diff --git a/.generator/schemas/v2/openapi.yaml b/.generator/schemas/v2/openapi.yaml
index 3bd4dc4902..01713f0b6e 100644
--- a/.generator/schemas/v2/openapi.yaml
+++ b/.generator/schemas/v2/openapi.yaml
@@ -18173,6 +18173,25 @@ components:
         - tag_key
         - updated_at
       type: object
+    CostTagDescriptionResponse:
+      description: Single Cloud Cost Management tag key description returned by the get-by-key endpoint.
+      example:
+        data:
+          attributes:
+            cloud: aws
+            created_at: "2026-01-01T12:00:00Z"
+            description: AWS account that owns this cost.
+            source: human
+            tag_key: account_id
+            updated_at: "2026-01-01T12:00:00Z"
+          id: account_id
+          type: cost_tag_description
+      properties:
+        data:
+          $ref: "#/components/schemas/CostTagDescription"
+      required:
+        - data
+      type: object
     CostTagDescriptionSource:
       description: Origin of the description. `human` indicates the description was written by a user, `ai_generated` was produced by AI, and `datadog` is a default supplied by Datadog.
       enum:
@@ -18194,6 +18213,50 @@ components:
       type: string
       x-enum-varnames:
         - COST_TAG_DESCRIPTION
+    CostTagDescriptionUpsertRequest:
+      description: Request body for creating or updating a Cloud Cost Management tag key description.
+      example:
+        data:
+          attributes:
+            cloud: aws
+            description: AWS account that owns this cost.
+          id: account_id
+          type: cost_tag_description
+      properties:
+        data:
+          $ref: "#/components/schemas/CostTagDescriptionUpsertRequestData"
+      required:
+        - data
+      type: object
+    CostTagDescriptionUpsertRequestData:
+      description: Resource envelope carrying the tag key description being upserted. The `id` is informational; the authoritative tag key is taken from the URL path.
+      properties:
+        attributes:
+          $ref: "#/components/schemas/CostTagDescriptionUpsertRequestDataAttributes"
+        id:
+          description: Identifier of the tag key the description applies to. Matches the `tag_key` path parameter.
+          example: account_id
+          type: string
+        type:
+          $ref: "#/components/schemas/CostTagDescriptionType"
+      required:
+        - attributes
+        - type
+      type: object
+    CostTagDescriptionUpsertRequestDataAttributes:
+      description: Mutable attributes set when creating or updating a Cloud Cost Management tag key description.
+      properties:
+        cloud:
+          description: Cloud provider this description applies to (for example, `aws`). Omit to set the cross-cloud default for the tag key.
+          example: aws
+          type: string
+        description:
+          description: The human-readable description for the tag key.
+          example: AWS account that owns this cost.
+          type: string
+      required:
+        - description
+      type: object
     CostTagDescriptionsResponse:
       description: List of Cloud Cost Management tag key descriptions for the organization, optionally filtered to a single cloud provider.
       example:
@@ -34119,6 +34182,55 @@ components:
       required:
         - type
       type: object
+    GenerateCostTagDescriptionResponse:
+      description: Response wrapping an AI-generated Cloud Cost Management tag key description.
+      example:
+        data:
+          attributes:
+            description: AWS account that owns this cost.
+          id: account_id
+          type: cost_generated_tag_description
+      properties:
+        data:
+          $ref: "#/components/schemas/GeneratedCostTagDescription"
+      required:
+        - data
+      type: object
+    GeneratedCostTagDescription:
+      description: AI-generated Cloud Cost Management tag key description returned by the generate endpoint. The result is returned to the client but is not persisted by this endpoint.
+      properties:
+        attributes:
+          $ref: "#/components/schemas/GeneratedCostTagDescriptionAttributes"
+        id:
+          description: The tag key the AI description was generated for.
+          example: account_id
+          type: string
+        type:
+          $ref: "#/components/schemas/GeneratedCostTagDescriptionType"
+      required:
+        - attributes
+        - id
+        - type
+      type: object
+    GeneratedCostTagDescriptionAttributes:
+      description: Attributes of an AI-generated Cloud Cost Management tag key description.
+      properties:
+        description:
+          description: The AI-generated description for the tag key.
+          example: AWS account that owns this cost.
+          type: string
+      required:
+        - description
+      type: object
+    GeneratedCostTagDescriptionType:
+      default: cost_generated_tag_description
+      description: Type of the AI-generated Cloud Cost Management tag description resource.
+      enum:
+        - cost_generated_tag_description
+      example: cost_generated_tag_description
+      type: string
+      x-enum-varnames:
+        - COST_GENERATED_TAG_DESCRIPTION
     GetActionConnectionResponse:
       description: The response for found connection
       properties:
@@ -108672,6 +108784,226 @@ paths:
         operator: OR
         permissions:
           - cloud_cost_management_read
+  /api/v2/cost/tag_descriptions/{tag_key}:
+    delete:
+      description: Delete a Cloud Cost Management tag key description. When `cloud` is omitted, deletes every description for the tag key, falling back to Datadog's global default when available. When `cloud` is provided, deletes only the description scoped to that cloud provider.
+      operationId: DeleteCostTagDescriptionByKey
+      parameters:
+        - description: The tag key whose description is being deleted.
+          in: path
+          name: tag_key
+          required: true
+          schema:
+            type: string
+        - description: Cloud provider to scope the deletion to (for example, `aws`). Omit to delete every description for the tag key.
+          in: query
+          name: cloud
+          required: false
+          schema:
+            type: string
+      responses:
+        "204":
+          description: No Content
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Bad Request
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Forbidden
+        "429":
+          $ref: "#/components/responses/TooManyRequestsResponse"
+      security:
+        - apiKeyAuth: []
+          appKeyAuth: []
+        - AuthZ:
+            - cloud_cost_management_write
+      summary: Delete a Cloud Cost Management tag description
+      tags:
+        - Cloud Cost Management
+      "x-permission":
+        operator: OR
+        permissions:
+          - cloud_cost_management_write
+    get:
+      description: Get the Cloud Cost Management description for a single tag key. Use `filter[cloud]` to scope the lookup to a specific cloud provider; when omitted, the response resolves the description in fallback order (cloud-specific organization override, then cloudless organization default, then Datadog's global default).
+      operationId: GetCostTagDescriptionByKey
+      parameters:
+        - description: The tag key whose description is being fetched.
+          in: path
+          name: tag_key
+          required: true
+          schema:
+            type: string
+        - description: Cloud provider to scope the lookup to (for example, `aws`). Omit to use the resolved fallback.
+          in: query
+          name: filter[cloud]
+          required: false
+          schema:
+            type: string
+      responses:
+        "200":
+          content:
+            application/json:
+              examples:
+                default:
+                  value:
+                    data:
+                      attributes:
+                        cloud: aws
+                        created_at: "2026-01-01T12:00:00Z"
+                        description: AWS account that owns this cost.
+                        source: human
+                        tag_key: account_id
+                        updated_at: "2026-01-01T12:00:00Z"
+                      id: account_id
+                      type: cost_tag_description
+              schema:
+                $ref: "#/components/schemas/CostTagDescriptionResponse"
+          description: OK
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Bad Request
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Forbidden
+        "404":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Not Found
+        "429":
+          $ref: "#/components/responses/TooManyRequestsResponse"
+      security:
+        - apiKeyAuth: []
+          appKeyAuth: []
+        - AuthZ:
+            - cloud_cost_management_read
+      summary: Get a Cloud Cost Management tag description
+      tags:
+        - Cloud Cost Management
+      "x-permission":
+        operator: OR
+        permissions:
+          - cloud_cost_management_read
+    put:
+      description: Create or update a Cloud Cost Management tag key description. The new description and optional cloud scoping are supplied in the request body. Omit `cloud` to set a cross-cloud default for the tag key.
+      operationId: UpsertCostTagDescriptionByKey
+      parameters:
+        - description: The tag key whose description is being upserted.
+          in: path
+          name: tag_key
+          required: true
+          schema:
+            type: string
+      requestBody:
+        content:
+          application/json:
+            examples:
+              default:
+                value:
+                  data:
+                    attributes:
+                      cloud: aws
+                      description: AWS account that owns this cost.
+                    id: account_id
+                    type: cost_tag_description
+            schema:
+              $ref: "#/components/schemas/CostTagDescriptionUpsertRequest"
+        required: true
+      responses:
+        "204":
+          description: No Content
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Bad Request
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Forbidden
+        "429":
+          $ref: "#/components/responses/TooManyRequestsResponse"
+      security:
+        - apiKeyAuth: []
+          appKeyAuth: []
+        - AuthZ:
+            - cloud_cost_management_write
+      summary: Upsert a Cloud Cost Management tag description
+      tags:
+        - Cloud Cost Management
+      "x-permission":
+        operator: OR
+        permissions:
+          - cloud_cost_management_write
+  /api/v2/cost/tag_descriptions/{tag_key}/generate:
+    get:
+      description: Use AI to draft a Cloud Cost Management tag key description based on associated cost data. The generated description is returned in the response and is not persisted by this endpoint; follow up with `UpsertCostTagDescriptionByKey` to save it.
+      operationId: GenerateCostTagDescriptionByKey
+      parameters:
+        - description: The tag key to generate an AI description for.
+          in: path
+          name: tag_key
+          required: true
+          schema:
+            type: string
+      responses:
+        "200":
+          content:
+            application/json:
+              examples:
+                default:
+                  value:
+                    data:
+                      attributes:
+                        description: AWS account that owns this cost.
+                      id: account_id
+                      type: cost_generated_tag_description
+              schema:
+                $ref: "#/components/schemas/GenerateCostTagDescriptionResponse"
+          description: OK
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Bad Request
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/APIErrorResponse"
+          description: Forbidden
+        "429":
+          $ref: "#/components/responses/TooManyRequestsResponse"
+      security:
+        - apiKeyAuth: []
+          appKeyAuth: []
+        - AuthZ:
+            - cloud_cost_management_read
+      summary: Generate a Cloud Cost Management tag description
+      tags:
+        - Cloud Cost Management
+      "x-permission":
+        operator: OR
+        permissions:
+          - cloud_cost_management_read
   /api/v2/cost/tag_keys:
     get:
       description: List Cloud Cost Management tag keys.
diff --git a/docs/datadog_api_client.v2.model.rst b/docs/datadog_api_client.v2.model.rst
index 8ebe6f4853..9067c25bf8 100644
--- a/docs/datadog_api_client.v2.model.rst
+++ b/docs/datadog_api_client.v2.model.rst
@@ -7249,6 +7249,13 @@ datadog\_api\_client.v2.model.cost\_tag\_description\_attributes module
    :members:
    :show-inheritance:
 
+datadog\_api\_client.v2.model.cost\_tag\_description\_response module
+---------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.cost_tag_description_response
+   :members:
+   :show-inheritance:
+
 datadog\_api\_client.v2.model.cost\_tag\_description\_source module
 -------------------------------------------------------------------
 
@@ -7263,6 +7270,27 @@ datadog\_api\_client.v2.model.cost\_tag\_description\_type module
    :members:
    :show-inheritance:
 
+datadog\_api\_client.v2.model.cost\_tag\_description\_upsert\_request module
+----------------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.cost_tag_description_upsert_request
+   :members:
+   :show-inheritance:
+
+datadog\_api\_client.v2.model.cost\_tag\_description\_upsert\_request\_data module
+----------------------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.cost_tag_description_upsert_request_data
+   :members:
+   :show-inheritance:
+
+datadog\_api\_client.v2.model.cost\_tag\_description\_upsert\_request\_data\_attributes module
+----------------------------------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.cost_tag_description_upsert_request_data_attributes
+   :members:
+   :show-inheritance:
+
 datadog\_api\_client.v2.model.cost\_tag\_descriptions\_response module
 ----------------------------------------------------------------------
 
@@ -14095,6 +14123,34 @@ datadog\_api\_client.v2.model.gemini\_integration\_update module
    :members:
    :show-inheritance:
 
+datadog\_api\_client.v2.model.generate\_cost\_tag\_description\_response module
+-------------------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.generate_cost_tag_description_response
+   :members:
+   :show-inheritance:
+
+datadog\_api\_client.v2.model.generated\_cost\_tag\_description module
+----------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.generated_cost_tag_description
+   :members:
+   :show-inheritance:
+
+datadog\_api\_client.v2.model.generated\_cost\_tag\_description\_attributes module
+----------------------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.generated_cost_tag_description_attributes
+   :members:
+   :show-inheritance:
+
+datadog\_api\_client.v2.model.generated\_cost\_tag\_description\_type module
+----------------------------------------------------------------------------
+
+.. automodule:: datadog_api_client.v2.model.generated_cost_tag_description_type
+   :members:
+   :show-inheritance:
+
 datadog\_api\_client.v2.model.get\_action\_connection\_response module
 ----------------------------------------------------------------------
 
diff --git a/examples/v2/cloud-cost-management/DeleteCostTagDescriptionByKey.py b/examples/v2/cloud-cost-management/DeleteCostTagDescriptionByKey.py
new file mode 100644
index 0000000000..b77277960c
--- /dev/null
+++ b/examples/v2/cloud-cost-management/DeleteCostTagDescriptionByKey.py
@@ -0,0 +1,13 @@
+"""
+Delete a Cloud Cost Management tag description returns "No Content" response
+"""
+
+from datadog_api_client import ApiClient, Configuration
+from datadog_api_client.v2.api.cloud_cost_management_api import CloudCostManagementApi
+
+configuration = Configuration()
+with ApiClient(configuration) as api_client:
+    api_instance = CloudCostManagementApi(api_client)
+    api_instance.delete_cost_tag_description_by_key(
+        tag_key="tag_key",
+    )
diff --git a/examples/v2/cloud-cost-management/GenerateCostTagDescriptionByKey.py b/examples/v2/cloud-cost-management/GenerateCostTagDescriptionByKey.py
new file mode 100644
index 0000000000..53b0e6ab7a
--- /dev/null
+++ b/examples/v2/cloud-cost-management/GenerateCostTagDescriptionByKey.py
@@ -0,0 +1,15 @@
+"""
+Generate a Cloud Cost Management tag description returns "OK" response
+"""
+
+from datadog_api_client import ApiClient, Configuration
+from datadog_api_client.v2.api.cloud_cost_management_api import CloudCostManagementApi
+
+configuration = Configuration()
+with ApiClient(configuration) as api_client:
+    api_instance = CloudCostManagementApi(api_client)
+    response = api_instance.generate_cost_tag_description_by_key(
+        tag_key="tag_key",
+    )
+
+    print(response)
diff --git a/examples/v2/cloud-cost-management/GetCostTagDescriptionByKey.py b/examples/v2/cloud-cost-management/GetCostTagDescriptionByKey.py
new file mode 100644
index 0000000000..57eacf6829
--- /dev/null
+++ b/examples/v2/cloud-cost-management/GetCostTagDescriptionByKey.py
@@ -0,0 +1,15 @@
+"""
+Get a Cloud Cost Management tag description returns "OK" response
+"""
+
+from datadog_api_client import ApiClient, Configuration
+from datadog_api_client.v2.api.cloud_cost_management_api import CloudCostManagementApi
+
+configuration = Configuration()
+with ApiClient(configuration) as api_client:
+    api_instance = CloudCostManagementApi(api_client)
+    response = api_instance.get_cost_tag_description_by_key(
+        tag_key="tag_key",
+    )
+
+    print(response)
diff --git a/examples/v2/cloud-cost-management/UpsertCostTagDescriptionByKey.py b/examples/v2/cloud-cost-management/UpsertCostTagDescriptionByKey.py
new file mode 100644
index 0000000000..0c3b19897d
--- /dev/null
+++ b/examples/v2/cloud-cost-management/UpsertCostTagDescriptionByKey.py
@@ -0,0 +1,28 @@
+"""
+Upsert a Cloud Cost Management tag description returns "No Content" response
+"""
+
+from datadog_api_client import ApiClient, Configuration
+from datadog_api_client.v2.api.cloud_cost_management_api import CloudCostManagementApi
+from datadog_api_client.v2.model.cost_tag_description_type import CostTagDescriptionType
+from datadog_api_client.v2.model.cost_tag_description_upsert_request import CostTagDescriptionUpsertRequest
+from datadog_api_client.v2.model.cost_tag_description_upsert_request_data import CostTagDescriptionUpsertRequestData
+from datadog_api_client.v2.model.cost_tag_description_upsert_request_data_attributes import (
+    CostTagDescriptionUpsertRequestDataAttributes,
+)
+
+body = CostTagDescriptionUpsertRequest(
+    data=CostTagDescriptionUpsertRequestData(
+        attributes=CostTagDescriptionUpsertRequestDataAttributes(
+            cloud="aws",
+            description="AWS account that owns this cost.",
+        ),
+        id="account_id",
+        type=CostTagDescriptionType.COST_TAG_DESCRIPTION,
+    ),
+)
+
+configuration = Configuration()
+with ApiClient(configuration) as api_client:
+    api_instance = CloudCostManagementApi(api_client)
+    api_instance.upsert_cost_tag_description_by_key(tag_key="tag_key", body=body)
diff --git a/src/datadog_api_client/v2/api/cloud_cost_management_api.py b/src/datadog_api_client/v2/api/cloud_cost_management_api.py
index 654644f9dd..9df255c33a 100644
--- a/src/datadog_api_client/v2/api/cloud_cost_management_api.py
+++ b/src/datadog_api_client/v2/api/cloud_cost_management_api.py
@@ -59,6 +59,9 @@
 from datadog_api_client.v2.model.cost_recommendation_array import CostRecommendationArray
 from datadog_api_client.v2.model.recommendations_filter_request import RecommendationsFilterRequest
 from datadog_api_client.v2.model.cost_tag_descriptions_response import CostTagDescriptionsResponse
+from datadog_api_client.v2.model.cost_tag_description_response import CostTagDescriptionResponse
+from datadog_api_client.v2.model.cost_tag_description_upsert_request import CostTagDescriptionUpsertRequest
+from datadog_api_client.v2.model.generate_cost_tag_description_response import GenerateCostTagDescriptionResponse
 from datadog_api_client.v2.model.cost_tag_keys_response import CostTagKeysResponse
 from datadog_api_client.v2.model.cost_tag_key_response import CostTagKeyResponse
 from datadog_api_client.v2.model.cost_tag_key_metadata_response import CostTagKeyMetadataResponse
@@ -280,6 +283,34 @@ def __init__(self, api_client=None):
             api_client=api_client,
         )
 
+        self._delete_cost_tag_description_by_key_endpoint = _Endpoint(
+            settings={
+                "response_type": None,
+                "auth": ["apiKeyAuth", "appKeyAuth", "AuthZ"],
+                "endpoint_path": "/api/v2/cost/tag_descriptions/{tag_key}",
+                "operation_id": "delete_cost_tag_description_by_key",
+                "http_method": "DELETE",
+                "version": "v2",
+            },
+            params_map={
+                "tag_key": {
+                    "required": True,
+                    "openapi_types": (str,),
+                    "attribute": "tag_key",
+                    "location": "path",
+                },
+                "cloud": {
+                    "openapi_types": (str,),
+                    "attribute": "cloud",
+                    "location": "query",
+                },
+            },
+            headers_map={
+                "accept": ["*/*"],
+            },
+            api_client=api_client,
+        )
+
         self._delete_custom_allocation_rule_endpoint = _Endpoint(
             settings={
                 "response_type": None,
@@ -349,6 +380,29 @@ def __init__(self, api_client=None):
             api_client=api_client,
         )
 
+        self._generate_cost_tag_description_by_key_endpoint = _Endpoint(
+            settings={
+                "response_type": (GenerateCostTagDescriptionResponse,),
+                "auth": ["apiKeyAuth", "appKeyAuth", "AuthZ"],
+                "endpoint_path": "/api/v2/cost/tag_descriptions/{tag_key}/generate",
+                "operation_id": "generate_cost_tag_description_by_key",
+                "http_method": "GET",
+                "version": "v2",
+            },
+            params_map={
+                "tag_key": {
+                    "required": True,
+                    "openapi_types": (str,),
+                    "attribute": "tag_key",
+                    "location": "path",
+                },
+            },
+            headers_map={
+                "accept": ["application/json"],
+            },
+            api_client=api_client,
+        )
+
         self._get_budget_endpoint = _Endpoint(
             settings={
                 "response_type": (BudgetWithEntries,),
@@ -847,6 +901,34 @@ def __init__(self, api_client=None):
             api_client=api_client,
         )
 
+        self._get_cost_tag_description_by_key_endpoint = _Endpoint(
+            settings={
+                "response_type": (CostTagDescriptionResponse,),
+                "auth": ["apiKeyAuth", "appKeyAuth", "AuthZ"],
+                "endpoint_path": "/api/v2/cost/tag_descriptions/{tag_key}",
+                "operation_id": "get_cost_tag_description_by_key",
+                "http_method": "GET",
+                "version": "v2",
+            },
+            params_map={
+                "tag_key": {
+                    "required": True,
+                    "openapi_types": (str,),
+                    "attribute": "tag_key",
+                    "location": "path",
+                },
+                "filter_cloud": {
+                    "openapi_types": (str,),
+                    "attribute": "filter[cloud]",
+                    "location": "query",
+                },
+            },
+            headers_map={
+                "accept": ["application/json"],
+            },
+            api_client=api_client,
+        )
+
         self._get_cost_tag_key_endpoint = _Endpoint(
             settings={
                 "response_type": (CostTagKeyResponse,),
@@ -1710,6 +1792,32 @@ def __init__(self, api_client=None):
             api_client=api_client,
         )
 
+        self._upsert_cost_tag_description_by_key_endpoint = _Endpoint(
+            settings={
+                "response_type": None,
+                "auth": ["apiKeyAuth", "appKeyAuth", "AuthZ"],
+                "endpoint_path": "/api/v2/cost/tag_descriptions/{tag_key}",
+                "operation_id": "upsert_cost_tag_description_by_key",
+                "http_method": "PUT",
+                "version": "v2",
+            },
+            params_map={
+                "tag_key": {
+                    "required": True,
+                    "openapi_types": (str,),
+                    "attribute": "tag_key",
+                    "location": "path",
+                },
+                "body": {
+                    "required": True,
+                    "openapi_types": (CostTagDescriptionUpsertRequest,),
+                    "location": "body",
+                },
+            },
+            headers_map={"accept": ["*/*"], "content_type": ["application/json"]},
+            api_client=api_client,
+        )
+
         self._validate_budget_endpoint = _Endpoint(
             settings={
                 "response_type": (BudgetValidationResponse,),
@@ -1928,6 +2036,30 @@ def delete_cost_gcp_usage_cost_config(
 
         return self._delete_cost_gcp_usage_cost_config_endpoint.call_with_http_info(**kwargs)
 
+    def delete_cost_tag_description_by_key(
+        self,
+        tag_key: str,
+        *,
+        cloud: Union[str, UnsetType] = unset,
+    ) -> None:
+        """Delete a Cloud Cost Management tag description.
+
+        Delete a Cloud Cost Management tag key description. When ``cloud`` is omitted, deletes every description for the tag key, falling back to Datadog's global default when available. When ``cloud`` is provided, deletes only the description scoped to that cloud provider.
+
+        :param tag_key: The tag key whose description is being deleted.
+        :type tag_key: str
+        :param cloud: Cloud provider to scope the deletion to (for example, ``aws`` ). Omit to delete every description for the tag key.
+        :type cloud: str, optional
+        :rtype: None
+        """
+        kwargs: Dict[str, Any] = {}
+        kwargs["tag_key"] = tag_key
+
+        if cloud is not unset:
+            kwargs["cloud"] = cloud
+
+        return self._delete_cost_tag_description_by_key_endpoint.call_with_http_info(**kwargs)
+
     def delete_custom_allocation_rule(
         self,
         rule_id: int,
@@ -1979,6 +2111,23 @@ def delete_tag_pipelines_ruleset(
 
         return self._delete_tag_pipelines_ruleset_endpoint.call_with_http_info(**kwargs)
 
+    def generate_cost_tag_description_by_key(
+        self,
+        tag_key: str,
+    ) -> GenerateCostTagDescriptionResponse:
+        """Generate a Cloud Cost Management tag description.
+
+        Use AI to draft a Cloud Cost Management tag key description based on associated cost data. The generated description is returned in the response and is not persisted by this endpoint; follow up with ``UpsertCostTagDescriptionByKey`` to save it.
+
+        :param tag_key: The tag key to generate an AI description for.
+        :type tag_key: str
+        :rtype: GenerateCostTagDescriptionResponse
+        """
+        kwargs: Dict[str, Any] = {}
+        kwargs["tag_key"] = tag_key
+
+        return self._generate_cost_tag_description_by_key_endpoint.call_with_http_info(**kwargs)
+
     def get_budget(
         self,
         budget_id: str,
@@ -2394,6 +2543,30 @@ def get_cost_gcp_usage_cost_config(
 
         return self._get_cost_gcp_usage_cost_config_endpoint.call_with_http_info(**kwargs)
 
+    def get_cost_tag_description_by_key(
+        self,
+        tag_key: str,
+        *,
+        filter_cloud: Union[str, UnsetType] = unset,
+    ) -> CostTagDescriptionResponse:
+        """Get a Cloud Cost Management tag description.
+
+        Get the Cloud Cost Management description for a single tag key. Use ``filter[cloud]`` to scope the lookup to a specific cloud provider; when omitted, the response resolves the description in fallback order (cloud-specific organization override, then cloudless organization default, then Datadog's global default).
+
+        :param tag_key: The tag key whose description is being fetched.
+        :type tag_key: str
+        :param filter_cloud: Cloud provider to scope the lookup to (for example, ``aws`` ). Omit to use the resolved fallback.
+        :type filter_cloud: str, optional
+        :rtype: CostTagDescriptionResponse
+        """
+        kwargs: Dict[str, Any] = {}
+        kwargs["tag_key"] = tag_key
+
+        if filter_cloud is not unset:
+            kwargs["filter_cloud"] = filter_cloud
+
+        return self._get_cost_tag_description_by_key_endpoint.call_with_http_info(**kwargs)
+
     def get_cost_tag_key(
         self,
         tag_key: str,
@@ -3155,6 +3328,27 @@ def upsert_budget(
 
         return self._upsert_budget_endpoint.call_with_http_info(**kwargs)
 
+    def upsert_cost_tag_description_by_key(
+        self,
+        tag_key: str,
+        body: CostTagDescriptionUpsertRequest,
+    ) -> None:
+        """Upsert a Cloud Cost Management tag description.
+
+        Create or update a Cloud Cost Management tag key description. The new description and optional cloud scoping are supplied in the request body. Omit ``cloud`` to set a cross-cloud default for the tag key.
+
+        :param tag_key: The tag key whose description is being upserted.
+        :type tag_key: str
+        :type body: CostTagDescriptionUpsertRequest
+        :rtype: None
+        """
+        kwargs: Dict[str, Any] = {}
+        kwargs["tag_key"] = tag_key
+
+        kwargs["body"] = body
+
+        return self._upsert_cost_tag_description_by_key_endpoint.call_with_http_info(**kwargs)
+
     def validate_budget(
         self,
         body: BudgetValidationRequest,
diff --git a/src/datadog_api_client/v2/model/cost_tag_description_response.py b/src/datadog_api_client/v2/model/cost_tag_description_response.py
new file mode 100644
index 0000000000..59cc9424ef
--- /dev/null
+++ b/src/datadog_api_client/v2/model/cost_tag_description_response.py
@@ -0,0 +1,40 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+)
+
+
+if TYPE_CHECKING:
+    from datadog_api_client.v2.model.cost_tag_description import CostTagDescription
+
+
+class CostTagDescriptionResponse(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        from datadog_api_client.v2.model.cost_tag_description import CostTagDescription
+
+        return {
+            "data": (CostTagDescription,),
+        }
+
+    attribute_map = {
+        "data": "data",
+    }
+
+    def __init__(self_, data: CostTagDescription, **kwargs):
+        """
+        Single Cloud Cost Management tag key description returned by the get-by-key endpoint.
+
+        :param data: A Cloud Cost Management tag key description, either cross-cloud or scoped to a single cloud provider.
+        :type data: CostTagDescription
+        """
+        super().__init__(kwargs)
+
+        self_.data = data
diff --git a/src/datadog_api_client/v2/model/cost_tag_description_upsert_request.py b/src/datadog_api_client/v2/model/cost_tag_description_upsert_request.py
new file mode 100644
index 0000000000..6c737374ca
--- /dev/null
+++ b/src/datadog_api_client/v2/model/cost_tag_description_upsert_request.py
@@ -0,0 +1,42 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+)
+
+
+if TYPE_CHECKING:
+    from datadog_api_client.v2.model.cost_tag_description_upsert_request_data import CostTagDescriptionUpsertRequestData
+
+
+class CostTagDescriptionUpsertRequest(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        from datadog_api_client.v2.model.cost_tag_description_upsert_request_data import (
+            CostTagDescriptionUpsertRequestData,
+        )
+
+        return {
+            "data": (CostTagDescriptionUpsertRequestData,),
+        }
+
+    attribute_map = {
+        "data": "data",
+    }
+
+    def __init__(self_, data: CostTagDescriptionUpsertRequestData, **kwargs):
+        """
+        Request body for creating or updating a Cloud Cost Management tag key description.
+
+        :param data: Resource envelope carrying the tag key description being upserted. The ``id`` is informational; the authoritative tag key is taken from the URL path.
+        :type data: CostTagDescriptionUpsertRequestData
+        """
+        super().__init__(kwargs)
+
+        self_.data = data
diff --git a/src/datadog_api_client/v2/model/cost_tag_description_upsert_request_data.py b/src/datadog_api_client/v2/model/cost_tag_description_upsert_request_data.py
new file mode 100644
index 0000000000..8235562357
--- /dev/null
+++ b/src/datadog_api_client/v2/model/cost_tag_description_upsert_request_data.py
@@ -0,0 +1,67 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+from typing import Union, TYPE_CHECKING
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+    unset,
+    UnsetType,
+)
+
+
+if TYPE_CHECKING:
+    from datadog_api_client.v2.model.cost_tag_description_upsert_request_data_attributes import (
+        CostTagDescriptionUpsertRequestDataAttributes,
+    )
+    from datadog_api_client.v2.model.cost_tag_description_type import CostTagDescriptionType
+
+
+class CostTagDescriptionUpsertRequestData(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        from datadog_api_client.v2.model.cost_tag_description_upsert_request_data_attributes import (
+            CostTagDescriptionUpsertRequestDataAttributes,
+        )
+        from datadog_api_client.v2.model.cost_tag_description_type import CostTagDescriptionType
+
+        return {
+            "attributes": (CostTagDescriptionUpsertRequestDataAttributes,),
+            "id": (str,),
+            "type": (CostTagDescriptionType,),
+        }
+
+    attribute_map = {
+        "attributes": "attributes",
+        "id": "id",
+        "type": "type",
+    }
+
+    def __init__(
+        self_,
+        attributes: CostTagDescriptionUpsertRequestDataAttributes,
+        type: CostTagDescriptionType,
+        id: Union[str, UnsetType] = unset,
+        **kwargs,
+    ):
+        """
+        Resource envelope carrying the tag key description being upserted. The ``id`` is informational; the authoritative tag key is taken from the URL path.
+
+        :param attributes: Mutable attributes set when creating or updating a Cloud Cost Management tag key description.
+        :type attributes: CostTagDescriptionUpsertRequestDataAttributes
+
+        :param id: Identifier of the tag key the description applies to. Matches the ``tag_key`` path parameter.
+        :type id: str, optional
+
+        :param type: Type of the Cloud Cost Management tag description resource.
+        :type type: CostTagDescriptionType
+        """
+        if id is not unset:
+            kwargs["id"] = id
+        super().__init__(kwargs)
+
+        self_.attributes = attributes
+        self_.type = type
diff --git a/src/datadog_api_client/v2/model/cost_tag_description_upsert_request_data_attributes.py b/src/datadog_api_client/v2/model/cost_tag_description_upsert_request_data_attributes.py
new file mode 100644
index 0000000000..37d6e9cee8
--- /dev/null
+++ b/src/datadog_api_client/v2/model/cost_tag_description_upsert_request_data_attributes.py
@@ -0,0 +1,43 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+from typing import Union
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+    unset,
+    UnsetType,
+)
+
+
+class CostTagDescriptionUpsertRequestDataAttributes(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        return {
+            "cloud": (str,),
+            "description": (str,),
+        }
+
+    attribute_map = {
+        "cloud": "cloud",
+        "description": "description",
+    }
+
+    def __init__(self_, description: str, cloud: Union[str, UnsetType] = unset, **kwargs):
+        """
+        Mutable attributes set when creating or updating a Cloud Cost Management tag key description.
+
+        :param cloud: Cloud provider this description applies to (for example, ``aws`` ). Omit to set the cross-cloud default for the tag key.
+        :type cloud: str, optional
+
+        :param description: The human-readable description for the tag key.
+        :type description: str
+        """
+        if cloud is not unset:
+            kwargs["cloud"] = cloud
+        super().__init__(kwargs)
+
+        self_.description = description
diff --git a/src/datadog_api_client/v2/model/generate_cost_tag_description_response.py b/src/datadog_api_client/v2/model/generate_cost_tag_description_response.py
new file mode 100644
index 0000000000..3fc515cb79
--- /dev/null
+++ b/src/datadog_api_client/v2/model/generate_cost_tag_description_response.py
@@ -0,0 +1,40 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+)
+
+
+if TYPE_CHECKING:
+    from datadog_api_client.v2.model.generated_cost_tag_description import GeneratedCostTagDescription
+
+
+class GenerateCostTagDescriptionResponse(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        from datadog_api_client.v2.model.generated_cost_tag_description import GeneratedCostTagDescription
+
+        return {
+            "data": (GeneratedCostTagDescription,),
+        }
+
+    attribute_map = {
+        "data": "data",
+    }
+
+    def __init__(self_, data: GeneratedCostTagDescription, **kwargs):
+        """
+        Response wrapping an AI-generated Cloud Cost Management tag key description.
+
+        :param data: AI-generated Cloud Cost Management tag key description returned by the generate endpoint. The result is returned to the client but is not persisted by this endpoint.
+        :type data: GeneratedCostTagDescription
+        """
+        super().__init__(kwargs)
+
+        self_.data = data
diff --git a/src/datadog_api_client/v2/model/generated_cost_tag_description.py b/src/datadog_api_client/v2/model/generated_cost_tag_description.py
new file mode 100644
index 0000000000..ac8195f3f2
--- /dev/null
+++ b/src/datadog_api_client/v2/model/generated_cost_tag_description.py
@@ -0,0 +1,64 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+)
+
+
+if TYPE_CHECKING:
+    from datadog_api_client.v2.model.generated_cost_tag_description_attributes import (
+        GeneratedCostTagDescriptionAttributes,
+    )
+    from datadog_api_client.v2.model.generated_cost_tag_description_type import GeneratedCostTagDescriptionType
+
+
+class GeneratedCostTagDescription(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        from datadog_api_client.v2.model.generated_cost_tag_description_attributes import (
+            GeneratedCostTagDescriptionAttributes,
+        )
+        from datadog_api_client.v2.model.generated_cost_tag_description_type import GeneratedCostTagDescriptionType
+
+        return {
+            "attributes": (GeneratedCostTagDescriptionAttributes,),
+            "id": (str,),
+            "type": (GeneratedCostTagDescriptionType,),
+        }
+
+    attribute_map = {
+        "attributes": "attributes",
+        "id": "id",
+        "type": "type",
+    }
+
+    def __init__(
+        self_,
+        attributes: GeneratedCostTagDescriptionAttributes,
+        id: str,
+        type: GeneratedCostTagDescriptionType,
+        **kwargs,
+    ):
+        """
+        AI-generated Cloud Cost Management tag key description returned by the generate endpoint. The result is returned to the client but is not persisted by this endpoint.
+
+        :param attributes: Attributes of an AI-generated Cloud Cost Management tag key description.
+        :type attributes: GeneratedCostTagDescriptionAttributes
+
+        :param id: The tag key the AI description was generated for.
+        :type id: str
+
+        :param type: Type of the AI-generated Cloud Cost Management tag description resource.
+        :type type: GeneratedCostTagDescriptionType
+        """
+        super().__init__(kwargs)
+
+        self_.attributes = attributes
+        self_.id = id
+        self_.type = type
diff --git a/src/datadog_api_client/v2/model/generated_cost_tag_description_attributes.py b/src/datadog_api_client/v2/model/generated_cost_tag_description_attributes.py
new file mode 100644
index 0000000000..f104e08f69
--- /dev/null
+++ b/src/datadog_api_client/v2/model/generated_cost_tag_description_attributes.py
@@ -0,0 +1,33 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+
+from datadog_api_client.model_utils import (
+    ModelNormal,
+    cached_property,
+)
+
+
+class GeneratedCostTagDescriptionAttributes(ModelNormal):
+    @cached_property
+    def openapi_types(_):
+        return {
+            "description": (str,),
+        }
+
+    attribute_map = {
+        "description": "description",
+    }
+
+    def __init__(self_, description: str, **kwargs):
+        """
+        Attributes of an AI-generated Cloud Cost Management tag key description.
+
+        :param description: The AI-generated description for the tag key.
+        :type description: str
+        """
+        super().__init__(kwargs)
+
+        self_.description = description
diff --git a/src/datadog_api_client/v2/model/generated_cost_tag_description_type.py b/src/datadog_api_client/v2/model/generated_cost_tag_description_type.py
new file mode 100644
index 0000000000..775090aee7
--- /dev/null
+++ b/src/datadog_api_client/v2/model/generated_cost_tag_description_type.py
@@ -0,0 +1,37 @@
+# Unless explicitly stated otherwise all files in this repository are licensed under the Apache-2.0 License.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019-Present Datadog, Inc.
+from __future__ import annotations
+
+
+from datadog_api_client.model_utils import (
+    ModelSimple,
+    cached_property,
+)
+
+from typing import ClassVar
+
+
+class GeneratedCostTagDescriptionType(ModelSimple):
+    """
+    Type of the AI-generated Cloud Cost Management tag description resource.
+
+    :param value: If omitted defaults to "cost_generated_tag_description". Must be one of ["cost_generated_tag_description"].
+    :type value: str
+    """
+
+    allowed_values = {
+        "cost_generated_tag_description",
+    }
+    COST_GENERATED_TAG_DESCRIPTION: ClassVar["GeneratedCostTagDescriptionType"]
+
+    @cached_property
+    def openapi_types(_):
+        return {
+            "value": (str,),
+        }
+
+
+GeneratedCostTagDescriptionType.COST_GENERATED_TAG_DESCRIPTION = GeneratedCostTagDescriptionType(
+    "cost_generated_tag_description"
+)
diff --git a/src/datadog_api_client/v2/models/__init__.py b/src/datadog_api_client/v2/models/__init__.py
index 304ac498cc..3ab56c7566 100644
--- a/src/datadog_api_client/v2/models/__init__.py
+++ b/src/datadog_api_client/v2/models/__init__.py
@@ -1327,8 +1327,14 @@
 from datadog_api_client.v2.model.cost_tag_attributes import CostTagAttributes
 from datadog_api_client.v2.model.cost_tag_description import CostTagDescription
 from datadog_api_client.v2.model.cost_tag_description_attributes import CostTagDescriptionAttributes
+from datadog_api_client.v2.model.cost_tag_description_response import CostTagDescriptionResponse
 from datadog_api_client.v2.model.cost_tag_description_source import CostTagDescriptionSource
 from datadog_api_client.v2.model.cost_tag_description_type import CostTagDescriptionType
+from datadog_api_client.v2.model.cost_tag_description_upsert_request import CostTagDescriptionUpsertRequest
+from datadog_api_client.v2.model.cost_tag_description_upsert_request_data import CostTagDescriptionUpsertRequestData
+from datadog_api_client.v2.model.cost_tag_description_upsert_request_data_attributes import (
+    CostTagDescriptionUpsertRequestDataAttributes,
+)
 from datadog_api_client.v2.model.cost_tag_descriptions_response import CostTagDescriptionsResponse
 from datadog_api_client.v2.model.cost_tag_key import CostTagKey
 from datadog_api_client.v2.model.cost_tag_key_attributes import CostTagKeyAttributes
@@ -2647,6 +2653,10 @@
 from datadog_api_client.v2.model.gemini_integration import GeminiIntegration
 from datadog_api_client.v2.model.gemini_integration_type import GeminiIntegrationType
 from datadog_api_client.v2.model.gemini_integration_update import GeminiIntegrationUpdate
+from datadog_api_client.v2.model.generate_cost_tag_description_response import GenerateCostTagDescriptionResponse
+from datadog_api_client.v2.model.generated_cost_tag_description import GeneratedCostTagDescription
+from datadog_api_client.v2.model.generated_cost_tag_description_attributes import GeneratedCostTagDescriptionAttributes
+from datadog_api_client.v2.model.generated_cost_tag_description_type import GeneratedCostTagDescriptionType
 from datadog_api_client.v2.model.get_action_connection_response import GetActionConnectionResponse
 from datadog_api_client.v2.model.get_app_key_registration_response import GetAppKeyRegistrationResponse
 from datadog_api_client.v2.model.get_app_response import GetAppResponse
@@ -9268,8 +9278,12 @@
     "CostTagAttributes",
     "CostTagDescription",
     "CostTagDescriptionAttributes",
+    "CostTagDescriptionResponse",
     "CostTagDescriptionSource",
     "CostTagDescriptionType",
+    "CostTagDescriptionUpsertRequest",
+    "CostTagDescriptionUpsertRequestData",
+    "CostTagDescriptionUpsertRequestDataAttributes",
     "CostTagDescriptionsResponse",
     "CostTagKey",
     "CostTagKeyAttributes",
@@ -10246,6 +10260,10 @@
     "GeminiIntegration",
     "GeminiIntegrationType",
     "GeminiIntegrationUpdate",
+    "GenerateCostTagDescriptionResponse",
+    "GeneratedCostTagDescription",
+    "GeneratedCostTagDescriptionAttributes",
+    "GeneratedCostTagDescriptionType",
     "GetActionConnectionResponse",
     "GetAppKeyRegistrationResponse",
     "GetAppResponse",
diff --git a/tests/v2/features/cloud_cost_management.feature b/tests/v2/features/cloud_cost_management.feature
index 17779e4599..8a8beef7ce 100644
--- a/tests/v2/features/cloud_cost_management.feature
+++ b/tests/v2/features/cloud_cost_management.feature
@@ -190,6 +190,20 @@ Feature: Cloud Cost Management
     When the request is sent
     Then the response status is 404 Not Found
 
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Delete a Cloud Cost Management tag description returns "Bad Request" response
+    Given new "DeleteCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 400 Bad Request
+
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Delete a Cloud Cost Management tag description returns "No Content" response
+    Given new "DeleteCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 204 No Content
+
   @team:DataDog/cloud-cost-management
   Scenario: Delete a budget returns "Bad Request" response
     Given new "DeleteBudget" request
@@ -218,6 +232,20 @@ Feature: Cloud Cost Management
     When the request is sent
     Then the response status is 204 No Content
 
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Generate a Cloud Cost Management tag description returns "Bad Request" response
+    Given new "GenerateCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 400 Bad Request
+
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Generate a Cloud Cost Management tag description returns "OK" response
+    Given new "GenerateCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 200 OK
+
   @replay-only @team:DataDog/cloud-cost-management
   Scenario: Get Custom Costs File returns "OK" response
     Given new "GetCustomCostsFile" request
@@ -250,6 +278,27 @@ Feature: Cloud Cost Management
     And the response "data.type" is equal to "gcp_uc_config"
     And the response "data.attributes.account_id" is equal to "123456_ABCDEF_123ABC"
 
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Get a Cloud Cost Management tag description returns "Bad Request" response
+    Given new "GetCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 400 Bad Request
+
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Get a Cloud Cost Management tag description returns "Not Found" response
+    Given new "GetCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 404 Not Found
+
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Get a Cloud Cost Management tag description returns "OK" response
+    Given new "GetCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    When the request is sent
+    Then the response status is 200 OK
+
   @generated @skip @team:DataDog/cloud-cost-management
   Scenario: Get a Cloud Cost Management tag key returns "Bad Request" response
     Given new "GetCostTagKey" request
@@ -857,6 +906,22 @@ Feature: Cloud Cost Management
     When the request is sent
     Then the response status is 400 Bad Request
 
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Upsert a Cloud Cost Management tag description returns "Bad Request" response
+    Given new "UpsertCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    And body with value {"data": {"attributes": {"cloud": "aws", "description": "AWS account that owns this cost."}, "id": "account_id", "type": "cost_tag_description"}}
+    When the request is sent
+    Then the response status is 400 Bad Request
+
+  @generated @skip @team:DataDog/cloud-cost-management
+  Scenario: Upsert a Cloud Cost Management tag description returns "No Content" response
+    Given new "UpsertCostTagDescriptionByKey" request
+    And request contains "tag_key" parameter from "REPLACE.ME"
+    And body with value {"data": {"attributes": {"cloud": "aws", "description": "AWS account that owns this cost."}, "id": "account_id", "type": "cost_tag_description"}}
+    When the request is sent
+    Then the response status is 204 No Content
+
   @generated @skip @team:DataDog/cloud-cost-management
   Scenario: Validate CSV budget returns "OK" response
     Given new "ValidateCsvBudget" request
diff --git a/tests/v2/features/undo.json b/tests/v2/features/undo.json
index c22b147298..5ef29b4d9b 100644
--- a/tests/v2/features/undo.json
+++ b/tests/v2/features/undo.json
@@ -1868,6 +1868,30 @@
       "type": "safe"
     }
   },
+  "DeleteCostTagDescriptionByKey": {
+    "tag": "Cloud Cost Management",
+    "undo": {
+      "type": "idempotent"
+    }
+  },
+  "GetCostTagDescriptionByKey": {
+    "tag": "Cloud Cost Management",
+    "undo": {
+      "type": "safe"
+    }
+  },
+  "UpsertCostTagDescriptionByKey": {
+    "tag": "Cloud Cost Management",
+    "undo": {
+      "type": "idempotent"
+    }
+  },
+  "GenerateCostTagDescriptionByKey": {
+    "tag": "Cloud Cost Management",
+    "undo": {
+      "type": "safe"
+    }
+  },
   "ListCostTagKeys": {
     "tag": "Cloud Cost Management",
     "undo": {