diff --git a/tests/e2e/llm_translation/test_together_ai_e2e.py b/tests/e2e/llm_translation/test_together_ai_e2e.py
index a3ca7f0fc3b..90581aadd43 100644
--- a/tests/e2e/llm_translation/test_together_ai_e2e.py
+++ b/tests/e2e/llm_translation/test_together_ai_e2e.py
@@ -483,6 +483,9 @@ def _tool_use_blocks(content: list[AnthropicContentBlock] | None) -> list[Anthro
 def _validated_tool_use_id(block: AnthropicContentBlock) -> str:
     assert block.name == "get_weather", f"wrong tool called: {block}"
     assert block.id, f"tool_use block carries no id, so a tool_result cannot answer it: {block}"
+    assert block.input is not None, f"tool_use block carries no input: {block}"
+    args = _WeatherArgs.model_validate(block.input)
+    assert "paris" in args.location.lower(), f"tool input lost the location: {args}"
     return block.id
 
 
diff --git a/tests/e2e/models.py b/tests/e2e/models.py
index 8d1b17ca256..e8a392599fd 100644
--- a/tests/e2e/models.py
+++ b/tests/e2e/models.py
@@ -421,6 +421,7 @@ class AnthropicContentBlock(BaseModel):
     text: str | None = None
     id: str | None = None
     name: str | None = None
+    input: dict[str, object] | None = None
 
 
 class AnthropicToolResultBlock(BaseModel):