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Born from running into Cosmos DB pitfalls firsthand - silent client-side query evaluation, lost writes from missing concurrency checks, and Entity Framework pretending Cosmos is RDBMS. Cosmosis is a thin wrapper around the raw SDK that makes the safe path the default path.

• Optimistic concurrency by default - Updates accept a function rather than a document, with ETag If-Match always on. Conflicts retry automatically instead of silently overwriting.
• Constrained query builder - A LINQ-alike interface that only exposes operations Cosmos can actually execute server-side, turning runtime surprises into compile-time errors.
• Resilience as configuration, not afterthought - Categorized retry tracking, exponential backoff, and explicit tradeoff options for inherently ambiguous operations like create-after-timeout.