# Limitations

Limitation Description
APIs must be published to be usable APIs are only available for use inside workflows and agents after it is published.
Only single-step integrations are supported in APIs Each tool can be configured for just one API call. If your use case involves chaining multiple API calls, you'll need to create separate API tools for each.
Tools cannot call other tools Tools are standalone by design. You can’t link or nest one tool inside another in Tools Interface.
File Download and Upload are not supported in Agents for cloud storage connectors Connectors used in Agents currently lack the capability to access, retrieve and upload files from external cloud storage systems (e.g., S3, Google Drive, etc.).This limitation does not apply to Automated Workflows.
File Data Type Support in Custom Functions Custom Functions do not currently support the File data type for any input or output parameters when used within Agents. This limitation does not apply to Automated Workflows.