type: object
properties:
  chartId:
    type: string
    description: >-
      ID of the chart to update (works for master charts like 'chart_123' or
      action step charts like 'chart_456')
  newDueDate:
    type: string
    description: New due date as an ISO date string (e.g. '2026-09-30T12:00:00Z')
  redistributeActionSteps:
    type: boolean
    default: false
    description: >-
      When true, open action steps and telescoped child charts are redistributed
      evenly between now and the new due date. When false (default), their dates
      are left as the caller set them.
required:
  - chartId
  - newDueDate