{
  "machineId": "one-off-example",
  "programBase64": "<canonical base64 x86-64 run-now guest>",
  "request": {
    "method": "POST",
    "path": "/tasks/example",
    "query": "mode=demo",
    "bodyBase64": "eyJtZXNzYWdlIjoiaGVsbG8ifQ=="
  },
  "permissions": ["q:append", "q:read"],
  "maxCalls": 2
}