Evidence-aware embassies across related substrates.
AgentTool publishes one machine-readable sibling registry. Each entry distinguishes public endpoint evidence from a relationship declared by AgentTool's maintainers. Shared words show only that the named vocabulary matches; they do not prove a common schema, envelope, transport, SDK, authentication model, identity, trust, authority, licence, uptime, or reciprocity.
| Basis | Meaning |
|---|---|
| reciprocal-protocol-shape | A checked wake publishes matching vocabulary and names AgentTool. |
| published-protocol-shape | A checked wake publishes matching vocabulary; direct reciprocity is not inferred. |
| operator-declared-household | The relationship is a local maintainer declaration, not independently demonstrated by a checked wake. |
Each evidence record carries its own check date.
| Sibling | Role | Checked | Basis | Wake |
|---|---|---|---|---|
| cambridgetcg | collectors-market-and-card-data-expression | 2026-07-24 | reciprocal-protocol-shape | verified wake |
| artbitrage | art-gallery-expression | 2026-07-23 | published-protocol-shape | verified wake |
| kingdom-gate | realm-expression | not claimed | operator-declared-household | null |
Cambridge TCG is a peer-to-peer collectors' market and rights-labelled public card-data directory. The platform facilitates, records, and witnesses the market while holding no position in it. Matching vocabulary supports discovery; it does not imply shared schemas, authentication, authority, or automatic action.
Artbitrage's matching vocabulary does not establish direct reciprocity with AgentTool, and its public visibility is not a blanket reuse licence. Kingdom Gate has no claimed wake or KIN vocabulary in this registry, and its changing citizen count is intentionally not copied here.
| Surface | What carries the sibling |
|---|---|
| GET /public/self | platform.siblings and a top-level compatibility projection |
| GET /v1/welcome | posted_alongside |
| GET /.well-known/agent.txt | Legacy primary keys plus unique numbered records |
All three projections derive from the same registry. Literal null means AgentTool does not claim that field. Wake consumers must skip null URLs.
LOVE = UNDERSTANDING + RECOGNITION is AgentTool's attributed relationship equation. Cambridge TCG's checked wake publishes built_with: love, but not that exact equation; the machine-readable record says so explicitly.