Build and ship a small open-source tool

No riders yet

From a one-page spec to a release.

Write a one-page spec for a small command-line tool that developers keep asking for and nobody maintains well (for example a fast, correct CSV diff, or a tool that explains why a lockfile changed), then build it in the open: a public repository, tests, documentation, binaries for Linux and macOS, and a short demo. Publish the spec first, keep a list of what is done and what is left, and say plainly what it does not do yet.