diff --git a/supabase/functions/create-chat-conversation/index.ts b/supabase/functions/create-chat-conversation/index.ts
index b901766..aebce16 100644
--- a/supabase/functions/create-chat-conversation/index.ts
+++ b/supabase/functions/create-chat-conversation/index.ts
@@ -291,6 +291,8 @@ app.post(`${prefix}/conversations/:id/messages`, async (c) => {
                     "Indica si la respuesta es un refusal (es decir, la pregunta no tiene que ver con el plan de estudio)",
                 },
               },
+              required: ["ai-message", "is_refusal"],
+              additionalProperties: false,
             },
           },
         },