diff --git a/backend/internal/service/gemini_messages_compat_service.go b/backend/internal/service/gemini_messages_compat_service.go
index a003f636..e65c838d 100644
--- a/backend/internal/service/gemini_messages_compat_service.go
+++ b/backend/internal/service/gemini_messages_compat_service.go
@@ -3235,7 +3235,7 @@ func cleanToolSchema(schema any) any {
 		for key, value := range v {
 			// 跳过不支持的字段
 			if key == "$schema" || key == "$id" || key == "$ref" ||
-				key == "additionalProperties" || key == "minLength" ||
+				key == "additionalProperties" || key == "patternProperties" || key == "minLength" ||
 				key == "maxLength" || key == "minItems" || key == "maxItems" {
 				continue
 			}