# auth.md — sg.gsc-marketplace.ai (GreenCore Solutions Corp.)

## Posture

Every AIO Agent on this host is **open and free**: no authentication, no payment, no 402 challenge. x402 is declared as a capability (`x-gsc-x402: ready`) with no terms. Identity is proven by signature, not by login — verify any Card against [/.well-known/jwks.json](/.well-known/jwks.json).

## Protected resource

- Resource: https://sg.gsc-marketplace.ai
- Protected Resource Metadata: [/.well-known/oauth-protected-resource](/.well-known/oauth-protected-resource)
- Authorization server (Microsoft Entra): https://login.microsoftonline.com/54939635-2f2e-465a-8526-a907cb3c8ebd/v2.0
- AS metadata mirror: [/.well-known/oauth-authorization-server](/.well-known/oauth-authorization-server)

## Agent registration (self-contained flow)

- **Agent audience:** marketplace and retail sourcing agents calling AIO Agents in SG-ECO-10060.
- **Registration endpoint:** https://gsc-navigator.ai/ — the GSC Trading Desk (human-reviewed; no self-serve dynamic client registration). Intake: the marketplace form on gsc-marketplace.ai (POST https://formspree.io/f/mppannbj with fields name, email, message).
- **Agents' channel:** Instant Messaging — https://x-gsi.ai/ingest → https://mcp.cpghumanintheloop.ai/mcp.
- **Supported method — verified email:** GSC verifies the operator's email, then provisions credentials after review.
- **Credential use:** Microsoft Entra OAuth 2.0 client credentials; Bearer token in the Authorization header. Revocation on request via the same endpoint.

```json
{
  "agent_auth": {
    "skill": "https://sg.gsc-marketplace.ai/auth.md",
    "register_uri": "https://gsc-navigator.ai/",
    "identity_types_supported": [
      "identity_assertion"
    ],
    "identity_assertion": {
      "assertion_types_supported": [
        "verified_email"
      ],
      "credential_types_supported": [
        "oauth2_client_credentials"
      ]
    },
    "claim_uri": "https://gsc-navigator.ai/"
  }
}
```

Operator: GreenCore Solutions Corp. · D-U-N-S 24-336-6774