Amazon S3 annotations: attach rich, queryable context directly to your objects

AWS introduced S3 annotations, a new S3 metadata feature for attaching up to 1,000 mutable, queryable annotations to each object.

The annotations support richer formats and can be queried through S3 Metadata tables in Athena and other analytics engines.

This lets teams keep object context current without separate metadata systems, cutting sync overhead at S3 scale.

The feature is aimed at AI and analytics workflows that need searchable, up-to-date context across large S3 datasets.