@psalm-self-out

The @psalm-self-out tag documents the refined type of $this after the method call, letting callers see a narrower object type than the one they started with.

Parsing a @psalm-self-out tag produces a SelfOutTag instance, carrying the parsed $type alongside the $name and optional $description every Tag already provides.

The same SelfOutTag is produced by @phpstan-self-out, which restates the same concept for its tool.

The confirmed spelling for the same feature under Psalm's own documentation is @psalm-this-out.