---
title: "Create Folder"
method: POST
path: "/agents/folders"
tags: ["Folders"]
---

# Create Folder

`POST /agents/folders`

Create a [knowledge base](/line/knowledge-base) folder

## Headers

- `Cartesia-Version` '2026-03-01', date, required

## Request body

- CreateFolderBody
  - `name` string, required — A human-readable name for the folder. Must be unique among siblings.
  - `parent_id` string, nullable — ID of the parent folder. Omit or pass `null` to create a top-level folder. Folders can be nested at most three levels deep.

## Response `201`

Folder created.

- FolderResponse
  - `id` string, required — The ID of the folder.
  - `parent_id` string, nullable, required — The ID of the parent folder, or `null` for top-level folders.
  - `name` string, required — The folder's name.
  - `created_at` string, date-time, required — When the folder was created.
  - `agents` FolderAgentSummary[], required — Agents that have access to this folder.
    - `id` string, required — The ID of the agent.
    - `name` string, required — The name of the agent.
  - `documents` FolderDocumentSummary[], required — Documents inside this folder.
    - `id` string, required — The ID of the document.
    - `name` string, nullable, required — The document's display name, or `null` if unnamed.
    - `created_at` string, date-time, required — When the document was uploaded.
    - `metadata` object, required — User-defined string-keyed metadata.

## Other responses

- `400` — Bad request. Possible reasons: a folder with the same name already exists in the target location (`error_code: kb_folder_duplicate_name`), or nesting would exceed the three-level limit (`error_code: kb_folder_max_depth`).
- `404` — Parent folder not found (`error_code: kb_folder_parent_not_found`).

---

[API](https://skmtc.net/cartesia/apis/cartesia-api.md) · [All operations](https://skmtc.net/cartesia/apis/cartesia-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/cartesia/cartesia-api/versions/8910812440d3/schema)