fix: Add tool_name_prefix support to OpenAPIToolset

Fixes: https://github.com/google/adk-python/issues/3779

Co-authored-by: Xuan Yang <xygoogle@google.com>
PiperOrigin-RevId: 841850614

src/google/adk/tools/openapi_tool/openapi_spec_parser/openapi_toolset.py

@@ -69,6 +69,7 @@ class OpenAPIToolset(BaseToolset):
       auth_scheme: Optional[AuthScheme] = None,
       auth_credential: Optional[AuthCredential] = None,
       tool_filter: Optional[Union[ToolPredicate, List[str]]] = None,
+      tool_name_prefix: Optional[str] = None,
       ssl_verify: Optional[Union[bool, str, ssl.SSLContext]] = None,
   ):
     """Initializes the OpenAPIToolset.
@@ -104,6 +105,9 @@ class OpenAPIToolset(BaseToolset):
         ``google.adk.tools.openapi_tool.auth.auth_helpers``
       tool_filter: The filter used to filter the tools in the toolset. It can be
         either a tool predicate or a list of tool names of the tools to expose.
+      tool_name_prefix: The prefix to prepend to the names of the tools returned
+        by the toolset. Useful when multiple OpenAPI specs have tools with
+        similar names.
       ssl_verify: SSL certificate verification option for all tools. Can be:
         - None: Use default verification (True)
         - True: Verify SSL certificates using system CA
@@ -113,7 +117,7 @@ class OpenAPIToolset(BaseToolset):
         This is useful for enterprise environments where requests go through
         a TLS-intercepting proxy with a custom CA certificate.
     """
-    super().__init__(tool_filter=tool_filter)
+    super().__init__(tool_filter=tool_filter, tool_name_prefix=tool_name_prefix)
     if not spec_dict:
       spec_dict = self._load_spec(spec_str, spec_str_type)
     self._ssl_verify = ssl_verify

tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_toolset.py

@@ -169,3 +169,24 @@ def test_openapi_toolset_configure_verify_all(openapi_spec: Dict[str, Any]):
 
   for tool in toolset._tools:
     assert tool._ssl_verify == ca_bundle_path
+
+
+async def test_openapi_toolset_tool_name_prefix(openapi_spec: Dict[str, Any]):
+  """Test tool_name_prefix parameter prefixes tool names."""
+  prefix = "my_api"
+  toolset = OpenAPIToolset(spec_dict=openapi_spec, tool_name_prefix=prefix)
+
+  # Verify the toolset has the prefix set
+  assert toolset.tool_name_prefix == prefix
+
+  prefixed_tools = await toolset.get_tools_with_prefix()
+  assert len(prefixed_tools) == 5
+
+  # Verify all tool names are prefixed
+  for tool in prefixed_tools:
+    assert tool.name.startswith(f"{prefix}_")
+
+  # Verify specific tool name is prefixed
+  expected_prefixed_name = "my_api_calendar_calendars_insert"
+  prefixed_tool_names = [t.name for t in prefixed_tools]
+  assert expected_prefixed_name in prefixed_tool_names