diff --git a/google/genai/_live_converters.py b/google/genai/_live_converters.py
index d1bb8df03..82a127fcd 100644
--- a/google/genai/_live_converters.py
+++ b/google/genai/_live_converters.py
@@ -252,6 +252,26 @@ def _GoogleSearchRetrieval_to_vertex(
   return to_object
 
 
+def _EnterpriseWebSearch_to_mldev(
+    api_client: BaseApiClient,
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+  to_object: dict[str, Any] = {}
+
+  return to_object
+
+
+def _EnterpriseWebSearch_to_vertex(
+    api_client: BaseApiClient,
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+  to_object: dict[str, Any] = {}
+
+  return to_object
+
+
 def _Tool_to_mldev(
     api_client: BaseApiClient,
     from_object: Union[dict[str, Any], object],
@@ -281,6 +301,11 @@ def _Tool_to_mldev(
         ),
     )
 
+  if getv(from_object, ['enterprise_web_search']) is not None:
+    raise ValueError(
+        'enterprise_web_search parameter is not supported in Gemini API.'
+    )
+
   if getv(from_object, ['code_execution']) is not None:
     setv(to_object, ['codeExecution'], getv(from_object, ['code_execution']))
 
@@ -323,6 +348,15 @@ def _Tool_to_vertex(
         ),
     )
 
+  if getv(from_object, ['enterprise_web_search']) is not None:
+    setv(
+        to_object,
+        ['enterpriseWebSearch'],
+        _EnterpriseWebSearch_to_vertex(
+            api_client, getv(from_object, ['enterprise_web_search']), to_object
+        ),
+    )
+
   if getv(from_object, ['code_execution']) is not None:
     setv(to_object, ['codeExecution'], getv(from_object, ['code_execution']))
 
diff --git a/google/genai/caches.py b/google/genai/caches.py
index ddb564f6a..2336c698d 100644
--- a/google/genai/caches.py
+++ b/google/genai/caches.py
@@ -145,6 +145,16 @@ def _GoogleSearchRetrieval_to_mldev(
   return to_object
 
 
+def _EnterpriseWebSearch_to_mldev(
+    api_client: BaseApiClient,
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+  to_object: dict[str, Any] = {}
+
+  return to_object
+
+
 def _Tool_to_mldev(
     api_client: BaseApiClient,
     from_object: Union[dict[str, Any], object],
@@ -174,6 +184,11 @@ def _Tool_to_mldev(
         ),
     )
 
+  if getv(from_object, ['enterprise_web_search']) is not None:
+    raise ValueError(
+        'enterprise_web_search parameter is not supported in Gemini API.'
+    )
+
   if getv(from_object, ['code_execution']) is not None:
     setv(to_object, ['codeExecution'], getv(from_object, ['code_execution']))
 
@@ -546,6 +561,16 @@ def _GoogleSearchRetrieval_to_vertex(
   return to_object
 
 
+def _EnterpriseWebSearch_to_vertex(
+    api_client: BaseApiClient,
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+  to_object: dict[str, Any] = {}
+
+  return to_object
+
+
 def _Tool_to_vertex(
     api_client: BaseApiClient,
     from_object: Union[dict[str, Any], object],
@@ -575,6 +600,15 @@ def _Tool_to_vertex(
         ),
     )
 
+  if getv(from_object, ['enterprise_web_search']) is not None:
+    setv(
+        to_object,
+        ['enterpriseWebSearch'],
+        _EnterpriseWebSearch_to_vertex(
+            api_client, getv(from_object, ['enterprise_web_search']), to_object
+        ),
+    )
+
   if getv(from_object, ['code_execution']) is not None:
     setv(to_object, ['codeExecution'], getv(from_object, ['code_execution']))
 
diff --git a/google/genai/models.py b/google/genai/models.py
index 575ad8e2d..b72dca772 100644
--- a/google/genai/models.py
+++ b/google/genai/models.py
@@ -178,6 +178,16 @@ def _GoogleSearchRetrieval_to_mldev(
   return to_object
 
 
+def _EnterpriseWebSearch_to_mldev(
+    api_client: BaseApiClient,
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+  to_object: dict[str, Any] = {}
+
+  return to_object
+
+
 def _Tool_to_mldev(
     api_client: BaseApiClient,
     from_object: Union[dict[str, Any], object],
@@ -207,6 +217,11 @@ def _Tool_to_mldev(
         ),
     )
 
+  if getv(from_object, ['enterprise_web_search']) is not None:
+    raise ValueError(
+        'enterprise_web_search parameter is not supported in Gemini API.'
+    )
+
   if getv(from_object, ['code_execution']) is not None:
     setv(to_object, ['codeExecution'], getv(from_object, ['code_execution']))
 
@@ -1189,6 +1204,16 @@ def _GoogleSearchRetrieval_to_vertex(
   return to_object
 
 
+def _EnterpriseWebSearch_to_vertex(
+    api_client: BaseApiClient,
+    from_object: Union[dict[str, Any], object],
+    parent_object: Optional[dict[str, Any]] = None,
+) -> dict[str, Any]:
+  to_object: dict[str, Any] = {}
+
+  return to_object
+
+
 def _Tool_to_vertex(
     api_client: BaseApiClient,
     from_object: Union[dict[str, Any], object],
@@ -1218,6 +1243,15 @@ def _Tool_to_vertex(
         ),
     )
 
+  if getv(from_object, ['enterprise_web_search']) is not None:
+    setv(
+        to_object,
+        ['enterpriseWebSearch'],
+        _EnterpriseWebSearch_to_vertex(
+            api_client, getv(from_object, ['enterprise_web_search']), to_object
+        ),
+    )
+
   if getv(from_object, ['code_execution']) is not None:
     setv(to_object, ['codeExecution'], getv(from_object, ['code_execution']))
 
diff --git a/google/genai/types.py b/google/genai/types.py
index 5cff033b3..5070ca960 100644
--- a/google/genai/types.py
+++ b/google/genai/types.py
@@ -998,6 +998,21 @@ class GoogleSearchRetrievalDict(TypedDict, total=False):
 ]
 
 
+class EnterpriseWebSearch(_common.BaseModel):
+  """Tool to search public web data, powered by Vertex AI Search and Sec4 compliance."""
+
+  pass
+
+
+class EnterpriseWebSearchDict(TypedDict, total=False):
+  """Tool to search public web data, powered by Vertex AI Search and Sec4 compliance."""
+
+  pass
+
+
+EnterpriseWebSearchOrDict = Union[EnterpriseWebSearch, EnterpriseWebSearchDict]
+
+
 class VertexAISearch(_common.BaseModel):
   """Retrieve from Vertex AI Search datastore or engine for grounding.
 
@@ -2120,6 +2135,11 @@ class Tool(_common.BaseModel):
       default=None,
       description="""Optional. GoogleSearchRetrieval tool type. Specialized retrieval tool that is powered by Google search.""",
   )
+  enterprise_web_search: Optional[EnterpriseWebSearch] = Field(
+      default=None,
+      description="""Optional. Enterprise web search tool type. Specialized retrieval
+      tool that is powered by Vertex AI Search and Sec4 compliance.""",
+  )
   code_execution: Optional[ToolCodeExecution] = Field(
       default=None,
       description="""Optional. CodeExecution tool type. Enables the model to execute code as part of generation. This field is only used by the Gemini Developer API services.""",
@@ -2143,6 +2163,10 @@ class ToolDict(TypedDict, total=False):
   google_search_retrieval: Optional[GoogleSearchRetrievalDict]
   """Optional. GoogleSearchRetrieval tool type. Specialized retrieval tool that is powered by Google search."""
 
+  enterprise_web_search: Optional[EnterpriseWebSearchDict]
+  """Optional. Enterprise web search tool type. Specialized retrieval
+      tool that is powered by Vertex AI Search and Sec4 compliance."""
+
   code_execution: Optional[ToolCodeExecutionDict]
   """Optional. CodeExecution tool type. Enables the model to execute code as part of generation. This field is only used by the Gemini Developer API services."""