Amplitude Variant Evaluation

arazzo: 1.0.1
info:
  title: Amplitude Variant Evaluation
  summary: Download flag configurations for local evaluation, then remotely evaluate variant assignments for a user.
  description: >-
    Bootstraps and exercises the Amplitude Experiment Evaluation API. The
    workflow first downloads the full flag configuration set used for local
    evaluation and edge bootstrapping, then performs a remote evaluation for a
    specific user to retrieve their variant assignments across all active
    experiments and flags. Both steps authenticate with a deployment key passed
    as an Api-Key authorization header. Every step spells out its request inline
    so the flow can be read and executed without opening the underlying OpenAPI
    description.
  version: 1.0.0
sourceDescriptions:
- name: experimentEvaluationApi
  url: ../openapi/amplitude-experiment-evaluation-api-openapi.yml
  type: openapi
workflows:
- workflowId: evaluate-user-variants
  summary: Fetch flag configurations and remotely evaluate variant assignments for a user.
  description: >-
    Downloads the flag configurations for local evaluation, then remotely
    evaluates the active experiments and flags for a single user, returning
    their variant assignments.
  inputs:
    type: object
    required:
    - deploymentKey
    properties:
      deploymentKey:
        type: string
        description: The deployment key used as the Authorization value (without the Api-Key prefix).
      userId:
        type: string
        description: The user ID to evaluate variants for.
      deviceId:
        type: string
        description: The device ID to evaluate variants for.
      userProperties:
        type: object
        description: User properties used for targeting rule evaluation.
  steps:
  - stepId: getFlagConfigs
    description: >-
      Download all flag configurations for local evaluation including targeting
      rules, variants, and segment definitions.
    operationId: getFlags
    parameters:
    - name: Authorization
      in: header
      value: "Api-Key $inputs.deploymentKey"
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      flagConfigurations: $response.body
  - stepId: evaluateUser
    description: >-
      Remotely evaluate all active experiments and feature flags for the
      supplied user, returning the variant assignments. Amplitude tracks an
      assignment event for each evaluation.
    operationId: evaluateVariants
    parameters:
    - name: Authorization
      in: header
      value: "Api-Key $inputs.deploymentKey"
    requestBody:
      contentType: application/json
      payload:
        user_id: $inputs.userId
        device_id: $inputs.deviceId
        user_properties: $inputs.userProperties
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      variants: $response.body
  outputs:
    flagConfigurations: $steps.getFlagConfigs.outputs.flagConfigurations
    variants: $steps.evaluateUser.outputs.variants