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

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