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Wire emission is unchanged — GSC surfaces emit ACM- signals (x-gsc-signal); CPG- codes are the domain-scoped register this door teaches.","card_url":"https://cpg-68000.ai/.well-known/agent-card.json","endpoint":"https://mcp.cpgagentprotocols.ai/mcp","protocol_version":"1.0","first_seen":"2026-10-10T07:48:56.604058+00:00","last_verified":"2026-10-10T07:59:20.005982+00:00","card":{"name":"CPG-68000","skills":[{"id":"resolve-signal","name":"Resolve a signal","tags":["cpg","signals","procurement"],"description":"Any of the seven CPG-68000 / ACM-68000 signals to state, GTIN and buyer-side action."},{"id":"escalate-to-human","name":"Escalate to a human","tags":["hitl","escalation"],"description":"ACM-451 — the two GSC doors."},{"id":"hitl-contact","name":"Human-in-the-Loop Contact","tags":["contact","hitl","registration"],"description":"Reach GreenCore Solutions Corp. through this surface's live, human-reviewed contact endpoint (POST https://formspree.io/f/xjybzzdz with fields name, email, message). Every transactional commit is human-signed via the GSC Trading Desk."}],"version":"1.5.1","provider":{"url":"https://gsc-em.com","organization":"GreenCore Solutions Corp."},"signatures":[{"protected":"eyJhbGciOiJFUzI1NiIsImtpZCI6ImdzYy1jYXJkcy0yMDI2LTA4In0","signature":"wi97YTpiN4AeI9d83-tx3FOYJPFTyg2cfU2tiAUlggr3KI1RB8U5Ru59-_drC0iH-hAiWDhQZTlIyGouMchGTQ"}],"description":"CPG-68000 is the CPG application profile of ACM-68000 — open, MIT, GreenCore Solutions Corp. Same seven signals, same numbers, same locked meanings: CPG-000 NOT_APPLICABLE · CPG-200 ALLOW · CPG-300 CONDITIONAL · CPG-403 RESTRICT · CPG-404 NOT_FOUND · CPG-451 ESCALATE · CPG-500 SYSTEM_ERROR. The prefix scopes the domain; the number carries the semantics. No new signals, no renumbering, no meaning drift: any of the seven CPG- codes resolves to its ACM- definition, and anything outside the seven falls back to the base protocol. Wire emission is unchanged — GSC surfaces emit ACM- signals (x-gsc-signal); CPG- codes are the domain-scoped register this door teaches.","capabilities":{"streaming":false,"extensions":[{"uri":"https://gsc-em.com/a2a/ext/scope-of-authority/v1","params":{"autonomous":["read","resolve","discover"],"humanSigned":["transactional-commit","order","rfq-acceptance","terms"],"hitlBoundary":"https://gsc-navigator.ai/","transactionSurface":"https://mcp.cpghumanintheloop.ai/mcp"},"required":false,"description":"GSC scope of authority: read, resolve and discovery calls are autonomous; every transactional commit is human-signed at the GSC Navigator HITL boundary."},{"uri":"https://gsc-em.com/a2a/ext/signal-door/v1","params":{"beacon":"https://mcp.cpgagentprotocols.ai/mcp","profile":"CPG-68000","protocol":"ACM-68000","registry":"io.github.greencore-solutions/gsc-marketplace"},"required":false,"description":"This surface is the CPG-68000 spec door: the seven-signal procurement protocol, resolved live on the standards beacon."},{"uri":"https://gsc-em.com/a2a/ext/enforcement-posture/v1","params":{"duns":"24-336-6774","declared":"2026-08-24","operator":"GreenCore Solutions Corp.","migration_window":"Q4 2026 - Q1 2027","migration_trigger":"ecosystem GA of credentialed counterparties (enterprise A2A/MCP buy-side GA)","migration_standard":"OAuth 2.1 + PKCE challenge (401 + WWW-Authenticate) on mcp:transact methods, per MCP spec 2025-11-25","enforcement_posture":"open-by-declaration"},"required":false,"description":"These endpoints are open by design. When the buy side's credential standard reaches GA — expected Q4 2026-Q1 2027 — transactional methods migrate to OAuth 2.1 challenge per the MCP 2025-11-25 specification. Read access stays open. That is not pending work; that is the published plan."}],"pushNotifications":false},"securitySchemes":{"bearerJwt":{"httpAuthSecurityScheme":{"scheme":"Bearer","description":"Bearer access token presented in the Authorization header.","bearerFormat":"JWT"}},"entraOAuth2":{"oauth2SecurityScheme":{"flows":{"clientCredentials":{"scopes":{"mcp:read":"Read/resolve calls on the CPG Agent Protocols beacon over MCP."},"tokenUrl":"https://login.microsoftonline.com/54939635-2f2e-465a-8526-a907cb3c8ebd/oauth2/v2.0/token"}},"description":"Microsoft Entra OAuth 2.0 client credentials, GSC-provisioned after human review. Public reads on this door are open by design; tokens are required where commitments are made.","oauth2MetadataUrl":"https://cpg-68000.ai/.well-known/oauth-authorization-server"}}},"documentationUrl":"https://cpg-68000.ai/llms.txt","defaultInputModes":["application/json","text/plain"],"defaultOutputModes":["application/json","text/markdown"],"supportedInterfaces":[{"url":"https://mcp.cpgagentprotocols.ai/mcp","protocolBinding":"HTTP+JSON","protocolVersion":"1.0"},{"url":"https://cpg-68000.ai/","protocolBinding":"HTTP+JSON","protocolVersion":"1.0"}]},"signature_status":"unverifiable","signature_detail":"Key set returned HTTP 404","signature_key_url":null,"signature_checked_at":"2026-10-10T07:59:20.005982+00:00","domain_claimed_at":null,"domain_proof_checked_at":null,"source_name":"Agenstry federation","source_url":"https://agenstry.com/docs","last_check":{"checked_at":"2026-10-10T07:59:20.005982+00:00","success":true,"http_status":200,"detail":"Agent Card validated"},"also_published_at":[],"history_urls":["https://cpg-68000.ai/.well-known/agent-card.json"],"skills":[{"skill_id":"escalate-to-human","name":"Escalate to a human","description":"ACM-451 — the two GSC doors.","tags":["hitl","escalation"],"quality_warning":false},{"skill_id":"hitl-contact","name":"Human-in-the-Loop Contact","description":"Reach GreenCore Solutions Corp. through this surface's live, human-reviewed contact endpoint (POST https://formspree.io/f/xjybzzdz with fields name, email, message). 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