X List the Followers of a Handle

arazzo: 1.0.1
info:
  title: X List the Followers of a Handle
  summary: Resolve a username to an id, then page that user's followers.
  description: >-
    Resolves an X account by its @username and then retrieves the first page of
    that account's followers. The lookup step requests the user.fields needed to
    chain, and the followers step inlines the user.fields and max_results so the
    flow reads and executes without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: usersApi
  url: ../openapi/twitter-users-api-openapi.yml
  type: openapi
workflows:
- workflowId: followers-of-handle
  summary: Resolve a username and list that user's followers.
  description: >-
    Chains the username lookup endpoint into the followers endpoint so a caller
    can go from a handle to a page of follower accounts.
  inputs:
    type: object
    required:
    - username
    properties:
      username:
        type: string
        description: The @username whose followers to list, without the leading @.
      maxResults:
        type: integer
        description: The maximum number of followers to return per page (1-1000).
        default: 100
      authorization:
        type: string
        description: Bearer token to authorize the requests (e.g. "Bearer xxx").
  steps:
  - stepId: resolveUser
    description: Resolve the username into a numeric user id.
    operationId: getUsersByUsername
    parameters:
    - name: username
      in: path
      value: $inputs.username
    - name: user.fields
      in: query
      value: id,name,username
    - name: Authorization
      in: header
      value: $inputs.authorization
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      userId: $response.body#/data/id
  - stepId: getFollowers
    description: Retrieve the first page of followers for the resolved user.
    operationId: getUsersFollowers
    parameters:
    - name: id
      in: path
      value: $steps.resolveUser.outputs.userId
    - name: max_results
      in: query
      value: $inputs.maxResults
    - name: user.fields
      in: query
      value: id,name,username,public_metrics
    - name: Authorization
      in: header
      value: $inputs.authorization
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      followers: $response.body#/data
      nextToken: $response.body#/meta/next_token
  outputs:
    userId: $steps.resolveUser.outputs.userId
    followers: $steps.getFollowers.outputs.followers
    nextToken: $steps.getFollowers.outputs.nextToken