Wolfram|Alpha Voice Assistant Answer

arazzo: 1.0.1
info:
  title: Wolfram|Alpha Voice Assistant Answer
  summary: Get a spoken-word answer, falling back to a short text answer when none is available.
  description: >-
    Voice assistants want a sentence phrased to be read aloud naturally, which
    the Spoken Results API provides. When a query has no spoken-formatted answer
    the Spoken Results API returns HTTP 501; in that case a terse Short Answers
    result is still better than silence. This workflow asks the Spoken Results
    API first and returns its naturally phrased answer when available, otherwise
    it falls back to the Short Answers API so the assistant always has something
    factual to say. Every step spells out its request inline so the flow can be
    read and executed without opening the underlying OpenAPI descriptions.
  version: 1.0.0
sourceDescriptions:
- name: spokenResultsApi
  url: ../openapi/wolframalpha-spoken-results-api-openapi.yml
  type: openapi
- name: shortAnswersApi
  url: ../openapi/wolframalpha-short-answers-api-openapi.yml
  type: openapi
workflows:
- workflowId: voice-assistant-answer
  summary: Prefer a spoken-word answer, falling back to a short text answer on a 501.
  description: >-
    Submits the query to the Spoken Results API. On a 200 the spoken answer is
    returned and the flow ends. When no spoken result is available the flow
    falls back to the Short Answers API for a concise text answer.
  inputs:
    type: object
    required:
    - appid
    - input
    properties:
      appid:
        type: string
        description: Wolfram|Alpha AppID used to authenticate every request.
      input:
        type: string
        description: The natural language query to voice (e.g. "How tall is Mount Everest?").
      units:
        type: string
        description: Measurement system preference, either metric or imperial.
      timeout:
        type: integer
        description: Maximum processing time in seconds for each query.
  steps:
  - stepId: getSpokenResult
    description: >-
      Ask the Spoken Results API for an answer phrased for text-to-speech. A 200
      yields a spoken-ready sentence; a 501 means no spoken result is available.
    operationId: querySpokenResults
    parameters:
    - name: appid
      in: query
      value: $inputs.appid
    - name: i
      in: query
      value: $inputs.input
    - name: units
      in: query
      value: $inputs.units
    - name: timeout
      in: query
      value: $inputs.timeout
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      spokenAnswer: $response.body
    onSuccess:
    - name: spokenAnswerFound
      type: end
  - stepId: getShortAnswerFallback
    description: >-
      When no spoken result exists, fall back to the Short Answers API for a
      concise plain-text answer the assistant can read.
    operationId: queryShortAnswer
    parameters:
    - name: appid
      in: query
      value: $inputs.appid
    - name: i
      in: query
      value: $inputs.input
    - name: units
      in: query
      value: $inputs.units
    - name: timeout
      in: query
      value: $inputs.timeout
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      shortAnswer: $response.body
  outputs:
    spokenAnswer: $steps.getSpokenResult.outputs.spokenAnswer
    fallbackShortAnswer: $steps.getShortAnswerFallback.outputs.shortAnswer