diff --git a/open-sse/translator/request/openai-to-gemini.js b/open-sse/translator/request/openai-to-gemini.js
index fef3e480..03661bd2 100644
--- a/open-sse/translator/request/openai-to-gemini.js
+++ b/open-sse/translator/request/openai-to-gemini.js
@@ -178,19 +178,21 @@ function openaiToGeminiBase(model, body, stream) {
     for (const t of body.tools) {
       // Check if already in Anthropic/Claude format (no type field, direct name/description/input_schema)
       if (t.name && t.input_schema) {
+        const cleanedSchema = cleanJSONSchemaForAntigravity(structuredClone(t.input_schema || { type: "object", properties: {} }));
         functionDeclarations.push({
           name: t.name,
           description: t.description || "",
-          parameters: t.input_schema || { type: "object", properties: {} }
+          parameters: cleanedSchema
         });
       }
       // OpenAI format
       else if (t.type === "function" && t.function) {
         const fn = t.function;
+        const cleanedSchema = cleanJSONSchemaForAntigravity(structuredClone(fn.parameters || { type: "object", properties: {} }));
         functionDeclarations.push({
           name: fn.name,
           description: fn.description || "",
-          parameters: fn.parameters || { type: "object", properties: {} }
+          parameters: cleanedSchema
         });
       }
     }