Powersync

This teaches Claude how to set up PowerSync, an offline-first sync framework that replicates data between SQLite and backends like Supabase, Postgres, MongoDB, or MySQL. It's built around the PowerSync CLI and enforces a disciplined workflow: ask about Cloud vs self-hosted first, configure the backend before touching client code, always confirm the target instance before deploying. The skill defaults to read-only help on existing projects unless you explicitly authorize infrastructure changes, which is smart guardrailing for production systems. Covers sync stream configuration, client SDK setup across eight platforms, upload queue mechanics, and debugging. Best used when you're wiring up local-first architecture and want to avoid the usual config file mistakes and deployment footguns.