diff --git a/src/google/adk/tools/openapi_tool/openapi_spec_parser/openapi_spec_parser.py b/src/google/adk/tools/openapi_tool/openapi_spec_parser/openapi_spec_parser.py
index ac86cd05..64eb204f 100644
--- a/src/google/adk/tools/openapi_tool/openapi_spec_parser/openapi_spec_parser.py
+++ b/src/google/adk/tools/openapi_tool/openapi_spec_parser/openapi_spec_parser.py
@@ -111,6 +111,11 @@ class OpenApiSpecParser:
         if operation_dict is None:
           continue
 
+        # Append path-level parameters
+        operation_dict["parameters"] = operation_dict.get(
+            "parameters", []
+        ) + path_item.get("parameters", [])
+
         # If operation ID is missing, assign an operation id based on path
         # and method
         if "operationId" not in operation_dict:
diff --git a/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_spec_parser.py b/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_spec_parser.py
index 8fbee55f..053da759 100644
--- a/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_spec_parser.py
+++ b/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_spec_parser.py
@@ -624,3 +624,60 @@ def test_parse_spec_with_duplicate_parameter_names(openapi_spec_generator):
   assert body_param is not None
   assert body_param.original_name == "name"
   assert body_param.py_name == "name_0"
+
+
+def test_parse_spec_with_path_level_parameters(openapi_spec_generator):
+  """Test that operation parameters are correctly combined with path-level parameters."""
+  openapi_spec = {
+      "openapi": "3.1.0",
+      "info": {"title": "Combine Parameters API", "version": "1.0.0"},
+      "paths": {
+          "/test": {
+              "parameters": [{
+                  "name": "global_param",
+                  "in": "query",
+                  "schema": {"type": "string"},
+              }],
+              "get": {
+                  "parameters": [{
+                      "name": "local_param",
+                      "in": "header",
+                      "schema": {"type": "integer"},
+                  }],
+                  "operationId": "testGet",
+                  "responses": {
+                      "200": {
+                          "description": "Successful response",
+                          "content": {
+                              "application/json": {"schema": {"type": "string"}}
+                          },
+                      }
+                  },
+              },
+          }
+      },
+  }
+
+  parsed_operations = openapi_spec_generator.parse(openapi_spec)
+  assert len(parsed_operations) == 1
+
+  operation = parsed_operations[0]
+  assert len(operation.parameters) == 2
+
+  # Verify the combined parameters
+  global_param = next(
+      (p for p in operation.parameters if p.original_name == "global_param"),
+      None,
+  )
+  local_param = next(
+      (p for p in operation.parameters if p.original_name == "local_param"),
+      None,
+  )
+
+  assert global_param is not None
+  assert global_param.param_location == "query"
+  assert global_param.type_value is str
+
+  assert local_param is not None
+  assert local_param.param_location == "header"
+  assert local_param.type_value is int
diff --git a/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_toolset.py b/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_toolset.py
index fdb6d201..2b95e461 100644
--- a/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_toolset.py
+++ b/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_openapi_toolset.py
@@ -95,7 +95,7 @@ def test_openapi_toolset_tool_existing(openapi_spec: Dict):
   assert tool.is_long_running is False
   assert tool.operation.operationId == "calendar.calendars.get"
   assert tool.operation.description == "Returns metadata for a calendar."
-  assert len(tool.operation.parameters) == 1
+  assert len(tool.operation.parameters) == 8
   assert tool.operation.parameters[0].name == "calendarId"
   assert tool.operation.parameters[0].in_ == ParameterInType.path
   assert tool.operation.parameters[0].required is True