diff --git a/tests/integration/translation/messages/params/__init__.py b/tests/integration/translation/messages/params/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/integration/translation/messages/params/test_messages_params_tool_choice.py b/tests/integration/translation/messages/params/test_messages_params_tool_choice.py
new file mode 100644
index 00000000000..5a2781f373a
--- /dev/null
+++ b/tests/integration/translation/messages/params/test_messages_params_tool_choice.py
@@ -0,0 +1,97 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.messages.bases.azure import GPT_6_LUNA_TEST_CASE as AZURE_GPT_6_LUNA_TEST_CASE
+from integration.translation.messages.bases.bedrock_converse import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.messages.bases.openai import GPT_5_4_TEST_CASE as OPENAI_GPT_5_4_TEST_CASE
+from integration.translation.runner import assert_translation
+from pydantic import JsonValue
+
+LOOKUP_SCHEMA: Final[dict[str, JsonValue]] = {
+    "type": "object",
+    "properties": {"city": {"type": "string"}},
+    "required": ["city"],
+}
+ANTHROPIC_TOOLS: Final[list[JsonValue]] = [
+    {"name": "lookup_weather", "description": "Look up the weather for a city.", "input_schema": LOOKUP_SCHEMA}
+]
+RESPONSES_TOOLS: Final[list[JsonValue]] = [
+    {
+        "type": "function",
+        "name": "lookup_weather",
+        "strict": False,
+        "description": "Look up the weather for a city.",
+        "parameters": LOOKUP_SCHEMA,
+    }
+]
+BEDROCK_TOOL_CONFIG: Final[dict[str, JsonValue]] = {
+    "tools": [
+        {
+            "toolSpec": {
+                "name": "lookup_weather",
+                "description": "Look up the weather for a city.",
+                "inputSchema": {"json": LOOKUP_SCHEMA},
+            }
+        }
+    ],
+    "toolChoice": {"auto": {}},
+}
+DISABLE_PARALLEL_TOOL_USE: Final[dict[str, JsonValue]] = {"type": "auto", "disable_parallel_tool_use": True}
+SCENARIO: Final = "tool_choice_disable_parallel_tool_use"
+
+OPENAI_GPT_5_4_DISABLE_PARALLEL_TEST_CASE: Final = replace(
+    OPENAI_GPT_5_4_TEST_CASE,
+    scenario=SCENARIO,
+    litellm_request={
+        **OPENAI_GPT_5_4_TEST_CASE.litellm_request,
+        "tools": ANTHROPIC_TOOLS,
+        "tool_choice": DISABLE_PARALLEL_TOOL_USE,
+    },
+    expected_provider_request={
+        **OPENAI_GPT_5_4_TEST_CASE.expected_provider_request,
+        "tools": RESPONSES_TOOLS,
+        "tool_choice": "auto",
+        "parallel_tool_calls": False,
+    },
+)
+
+AZURE_GPT_6_LUNA_DISABLE_PARALLEL_TEST_CASE: Final = replace(
+    AZURE_GPT_6_LUNA_TEST_CASE,
+    scenario=SCENARIO,
+    litellm_request={**AZURE_GPT_6_LUNA_TEST_CASE.litellm_request, "tool_choice": DISABLE_PARALLEL_TOOL_USE},
+    expected_provider_request={
+        **AZURE_GPT_6_LUNA_TEST_CASE.expected_provider_request,
+        "tool_choice": "auto",
+        "parallel_tool_calls": False,
+    },
+)
+
+CLAUDE_SONNET_4_6_DISABLE_PARALLEL_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario=SCENARIO,
+    litellm_request={
+        **CLAUDE_SONNET_4_6_TEST_CASE.litellm_request,
+        "tools": ANTHROPIC_TOOLS,
+        "tool_choice": DISABLE_PARALLEL_TOOL_USE,
+    },
+    expected_provider_request={
+        **CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request,
+        "toolConfig": BEDROCK_TOOL_CONFIG,
+        "additionalModelRequestFields": {"tool_choice": {"disable_parallel_tool_use": True}},
+    },
+)
+
+CASES: Final = (
+    OPENAI_GPT_5_4_DISABLE_PARALLEL_TEST_CASE,
+    AZURE_GPT_6_LUNA_DISABLE_PARALLEL_TEST_CASE,
+    CLAUDE_SONNET_4_6_DISABLE_PARALLEL_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_messages_params_tool_choice(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)