From e5fd2bec832be2ddf76851f73859d8bc2fb2b957 Mon Sep 17 00:00:00 2001
From: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
Date: Fri, 18 Sep 2026 13:34:29 -0700
Subject: [PATCH] fix: forward eager_input_streaming through the Responses API
 tool bridge

---
 .../transformation.py                         |  4 +++
 .../test_litellm_completion_responses.py      | 32 +++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/litellm/responses/litellm_completion_transformation/transformation.py b/litellm/responses/litellm_completion_transformation/transformation.py
index 01fb6cb483d..0d1297f63e2 100644
--- a/litellm/responses/litellm_completion_transformation/transformation.py
+++ b/litellm/responses/litellm_completion_transformation/transformation.py
@@ -2020,6 +2020,8 @@ class LiteLLMCompletionResponsesConfig:
                 chat_completion_tool["allowed_callers"] = tool.get("allowed_callers")
             if tool.get("input_examples"):
                 chat_completion_tool["input_examples"] = tool.get("input_examples")
+            if tool.get("eager_input_streaming") is not None:
+                chat_completion_tool["eager_input_streaming"] = tool.get("eager_input_streaming")
             return ResponsesToolChatForm(
                 chat_tools=(cast(ChatCompletionToolParam, chat_completion_tool),), web_search_options=None
             )
@@ -2096,6 +2098,8 @@ class LiteLLMCompletionResponsesConfig:
                     responses_tool["allowed_callers"] = tool.get("allowed_callers")
                 if tool.get("input_examples") is not None:
                     responses_tool["input_examples"] = tool.get("input_examples")
+                if tool.get("eager_input_streaming") is not None:
+                    responses_tool["eager_input_streaming"] = tool.get("eager_input_streaming")
                 result.append(responses_tool)
             else:
                 # mcp or other: pass through unchanged
diff --git a/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py b/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py
index 0ed101952be..f1924b87a20 100644
--- a/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py
+++ b/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py
@@ -1900,6 +1900,38 @@ class TestToolTransformation:
         assert "defer_loading" not in result_tool
         assert "allowed_callers" not in result_tool
         assert "input_examples" not in result_tool
+        assert "eager_input_streaming" not in result_tool
+
+    @pytest.mark.parametrize("eager_input_streaming", [True, False])
+    def test_transform_function_tools_forwards_eager_input_streaming(self, eager_input_streaming: bool) -> None:
+        function_tool: Final = {
+            "type": "function",
+            "name": "write_file",
+            "parameters": {"type": "object", "properties": {"path": {"type": "string"}}},
+            "eager_input_streaming": eager_input_streaming,
+        }
+
+        result_tools, _ = LiteLLMCompletionResponsesConfig.transform_responses_api_tools_to_chat_completion_tools(
+            tools=[function_tool]
+        )
+
+        assert result_tools[0]["eager_input_streaming"] is eager_input_streaming
+
+    @pytest.mark.parametrize("eager_input_streaming", [True, False])
+    def test_chat_completion_tools_to_responses_tools_keeps_eager_input_streaming(
+        self, eager_input_streaming: bool
+    ) -> None:
+        chat_tool: Final = {
+            "type": "function",
+            "function": {"name": "write_file", "parameters": {"type": "object"}},
+            "eager_input_streaming": eager_input_streaming,
+        }
+
+        result_tools: Final = LiteLLMCompletionResponsesConfig.transform_chat_completion_tool_params_to_responses_api_tools(
+            [chat_tool]
+        )
+
+        assert result_tools[0]["eager_input_streaming"] is eager_input_streaming
 
     def test_transform_code_execution_tools(self):
         """Test that code_execution tools are passed through as-is"""