---
title: "Add Output Endpoint"
method: POST
path: "/sessions/{session_id}/outputs/add"
tags: ["sessions"]
---

# Add Output Endpoint

`POST /sessions/{session_id}/outputs/add`

## Request

- Base URL: `https://api.nicheangle.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.nicheangle.com/sessions/{session_id}/outputs/add`
- Auth: none declared

Add an output cell to a session that's at CP3+. Web-facing wrapper
over the same logic as the niche_add_output MCP tool. Idempotent on
(session_id, cell) — returns 200 with the existing Output when the
cell is already on the session.

Used by the filing sheet's "+ Add output" picker to drop in another
surface mid-review (e.g. session started with linkedin:text_post,
user reviews drafts, decides to also add instagram:carousel).

## Path parameters

- `session_id` string, uuid, required

## Headers

- `authorization` string, nullable

## Request body

- AddOutputRequest
  - `cell` string, required
  - `refresh` boolean

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/nicheangle/apis/signal-api.md) · [All operations](https://skmtc.dev/nicheangle/apis/signal-api/llms.txt) · [OpenAPI document](https://skmtc.dev/nicheangle/apis/signal-api/revisions/ed8b47ff5891?raw)