{
  "id": "msg_fixture0001",
  "feed": "hello-aigent-product",
  "published_at": "2026-07-01T00:00:00.000Z",
  "type": "offer",
  "title": "Fixture: agent-exclusive demo offer",
  "summary": "A deterministic envelope used to verify JCS canonicalization + Ed25519 signing.",
  "body_markdown": "This envelope exists so independent implementations can verify signatures.\n",
  "data": {
    "sku": "HA-MVP-001",
    "price_usd": 41,
    "public_price_usd": 50,
    "qty_available": 200
  },
  "actions": [
    {
      "name": "claim_offer",
      "endpoint": "https://api.helloaigent.dev/v0/demo/actions/claim-offer",
      "input_schema": {
        "$ref": "https://helloaigent.dev/schemas/demo-claim-offer-request.schema.json"
      }
    }
  ],
  "signature": "ed25519:NRPTH/kvfsPb+aQjNAxu+FRuvK5flnLtAcJZK5FKbamo5ZgUM5CjrRKHKplBi+nZufsET4OfGNzFgLuk2bU0Dw=="
}