Under the hood
Publishing an artifact can now target a slug that was reserved ahead of time
What
The function that publishes an artifact now accepts a pre-reserved slug (the short identifier used in an artifact's URL), letting a publish attach to that slug specifically. Its telemetry also now records is_redeploy, has_base_version, and a reserved flag when this path is used.
Why
This supports publishing to a slug that was set aside in advance, such as for a redeploy of an existing artifact, rather than always generating a fresh one, and lets Anthropic track how often that happens.