diff --git a/api/blueprints/ai/llm/invoke.py b/api/blueprints/ai/llm/invoke.py
index ca06063..0218b5e 100644
--- a/api/blueprints/ai/llm/invoke.py
+++ b/api/blueprints/ai/llm/invoke.py
@@ -185,7 +185,7 @@ async def invoke_llm(
             "model": llm_response.model,
             "output": llm_response.output,
             "tokens": llm_response.tokens.model_dump(),
-            "invocationId": llm_response.invocationId
+            "invocationId": str(llm_response.invocationId)
         } if success else None
     )
 
diff --git a/controllers_v2/message/mail/base.py b/controllers_v2/message/mail/base.py
index 2c9722f..63d6ae9 100644
--- a/controllers_v2/message/mail/base.py
+++ b/controllers_v2/message/mail/base.py
@@ -151,7 +151,7 @@ class MailController(CoreMessageController, ABC):
         LLMInputMessage(
             role = "system",
             content = (
-                "You're an expert mail summary assistant. That summarizes sent mails in 150 chars or less. "
+                "You're an expert mail summary assistant that summarizes sent mails in 150 chars or less. "
                 "The objective of your user is to be able to recollect what the mail they sent was about from a brief "
                 "summary. Reply in a simple string, no formatting is allowed except emojis. Good luck :)"
             )