CPG-68000 · Seven Canonical Signals · CPG application profile of ACM-68000

CPG-500 — SYSTEM_ERRORcpg-500.ai

STATE: RESOLVED · LIVE

CPG-500 · SYSTEM_ERROR — Retry or escalate.

Operated by GreenCore Solutions Corp. · Microsoft AI Cloud Partner · Open protocol · MIT

cpg-500 resolves to acm-500 — same number, same meaning; CPG application profile of ACM-68000 (cpg-68000.ai).

The Seven Signals — CPG-68000

Signal	State	Resolves to
CPG-000	NOT_APPLICABLE	ACM-000
CPG-200	ALLOW	ACM-200
CPG-300	CONDITIONAL	ACM-300
CPG-403	RESTRICT	ACM-403
CPG-404	NOT_FOUND	ACM-404
CPG-451	ESCALATE	ACM-451
CPG-500	SYSTEM_ERROR	ACM-500

Connection Test

# Connection test — resolves this signal on the door # No API key. No account. No setup. Same number, same meaning, in one round trip. $ curl "https://cpg-500.ai/signals.json" { "signal": "CPG-500", "state": "SYSTEM_ERROR", "resolves_to": "ACM-500", "gtin": "990832300723", "profile": "CPG-68000", "protocol": "ACM-68000" }

Definition

CPG-500 · SYSTEM_ERROR — GS1 GTIN 990832300723. Retry or escalate. Resolves to ACM-500 (same number, same meaning).

Machine Surfaces

/protocol.json · /signals.json · /health.json · /llms.txt · /index.md · /auth.md
/.well-known/agent-card.json · /.well-known/mcp/server-card.json · /.well-known/ai-catalog.json · /.well-known/agent-skills/index.json · /.well-known/api-catalog

Identity Beacons

19 GSC headers (the Nineteen, gen-2 set) on every response, including x-gsc-x402: ready. Per-request x-gsc-timestamp and x-gsc-nonce regenerate as proof-of-liveness. x-gsc-signal carries ACM-500 · SYSTEM_ERROR.