(google llm): ruff and add cache warnings

livekit-plugins/livekit-plugins-google/livekit/plugins/google/llm.py

@@ -401,7 +401,7 @@ def chat(
 
         if is_given(self._opts.cached_content):
             extra["cached_content"] = self._opts.cached_content
-    
+
         if is_given(self._opts.media_resolution):
             extra["media_resolution"] = self._opts.media_resolution
 
@@ -462,6 +462,18 @@ async def _run(self) -> None:
             if tools_config and not using_cache:
                 self._extra_kwargs["tools"] = tools_config
             elif using_cache:
+                dropped = [k for k in ("tools", "tool_config") if k in self._extra_kwargs]
+                if tools_config and "tools" not in dropped:
+                    dropped.append("tools")
+                if extra_data.system_messages:
+                    dropped.append("system_instruction")
+                if dropped:
+                    logger.warning(
+                        "dropping %s from Gemini request because cached_content=%r is set; "
+                        "these fields must be baked into the CachedContent resource",
+                        dropped,
+                        self._extra_kwargs.get("cached_content"),
+                    )
                 self._extra_kwargs.pop("tools", None)
                 self._extra_kwargs.pop("tool_config", None)
             http_options = self._llm._opts.http_options or types.HttpOptions(

tests/test_plugin_google_llm.py

@@ -243,7 +243,6 @@ async def example_tool(query: str) -> str:
 
 
 class TestMediaResolution:
-
     def test_llm_media_resolution_is_passed_to_stream_kwargs(self):
         model = LLM(
             api_key="test-api-key",