---
title: "Open a new blank document as a tab in the session."
method: POST
path: "/v1/sessions/{session_id}/documents/blank"
tags: ["v1", "sessions"]
---

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

`POST /v1/sessions/{session_id}/documents/blank`

## Request

- Base URL: `https://api.superdocs.app`
- URL: `https://api.superdocs.app/v1/sessions/{session_id}/documents/blank`
- Auth: HTTP bearer

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).

## Path parameters

- `session_id` string, required

## Headers

- `authorization` string, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/superdocs/apis/universal-document-ai-api.md) · [All operations](https://skmtc.dev/superdocs/apis/universal-document-ai-api/llms.txt) · [OpenAPI document](https://skmtc.dev/superdocs/apis/universal-document-ai-api/revisions/37d03122940b?raw)