Add thread message delete operation (#41625)

* Demonstrate the include parameter usage. (#41523)

* Demonstrate the include parameter usage

* Enable tests for reference text inclusion.

* Add file search with streaming samples (#41551)

* Small fix and use projects for getting connection ID (#41576)

* Update readme (#41527)

* Update readme

* Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>

* update

* Takes Jarno recommendation

---------

Co-authored-by: Copilot <[email protected]>

* Howie/next lint (#41621)

* Fix pylintrc to exclude agents generated code (#41612)

* Fix pylintrc to exclude agents generated code

* Update pylintrc

Co-authored-by: Copilot <[email protected]>

* Resolved

* Update eng/pylintrc

* Update pylintrc

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: Libba Lawrence <[email protected]>

* Fix lint

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: Libba Lawrence <[email protected]>

* Add thread message delete operation

* Re generate code

* Merge to upstream

* Revert "Merge to upstream"

This reverts commit 8b157e1.

* Generate code from main branch

---------

Co-authored-by: Howie Leung <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: Libba Lawrence <[email protected]>

Author: 4 people

sdk/ai/azure-ai-agents/CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### Features Added
 
+- Added delete operation for `ThreadMessages`.
 - Add `RunStepDetailsActivity`, describing MCP function parameters.
 - Add `RunStepDeltaCustomBingGroundingToolCall`, describing `BingCustomSearchTool` updates in streaming scenario.
 
@@ -16,6 +17,8 @@
 
 ### Sample updates
 
+- The file search samples were updated to demonstrate retrieving text associated with citations.
+- Added samples for file search citation with streaming.
 - Bing Grounding and Bing Custom Search samples were fixed to correctly present references.
 
 ## 1.2.0b2 (2025-08-12)

sdk/ai/azure-ai-agents/assets.json

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "python",
   "TagPrefix": "python/ai/azure-ai-agents",
-  "Tag": "python/ai/azure-ai-agents_56f374c86c"
+  "Tag": "python/ai/azure-ai-agents_3c8c500083"
 }

sdk/ai/azure-ai-agents/azure/ai/agents/_validation.py

@@ -0,0 +1,66 @@
+# --------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# Code generated by Microsoft (R) Python Code Generator.
+# Changes may cause incorrect behavior and will be lost if the code is regenerated.
+# --------------------------------------------------------------------------
+import functools
+
+
+def api_version_validation(**kwargs):
+    params_added_on = kwargs.pop("params_added_on", {})
+    method_added_on = kwargs.pop("method_added_on", "")
+    api_versions_list = kwargs.pop("api_versions_list", [])
+
+    def _index_with_default(value: str, default: int = -1) -> int:
+        """Get the index of value in lst, or return default if not found.
+
+        :param value: The value to search for in the api_versions_list.
+        :type value: str
+        :param default: The default value to return if the value is not found.
+        :type default: int
+        :return: The index of the value in the list, or the default value if not found.
+        :rtype: int
+        """
+        try:
+            return api_versions_list.index(value)
+        except ValueError:
+            return default
+
+    def decorator(func):
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            try:
+                # this assumes the client has an _api_version attribute
+                client = args[0]
+                client_api_version = client._config.api_version  # pylint: disable=protected-access
+            except AttributeError:
+                return func(*args, **kwargs)
+
+            if _index_with_default(method_added_on) > _index_with_default(client_api_version):
+                raise ValueError(
+                    f"'{func.__name__}' is not available in API version "
+                    f"{client_api_version}. Pass service API version {method_added_on} or newer to your client."
+                )
+
+            unsupported = {
+                parameter: api_version
+                for api_version, parameters in params_added_on.items()
+                for parameter in parameters
+                if parameter in kwargs and _index_with_default(api_version) > _index_with_default(client_api_version)
+            }
+            if unsupported:
+                raise ValueError(
+                    "".join(
+                        [
+                            f"'{param}' is not available in API version {client_api_version}. "
+                            f"Use service API version {version} or newer.\n"
+                            for param, version in unsupported.items()
+                        ]
+                    )
+                )
+            return func(*args, **kwargs)
+
+        return wrapper
+
+    return decorator

sdk/ai/azure-ai-agents/azure/ai/agents/aio/operations/_operations.py

@@ -34,6 +34,7 @@
 from ..._utils.model_base import Model as _Model, SdkJSONEncoder, _deserialize, _failsafe_deserialize
 from ..._utils.serialization import Deserializer, Serializer
 from ..._utils.utils import ClientMixinABC, prepare_multipart_form_data
+from ..._validation import api_version_validation
 from ...operations._operations import (
     build_agents_create_agent_request,
     build_agents_create_thread_and_run_request,
@@ -47,6 +48,7 @@
     build_files_list_request,
     build_files_upload_file_request,
     build_messages_create_request,
+    build_messages_delete_request,
     build_messages_get_request,
     build_messages_list_request,
     build_messages_update_request,
@@ -1151,6 +1153,77 @@ async def update(
 
         return deserialized  # type: ignore
 
+    @distributed_trace_async
+    @api_version_validation(
+        method_added_on="v1",
+        params_added_on={"v1": ["api_version", "thread_id", "message_id", "accept"]},
+        api_versions_list=["v1", "2025-05-15-preview"],
+    )
+    async def _delete(self, thread_id: str, message_id: str, **kwargs: Any) -> _models._models.MessageDeletionStatus:
+        """Deletes an existing message on an existing thread.
+
+        :param thread_id: Identifier of the thread. Required.
+        :type thread_id: str
+        :param message_id: Identifier of the message. Required.
+        :type message_id: str
+        :return: MessageDeletionStatus. The MessageDeletionStatus is compatible with MutableMapping
+        :rtype: ~azure.ai.agents.models._models.MessageDeletionStatus
+        :raises ~azure.core.exceptions.HttpResponseError:
+        """
+        error_map: MutableMapping = {
+            401: ClientAuthenticationError,
+            404: ResourceNotFoundError,
+            409: ResourceExistsError,
+            304: ResourceNotModifiedError,
+        }
+        error_map.update(kwargs.pop("error_map", {}) or {})
+
+        _headers = kwargs.pop("headers", {}) or {}
+        _params = kwargs.pop("params", {}) or {}
+
+        cls: ClsType[_models._models.MessageDeletionStatus] = kwargs.pop("cls", None)
+
+        _request = build_messages_delete_request(
+            thread_id=thread_id,
+            message_id=message_id,
+            api_version=self._config.api_version,
+            headers=_headers,
+            params=_params,
+        )
+        path_format_arguments = {
+            "endpoint": self._serialize.url("self._config.endpoint", self._config.endpoint, "str", skip_quote=True),
+        }
+        _request.url = self._client.format_url(_request.url, **path_format_arguments)
+
+        _stream = kwargs.pop("stream", False)
+        pipeline_response: PipelineResponse = await self._client._pipeline.run(  # pylint: disable=protected-access
+            _request, stream=_stream, **kwargs
+        )
+
+        response = pipeline_response.http_response
+
+        if response.status_code not in [200]:
+            if _stream:
+                try:
+                    await response.read()  # Load the body in memory and close the socket
+                except (StreamConsumedError, StreamClosedError):
+                    pass
+            map_error(status_code=response.status_code, response=response, error_map=error_map)
+            error = _failsafe_deserialize(_models.AgentV1Error, response)
+            raise HttpResponseError(response=response, model=error)
+
+        if _stream:
+            deserialized = response.iter_bytes()
+        else:
+            deserialized = _deserialize(
+                _models._models.MessageDeletionStatus, response.json()  # pylint: disable=protected-access
+            )
+
+        if cls:
+            return cls(pipeline_response, deserialized, {})  # type: ignore
+
+        return deserialized  # type: ignore
+
 
 class RunsOperations:
     """

sdk/ai/azure-ai-agents/azure/ai/agents/aio/operations/_patch.py

@@ -2335,6 +2335,18 @@ async def get_last_message_text_by_role(
                 return text_contents[-1]
         return None
 
+    @distributed_trace_async
+    async def delete(self, thread_id: str, message_id: str, **kwargs: Any) -> None:
+        """Deletes an existing message on an existing thread.
+
+        :param thread_id: Identifier of the thread. Required.
+        :type thread_id: str
+        :param message_id: Identifier of the message. Required.
+        :type message_id: str
+        :raises ~azure.core.exceptions.HttpResponseError:
+        """
+        await super()._delete(thread_id=thread_id, message_id=message_id, **kwargs)
+
 
 __all__: List[str] = [
     "MessagesOperations",

sdk/ai/azure-ai-agents/azure/ai/agents/models/_models.py

@@ -2305,6 +2305,46 @@ def __init__(self, *args: Any, **kwargs: Any) -> None:
         super().__init__(*args, **kwargs)
 
 
+class MessageDeletionStatus(_Model):
+    """The status of a thread message deletion operation.
+
+    :ivar id: The ID of the resource specified for deletion. Required.
+    :vartype id: str
+    :ivar deleted: A value indicating whether deletion was successful. Required.
+    :vartype deleted: bool
+    :ivar object: The object type, which is always 'thread.message.deleted'. Required. Default
+     value is "thread.message.deleted".
+    :vartype object: str
+    """
+
+    id: str = rest_field(visibility=["read", "create", "update", "delete", "query"])
+    """The ID of the resource specified for deletion. Required."""
+    deleted: bool = rest_field(visibility=["read", "create", "update", "delete", "query"])
+    """A value indicating whether deletion was successful. Required."""
+    object: Literal["thread.message.deleted"] = rest_field(visibility=["read", "create", "update", "delete", "query"])
+    """The object type, which is always 'thread.message.deleted'. Required. Default value is
+     \"thread.message.deleted\"."""
+
+    @overload
+    def __init__(
+        self,
+        *,
+        id: str,  # pylint: disable=redefined-builtin
+        deleted: bool,
+    ) -> None: ...
+
+    @overload
+    def __init__(self, mapping: Mapping[str, Any]) -> None:
+        """
+        :param mapping: raw JSON to initialize the model.
+        :type mapping: Mapping[str, Any]
+        """
+
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        super().__init__(*args, **kwargs)
+        self.object: Literal["thread.message.deleted"] = "thread.message.deleted"
+
+
 class MessageDelta(_Model):
     """Represents the typed 'delta' payload within a streaming message delta chunk.
 

sdk/ai/azure-ai-agents/azure/ai/agents/operations/_operations.py

@@ -34,6 +34,7 @@
 from .._utils.model_base import Model as _Model, SdkJSONEncoder, _deserialize, _failsafe_deserialize
 from .._utils.serialization import Deserializer, Serializer
 from .._utils.utils import ClientMixinABC, prepare_multipart_form_data
+from .._validation import api_version_validation
 
 if TYPE_CHECKING:
     from .. import _types
@@ -300,6 +301,31 @@ def build_messages_update_request(thread_id: str, message_id: str, **kwargs: Any
     return HttpRequest(method="POST", url=_url, params=_params, headers=_headers, **kwargs)
 
 
+def build_messages_delete_request(thread_id: str, message_id: str, **kwargs: Any) -> HttpRequest:
+    _headers = case_insensitive_dict(kwargs.pop("headers", {}) or {})
+    _params = case_insensitive_dict(kwargs.pop("params", {}) or {})
+
+    api_version: str = kwargs.pop("api_version", _params.pop("api-version", "2025-05-15-preview"))
+    accept = _headers.pop("Accept", "application/json")
+
+    # Construct URL
+    _url = "/threads/{threadId}/messages/{messageId}"
+    path_format_arguments = {
+        "threadId": _SERIALIZER.url("thread_id", thread_id, "str"),
+        "messageId": _SERIALIZER.url("message_id", message_id, "str"),
+    }
+
+    _url: str = _url.format(**path_format_arguments)  # type: ignore
+
+    # Construct parameters
+    _params["api-version"] = _SERIALIZER.query("api_version", api_version, "str")
+
+    # Construct headers
+    _headers["Accept"] = _SERIALIZER.header("accept", accept, "str")
+
+    return HttpRequest(method="DELETE", url=_url, params=_params, headers=_headers, **kwargs)
+
+
 def build_runs_create_request(
     thread_id: str, *, include: Optional[List[Union[str, _models.RunAdditionalFieldList]]] = None, **kwargs: Any
 ) -> HttpRequest:
@@ -2269,6 +2295,77 @@ def update(
 
         return deserialized  # type: ignore
 
+    @distributed_trace
+    @api_version_validation(
+        method_added_on="v1",
+        params_added_on={"v1": ["api_version", "thread_id", "message_id", "accept"]},
+        api_versions_list=["v1", "2025-05-15-preview"],
+    )
+    def _delete(self, thread_id: str, message_id: str, **kwargs: Any) -> _models._models.MessageDeletionStatus:
+        """Deletes an existing message on an existing thread.
+
+        :param thread_id: Identifier of the thread. Required.
+        :type thread_id: str
+        :param message_id: Identifier of the message. Required.
+        :type message_id: str
+        :return: MessageDeletionStatus. The MessageDeletionStatus is compatible with MutableMapping
+        :rtype: ~azure.ai.agents.models._models.MessageDeletionStatus
+        :raises ~azure.core.exceptions.HttpResponseError:
+        """
+        error_map: MutableMapping = {
+            401: ClientAuthenticationError,
+            404: ResourceNotFoundError,
+            409: ResourceExistsError,
+            304: ResourceNotModifiedError,
+        }
+        error_map.update(kwargs.pop("error_map", {}) or {})
+
+        _headers = kwargs.pop("headers", {}) or {}
+        _params = kwargs.pop("params", {}) or {}
+
+        cls: ClsType[_models._models.MessageDeletionStatus] = kwargs.pop("cls", None)
+
+        _request = build_messages_delete_request(
+            thread_id=thread_id,
+            message_id=message_id,
+            api_version=self._config.api_version,
+            headers=_headers,
+            params=_params,
+        )
+        path_format_arguments = {
+            "endpoint": self._serialize.url("self._config.endpoint", self._config.endpoint, "str", skip_quote=True),
+        }
+        _request.url = self._client.format_url(_request.url, **path_format_arguments)
+
+        _stream = kwargs.pop("stream", False)
+        pipeline_response: PipelineResponse = self._client._pipeline.run(  # pylint: disable=protected-access
+            _request, stream=_stream, **kwargs
+        )
+
+        response = pipeline_response.http_response
+
+        if response.status_code not in [200]:
+            if _stream:
+                try:
+                    response.read()  # Load the body in memory and close the socket
+                except (StreamConsumedError, StreamClosedError):
+                    pass
+            map_error(status_code=response.status_code, response=response, error_map=error_map)
+            error = _failsafe_deserialize(_models.AgentV1Error, response)
+            raise HttpResponseError(response=response, model=error)
+
+        if _stream:
+            deserialized = response.iter_bytes()
+        else:
+            deserialized = _deserialize(
+                _models._models.MessageDeletionStatus, response.json()  # pylint: disable=protected-access
+            )
+
+        if cls:
+            return cls(pipeline_response, deserialized, {})  # type: ignore
+
+        return deserialized  # type: ignore
+
 
 class RunsOperations:
     """

sdk/ai/azure-ai-agents/azure/ai/agents/operations/_patch.py

@@ -2334,6 +2334,18 @@ def get_last_message_text_by_role(
                 return text_contents[-1]
         return None
 
+    @distributed_trace
+    def delete(self, thread_id: str, message_id: str, **kwargs: Any) -> None:
+        """Deletes an existing message on an existing thread.
+
+        :param thread_id: Identifier of the thread. Required.
+        :type thread_id: str
+        :param message_id: Identifier of the message. Required.
+        :type message_id: str
+        :raises ~azure.core.exceptions.HttpResponseError:
+        """
+        super()._delete(thread_id=thread_id, message_id=message_id, **kwargs)
+
 
 __all__: List[str] = [
     "ThreadsOperations",

sdk/ai/azure-ai-agents/setup.py

@@ -77,4 +77,4 @@
         "typing-extensions>=4.6.0",
     ],
     python_requires=">=3.9",
-)
+)