fix(openai): avoid mutating raw tool schemas for Responses

livekit-agents/livekit/agents/llm/_provider_format/openai.py

@@ -236,8 +236,7 @@ def to_responses_fnc_ctx(
     schemas: list[dict[str, Any]] = []
     for tool in tool_ctx.flatten():
         if isinstance(tool, llm.RawFunctionTool):
-            schema = tool.info.raw_schema
-            schema["type"] = "function"
+            schema = {**tool.info.raw_schema, "type": "function"}
             schemas.append(schema)
         elif isinstance(tool, llm.FunctionTool):
             schema = llm.utils.build_legacy_openai_schema(tool, internally_tagged=True)

tests/test_tools.py

@@ -189,6 +189,23 @@ def test_copy_equals_original(self):
         ctx2 = ctx1.copy()
         assert ctx1 == ctx2
 
+    def test_openai_responses_raw_schema_does_not_mutate_tool_schema(self):
+        ctx = ToolContext([raw_tool_1])
+        raw_schema = raw_tool_1.info.raw_schema.copy()
+
+        responses_tools = ctx.parse_function_tools("openai.responses")
+
+        assert responses_tools[0]["type"] == "function"
+        assert raw_tool_1.info.raw_schema == raw_schema
+        assert "type" not in raw_tool_1.info.raw_schema
+
+        chat_tools = ctx.parse_function_tools("openai")
+        assert chat_tools[0] == {
+            "type": "function",
+            "function": raw_tool_1.info.raw_schema,
+        }
+        assert "type" not in chat_tools[0]["function"]
+
     def test_update_tools_changes_equality(self):
         ctx1 = ToolContext([mock_tool_1])
         ctx2 = ToolContext([mock_tool_1])