GET /errors/simulate/<code> now answers the way the chosen surface answers the code, as the code's page shows it: the surface's status, Content-Type and body, Retry-After with the catalogue's value where the surface sends one, and Rivr-Should-Retry on the organisation-key check.
This page needs JavaScript. The same content is available as Markdown: /changelog/2026-11-01-error-simulator-per-surface.md. Every document for agents is listed in /llms.txt.