AWS S3

Use this skill for application code that integrates with Amazon S3 through the AWS SDK for JavaScript v3.

Official sources:

• AWS SDK for JavaScript v3 repository: https://github.com/aws/aws-sdk-js-v3
• S3 client package: https://github.com/aws/aws-sdk-js-v3/tree/main/clients/client-s3
• AWS SDK for JavaScript v3 developer guide: https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/

Core Rules

• Reuse one S3Client per runtime context instead of constructing clients per operation.
• Read region and credentials from the runtime environment or injected config; do not hardcode secrets.
• Keep S3 behind a small application port when business logic depends on object storage.
• Validate caller input before building Bucket and Key.
• Treat S3 object bodies as streams; consume, pipe, or discard them exactly once.
• Normalize AWS errors at the adapter boundary so application code does not depend on SDK exception details.
• Avoid public buckets by default. Prefer presigned URLs or private object access.