openapi: 3.0.3
info:
  title: Microsoft Project Online REST Assignments Workflow Activities API
  description: REST API for accessing and managing Microsoft Project Online and Project Server data including projects, tasks, resources, assignments, calendars, custom fields, timesheets, lookup tables, and workflow activities. Uses SharePoint-based REST endpoints via the ProjectServer service.
  version: '1.0'
  contact:
    name: Microsoft Project Support
    url: https://support.microsoft.com/
  license:
    name: Microsoft API License
    url: https://www.microsoft.com/en-us/legal/terms-of-use
  x-generated-from: documentation
  x-last-validated: '2026-04-18'
servers:
- url: https://{tenant}.sharepoint.com/sites/pwa/_api/ProjectServer
  description: Project Online REST API
  variables:
    tenant:
      default: contoso
      description: SharePoint tenant name
security:
- oauth2: []
tags:
- name: Workflow Activities
  description: Manage workflow activities
paths:
  /WorkflowActivities:
    get:
      operationId: listWorkflowActivities
      summary: Microsoft Project List Workflow Activities
      description: Retrieve all workflow activities.
      tags:
      - Workflow Activities
      responses:
        '200':
          description: List of workflow activities
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WorkflowActivityCollection'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    WorkflowActivityCollection:
      type: object
      properties:
        value:
          type: array
          items:
            $ref: '#/components/schemas/WorkflowActivity'
    WorkflowActivity:
      type: object
      properties:
        Id:
          type: string
          format: uuid
          description: Activity identifier
        Name:
          type: string
          description: Activity name
        Description:
          type: string
          description: Activity description
  securitySchemes:
    oauth2:
      type: oauth2
      description: OAuth 2.0 authentication via Azure AD for SharePoint Online
      flows:
        authorizationCode:
          authorizationUrl: https://login.microsoftonline.com/common/oauth2/authorize
          tokenUrl: https://login.microsoftonline.com/common/oauth2/token
          scopes:
            ProjectServer.Read: Read Project Server data
            ProjectServer.ReadWrite: Read and write Project Server data