Azure Kubernetes Service Scale Node Pool

arazzo: 1.0.1
info:
  title: Azure Kubernetes Service Scale Node Pool
  summary: Read an agent pool, change its node count, and poll until the scale operation completes.
  description: >-
    Reads the current state of an agent pool, submits a create-or-update that
    sets a new node count, and then polls the agent pool Get endpoint until
    provisioningState reports Succeeded, looping while it is still Scaling.
    Every step inlines its request so the flow can be read and executed without
    opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: aksApi
  url: ../openapi/azure-kubernetes-service-openapi.yml
  type: openapi
workflows:
- workflowId: scale-node-pool
  summary: Change the node count of an AKS agent pool and wait for the scale to finish.
  description: >-
    Reads AgentPools_Get for the current count, applies AgentPools_CreateOrUpdate
    with the new count, then polls AgentPools_Get until provisioningState is
    Succeeded.
  inputs:
    type: object
    required:
    - subscriptionId
    - resourceGroupName
    - resourceName
    - agentPoolName
    - newNodeCount
    - accessToken
    properties:
      subscriptionId:
        type: string
        description: The ID of the target subscription (valid UUID).
      resourceGroupName:
        type: string
        description: The name of the resource group.
      resourceName:
        type: string
        description: The name of the managed cluster.
      agentPoolName:
        type: string
        description: The name of the agent pool to scale.
      newNodeCount:
        type: integer
        description: The desired number of nodes after scaling.
      apiVersion:
        type: string
        description: The AKS REST API version to use.
        default: '2025-10-01'
      accessToken:
        type: string
        description: An Azure AD bearer token with user_impersonation scope.
  steps:
  - stepId: readNodePool
    description: >-
      Read the agent pool to capture its current node count and VM size before
      changing the count.
    operationId: AgentPools_Get
    parameters:
    - name: subscriptionId
      in: path
      value: $inputs.subscriptionId
    - name: resourceGroupName
      in: path
      value: $inputs.resourceGroupName
    - name: resourceName
      in: path
      value: $inputs.resourceName
    - name: agentPoolName
      in: path
      value: $inputs.agentPoolName
    - name: api-version
      in: query
      value: $inputs.apiVersion
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      currentCount: $response.body#/properties/count
      vmSize: $response.body#/properties/vmSize
  - stepId: applyScale
    description: >-
      Submit a create-or-update setting the new count under the ARM properties
      object. A 200 indicates the scale request was accepted.
    operationId: AgentPools_CreateOrUpdate
    parameters:
    - name: subscriptionId
      in: path
      value: $inputs.subscriptionId
    - name: resourceGroupName
      in: path
      value: $inputs.resourceGroupName
    - name: resourceName
      in: path
      value: $inputs.resourceName
    - name: agentPoolName
      in: path
      value: $inputs.agentPoolName
    - name: api-version
      in: query
      value: $inputs.apiVersion
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    requestBody:
      contentType: application/json
      payload:
        properties:
          count: $inputs.newNodeCount
          vmSize: $steps.readNodePool.outputs.vmSize
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      provisioningState: $response.body#/properties/provisioningState
  - stepId: pollNodePool
    description: >-
      Read the agent pool and inspect provisioningState. While it is still
      Scaling the flow loops back to this step; once it reports Succeeded the
      workflow ends.
    operationId: AgentPools_Get
    parameters:
    - name: subscriptionId
      in: path
      value: $inputs.subscriptionId
    - name: resourceGroupName
      in: path
      value: $inputs.resourceGroupName
    - name: resourceName
      in: path
      value: $inputs.resourceName
    - name: agentPoolName
      in: path
      value: $inputs.agentPoolName
    - name: api-version
      in: query
      value: $inputs.apiVersion
    - name: Authorization
      in: header
      value: "Bearer $inputs.accessToken"
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      provisioningState: $response.body#/properties/provisioningState
      count: $response.body#/properties/count
    onSuccess:
    - name: scaleComplete
      type: end
      criteria:
      - context: $response.body
        condition: $.properties.provisioningState == "Succeeded"
        type: jsonpath
    - name: keepPolling
      type: goto
      stepId: pollNodePool
      criteria:
      - context: $response.body
        condition: $.properties.provisioningState != "Succeeded"
        type: jsonpath
  outputs:
    previousCount: $steps.readNodePool.outputs.currentCount
    provisioningState: $steps.pollNodePool.outputs.provisioningState
    finalCount: $steps.pollNodePool.outputs.count