openapi: 3.1.0
info:
  title: Kanban Tool API v3 Attachments Attachments.json API
  description: Minimal OpenAPI 3.1 description of the Kanban Tool REST API v3 covering users, boards, tasks, subtasks, comments, attachments, and time trackers.
  version: 3.0.0
servers:
- url: https://YOUR_DOMAIN.kanbantool.com/api/v3
  description: Kanban Tool account API base
tags:
- name: Attachments.json
paths:
  /attachments.json:
    post:
      summary: Upload attachment
      operationId: createAttachment
      requestBody:
        content:
          multipart/form-data:
            schema:
              type: object
      responses:
        '201':
          description: Created
      tags:
      - Attachments.json
x-generated-from: https://kanbantool.com/developer/api-v3
x-generated-by: claude-crawl-2026-05-08