scrydon

The unscoped alias for @scrydon/cli, so the short name works:

npx scrydon login https://app.example.com
bunx scrydon login https://app.example.com

That is all this package is. It contains no logic beyond resolving @scrydon/cli's bin and handing over — the implementation, the documentation, and the version that matters all live there.

Which one should I install?

Either. @scrydon/cli is the canonical name and what the docs use; scrydon is here so the obvious command works and so the name cannot be squatted.

Installing both is harmless but pointless: they declare the same scrydon bin, so whichever is linked last wins, and they do the same thing.

scrydon --version reports @scrydon/cli's version

Deliberate. The alias forwards to the real CLI, which reports its own version — the implementation you are actually running. The alias's own version number is packaging metadata and is not what you want in a bug report.