  /**
+   * @var string
+   */
+  public $mimeType;
+  /**
+   * @var string
+   */
+  public $name;
+
+  /**
+   * @param string $fileWithBytes
+   */
+  public function setFileWithBytes($fileWithBytes)
+  {
+    $this->fileWithBytes = $fileWithBytes;
+  }
+  /**
+   * @return string
+   */
+  public function getFileWithBytes()
+  {
+    return $this->fileWithBytes;
+  }
+  /**
+   * @param string $fileWithUri
+   */
+  public function setFileWithUri($fileWithUri)
+  {
+    $this->fileWithUri = $fileWithUri;
+  }
+  /**
+   * @return string
+   */
+  public function getFileWithUri()
+  {
+    return $this->fileWithUri;
+  }
+  /**
+   * @param string $mimeType
+   */
+  public function setMimeType($mimeType)
+  {
+    $this->mimeType = $mimeType;
+  }
+  /**
+   * @return string
+   */
+  public function getMimeType()
+  {
+    return $this->mimeType;
+  }
+  /**
+   * @param string $name
+   */
+  public function setName($name)
+  {
+    $this->name = $name;
+  }
+  /**
+   * @return string
+   */
+  public function getName()
+  {
+    return $this->name;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1FilePart::class, 'Google_Service_DiscoveryEngine_A2aV1FilePart');
diff --git a/src/DiscoveryEngine/A2aV1HTTPAuthSecurityScheme.php b/src/DiscoveryEngine/A2aV1HTTPAuthSecurityScheme.php
new file mode 100644
index 0000000000..144406aaba
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1HTTPAuthSecurityScheme.php
@@ -0,0 +1,102 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1HTTPAuthSecurityScheme extends \Google\Model
+{
+  /**
+   * A hint to the client to identify how the bearer token is formatted. Bearer
+   * tokens are usually generated by an authorization server, so this
+   * information is primarily for documentation purposes.
+   *
+   * @var string
+   */
+  public $bearerFormat;
+  /**
+   * Description of this security scheme.
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * The name of the HTTP Authentication scheme to be used in the Authorization
+   * header as defined in RFC7235. The values used SHOULD be registered in the
+   * IANA Authentication Scheme registry. The value is case-insensitive, as
+   * defined in RFC7235.
+   *
+   * @var string
+   */
+  public $scheme;
+
+  /**
+   * A hint to the client to identify how the bearer token is formatted. Bearer
+   * tokens are usually generated by an authorization server, so this
+   * information is primarily for documentation purposes.
+   *
+   * @param string $bearerFormat
+   */
+  public function setBearerFormat($bearerFormat)
+  {
+    $this->bearerFormat = $bearerFormat;
+  }
+  /**
+   * @return string
+   */
+  public function getBearerFormat()
+  {
+    return $this->bearerFormat;
+  }
+  /**
+   * Description of this security scheme.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * The name of the HTTP Authentication scheme to be used in the Authorization
+   * header as defined in RFC7235. The values used SHOULD be registered in the
+   * IANA Authentication Scheme registry. The value is case-insensitive, as
+   * defined in RFC7235.
+   *
+   * @param string $scheme
+   */
+  public function setScheme($scheme)
+  {
+    $this->scheme = $scheme;
+  }
+  /**
+   * @return string
+   */
+  public function getScheme()
+  {
+    return $this->scheme;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1HTTPAuthSecurityScheme::class, 'Google_Service_DiscoveryEngine_A2aV1HTTPAuthSecurityScheme');
diff --git a/src/DiscoveryEngine/A2aV1ImplicitOAuthFlow.php b/src/DiscoveryEngine/A2aV1ImplicitOAuthFlow.php
new file mode 100644
index 0000000000..1c3b9b335d
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1ImplicitOAuthFlow.php
@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1ImplicitOAuthFlow extends \Google\Model
+{
+  /**
+   * The authorization URL to be used for this flow. This MUST be in the form of
+   * a URL. The OAuth2 standard requires the use of TLS
+   *
+   * @var string
+   */
+  public $authorizationUrl;
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $refreshUrl;
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @var string[]
+   */
+  public $scopes;
+
+  /**
+   * The authorization URL to be used for this flow. This MUST be in the form of
+   * a URL. The OAuth2 standard requires the use of TLS
+   *
+   * @param string $authorizationUrl
+   */
+  public function setAuthorizationUrl($authorizationUrl)
+  {
+    $this->authorizationUrl = $authorizationUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getAuthorizationUrl()
+  {
+    return $this->authorizationUrl;
+  }
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $refreshUrl
+   */
+  public function setRefreshUrl($refreshUrl)
+  {
+    $this->refreshUrl = $refreshUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getRefreshUrl()
+  {
+    return $this->refreshUrl;
+  }
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @param string[] $scopes
+   */
+  public function setScopes($scopes)
+  {
+    $this->scopes = $scopes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getScopes()
+  {
+    return $this->scopes;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1ImplicitOAuthFlow::class, 'Google_Service_DiscoveryEngine_A2aV1ImplicitOAuthFlow');
diff --git a/src/DiscoveryEngine/A2aV1ListTaskPushNotificationConfigResponse.php b/src/DiscoveryEngine/A2aV1ListTaskPushNotificationConfigResponse.php
new file mode 100644
index 0000000000..86d177f391
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1ListTaskPushNotificationConfigResponse.php
@@ -0,0 +1,69 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1ListTaskPushNotificationConfigResponse extends \Google\Collection
+{
+  protected $collection_key = 'configs';
+  protected $configsType = A2aV1TaskPushNotificationConfig::class;
+  protected $configsDataType = 'array';
+  /**
+   * A token, which can be sent as `page_token` to retrieve the next page. If
+   * this field is omitted, there are no subsequent pages.
+   *
+   * @var string
+   */
+  public $nextPageToken;
+
+  /**
+   * The list of push notification configurations.
+   *
+   * @param A2aV1TaskPushNotificationConfig[] $configs
+   */
+  public function setConfigs($configs)
+  {
+    $this->configs = $configs;
+  }
+  /**
+   * @return A2aV1TaskPushNotificationConfig[]
+   */
+  public function getConfigs()
+  {
+    return $this->configs;
+  }
+  /**
+   * A token, which can be sent as `page_token` to retrieve the next page. If
+   * this field is omitted, there are no subsequent pages.
+   *
+   * @param string $nextPageToken
+   */
+  public function setNextPageToken($nextPageToken)
+  {
+    $this->nextPageToken = $nextPageToken;
+  }
+  /**
+   * @return string
+   */
+  public function getNextPageToken()
+  {
+    return $this->nextPageToken;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1ListTaskPushNotificationConfigResponse::class, 'Google_Service_DiscoveryEngine_A2aV1ListTaskPushNotificationConfigResponse');
diff --git a/src/DiscoveryEngine/A2aV1Message.php b/src/DiscoveryEngine/A2aV1Message.php
new file mode 100644
index 0000000000..c85d738ada
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1Message.php
@@ -0,0 +1,197 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1Message extends \Google\Collection
+{
+  public const ROLE_ROLE_UNSPECIFIED = 'ROLE_UNSPECIFIED';
+  /**
+   * USER role refers to communication from the client to the server.
+   */
+  public const ROLE_ROLE_USER = 'ROLE_USER';
+  /**
+   * AGENT role refers to communication from the server to the client.
+   */
+  public const ROLE_ROLE_AGENT = 'ROLE_AGENT';
+  protected $collection_key = 'extensions';
+  protected $contentType = A2aV1Part::class;
+  protected $contentDataType = 'array';
+  /**
+   * The context id of the message. This is optional and if set, the message
+   * will be associated with the given context.
+   *
+   * @var string
+   */
+  public $contextId;
+  /**
+   * The URIs of extensions that are present or contributed to this Message.
+   *
+   * @var string[]
+   */
+  public $extensions;
+  /**
+   * The unique identifier (e.g. UUID)of the message. This is required and
+   * created by the message creator.
+   *
+   * @var string
+   */
+  public $messageId;
+  /**
+   * protolint:enable REPEATED_FIELD_NAMES_PLURALIZED Any optional metadata to
+   * provide along with the message.
+   *
+   * @var array[]
+   */
+  public $metadata;
+  /**
+   * A role for the message.
+   *
+   * @var string
+   */
+  public $role;
+  /**
+   * The task id of the message. This is optional and if set, the message will
+   * be associated with the given task.
+   *
+   * @var string
+   */
+  public $taskId;
+
+  /**
+   * protolint:disable REPEATED_FIELD_NAMES_PLURALIZED Content is the container
+   * of the message content.
+   *
+   * @param A2aV1Part[] $content
+   */
+  public function setContent($content)
+  {
+    $this->content = $content;
+  }
+  /**
+   * @return A2aV1Part[]
+   */
+  public function getContent()
+  {
+    return $this->content;
+  }
+  /**
+   * The context id of the message. This is optional and if set, the message
+   * will be associated with the given context.
+   *
+   * @param string $contextId
+   */
+  public function setContextId($contextId)
+  {
+    $this->contextId = $contextId;
+  }
+  /**
+   * @return string
+   */
+  public function getContextId()
+  {
+    return $this->contextId;
+  }
+  /**
+   * The URIs of extensions that are present or contributed to this Message.
+   *
+   * @param string[] $extensions
+   */
+  public function setExtensions($extensions)
+  {
+    $this->extensions = $extensions;
+  }
+  /**
+   * @return string[]
+   */
+  public function getExtensions()
+  {
+    return $this->extensions;
+  }
+  /**
+   * The unique identifier (e.g. UUID)of the message. This is required and
+   * created by the message creator.
+   *
+   * @param string $messageId
+   */
+  public function setMessageId($messageId)
+  {
+    $this->messageId = $messageId;
+  }
+  /**
+   * @return string
+   */
+  public function getMessageId()
+  {
+    return $this->messageId;
+  }
+  /**
+   * protolint:enable REPEATED_FIELD_NAMES_PLURALIZED Any optional metadata to
+   * provide along with the message.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+  /**
+   * A role for the message.
+   *
+   * Accepted values: ROLE_UNSPECIFIED, ROLE_USER, ROLE_AGENT
+   *
+   * @param self::ROLE_* $role
+   */
+  public function setRole($role)
+  {
+    $this->role = $role;
+  }
+  /**
+   * @return self::ROLE_*
+   */
+  public function getRole()
+  {
+    return $this->role;
+  }
+  /**
+   * The task id of the message. This is optional and if set, the message will
+   * be associated with the given task.
+   *
+   * @param string $taskId
+   */
+  public function setTaskId($taskId)
+  {
+    $this->taskId = $taskId;
+  }
+  /**
+   * @return string
+   */
+  public function getTaskId()
+  {
+    return $this->taskId;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1Message::class, 'Google_Service_DiscoveryEngine_A2aV1Message');
diff --git a/src/DiscoveryEngine/A2aV1MutualTlsSecurityScheme.php b/src/DiscoveryEngine/A2aV1MutualTlsSecurityScheme.php
new file mode 100644
index 0000000000..626fdfd6af
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1MutualTlsSecurityScheme.php
@@ -0,0 +1,48 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1MutualTlsSecurityScheme extends \Google\Model
+{
+  /**
+   * Description of this security scheme.
+   *
+   * @var string
+   */
+  public $description;
+
+  /**
+   * Description of this security scheme.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1MutualTlsSecurityScheme::class, 'Google_Service_DiscoveryEngine_A2aV1MutualTlsSecurityScheme');
diff --git a/src/DiscoveryEngine/A2aV1OAuth2SecurityScheme.php b/src/DiscoveryEngine/A2aV1OAuth2SecurityScheme.php
new file mode 100644
index 0000000000..6feafc96b4
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1OAuth2SecurityScheme.php
@@ -0,0 +1,90 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1OAuth2SecurityScheme extends \Google\Model
+{
+  /**
+   * Description of this security scheme.
+   *
+   * @var string
+   */
+  public $description;
+  protected $flowsType = A2aV1OAuthFlows::class;
+  protected $flowsDataType = '';
+  /**
+   * URL to the oauth2 authorization server metadata
+   * [RFC8414](https://datatracker.ietf.org/doc/html/rfc8414). TLS is required.
+   *
+   * @var string
+   */
+  public $oauth2MetadataUrl;
+
+  /**
+   * Description of this security scheme.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * An object containing configuration information for the flow types supported
+   *
+   * @param A2aV1OAuthFlows $flows
+   */
+  public function setFlows(A2aV1OAuthFlows $flows)
+  {
+    $this->flows = $flows;
+  }
+  /**
+   * @return A2aV1OAuthFlows
+   */
+  public function getFlows()
+  {
+    return $this->flows;
+  }
+  /**
+   * URL to the oauth2 authorization server metadata
+   * [RFC8414](https://datatracker.ietf.org/doc/html/rfc8414). TLS is required.
+   *
+   * @param string $oauth2MetadataUrl
+   */
+  public function setOauth2MetadataUrl($oauth2MetadataUrl)
+  {
+    $this->oauth2MetadataUrl = $oauth2MetadataUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getOauth2MetadataUrl()
+  {
+    return $this->oauth2MetadataUrl;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1OAuth2SecurityScheme::class, 'Google_Service_DiscoveryEngine_A2aV1OAuth2SecurityScheme');
diff --git a/src/DiscoveryEngine/A2aV1OAuthFlows.php b/src/DiscoveryEngine/A2aV1OAuthFlows.php
new file mode 100644
index 0000000000..2da8ccdfbf
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1OAuthFlows.php
@@ -0,0 +1,90 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1OAuthFlows extends \Google\Model
+{
+  protected $authorizationCodeType = A2aV1AuthorizationCodeOAuthFlow::class;
+  protected $authorizationCodeDataType = '';
+  protected $clientCredentialsType = A2aV1ClientCredentialsOAuthFlow::class;
+  protected $clientCredentialsDataType = '';
+  protected $implicitType = A2aV1ImplicitOAuthFlow::class;
+  protected $implicitDataType = '';
+  protected $passwordType = A2aV1PasswordOAuthFlow::class;
+  protected $passwordDataType = '';
+
+  /**
+   * @param A2aV1AuthorizationCodeOAuthFlow $authorizationCode
+   */
+  public function setAuthorizationCode(A2aV1AuthorizationCodeOAuthFlow $authorizationCode)
+  {
+    $this->authorizationCode = $authorizationCode;
+  }
+  /**
+   * @return A2aV1AuthorizationCodeOAuthFlow
+   */
+  public function getAuthorizationCode()
+  {
+    return $this->authorizationCode;
+  }
+  /**
+   * @param A2aV1ClientCredentialsOAuthFlow $clientCredentials
+   */
+  public function setClientCredentials(A2aV1ClientCredentialsOAuthFlow $clientCredentials)
+  {
+    $this->clientCredentials = $clientCredentials;
+  }
+  /**
+   * @return A2aV1ClientCredentialsOAuthFlow
+   */
+  public function getClientCredentials()
+  {
+    return $this->clientCredentials;
+  }
+  /**
+   * @param A2aV1ImplicitOAuthFlow $implicit
+   */
+  public function setImplicit(A2aV1ImplicitOAuthFlow $implicit)
+  {
+    $this->implicit = $implicit;
+  }
+  /**
+   * @return A2aV1ImplicitOAuthFlow
+   */
+  public function getImplicit()
+  {
+    return $this->implicit;
+  }
+  /**
+   * @param A2aV1PasswordOAuthFlow $password
+   */
+  public function setPassword(A2aV1PasswordOAuthFlow $password)
+  {
+    $this->password = $password;
+  }
+  /**
+   * @return A2aV1PasswordOAuthFlow
+   */
+  public function getPassword()
+  {
+    return $this->password;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1OAuthFlows::class, 'Google_Service_DiscoveryEngine_A2aV1OAuthFlows');
diff --git a/src/DiscoveryEngine/A2aV1OpenIdConnectSecurityScheme.php b/src/DiscoveryEngine/A2aV1OpenIdConnectSecurityScheme.php
new file mode 100644
index 0000000000..32819ab73f
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1OpenIdConnectSecurityScheme.php
@@ -0,0 +1,72 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1OpenIdConnectSecurityScheme extends \Google\Model
+{
+  /**
+   * Description of this security scheme.
+   *
+   * @var string
+   */
+  public $description;
+  /**
+   * Well-known URL to discover the [[OpenID-Connect-Discovery]] provider
+   * metadata.
+   *
+   * @var string
+   */
+  public $openIdConnectUrl;
+
+  /**
+   * Description of this security scheme.
+   *
+   * @param string $description
+   */
+  public function setDescription($description)
+  {
+    $this->description = $description;
+  }
+  /**
+   * @return string
+   */
+  public function getDescription()
+  {
+    return $this->description;
+  }
+  /**
+   * Well-known URL to discover the [[OpenID-Connect-Discovery]] provider
+   * metadata.
+   *
+   * @param string $openIdConnectUrl
+   */
+  public function setOpenIdConnectUrl($openIdConnectUrl)
+  {
+    $this->openIdConnectUrl = $openIdConnectUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getOpenIdConnectUrl()
+  {
+    return $this->openIdConnectUrl;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1OpenIdConnectSecurityScheme::class, 'Google_Service_DiscoveryEngine_A2aV1OpenIdConnectSecurityScheme');
diff --git a/src/DiscoveryEngine/A2aV1Part.php b/src/DiscoveryEngine/A2aV1Part.php
new file mode 100644
index 0000000000..dc1fc31254
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1Part.php
@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1Part extends \Google\Model
+{
+  protected $dataType = A2aV1DataPart::class;
+  protected $dataDataType = '';
+  protected $fileType = A2aV1FilePart::class;
+  protected $fileDataType = '';
+  /**
+   * Optional metadata associated with this part.
+   *
+   * @var array[]
+   */
+  public $metadata;
+  /**
+   * @var string
+   */
+  public $text;
+
+  /**
+   * @param A2aV1DataPart $data
+   */
+  public function setData(A2aV1DataPart $data)
+  {
+    $this->data = $data;
+  }
+  /**
+   * @return A2aV1DataPart
+   */
+  public function getData()
+  {
+    return $this->data;
+  }
+  /**
+   * @param A2aV1FilePart $file
+   */
+  public function setFile(A2aV1FilePart $file)
+  {
+    $this->file = $file;
+  }
+  /**
+   * @return A2aV1FilePart
+   */
+  public function getFile()
+  {
+    return $this->file;
+  }
+  /**
+   * Optional metadata associated with this part.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+  /**
+   * @param string $text
+   */
+  public function setText($text)
+  {
+    $this->text = $text;
+  }
+  /**
+   * @return string
+   */
+  public function getText()
+  {
+    return $this->text;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1Part::class, 'Google_Service_DiscoveryEngine_A2aV1Part');
diff --git a/src/DiscoveryEngine/A2aV1PasswordOAuthFlow.php b/src/DiscoveryEngine/A2aV1PasswordOAuthFlow.php
new file mode 100644
index 0000000000..23caccf467
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1PasswordOAuthFlow.php
@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1PasswordOAuthFlow extends \Google\Model
+{
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $refreshUrl;
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @var string[]
+   */
+  public $scopes;
+  /**
+   * The token URL to be used for this flow. This MUST be in the form of a URL.
+   * The OAuth2 standard requires the use of TLS.
+   *
+   * @var string
+   */
+  public $tokenUrl;
+
+  /**
+   * The URL to be used for obtaining refresh tokens. This MUST be in the form
+   * of a URL. The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $refreshUrl
+   */
+  public function setRefreshUrl($refreshUrl)
+  {
+    $this->refreshUrl = $refreshUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getRefreshUrl()
+  {
+    return $this->refreshUrl;
+  }
+  /**
+   * The available scopes for the OAuth2 security scheme. A map between the
+   * scope name and a short description for it. The map MAY be empty.
+   *
+   * @param string[] $scopes
+   */
+  public function setScopes($scopes)
+  {
+    $this->scopes = $scopes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getScopes()
+  {
+    return $this->scopes;
+  }
+  /**
+   * The token URL to be used for this flow. This MUST be in the form of a URL.
+   * The OAuth2 standard requires the use of TLS.
+   *
+   * @param string $tokenUrl
+   */
+  public function setTokenUrl($tokenUrl)
+  {
+    $this->tokenUrl = $tokenUrl;
+  }
+  /**
+   * @return string
+   */
+  public function getTokenUrl()
+  {
+    return $this->tokenUrl;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1PasswordOAuthFlow::class, 'Google_Service_DiscoveryEngine_A2aV1PasswordOAuthFlow');
diff --git a/src/DiscoveryEngine/A2aV1PushNotificationConfig.php b/src/DiscoveryEngine/A2aV1PushNotificationConfig.php
new file mode 100644
index 0000000000..24982cc421
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1PushNotificationConfig.php
@@ -0,0 +1,110 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1PushNotificationConfig extends \Google\Model
+{
+  protected $authenticationType = A2aV1AuthenticationInfo::class;
+  protected $authenticationDataType = '';
+  /**
+   * A unique identifier (e.g. UUID) for this push notification.
+   *
+   * @var string
+   */
+  public $id;
+  /**
+   * Token unique for this task/session
+   *
+   * @var string
+   */
+  public $token;
+  /**
+   * Url to send the notification too
+   *
+   * @var string
+   */
+  public $url;
+
+  /**
+   * Information about the authentication to sent with the notification
+   *
+   * @param A2aV1AuthenticationInfo $authentication
+   */
+  public function setAuthentication(A2aV1AuthenticationInfo $authentication)
+  {
+    $this->authentication = $authentication;
+  }
+  /**
+   * @return A2aV1AuthenticationInfo
+   */
+  public function getAuthentication()
+  {
+    return $this->authentication;
+  }
+  /**
+   * A unique identifier (e.g. UUID) for this push notification.
+   *
+   * @param string $id
+   */
+  public function setId($id)
+  {
+    $this->id = $id;
+  }
+  /**
+   * @return string
+   */
+  public function getId()
+  {
+    return $this->id;
+  }
+  /**
+   * Token unique for this task/session
+   *
+   * @param string $token
+   */
+  public function setToken($token)
+  {
+    $this->token = $token;
+  }
+  /**
+   * @return string
+   */
+  public function getToken()
+  {
+    return $this->token;
+  }
+  /**
+   * Url to send the notification too
+   *
+   * @param string $url
+   */
+  public function setUrl($url)
+  {
+    $this->url = $url;
+  }
+  /**
+   * @return string
+   */
+  public function getUrl()
+  {
+    return $this->url;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1PushNotificationConfig::class, 'Google_Service_DiscoveryEngine_A2aV1PushNotificationConfig');
diff --git a/src/DiscoveryEngine/A2aV1Security.php b/src/DiscoveryEngine/A2aV1Security.php
new file mode 100644
index 0000000000..c35aa4aa41
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1Security.php
@@ -0,0 +1,42 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1Security extends \Google\Model
+{
+  protected $schemesType = A2aV1StringList::class;
+  protected $schemesDataType = 'map';
+
+  /**
+   * @param A2aV1StringList[] $schemes
+   */
+  public function setSchemes($schemes)
+  {
+    $this->schemes = $schemes;
+  }
+  /**
+   * @return A2aV1StringList[]
+   */
+  public function getSchemes()
+  {
+    return $this->schemes;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1Security::class, 'Google_Service_DiscoveryEngine_A2aV1Security');
diff --git a/src/DiscoveryEngine/A2aV1SecurityScheme.php b/src/DiscoveryEngine/A2aV1SecurityScheme.php
new file mode 100644
index 0000000000..cb8b182213
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1SecurityScheme.php
@@ -0,0 +1,106 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1SecurityScheme extends \Google\Model
+{
+  protected $apiKeySecuritySchemeType = A2aV1APIKeySecurityScheme::class;
+  protected $apiKeySecuritySchemeDataType = '';
+  protected $httpAuthSecuritySchemeType = A2aV1HTTPAuthSecurityScheme::class;
+  protected $httpAuthSecuritySchemeDataType = '';
+  protected $mtlsSecuritySchemeType = A2aV1MutualTlsSecurityScheme::class;
+  protected $mtlsSecuritySchemeDataType = '';
+  protected $oauth2SecuritySchemeType = A2aV1OAuth2SecurityScheme::class;
+  protected $oauth2SecuritySchemeDataType = '';
+  protected $openIdConnectSecuritySchemeType = A2aV1OpenIdConnectSecurityScheme::class;
+  protected $openIdConnectSecuritySchemeDataType = '';
+
+  /**
+   * @param A2aV1APIKeySecurityScheme $apiKeySecurityScheme
+   */
+  public function setApiKeySecurityScheme(A2aV1APIKeySecurityScheme $apiKeySecurityScheme)
+  {
+    $this->apiKeySecurityScheme = $apiKeySecurityScheme;
+  }
+  /**
+   * @return A2aV1APIKeySecurityScheme
+   */
+  public function getApiKeySecurityScheme()
+  {
+    return $this->apiKeySecurityScheme;
+  }
+  /**
+   * @param A2aV1HTTPAuthSecurityScheme $httpAuthSecurityScheme
+   */
+  public function setHttpAuthSecurityScheme(A2aV1HTTPAuthSecurityScheme $httpAuthSecurityScheme)
+  {
+    $this->httpAuthSecurityScheme = $httpAuthSecurityScheme;
+  }
+  /**
+   * @return A2aV1HTTPAuthSecurityScheme
+   */
+  public function getHttpAuthSecurityScheme()
+  {
+    return $this->httpAuthSecurityScheme;
+  }
+  /**
+   * @param A2aV1MutualTlsSecurityScheme $mtlsSecurityScheme
+   */
+  public function setMtlsSecurityScheme(A2aV1MutualTlsSecurityScheme $mtlsSecurityScheme)
+  {
+    $this->mtlsSecurityScheme = $mtlsSecurityScheme;
+  }
+  /**
+   * @return A2aV1MutualTlsSecurityScheme
+   */
+  public function getMtlsSecurityScheme()
+  {
+    return $this->mtlsSecurityScheme;
+  }
+  /**
+   * @param A2aV1OAuth2SecurityScheme $oauth2SecurityScheme
+   */
+  public function setOauth2SecurityScheme(A2aV1OAuth2SecurityScheme $oauth2SecurityScheme)
+  {
+    $this->oauth2SecurityScheme = $oauth2SecurityScheme;
+  }
+  /**
+   * @return A2aV1OAuth2SecurityScheme
+   */
+  public function getOauth2SecurityScheme()
+  {
+    return $this->oauth2SecurityScheme;
+  }
+  /**
+   * @param A2aV1OpenIdConnectSecurityScheme $openIdConnectSecurityScheme
+   */
+  public function setOpenIdConnectSecurityScheme(A2aV1OpenIdConnectSecurityScheme $openIdConnectSecurityScheme)
+  {
+    $this->openIdConnectSecurityScheme = $openIdConnectSecurityScheme;
+  }
+  /**
+   * @return A2aV1OpenIdConnectSecurityScheme
+   */
+  public function getOpenIdConnectSecurityScheme()
+  {
+    return $this->openIdConnectSecurityScheme;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1SecurityScheme::class, 'Google_Service_DiscoveryEngine_A2aV1SecurityScheme');
diff --git a/src/DiscoveryEngine/A2aV1SendMessageConfiguration.php b/src/DiscoveryEngine/A2aV1SendMessageConfiguration.php
new file mode 100644
index 0000000000..182390e027
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1SendMessageConfiguration.php
@@ -0,0 +1,119 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1SendMessageConfiguration extends \Google\Collection
+{
+  protected $collection_key = 'acceptedOutputModes';
+  /**
+   * The output modes that the agent is expected to respond with.
+   *
+   * @var string[]
+   */
+  public $acceptedOutputModes;
+  /**
+   * If true, the message will be blocking until the task is completed. If
+   * false, the message will be non-blocking and the task will be returned
+   * immediately. It is the caller's responsibility to check for any task
+   * updates.
+   *
+   * @var bool
+   */
+  public $blocking;
+  /**
+   * The maximum number of messages to include in the history. if 0, the history
+   * will be unlimited.
+   *
+   * @var int
+   */
+  public $historyLength;
+  protected $pushNotificationType = A2aV1PushNotificationConfig::class;
+  protected $pushNotificationDataType = '';
+
+  /**
+   * The output modes that the agent is expected to respond with.
+   *
+   * @param string[] $acceptedOutputModes
+   */
+  public function setAcceptedOutputModes($acceptedOutputModes)
+  {
+    $this->acceptedOutputModes = $acceptedOutputModes;
+  }
+  /**
+   * @return string[]
+   */
+  public function getAcceptedOutputModes()
+  {
+    return $this->acceptedOutputModes;
+  }
+  /**
+   * If true, the message will be blocking until the task is completed. If
+   * false, the message will be non-blocking and the task will be returned
+   * immediately. It is the caller's responsibility to check for any task
+   * updates.
+   *
+   * @param bool $blocking
+   */
+  public function setBlocking($blocking)
+  {
+    $this->blocking = $blocking;
+  }
+  /**
+   * @return bool
+   */
+  public function getBlocking()
+  {
+    return $this->blocking;
+  }
+  /**
+   * The maximum number of messages to include in the history. if 0, the history
+   * will be unlimited.
+   *
+   * @param int $historyLength
+   */
+  public function setHistoryLength($historyLength)
+  {
+    $this->historyLength = $historyLength;
+  }
+  /**
+   * @return int
+   */
+  public function getHistoryLength()
+  {
+    return $this->historyLength;
+  }
+  /**
+   * A configuration of a webhook that can be used to receive updates
+   *
+   * @param A2aV1PushNotificationConfig $pushNotification
+   */
+  public function setPushNotification(A2aV1PushNotificationConfig $pushNotification)
+  {
+    $this->pushNotification = $pushNotification;
+  }
+  /**
+   * @return A2aV1PushNotificationConfig
+   */
+  public function getPushNotification()
+  {
+    return $this->pushNotification;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1SendMessageConfiguration::class, 'Google_Service_DiscoveryEngine_A2aV1SendMessageConfiguration');
diff --git a/src/DiscoveryEngine/A2aV1SendMessageRequest.php b/src/DiscoveryEngine/A2aV1SendMessageRequest.php
new file mode 100644
index 0000000000..fb6fbd97d7
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1SendMessageRequest.php
@@ -0,0 +1,84 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1SendMessageRequest extends \Google\Model
+{
+  protected $configurationType = A2aV1SendMessageConfiguration::class;
+  protected $configurationDataType = '';
+  protected $messageType = A2aV1Message::class;
+  protected $messageDataType = '';
+  /**
+   * Optional metadata for the request.
+   *
+   * @var array[]
+   */
+  public $metadata;
+
+  /**
+   * Configuration for the send request.
+   *
+   * @param A2aV1SendMessageConfiguration $configuration
+   */
+  public function setConfiguration(A2aV1SendMessageConfiguration $configuration)
+  {
+    $this->configuration = $configuration;
+  }
+  /**
+   * @return A2aV1SendMessageConfiguration
+   */
+  public function getConfiguration()
+  {
+    return $this->configuration;
+  }
+  /**
+   * Required. The message to send to the agent.
+   *
+   * @param A2aV1Message $message
+   */
+  public function setMessage(A2aV1Message $message)
+  {
+    $this->message = $message;
+  }
+  /**
+   * @return A2aV1Message
+   */
+  public function getMessage()
+  {
+    return $this->message;
+  }
+  /**
+   * Optional metadata for the request.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1SendMessageRequest::class, 'Google_Service_DiscoveryEngine_A2aV1SendMessageRequest');
diff --git a/src/DiscoveryEngine/A2aV1SendMessageResponse.php b/src/DiscoveryEngine/A2aV1SendMessageResponse.php
new file mode 100644
index 0000000000..7ef15ca7dd
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1SendMessageResponse.php
@@ -0,0 +1,58 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1SendMessageResponse extends \Google\Model
+{
+  protected $messageType = A2aV1Message::class;
+  protected $messageDataType = '';
+  protected $taskType = A2aV1Task::class;
+  protected $taskDataType = '';
+
+  /**
+   * @param A2aV1Message $message
+   */
+  public function setMessage(A2aV1Message $message)
+  {
+    $this->message = $message;
+  }
+  /**
+   * @return A2aV1Message
+   */
+  public function getMessage()
+  {
+    return $this->message;
+  }
+  /**
+   * @param A2aV1Task $task
+   */
+  public function setTask(A2aV1Task $task)
+  {
+    $this->task = $task;
+  }
+  /**
+   * @return A2aV1Task
+   */
+  public function getTask()
+  {
+    return $this->task;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1SendMessageResponse::class, 'Google_Service_DiscoveryEngine_A2aV1SendMessageResponse');
diff --git a/src/DiscoveryEngine/A2aV1StreamResponse.php b/src/DiscoveryEngine/A2aV1StreamResponse.php
new file mode 100644
index 0000000000..0614e663aa
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1StreamResponse.php
@@ -0,0 +1,90 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1StreamResponse extends \Google\Model
+{
+  protected $artifactUpdateType = A2aV1TaskArtifactUpdateEvent::class;
+  protected $artifactUpdateDataType = '';
+  protected $messageType = A2aV1Message::class;
+  protected $messageDataType = '';
+  protected $statusUpdateType = A2aV1TaskStatusUpdateEvent::class;
+  protected $statusUpdateDataType = '';
+  protected $taskType = A2aV1Task::class;
+  protected $taskDataType = '';
+
+  /**
+   * @param A2aV1TaskArtifactUpdateEvent $artifactUpdate
+   */
+  public function setArtifactUpdate(A2aV1TaskArtifactUpdateEvent $artifactUpdate)
+  {
+    $this->artifactUpdate = $artifactUpdate;
+  }
+  /**
+   * @return A2aV1TaskArtifactUpdateEvent
+   */
+  public function getArtifactUpdate()
+  {
+    return $this->artifactUpdate;
+  }
+  /**
+   * @param A2aV1Message $message
+   */
+  public function setMessage(A2aV1Message $message)
+  {
+    $this->message = $message;
+  }
+  /**
+   * @return A2aV1Message
+   */
+  public function getMessage()
+  {
+    return $this->message;
+  }
+  /**
+   * @param A2aV1TaskStatusUpdateEvent $statusUpdate
+   */
+  public function setStatusUpdate(A2aV1TaskStatusUpdateEvent $statusUpdate)
+  {
+    $this->statusUpdate = $statusUpdate;
+  }
+  /**
+   * @return A2aV1TaskStatusUpdateEvent
+   */
+  public function getStatusUpdate()
+  {
+    return $this->statusUpdate;
+  }
+  /**
+   * @param A2aV1Task $task
+   */
+  public function setTask(A2aV1Task $task)
+  {
+    $this->task = $task;
+  }
+  /**
+   * @return A2aV1Task
+   */
+  public function getTask()
+  {
+    return $this->task;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1StreamResponse::class, 'Google_Service_DiscoveryEngine_A2aV1StreamResponse');
diff --git a/src/DiscoveryEngine/A2aV1StringList.php b/src/DiscoveryEngine/A2aV1StringList.php
new file mode 100644
index 0000000000..b27ea5fb80
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1StringList.php
@@ -0,0 +1,45 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1StringList extends \Google\Collection
+{
+  protected $collection_key = 'list';
+  /**
+   * @var string[]
+   */
+  public $list;
+
+  /**
+   * @param string[] $list
+   */
+  public function setList($list)
+  {
+    $this->list = $list;
+  }
+  /**
+   * @return string[]
+   */
+  public function getList()
+  {
+    return $this->list;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1StringList::class, 'Google_Service_DiscoveryEngine_A2aV1StringList');
diff --git a/src/DiscoveryEngine/A2aV1Task.php b/src/DiscoveryEngine/A2aV1Task.php
new file mode 100644
index 0000000000..e1d21b34bc
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1Task.php
@@ -0,0 +1,154 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1Task extends \Google\Collection
+{
+  protected $collection_key = 'history';
+  protected $artifactsType = A2aV1Artifact::class;
+  protected $artifactsDataType = 'array';
+  /**
+   * Unique identifier (e.g. UUID) for the contextual collection of interactions
+   * (tasks and messages). Created by the A2A server.
+   *
+   * @var string
+   */
+  public $contextId;
+  protected $historyType = A2aV1Message::class;
+  protected $historyDataType = 'array';
+  /**
+   * Unique identifier (e.g. UUID) for the task, generated by the server for a
+   * new task.
+   *
+   * @var string
+   */
+  public $id;
+  /**
+   * protolint:enable REPEATED_FIELD_NAMES_PLURALIZED A key/value object to
+   * store custom metadata about a task.
+   *
+   * @var array[]
+   */
+  public $metadata;
+  protected $statusType = A2aV1TaskStatus::class;
+  protected $statusDataType = '';
+
+  /**
+   * A set of output artifacts for a Task.
+   *
+   * @param A2aV1Artifact[] $artifacts
+   */
+  public function setArtifacts($artifacts)
+  {
+    $this->artifacts = $artifacts;
+  }
+  /**
+   * @return A2aV1Artifact[]
+   */
+  public function getArtifacts()
+  {
+    return $this->artifacts;
+  }
+  /**
+   * Unique identifier (e.g. UUID) for the contextual collection of interactions
+   * (tasks and messages). Created by the A2A server.
+   *
+   * @param string $contextId
+   */
+  public function setContextId($contextId)
+  {
+    $this->contextId = $contextId;
+  }
+  /**
+   * @return string
+   */
+  public function getContextId()
+  {
+    return $this->contextId;
+  }
+  /**
+   * protolint:disable REPEATED_FIELD_NAMES_PLURALIZED The history of
+   * interactions from a task.
+   *
+   * @param A2aV1Message[] $history
+   */
+  public function setHistory($history)
+  {
+    $this->history = $history;
+  }
+  /**
+   * @return A2aV1Message[]
+   */
+  public function getHistory()
+  {
+    return $this->history;
+  }
+  /**
+   * Unique identifier (e.g. UUID) for the task, generated by the server for a
+   * new task.
+   *
+   * @param string $id
+   */
+  public function setId($id)
+  {
+    $this->id = $id;
+  }
+  /**
+   * @return string
+   */
+  public function getId()
+  {
+    return $this->id;
+  }
+  /**
+   * protolint:enable REPEATED_FIELD_NAMES_PLURALIZED A key/value object to
+   * store custom metadata about a task.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+  /**
+   * The current status of a Task, including state and a message.
+   *
+   * @param A2aV1TaskStatus $status
+   */
+  public function setStatus(A2aV1TaskStatus $status)
+  {
+    $this->status = $status;
+  }
+  /**
+   * @return A2aV1TaskStatus
+   */
+  public function getStatus()
+  {
+    return $this->status;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1Task::class, 'Google_Service_DiscoveryEngine_A2aV1Task');
diff --git a/src/DiscoveryEngine/A2aV1TaskArtifactUpdateEvent.php b/src/DiscoveryEngine/A2aV1TaskArtifactUpdateEvent.php
new file mode 100644
index 0000000000..3bbe9832ed
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1TaskArtifactUpdateEvent.php
@@ -0,0 +1,154 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1TaskArtifactUpdateEvent extends \Google\Model
+{
+  /**
+   * Whether this should be appended to a prior one produced
+   *
+   * @var bool
+   */
+  public $append;
+  protected $artifactType = A2aV1Artifact::class;
+  protected $artifactDataType = '';
+  /**
+   * The id of the context that this task belongs too
+   *
+   * @var string
+   */
+  public $contextId;
+  /**
+   * Whether this represents the last part of an artifact
+   *
+   * @var bool
+   */
+  public $lastChunk;
+  /**
+   * Optional metadata associated with the artifact update.
+   *
+   * @var array[]
+   */
+  public $metadata;
+  /**
+   * The id of the task for this artifact
+   *
+   * @var string
+   */
+  public $taskId;
+
+  /**
+   * Whether this should be appended to a prior one produced
+   *
+   * @param bool $append
+   */
+  public function setAppend($append)
+  {
+    $this->append = $append;
+  }
+  /**
+   * @return bool
+   */
+  public function getAppend()
+  {
+    return $this->append;
+  }
+  /**
+   * The artifact itself
+   *
+   * @param A2aV1Artifact $artifact
+   */
+  public function setArtifact(A2aV1Artifact $artifact)
+  {
+    $this->artifact = $artifact;
+  }
+  /**
+   * @return A2aV1Artifact
+   */
+  public function getArtifact()
+  {
+    return $this->artifact;
+  }
+  /**
+   * The id of the context that this task belongs too
+   *
+   * @param string $contextId
+   */
+  public function setContextId($contextId)
+  {
+    $this->contextId = $contextId;
+  }
+  /**
+   * @return string
+   */
+  public function getContextId()
+  {
+    return $this->contextId;
+  }
+  /**
+   * Whether this represents the last part of an artifact
+   *
+   * @param bool $lastChunk
+   */
+  public function setLastChunk($lastChunk)
+  {
+    $this->lastChunk = $lastChunk;
+  }
+  /**
+   * @return bool
+   */
+  public function getLastChunk()
+  {
+    return $this->lastChunk;
+  }
+  /**
+   * Optional metadata associated with the artifact update.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+  /**
+   * The id of the task for this artifact
+   *
+   * @param string $taskId
+   */
+  public function setTaskId($taskId)
+  {
+    $this->taskId = $taskId;
+  }
+  /**
+   * @return string
+   */
+  public function getTaskId()
+  {
+    return $this->taskId;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1TaskArtifactUpdateEvent::class, 'Google_Service_DiscoveryEngine_A2aV1TaskArtifactUpdateEvent');
diff --git a/src/DiscoveryEngine/A2aV1TaskPushNotificationConfig.php b/src/DiscoveryEngine/A2aV1TaskPushNotificationConfig.php
new file mode 100644
index 0000000000..28dcbffe61
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1TaskPushNotificationConfig.php
@@ -0,0 +1,68 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1TaskPushNotificationConfig extends \Google\Model
+{
+  /**
+   * The resource name of the config. Format:
+   * tasks/{task_id}/pushNotificationConfigs/{config_id}
+   *
+   * @var string
+   */
+  public $name;
+  protected $pushNotificationConfigType = A2aV1PushNotificationConfig::class;
+  protected $pushNotificationConfigDataType = '';
+
+  /**
+   * The resource name of the config. Format:
+   * tasks/{task_id}/pushNotificationConfigs/{config_id}
+   *
+   * @param string $name
+   */
+  public function setName($name)
+  {
+    $this->name = $name;
+  }
+  /**
+   * @return string
+   */
+  public function getName()
+  {
+    return $this->name;
+  }
+  /**
+   * The push notification configuration details.
+   *
+   * @param A2aV1PushNotificationConfig $pushNotificationConfig
+   */
+  public function setPushNotificationConfig(A2aV1PushNotificationConfig $pushNotificationConfig)
+  {
+    $this->pushNotificationConfig = $pushNotificationConfig;
+  }
+  /**
+   * @return A2aV1PushNotificationConfig
+   */
+  public function getPushNotificationConfig()
+  {
+    return $this->pushNotificationConfig;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1TaskPushNotificationConfig::class, 'Google_Service_DiscoveryEngine_A2aV1TaskPushNotificationConfig');
diff --git a/src/DiscoveryEngine/A2aV1TaskStatus.php b/src/DiscoveryEngine/A2aV1TaskStatus.php
new file mode 100644
index 0000000000..a7cdcd0c88
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1TaskStatus.php
@@ -0,0 +1,132 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1TaskStatus extends \Google\Model
+{
+  public const STATE_TASK_STATE_UNSPECIFIED = 'TASK_STATE_UNSPECIFIED';
+  /**
+   * Represents the status that acknowledges a task is created
+   */
+  public const STATE_TASK_STATE_SUBMITTED = 'TASK_STATE_SUBMITTED';
+  /**
+   * Represents the status that a task is actively being processed
+   */
+  public const STATE_TASK_STATE_WORKING = 'TASK_STATE_WORKING';
+  /**
+   * Represents the status a task is finished. This is a terminal state
+   */
+  public const STATE_TASK_STATE_COMPLETED = 'TASK_STATE_COMPLETED';
+  /**
+   * Represents the status a task is done but failed. This is a terminal state
+   */
+  public const STATE_TASK_STATE_FAILED = 'TASK_STATE_FAILED';
+  /**
+   * Represents the status a task was cancelled before it finished. This is a
+   * terminal state.
+   */
+  public const STATE_TASK_STATE_CANCELLED = 'TASK_STATE_CANCELLED';
+  /**
+   * Represents the status that the task requires information to complete. This
+   * is an interrupted state.
+   */
+  public const STATE_TASK_STATE_INPUT_REQUIRED = 'TASK_STATE_INPUT_REQUIRED';
+  /**
+   * Represents the status that the agent has decided to not perform the task.
+   * This may be done during initial task creation or later once an agent has
+   * determined it can't or won't proceed. This is a terminal state.
+   */
+  public const STATE_TASK_STATE_REJECTED = 'TASK_STATE_REJECTED';
+  /**
+   * Represents the state that some authentication is needed from the upstream
+   * client. Authentication is expected to come out-of-band thus this is not an
+   * interrupted or terminal state.
+   */
+  public const STATE_TASK_STATE_AUTH_REQUIRED = 'TASK_STATE_AUTH_REQUIRED';
+  protected $messageType = A2aV1Message::class;
+  protected $messageDataType = '';
+  /**
+   * The current state of this task
+   *
+   * @var string
+   */
+  public $state;
+  /**
+   * Timestamp when the status was recorded. Example: "2023-10-27T10:00:00Z"
+   *
+   * @var string
+   */
+  public $timestamp;
+
+  /**
+   * A message associated with the status.
+   *
+   * @param A2aV1Message $message
+   */
+  public function setMessage(A2aV1Message $message)
+  {
+    $this->message = $message;
+  }
+  /**
+   * @return A2aV1Message
+   */
+  public function getMessage()
+  {
+    return $this->message;
+  }
+  /**
+   * The current state of this task
+   *
+   * Accepted values: TASK_STATE_UNSPECIFIED, TASK_STATE_SUBMITTED,
+   * TASK_STATE_WORKING, TASK_STATE_COMPLETED, TASK_STATE_FAILED,
+   * TASK_STATE_CANCELLED, TASK_STATE_INPUT_REQUIRED, TASK_STATE_REJECTED,
+   * TASK_STATE_AUTH_REQUIRED
+   *
+   * @param self::STATE_* $state
+   */
+  public function setState($state)
+  {
+    $this->state = $state;
+  }
+  /**
+   * @return self::STATE_*
+   */
+  public function getState()
+  {
+    return $this->state;
+  }
+  /**
+   * Timestamp when the status was recorded. Example: "2023-10-27T10:00:00Z"
+   *
+   * @param string $timestamp
+   */
+  public function setTimestamp($timestamp)
+  {
+    $this->timestamp = $timestamp;
+  }
+  /**
+   * @return string
+   */
+  public function getTimestamp()
+  {
+    return $this->timestamp;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1TaskStatus::class, 'Google_Service_DiscoveryEngine_A2aV1TaskStatus');
diff --git a/src/DiscoveryEngine/A2aV1TaskStatusUpdateEvent.php b/src/DiscoveryEngine/A2aV1TaskStatusUpdateEvent.php
new file mode 100644
index 0000000000..873c8325c1
--- /dev/null
+++ b/src/DiscoveryEngine/A2aV1TaskStatusUpdateEvent.php
@@ -0,0 +1,132 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine;
+
+class A2aV1TaskStatusUpdateEvent extends \Google\Model
+{
+  /**
+   * The id of the context that the task belongs to
+   *
+   * @var string
+   */
+  public $contextId;
+  /**
+   * Whether this is the last status update expected for this task.
+   *
+   * @var bool
+   */
+  public $final;
+  /**
+   * Optional metadata to associate with the task update.
+   *
+   * @var array[]
+   */
+  public $metadata;
+  protected $statusType = A2aV1TaskStatus::class;
+  protected $statusDataType = '';
+  /**
+   * The id of the task that is changed
+   *
+   * @var string
+   */
+  public $taskId;
+
+  /**
+   * The id of the context that the task belongs to
+   *
+   * @param string $contextId
+   */
+  public function setContextId($contextId)
+  {
+    $this->contextId = $contextId;
+  }
+  /**
+   * @return string
+   */
+  public function getContextId()
+  {
+    return $this->contextId;
+  }
+  /**
+   * Whether this is the last status update expected for this task.
+   *
+   * @param bool $final
+   */
+  public function setFinal($final)
+  {
+    $this->final = $final;
+  }
+  /**
+   * @return bool
+   */
+  public function getFinal()
+  {
+    return $this->final;
+  }
+  /**
+   * Optional metadata to associate with the task update.
+   *
+   * @param array[] $metadata
+   */
+  public function setMetadata($metadata)
+  {
+    $this->metadata = $metadata;
+  }
+  /**
+   * @return array[]
+   */
+  public function getMetadata()
+  {
+    return $this->metadata;
+  }
+  /**
+   * The new status of the task.
+   *
+   * @param A2aV1TaskStatus $status
+   */
+  public function setStatus(A2aV1TaskStatus $status)
+  {
+    $this->status = $status;
+  }
+  /**
+   * @return A2aV1TaskStatus
+   */
+  public function getStatus()
+  {
+    return $this->status;
+  }
+  /**
+   * The id of the task that is changed
+   *
+   * @param string $taskId
+   */
+  public function setTaskId($taskId)
+  {
+    $this->taskId = $taskId;
+  }
+  /**
+   * @return string
+   */
+  public function getTaskId()
+  {
+    return $this->taskId;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(A2aV1TaskStatusUpdateEvent::class, 'Google_Service_DiscoveryEngine_A2aV1TaskStatusUpdateEvent');
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1DataConnector.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1DataConnector.php
index 589890624c..3234d0f48d 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1DataConnector.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1DataConnector.php
@@ -112,6 +112,10 @@ class GoogleCloudDiscoveryengineV1DataConnector extends \Google\Collection
    * Google Sites connector.
    */
   public const CONNECTOR_TYPE_GOOGLE_SITES = 'GOOGLE_SITES';
+  /**
+   * Remote MCP based connector.
+   */
+  public const CONNECTOR_TYPE_REMOTE_MCP = 'REMOTE_MCP';
   /**
    * Default value.
    */
@@ -581,7 +585,7 @@ public function getConnectorModes()
    * Accepted values: CONNECTOR_TYPE_UNSPECIFIED, THIRD_PARTY, GCP_FHIR,
    * BIG_QUERY, GCS, GOOGLE_MAIL, GOOGLE_CALENDAR, GOOGLE_DRIVE,
    * NATIVE_CLOUD_IDENTITY, THIRD_PARTY_FEDERATED, THIRD_PARTY_EUA, GCNV,
-   * GOOGLE_CHAT, GOOGLE_SITES
+   * GOOGLE_CHAT, GOOGLE_SITES, REMOTE_MCP
    *
    * @param self::CONNECTOR_TYPE_* $connectorType
    */
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1Engine.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1Engine.php
index 5f0eeebc3a..39d0a89542 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1Engine.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1Engine.php
@@ -102,6 +102,14 @@ class GoogleCloudDiscoveryengineV1Engine extends \Google\Collection
    * @var string
    */
   public $configurableBillingApproach;
+  /**
+   * Optional. Maps a connector ID (e.g., "hybrid-github", "shopify") to tenant-
+   * specific information required for that connector. The structure of the
+   * tenant information string is connector-dependent.
+   *
+   * @var string[]
+   */
+  public $connectorTenantInfo;
   /**
    * Output only. Timestamp the Recommendation Engine was created at.
    *
@@ -304,6 +312,24 @@ public function getConfigurableBillingApproach()
   {
     return $this->configurableBillingApproach;
   }
+  /**
+   * Optional. Maps a connector ID (e.g., "hybrid-github", "shopify") to tenant-
+   * specific information required for that connector. The structure of the
+   * tenant information string is connector-dependent.
+   *
+   * @param string[] $connectorTenantInfo
+   */
+  public function setConnectorTenantInfo($connectorTenantInfo)
+  {
+    $this->connectorTenantInfo = $connectorTenantInfo;
+  }
+  /**
+   * @return string[]
+   */
+  public function getConnectorTenantInfo()
+  {
+    return $this->connectorTenantInfo;
+  }
   /**
    * Output only. Timestamp the Recommendation Engine was created at.
    *
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1LicenseConfig.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1LicenseConfig.php
index 8c865037df..cd0a717b01 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1LicenseConfig.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1LicenseConfig.php
@@ -64,6 +64,10 @@ class GoogleCloudDiscoveryengineV1LicenseConfig extends \Google\Model
    * 3 years.
    */
   public const SUBSCRIPTION_TERM_SUBSCRIPTION_TERM_THREE_YEARS = 'SUBSCRIPTION_TERM_THREE_YEARS';
+  /**
+   * Custom term. Must set the end_date.
+   */
+  public const SUBSCRIPTION_TERM_SUBSCRIPTION_TERM_CUSTOM = 'SUBSCRIPTION_TERM_CUSTOM';
   /**
    * Default value.
    */
@@ -362,7 +366,7 @@ public function getState()
    *
    * Accepted values: SUBSCRIPTION_TERM_UNSPECIFIED,
    * SUBSCRIPTION_TERM_ONE_MONTH, SUBSCRIPTION_TERM_ONE_YEAR,
-   * SUBSCRIPTION_TERM_THREE_YEARS
+   * SUBSCRIPTION_TERM_THREE_YEARS, SUBSCRIPTION_TERM_CUSTOM
    *
    * @param self::SUBSCRIPTION_TERM_* $subscriptionTerm
    */
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaDataConnector.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaDataConnector.php
index f1e46e91c5..adde73e076 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaDataConnector.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaDataConnector.php
@@ -112,6 +112,10 @@ class GoogleCloudDiscoveryengineV1alphaDataConnector extends \Google\Collection
    * Google Sites connector.
    */
   public const CONNECTOR_TYPE_GOOGLE_SITES = 'GOOGLE_SITES';
+  /**
+   * Remote MCP based connector.
+   */
+  public const CONNECTOR_TYPE_REMOTE_MCP = 'REMOTE_MCP';
   /**
    * Default value.
    */
@@ -583,7 +587,7 @@ public function getConnectorModes()
    * Accepted values: CONNECTOR_TYPE_UNSPECIFIED, THIRD_PARTY, GCP_FHIR,
    * BIG_QUERY, GCS, GOOGLE_MAIL, GOOGLE_CALENDAR, GOOGLE_DRIVE,
    * NATIVE_CLOUD_IDENTITY, THIRD_PARTY_FEDERATED, THIRD_PARTY_EUA, GCNV,
-   * GOOGLE_CHAT, GOOGLE_SITES
+   * GOOGLE_CHAT, GOOGLE_SITES, REMOTE_MCP
    *
    * @param self::CONNECTOR_TYPE_* $connectorType
    */
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaEngine.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaEngine.php
index ae3498e447..1d0acb312e 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaEngine.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaEngine.php
@@ -102,6 +102,14 @@ class GoogleCloudDiscoveryengineV1alphaEngine extends \Google\Collection
    * @var string
    */
   public $configurableBillingApproach;
+  /**
+   * Optional. Maps a connector ID (e.g., "hybrid-github", "shopify") to tenant-
+   * specific information required for that connector. The structure of the
+   * tenant information string is connector-dependent.
+   *
+   * @var string[]
+   */
+  public $connectorTenantInfo;
   /**
    * Output only. Timestamp the Recommendation Engine was created at.
    *
@@ -308,6 +316,24 @@ public function getConfigurableBillingApproach()
   {
     return $this->configurableBillingApproach;
   }
+  /**
+   * Optional. Maps a connector ID (e.g., "hybrid-github", "shopify") to tenant-
+   * specific information required for that connector. The structure of the
+   * tenant information string is connector-dependent.
+   *
+   * @param string[] $connectorTenantInfo
+   */
+  public function setConnectorTenantInfo($connectorTenantInfo)
+  {
+    $this->connectorTenantInfo = $connectorTenantInfo;
+  }
+  /**
+   * @return string[]
+   */
+  public function getConnectorTenantInfo()
+  {
+    return $this->connectorTenantInfo;
+  }
   /**
    * Output only. Timestamp the Recommendation Engine was created at.
    *
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaLicenseConfig.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaLicenseConfig.php
index 25d828564d..071ce911e3 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaLicenseConfig.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaLicenseConfig.php
@@ -64,6 +64,10 @@ class GoogleCloudDiscoveryengineV1alphaLicenseConfig extends \Google\Model
    * 3 years.
    */
   public const SUBSCRIPTION_TERM_SUBSCRIPTION_TERM_THREE_YEARS = 'SUBSCRIPTION_TERM_THREE_YEARS';
+  /**
+   * Custom term. Must set the end_date.
+   */
+  public const SUBSCRIPTION_TERM_SUBSCRIPTION_TERM_CUSTOM = 'SUBSCRIPTION_TERM_CUSTOM';
   /**
    * Default value.
    */
@@ -380,7 +384,7 @@ public function getState()
    *
    * Accepted values: SUBSCRIPTION_TERM_UNSPECIFIED,
    * SUBSCRIPTION_TERM_ONE_MONTH, SUBSCRIPTION_TERM_ONE_YEAR,
-   * SUBSCRIPTION_TERM_THREE_YEARS
+   * SUBSCRIPTION_TERM_THREE_YEARS, SUBSCRIPTION_TERM_CUSTOM
    *
    * @param self::SUBSCRIPTION_TERM_* $subscriptionTerm
    */
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaSearchRequest.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaSearchRequest.php
index 70e55b7e85..12a89fb8bc 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaSearchRequest.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1alphaSearchRequest.php
@@ -139,9 +139,8 @@ class GoogleCloudDiscoveryengineV1alphaSearchRequest extends \Google\Collection
   protected $naturalLanguageQueryUnderstandingSpecDataType = '';
   /**
    * Optional. The maximum number of results to retrieve from each data store.
-   * If not specified, it will use the
-   * SearchRequest.data_store_specs.num_results if provided, otherwise there is
-   * no limit.
+   * If not specified, it will use the SearchRequest.DataStoreSpec.num_results
+   * if provided, otherwise there is no limit.
    *
    * @var int
    */
@@ -690,9 +689,8 @@ public function getNaturalLanguageQueryUnderstandingSpec()
   }
   /**
    * Optional. The maximum number of results to retrieve from each data store.
-   * If not specified, it will use the
-   * SearchRequest.data_store_specs.num_results if provided, otherwise there is
-   * no limit.
+   * If not specified, it will use the SearchRequest.DataStoreSpec.num_results
+   * if provided, otherwise there is no limit.
    *
    * @param int $numResultsPerDataStore
    */
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaEngine.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaEngine.php
index e93dcfb14a..dfd7745993 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaEngine.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaEngine.php
@@ -102,6 +102,14 @@ class GoogleCloudDiscoveryengineV1betaEngine extends \Google\Collection
    * @var string
    */
   public $configurableBillingApproach;
+  /**
+   * Optional. Maps a connector ID (e.g., "hybrid-github", "shopify") to tenant-
+   * specific information required for that connector. The structure of the
+   * tenant information string is connector-dependent.
+   *
+   * @var string[]
+   */
+  public $connectorTenantInfo;
   /**
    * Output only. Timestamp the Recommendation Engine was created at.
    *
@@ -304,6 +312,24 @@ public function getConfigurableBillingApproach()
   {
     return $this->configurableBillingApproach;
   }
+  /**
+   * Optional. Maps a connector ID (e.g., "hybrid-github", "shopify") to tenant-
+   * specific information required for that connector. The structure of the
+   * tenant information string is connector-dependent.
+   *
+   * @param string[] $connectorTenantInfo
+   */
+  public function setConnectorTenantInfo($connectorTenantInfo)
+  {
+    $this->connectorTenantInfo = $connectorTenantInfo;
+  }
+  /**
+   * @return string[]
+   */
+  public function getConnectorTenantInfo()
+  {
+    return $this->connectorTenantInfo;
+  }
   /**
    * Output only. Timestamp the Recommendation Engine was created at.
    *
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaLicenseConfig.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaLicenseConfig.php
index fc1217abca..8f8c3c15bb 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaLicenseConfig.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaLicenseConfig.php
@@ -64,6 +64,10 @@ class GoogleCloudDiscoveryengineV1betaLicenseConfig extends \Google\Model
    * 3 years.
    */
   public const SUBSCRIPTION_TERM_SUBSCRIPTION_TERM_THREE_YEARS = 'SUBSCRIPTION_TERM_THREE_YEARS';
+  /**
+   * Custom term. Must set the end_date.
+   */
+  public const SUBSCRIPTION_TERM_SUBSCRIPTION_TERM_CUSTOM = 'SUBSCRIPTION_TERM_CUSTOM';
   /**
    * Default value.
    */
@@ -362,7 +366,7 @@ public function getState()
    *
    * Accepted values: SUBSCRIPTION_TERM_UNSPECIFIED,
    * SUBSCRIPTION_TERM_ONE_MONTH, SUBSCRIPTION_TERM_ONE_YEAR,
-   * SUBSCRIPTION_TERM_THREE_YEARS
+   * SUBSCRIPTION_TERM_THREE_YEARS, SUBSCRIPTION_TERM_CUSTOM
    *
    * @param self::SUBSCRIPTION_TERM_* $subscriptionTerm
    */
diff --git a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaSearchRequest.php b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaSearchRequest.php
index 7bf719eacd..32c9a8fa18 100644
--- a/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaSearchRequest.php
+++ b/src/DiscoveryEngine/GoogleCloudDiscoveryengineV1betaSearchRequest.php
@@ -137,9 +137,8 @@ class GoogleCloudDiscoveryengineV1betaSearchRequest extends \Google\Collection
   protected $naturalLanguageQueryUnderstandingSpecDataType = '';
   /**
    * Optional. The maximum number of results to retrieve from each data store.
-   * If not specified, it will use the
-   * SearchRequest.data_store_specs.num_results if provided, otherwise there is
-   * no limit.
+   * If not specified, it will use the SearchRequest.DataStoreSpec.num_results
+   * if provided, otherwise there is no limit.
    *
    * @var int
    */
@@ -662,9 +661,8 @@ public function getNaturalLanguageQueryUnderstandingSpec()
   }
   /**
    * Optional. The maximum number of results to retrieve from each data store.
-   * If not specified, it will use the
-   * SearchRequest.data_store_specs.num_results if provided, otherwise there is
-   * no limit.
+   * If not specified, it will use the SearchRequest.DataStoreSpec.num_results
+   * if provided, otherwise there is no limit.
    *
    * @param int $numResultsPerDataStore
    */
diff --git a/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgents.php b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgents.php
index 450cf96c2e..719170f47d 100644
--- a/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgents.php
+++ b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgents.php
@@ -17,6 +17,8 @@
 
 namespace Google\Service\DiscoveryEngine\Resource;
 
+use Google\Service\DiscoveryEngine\A2aV1AgentCard;
+
 /**
  * The "agents" collection of methods.
  * Typical usage is:
@@ -27,6 +29,21 @@
  */
 class ProjectsLocationsCollectionsEnginesAssistantsAgents extends \Google\Service\Resource
 {
+  /**
+   * GetAgentCard returns the agent card for the agent. (agents.getCard)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param array $optParams Optional parameters.
+   * @return A2aV1AgentCard
+   * @throws \Google\Service\Exception
+   */
+  public function getCard($tenant, $optParams = [])
+  {
+    $params = ['tenant' => $tenant];
+    $params = array_merge($params, $optParams);
+    return $this->call('getCard', [$params], A2aV1AgentCard::class);
+  }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage.php b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage.php
new file mode 100644
index 0000000000..92b12d73af
--- /dev/null
+++ b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage.php
@@ -0,0 +1,72 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine\Resource;
+
+use Google\Service\DiscoveryEngine\A2aV1SendMessageRequest;
+use Google\Service\DiscoveryEngine\A2aV1SendMessageResponse;
+use Google\Service\DiscoveryEngine\A2aV1StreamResponse;
+
+/**
+ * The "message" collection of methods.
+ * Typical usage is:
+ *  <code>
+ *   $discoveryengineService = new Google\Service\DiscoveryEngine(...);
+ *   $message = $discoveryengineService->projects_locations_collections_engines_assistants_agents_message;
+ *  </code>
+ */
+class ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage extends \Google\Service\Resource
+{
+  /**
+   * Send a message to the agent. This is a blocking call that will return the
+   * task once it is completed, or a LRO if requested. (message.send)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param A2aV1SendMessageRequest $postBody
+   * @param array $optParams Optional parameters.
+   * @return A2aV1SendMessageResponse
+   * @throws \Google\Service\Exception
+   */
+  public function send($tenant, A2aV1SendMessageRequest $postBody, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'postBody' => $postBody];
+    $params = array_merge($params, $optParams);
+    return $this->call('send', [$params], A2aV1SendMessageResponse::class);
+  }
+  /**
+   * SendStreamingMessage is a streaming call that will return a stream of task
+   * update events until the Task is in an interrupted or terminal state.
+   * (message.stream)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param A2aV1SendMessageRequest $postBody
+   * @param array $optParams Optional parameters.
+   * @return A2aV1StreamResponse
+   * @throws \Google\Service\Exception
+   */
+  public function stream($tenant, A2aV1SendMessageRequest $postBody, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'postBody' => $postBody];
+    $params = array_merge($params, $optParams);
+    return $this->call('stream', [$params], A2aV1StreamResponse::class);
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage::class, 'Google_Service_DiscoveryEngine_Resource_ProjectsLocationsCollectionsEnginesAssistantsAgentsMessage');
diff --git a/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks.php b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks.php
new file mode 100644
index 0000000000..36665b5dc5
--- /dev/null
+++ b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks.php
@@ -0,0 +1,96 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine\Resource;
+
+use Google\Service\DiscoveryEngine\A2aV1CancelTaskRequest;
+use Google\Service\DiscoveryEngine\A2aV1StreamResponse;
+use Google\Service\DiscoveryEngine\A2aV1Task;
+
+/**
+ * The "tasks" collection of methods.
+ * Typical usage is:
+ *  <code>
+ *   $discoveryengineService = new Google\Service\DiscoveryEngine(...);
+ *   $tasks = $discoveryengineService->projects_locations_collections_engines_assistants_agents_tasks;
+ *  </code>
+ */
+class ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks extends \Google\Service\Resource
+{
+  /**
+   * Cancel a task from the agent. If supported one should expect no more task
+   * updates for the task. (tasks.cancel)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $name The resource name of the task to cancel. Format:
+   * tasks/{task_id}
+   * @param A2aV1CancelTaskRequest $postBody
+   * @param array $optParams Optional parameters.
+   * @return A2aV1Task
+   * @throws \Google\Service\Exception
+   */
+  public function cancel($tenant, $name, A2aV1CancelTaskRequest $postBody, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'name' => $name, 'postBody' => $postBody];
+    $params = array_merge($params, $optParams);
+    return $this->call('cancel', [$params], A2aV1Task::class);
+  }
+  /**
+   * Get the current state of a task from the agent. (tasks.get)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $name Required. The resource name of the task. Format:
+   * tasks/{task_id}
+   * @param array $optParams Optional parameters.
+   *
+   * @opt_param int historyLength The number of most recent messages from the
+   * task's history to retrieve.
+   * @return A2aV1Task
+   * @throws \Google\Service\Exception
+   */
+  public function get($tenant, $name, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'name' => $name];
+    $params = array_merge($params, $optParams);
+    return $this->call('get', [$params], A2aV1Task::class);
+  }
+  /**
+   * TaskSubscription is a streaming call that will return a stream of task update
+   * events. This attaches the stream to an existing in process task. If the task
+   * is complete the stream will return the completed task (like GetTask) and
+   * close the stream. (tasks.subscribe)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $name The resource name of the task to subscribe to. Format:
+   * tasks/{task_id}
+   * @param array $optParams Optional parameters.
+   * @return A2aV1StreamResponse
+   * @throws \Google\Service\Exception
+   */
+  public function subscribe($tenant, $name, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'name' => $name];
+    $params = array_merge($params, $optParams);
+    return $this->call('subscribe', [$params], A2aV1StreamResponse::class);
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks::class, 'Google_Service_DiscoveryEngine_Resource_ProjectsLocationsCollectionsEnginesAssistantsAgentsTasks');
diff --git a/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs.php b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs.php
new file mode 100644
index 0000000000..e3bc2275f8
--- /dev/null
+++ b/src/DiscoveryEngine/Resource/ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs.php
@@ -0,0 +1,119 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\DiscoveryEngine\Resource;
+
+use Google\Service\DiscoveryEngine\A2aV1ListTaskPushNotificationConfigResponse;
+use Google\Service\DiscoveryEngine\A2aV1TaskPushNotificationConfig;
+use Google\Service\DiscoveryEngine\GoogleProtobufEmpty;
+
+/**
+ * The "pushNotificationConfigs" collection of methods.
+ * Typical usage is:
+ *  <code>
+ *   $discoveryengineService = new Google\Service\DiscoveryEngine(...);
+ *   $pushNotificationConfigs = $discoveryengineService->projects_locations_collections_engines_assistants_agents_tasks_pushNotificationConfigs;
+ *  </code>
+ */
+class ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs extends \Google\Service\Resource
+{
+  /**
+   * Set a push notification config for a task. (pushNotificationConfigs.create)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $parent Required. The parent task resource for this config.
+   * Format: tasks/{task_id}
+   * @param A2aV1TaskPushNotificationConfig $postBody
+   * @param array $optParams Optional parameters.
+   *
+   * @opt_param string configId Required. The ID for the new config.
+   * @return A2aV1TaskPushNotificationConfig
+   * @throws \Google\Service\Exception
+   */
+  public function create($tenant, $parent, A2aV1TaskPushNotificationConfig $postBody, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'parent' => $parent, 'postBody' => $postBody];
+    $params = array_merge($params, $optParams);
+    return $this->call('create', [$params], A2aV1TaskPushNotificationConfig::class);
+  }
+  /**
+   * Delete a push notification config for a task.
+   * (pushNotificationConfigs.delete)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $name The resource name of the config to delete. Format:
+   * tasks/{task_id}/pushNotificationConfigs/{config_id}
+   * @param array $optParams Optional parameters.
+   * @return GoogleProtobufEmpty
+   * @throws \Google\Service\Exception
+   */
+  public function delete($tenant, $name, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'name' => $name];
+    $params = array_merge($params, $optParams);
+    return $this->call('delete', [$params], GoogleProtobufEmpty::class);
+  }
+  /**
+   * Get a push notification config for a task. (pushNotificationConfigs.get)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $name The resource name of the config to retrieve. Format:
+   * tasks/{task_id}/pushNotificationConfigs/{config_id}
+   * @param array $optParams Optional parameters.
+   * @return A2aV1TaskPushNotificationConfig
+   * @throws \Google\Service\Exception
+   */
+  public function get($tenant, $name, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'name' => $name];
+    $params = array_merge($params, $optParams);
+    return $this->call('get', [$params], A2aV1TaskPushNotificationConfig::class);
+  }
+  /**
+   * Get a list of push notifications configured for a task. (pushNotificationConf
+   * igs.listProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificat
+   * ionConfigs)
+   *
+   * @param string $tenant Optional tenant, provided as a path parameter.
+   * Experimental, might still change for 1.0 release.
+   * @param string $parent The parent task resource. Format: tasks/{task_id}
+   * @param array $optParams Optional parameters.
+   *
+   * @opt_param int pageSize For AIP-158 these fields are present. Usually not
+   * used/needed. The maximum number of configurations to return. If unspecified,
+   * all configs will be returned.
+   * @opt_param string pageToken A page token received from a previous
+   * ListTaskPushNotificationConfigRequest call. Provide this to retrieve the
+   * subsequent page. When paginating, all other parameters provided to
+   * `ListTaskPushNotificationConfigRequest` must match the call that provided the
+   * page token.
+   * @return A2aV1ListTaskPushNotificationConfigResponse
+   * @throws \Google\Service\Exception
+   */
+  public function listProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs($tenant, $parent, $optParams = [])
+  {
+    $params = ['tenant' => $tenant, 'parent' => $parent];
+    $params = array_merge($params, $optParams);
+    return $this->call('list', [$params], A2aV1ListTaskPushNotificationConfigResponse::class);
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs::class, 'Google_Service_DiscoveryEngine_Resource_ProjectsLocationsCollectionsEnginesAssistantsAgentsTasksPushNotificationConfigs');