> ## Documentation Index
> Fetch the complete documentation index at: https://docs.superdocs.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Open a new blank document as a tab in the session.

> Open a fresh BLANK document as a new focused tab in the session (the tab-strip "+").
Non-billable — no AI, no upload pipeline; it is saved on first edit.
REST-only (a manual UI affordance, not an MCP tool — agents create documents through chat).



## OpenAPI

````yaml /openapi.json post /v1/sessions/{session_id}/documents/blank
openapi: 3.1.0
info:
  title: Universal Document AI API
  description: AI-powered document editing with multi-tenant organization support
  version: 2.0.0
servers: []
security: []
paths:
  /v1/sessions/{session_id}/documents/blank:
    post:
      tags:
        - v1
        - sessions
      summary: Open a new blank document as a tab in the session.
      description: >-
        Open a fresh BLANK document as a new focused tab in the session (the
        tab-strip "+").

        Non-billable — no AI, no upload pipeline; it is saved on first edit.

        REST-only (a manual UI affordance, not an MCP tool — agents create
        documents through chat).
      operationId: new_blank_document
      parameters:
        - name: session_id
          in: path
          required: true
          schema:
            type: string
            title: Session Id
        - name: authorization
          in: header
          required: false
          schema:
            anyOf:
              - type: string
              - type: 'null'
            title: Authorization
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      security:
        - HTTPBearer: []
components:
  schemas:
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
  securitySchemes:
    HTTPBearer:
      type: http
      scheme: bearer

````