Containment of SCP-153 is passive: the anomaly is bounded by its own hostname and does not propagate beyond https://promptrot.bisks.net/ under any observed condition. As a Safe-class object, SCP-153 may be accessed by any individual possessing a standard web browser and an internet connection; no special clearance is required for observation.
SCP-153, catalogued internally as "promptrot," classified as a memetic anomaly, is reachable at https://promptrot.bisks.net/.
The anomaly's own landing page offers the following unprompted self-description:
paste a clean, well-specified prompt and watch it decay into a stacked Bluesky thread of lowercase, typo'd, scope-creeping follow-ups — @fromthewestmeadow.com asked buildthis to read its own mentions and enshittify the way they've actually been prompting it.
SCP-153 entered Foundation custody after being flagged by field asset @fromthewestmeadow.com, whose transmission initiated standard containment procedure. No discovery date is on record.
Addendum 153-A: Personnel are reminded that Safe classification describes containment difficulty, not triviality. Do not treat SCP-153 as uninteresting on this basis alone.