From 9dc5e6c72c6439bb1ad19fb6454d1a14d6aedeb4 Mon Sep 17 00:00:00 2001
From: aiedwardyi <41576951+aiedwardyi@users.noreply.github.com>
Date: Mon, 24 Aug 2026 01:14:07 +0900
Subject: [PATCH] fix: deduplicate Responses follow-up params

---
 litellm/integrations/websearch_interception/handler.py    | 1 +
 .../websearch_interception/test_websearch_responses.py    | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/litellm/integrations/websearch_interception/handler.py b/litellm/integrations/websearch_interception/handler.py
index 13a16947fb4..cc0178ae400 100644
--- a/litellm/integrations/websearch_interception/handler.py
+++ b/litellm/integrations/websearch_interception/handler.py
@@ -1109,6 +1109,7 @@ class WebSearchInterceptionLogger(CustomLogger):
             k: v
             for k, v in kwargs.items()
             if not k.startswith("_websearch_interception")
+            and k not in optional_params_clean
             and k
             not in {
                 "_agentic_loop_api_surface",
diff --git a/tests/test_litellm/integrations/websearch_interception/test_websearch_responses.py b/tests/test_litellm/integrations/websearch_interception/test_websearch_responses.py
index 00b7299cc31..37e2f61de0a 100644
--- a/tests/test_litellm/integrations/websearch_interception/test_websearch_responses.py
+++ b/tests/test_litellm/integrations/websearch_interception/test_websearch_responses.py
@@ -218,12 +218,16 @@ async def test_build_responses_plan_produces_responses_input():
             optional_params={
                 "tools": [{"type": "function", "name": "litellm_web_search"}],
                 "tool_choice": {"type": "function", "name": "litellm_web_search"},
+                "prompt_cache_key": "cache-key",
+                "prompt_cache_retention": "24h",
             },
             logging_obj=MagicMock(),
             stream=False,
             kwargs={
                 "custom_llm_provider": "openai",
                 "_agentic_loop_api_surface": RESPONSES_AGENTIC_SURFACE,
+                "prompt_cache_key": "cache-key",
+                "prompt_cache_retention": "24h",
             },
         )
 
@@ -249,6 +253,10 @@ async def test_build_responses_plan_produces_responses_input():
     assert patch_obj.tools == [{"type": "function", "name": "litellm_web_search"}]
     assert "tool_choice" not in patch_obj.optional_params
     assert "_agentic_loop_api_surface" not in patch_obj.kwargs
+    assert patch_obj.optional_params["prompt_cache_key"] == "cache-key"
+    assert patch_obj.optional_params["prompt_cache_retention"] == "24h"
+    assert "prompt_cache_key" not in patch_obj.kwargs
+    assert "prompt_cache_retention" not in patch_obj.kwargs
     assert patch_obj.model == "openai/gpt-4o"