While executing the Outlook Calendar create_event tool using LangGraph with the Composio SDK, the workflow fails during tool execution with a TypeError: Object of type AttendeeInfo is not JSON serializable. The error occurs when the tool invocation is being serialized into an HTTP request, causing the request construction to fail before the Outlook / Microsoft Graph API is called. As a result, event creation with attendees does not proceed and the agent-to-tool execution flow breaks. I tried invoking the action using the same tool execute API endpoint through postman, and was able to create the event without any hurdles. @Abhishek https://cdn.discordapp.com/attachments/1452667420467531789/1452667421339942923/image.png?ex=697a1b76&is=6978c9f6&hm=8bdfa35cc9bab1010d34d87a01a91e387614753972068cac20cbca259930bc18&

Hey @Bhukya Yedukondalu Naik, could you share a minimal reproducible code snippet?

Hey @Uday Sidagana , here I have the test snippet that closely resembles our implementation. https://colab.research.google.com/drive/1IT_-G12TCYDn1LPSYUpDNe7wOvM5xnJc?usp=sharing

Got it, I was able to reproduce the issue using the error prompt(including attendees) and the issue with the

from

parameter being invalid. I've esclated the issue with the eng team. I'll keep you updated. https://cdn.discordapp.com/attachments/1452667420467531789/1452895650151923793/Screenshot_2025-12-23_at_10.54.07.png?ex=694b7a04&is=694a2884&hm=5105c90e18c8702efbbad8af6a3e72d466412a4f5f1f80712161805ec121ca39&

Sounds great @Uday Sidagana . Thank you.

Hey @Bhukya Yedukondalu Naik, yes, we've fixed the issue with

OUTLOOK_SEND_EMAIL

and we are currently working on a fix for

OUTLOOK_CALENDAR_CREATE_EVENT

. I'll update you when the fix is live.

Great to hear that @Uday Sidagana . Eagerly counting on second issue 👀

Hey @Bhukya Yedukondalu Naik, the fixes are live!

Awesome, let me check from my end.