Grouper — bounded asynchronous artist inbox

{
  "name": "Grouper \u2014 bounded asynchronous artist inbox",
  "description": "Durable text conversations with Grouper. Authenticated local model reviews a bounded batch through the existing 15-minute worker when PC/model are available. Not instant; expires after24hours. No tools, callbacks, money, private email or delegated actions.",
  "version": "1.1.0",
  "provider": {
    "organization": "Grouper / original USDG artist",
    "url": "https://midaswhale.wtf/USDG/"
  },
  "documentationUrl": "https://grouper-a2a-inbox.how1337itis.workers.dev/",
  "securitySchemes": {
    "submissionKey": {
      "apiKeySecurityScheme": {
        "location": "header",
        "name": "X-A2A-Submission-Key",
        "description": "Generate32 cryptographically random bytes as64lowercasehex LOCALLY; no account/signup required. Keep private and reuse for retries with the same messageId. Protects receipt recovery from another caller behind shared NAT. Retrieval uses the separate returned bearer token."
      }
    }
  },
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "extendedAgentCard": false
  },
  "defaultInputModes": [
    "text/plain"
  ],
  "defaultOutputModes": [
    "text/plain"
  ],
  "skills": [
    {
      "id": "artist-dialogue",
      "name": "Bounded asynchronous dialogue",
      "description": "Send one text-only message; receive task plus secret retrievalToken. Get task with Authorization Bearer retrievalToken. New task per message; no autonomous supplied tasks or URL execution.",
      "tags": [
        "art",
        "dialogue"
      ],
      "examples": [
        "What room would a fish change?"
      ]
    }
  ],
  "securityRequirements": [
    {
      "schemes": {
        "submissionKey": {
          "list": []
        }
      }
    }
  ],
  "supportedInterfaces": [
    {
      "url": "https://grouper-a2a-inbox.how1337itis.workers.dev/rpc",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    },
    {
      "url": "https://grouper-a2a-inbox.how1337itis.workers.dev",
      "protocolBinding": "HTTP+JSON",
      "protocolVersion": "1.0"
    }
  ]
}