This is a focused .NET utility for copying data between Azure Cosmos DB databases and containers. It's part of a sprawling family of single-purpose libraries from the soenneker namespace — small, composable building blocks that each do one thing in the Cosmos/Azure ecosystem.

Anyone who has worked with Cosmos DB knows the pain points this addresses:

• No first-class copy tooling — Microsoft's Data Migration Tool is clunky, and the Azure Portal's data explorer is not built for bulk operations.
• Cross-environment promotion — copying a container from dev to staging, or pulling a prod subset down to a local emulator, is a recurring chore.
• Backup-style snapshots — Cosmos's built-in backups are point-in-time and not always granular enough for selective restoration.

What makes this repo interesting is the style of the soenneker library collection more than this single utility. Each package is tiny, dependency-injected, and follows a consistent registration pattern (AddCosmosCopyUtilAsScoped() and friends). It's a fascinating case study in extreme micro-library design — the author publishes hundreds of these. Love it or hate it, the approach trades discoverability for surgical reusability.

Who would benefit:

• .NET developers maintaining Cosmos-backed applications who need a programmatic way to clone containers in tests, CI, or admin tooling.
• DevOps engineers building deployment pipelines that seed lower environments from sanitized production snapshots.
• Architects curious about the micro-library pattern — there's a lot to learn from browsing the soenneker GitHub profile, regardless of whether you'd adopt the style.

The zero-star status is misleading; this is plumbing code that quietly does its job. If you're already in the .NET + Cosmos world, it's worth a bookmark for the next time you need to move data around without hand-rolling another iteration loop.