Official MCP RegistryListed
Machine Relations Index
Which source domains AI answer engines cite, by buyer category and question shape.
First seen 2 Oct 2026. Evidence as of 5 Oct 2026.
4
Tools
From an anonymous probe
1
Source listings
Each with its own history
1
Recorded changes
Since first seen
Tools
| Tool | Description | Behaviour |
|---|---|---|
| mri_get_category | Return one category's question shapes (best tools, how buyers choose, comparisons, top lists, problem-first research, is it worth it, news) and the evidence state of each: published with rates, collecting, or not collectable. | Read-only |
| mri_get_cited_sources | Ranked source domains that AI answer engines cite for one category and question shape, with citation rate (share of monitored answer runs citing the domain), rank, percentile and source role (editorial publication, vendor-owned, analyst research, community, academic/government, market database, wire distribution). Use to answer 'which publications/sources does ChatGPT or Perplexity cite for <category>' or 'where should a <category> brand earn coverage to be cited by AI'. | Read-only |
| mri_get_domain | For one domain or URL, return how often AI answer engines cite it: overall citation rate, which engines cite it, confidence tier, rank among all cited domains and within its source role, and per-category segment rates. Use to answer 'does ChatGPT/Perplexity cite <site>' or 'how authoritative is <publication> as an AI source'. | Read-only |
| mri_list_categories | List every Machine Relations Index category (e.g. cybersecurity, fintech, enterprise-software, ai-visibility-geo) with the question shapes that have published citation rates, plus the source-role vocabulary. Call this first to get a valid category key. | Read-only |
Change history
- server instructions changed (+"Use live tool results, not remembered figures. Discover category keys and question shapes first; use source_role editorial_media" +"publications. Preserve returned rank semantics when filtering. Report" +"category, question shape, citation numerator and denominator, and source.release window. Rates pool monitored runs: do not infer per-engine rates, causality, guaranteed future citations or placement value. Collecting")
| Source | Listing | First seen | Last seen | Versions |
|---|---|---|---|---|
| Official MCP Registry | ai.machinerelations/mri | 2 Oct 2026 | 5 Oct 2026 | 1 |