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

# Get accumulated dirty rectangles (VP0)

> Returns DXGI dirty rects accumulated since the last poll, in
capture-buffer coordinates `[x, y, w, h]`. Empty `rects` means no
visual change — agents can skip a vision model call. Pair with
ROI screenshot (`x,y,w,h`) to encode only changed regions.




## OpenAPI

````yaml /openapi.yaml get /v1/sessions/{sessionId}/dirty
openapi: 3.1.0
info:
  title: Glasswarp Platform API
  version: 1.0.0
  description: >
    Real-time visual access and native input control on Windows machines.

    See any screen. Control any PC. One API.


    ## Authentication


    All `/v1/*` endpoints require a bearer token:


    ```

    Authorization: Bearer gw_live_sk_...

    ```


    API keys are created in the [Console](/console/keys).

    Keys are scoped to your account and can access any rig with API access
    enabled.


    ## Base URL


    `https://signal.glasswarp.com`
  contact:
    name: Glasswarp
    url: https://glasswarp.com
  license:
    name: Proprietary
servers:
  - url: https://signal.glasswarp.com
    description: Production
security:
  - apiKey: []
paths:
  /v1/sessions/{sessionId}/dirty:
    get:
      tags:
        - Screenshots
      summary: Get accumulated dirty rectangles (VP0)
      description: |
        Returns DXGI dirty rects accumulated since the last poll, in
        capture-buffer coordinates `[x, y, w, h]`. Empty `rects` means no
        visual change — agents can skip a vision model call. Pair with
        ROI screenshot (`x,y,w,h`) to encode only changed regions.
      operationId: getDirtyRects
      parameters:
        - name: sessionId
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Dirty rects since last take
          content:
            application/json:
              schema:
                type: object
                properties:
                  width:
                    type: integer
                  height:
                    type: integer
                  rects:
                    type: array
                    items:
                      type: array
                      items:
                        type: integer
                      minItems: 4
                      maxItems: 4
        '504':
          description: Dirty request timed out
components:
  securitySchemes:
    apiKey:
      type: http
      scheme: bearer
      description: API key in the format `gw_(live|test)_sk_<hex>`

````