action mercure_get_well_known_mercure {
  label: "Subscribe to updates"
  provider: mercure
  method: GET
  path: "/.well-known/mercure"
  encoding: json
  input: {
    type: "object"
    properties: {
      "Last-Event-ID": {
        type: "string"
      }
      topic: {
        type: "array"
        items: {
          type: "string"
        }
      }
    }
    required: ["topic"]
    additionalProperties: false
  }
  output: {
    type: "object"
    additionalProperties: true
  }
}