Running command	Cancel command	Wait for cancellation
`start-metadata-model-conversion`	`cancel-metadata-model-conversion`	`aws dms wait metadata-model-conversion-cancelled`
`start-metadata-model-creation`	`cancel-metadata-model-creation`	`aws dms wait metadata-model-creation-cancelled`

aws dms cancel-metadata-model-conversion \
  --migration-project-identifier <project_arn>

After cancelling, wait for completion:

aws dms wait metadata-model-conversion-cancelled \
  --migration-project-identifier <project_arn>

aws dms cancel-metadata-model-creation \
  --migration-project-identifier <project_arn>

After cancelling, wait for completion:

aws dms wait metadata-model-creation-cancelled \
  --migration-project-identifier <project_arn>

All other operations (import, assessment, export) are non-cancellable — inform the customer they must wait for completion.

Identify which async operation is currently running
Check if it is cancellable (see table above)
If cancellable: warn the customer that all progress will be lost and the operation will need to be restarted from scratch. If they confirm, run the cancel command
Wait for the cancellation to complete using the corresponding waiter
If not cancellable: inform the customer the operation cannot be cancelled and must complete
Return to the actions menu

references/cancel-operations.md