Can't view list of vectors ingested in AWS S3 Vector Database

You're correct that there isn't a console interface to view the actual vectors stored in your S3 vector index. The AWS Management Console for S3 Vectors allows you to view and manage vector indexes themselves (including their names, creation dates, and ARNs), but not the individual vectors within those indexes.

To view the vectors that have been ingested, you do need to use programmatic methods like the AWS CLI or AWS SDKs (such as boto3 for Python). You can use the ListVectors API operation through these tools to retrieve the vectors in your index. When listing vectors, you can optionally return the vector data and metadata, which would help you identify what's already been added.

For checking duplicates before insertion, you might want to implement a programmatic solution that queries your existing vectors before adding new ones. The ListVectors operation supports pagination and can even be parallelized for better performance on large vector indexes by using segment parameters.

While this may feel less intuitive compared to a visual console interface, it's the current method for inspecting vector contents in S3 Vectors. The console is primarily designed for managing the vector bucket and index infrastructure rather than browsing individual vector entries.
Sources
Listing vectors - Amazon Simple Storage Service
list_vectors - Boto3 1.42.2 documentation
Listing vector indexes - Amazon Simple Storage Service