Willison shipped a cross-database sqlite-utils in one morning, and the prompt is the artifact.

alchemy-utils 0.1a0 reimplements sqlite-utils' core API on SQLAlchemy so it runs against PostgreSQL, SQLite, and DuckDB with identical calls. The prompt specified the reference implementation path, mandated red/green TDD with pytest, named a repo to copy the Postgres test strategy from, and required uv init plus early frequent commits. Very few follow-ups to releasable alpha. That prompt shape, reference implementation, test discipline, a named repo to imitate, is the reusable part.