Remove unsupported container tool references from structural tag code

The container tool was referenced in the structural tag implementation but
ToolNamespaceConfig.container() does not exist in the openai_harmony library,
which would cause AttributeError at runtime if the container tool was used.

Changes:
- Remove container tool handling from from_builtin_tool_to_tag() in gptoss_reasoning_parser.py
- Remove enable_container logic from serving_responses.py
- Update tests to remove container tool test cases
- Keep all structural tag improvements for browser and python tools

The container tool support was originally added in PR vllm-project#23386 but the
openai_harmony library never implemented ToolNamespaceConfig.container().
This commit removes only the non-functional container references while
preserving all working functionality.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: titanous

tests/entrypoints/openai/test_gptoss_structural_tags_integration.py

@@ -107,20 +107,18 @@ def test_structured_outputs_params_integration(
         assert parsed_tag["type"] == "structural_tag"
 
     @pytest.mark.parametrize(
-        "browser, python, container, expected_tags",
+        "browser, python, expected_tags",
         [
             # No tools
-            (False, False, False, 1),
+            (False, False, 1),
             # Browser only: 3 functions × 2 channels + 1 analysis = 7
-            (True, False, False, 7),
+            (True, False, 7),
             # Browser + Python: 6 + 2 + 1 analysis = 9
-            (True, True, False, 9),
-            # All tools: 6 (browser) + 2 (python) + 2 (container) + 1 (analysis) = 11
-            (True, True, True, 11),
+            (True, True, 9),
         ],
     )
     def test_tool_server_interaction_flow(
-        self, gptoss_parser, browser, python, container, expected_tags
+        self, gptoss_parser, browser, python, expected_tags
     ):
         """Test the complete tool server interaction flow."""
 
@@ -132,7 +130,6 @@ def test_tool_server_interaction_flow(
             side_effect=lambda tool: {
                 "browser": browser,
                 "python": python,
-                "container": container,
             }.get(tool, False)
         )
 
@@ -152,8 +149,6 @@ def test_tool_server_interaction_flow(
             assert any("to=browser.find" in begin for begin in tag_begins)
         if python:
             assert any("to=python<|channel|>" in begin for begin in tag_begins)
-        if container:
-            assert any("to=container<|channel|>" in begin for begin in tag_begins)
 
     def test_original_tag_preservation(self, gptoss_parser, tool_server_with_python):
         """Test that original tags are preserved when provided."""
@@ -172,11 +167,7 @@ def test_original_tag_preservation(self, gptoss_parser, tool_server_with_python)
             [],
             ["browser"],
             ["python"],
-            ["container"],
             ["browser", "python"],
-            ["browser", "container"],
-            ["python", "container"],
-            ["browser", "python", "container"],
         ],
     )
     def test_json_validity_comprehensive(self, gptoss_parser, tools):

vllm/entrypoints/openai/serving_responses.py

@@ -920,11 +920,6 @@ def _construct_harmony_system_input_message(
             and self.tool_server is not None
             and self.tool_server.has_tool("python")
         )
-        enable_container = (
-            "container" in tool_types
-            and self.tool_server is not None
-            and self.tool_server.has_tool("container")
-        )
         sys_msg = get_system_message(
             reasoning_effort=reasoning_effort,
             browser_description=(
@@ -937,11 +932,6 @@ def _construct_harmony_system_input_message(
                 if enable_code_interpreter and self.tool_server is not None
                 else None
             ),
-            container_description=(
-                self.tool_server.get_tool_description("container")
-                if enable_container and self.tool_server is not None
-                else None
-            ),
             instructions=request.instructions,
             with_custom_tools=with_custom_tools,
         )

vllm/reasoning/gptoss_reasoning_parser.py

@@ -34,7 +34,7 @@ def from_builtin_tool_to_tag(tool: str) -> list[dict]:
     """Generate structural tags for a builtin tool with proper JSON schemas.
 
     Args:
-        tool: Tool name (e.g., "browser", "python", "container")
+        tool: Tool name (e.g., "browser", "python")
 
     Returns:
         List of tag dictionaries with correct Harmony format patterns and schemas
@@ -46,8 +46,6 @@ def from_builtin_tool_to_tag(tool: str) -> list[dict]:
         config = ToolNamespaceConfig.browser()
     elif tool == "python":
         config = ToolNamespaceConfig.python()
-    elif tool == "container":
-        config = ToolNamespaceConfig.container()
     else:
         config = None