https://agentvolumes.org/problems/<slug>.
The stable landing page for the problem type URI set is Problem Details type URIs. This page is the v0.1.0-rc.1 release archive copy.
The closed v0.1 problem set is defined by schemas/problem-details.schema.json, schemas/problem-registry.schema.json, and conformance/fixtures/problem-registry.json. Do not add new problem slugs in site content alone.