---
title: "Create a label"
method: POST
path: "/v1/labels"
tags: ["Labels"]
---

# Create a label

`POST /v1/labels`

## Request

- Base URL: `https://api.mails.ai`
- URL: `https://api.mails.ai/v1/labels`
- Auth: HTTP bearer

**Requires scope:** `manage` or `inbox` (`inbox` only in a signed-in dashboard session; no API key or app can hold it). A name (unique in the workspace, ignoring case) and a colour from a fixed palette of 12.

## Request body

- CreateLabelRequest
  - `name` string, required: Unique within the workspace, ignoring case. 1-64 characters.
  - `color` 'gray' | 'red' | 'orange' | 'amber' | 'yellow' | 'green' | 'teal' | 'cyan' | 'blue' | 'indigo' | 'purple' | 'pink': The label's colour, one of 12 palette names. Left out, it is `gray`.

## Response `201`

The created label.

- Label
  - `id` string, required: Label id (`lbl_…`).
  - `name` string, required: Unique in the workspace, ignoring case.
  - `color` 'gray' | 'red' | 'orange' | 'amber' | 'yellow' | 'green' | 'teal' | 'cyan' | 'blue' | 'indigo' | 'purple' | 'pink', required: The label's colour, one of 12 palette names: `gray` unless another was chosen.
  - `created_at` string, date-time, required: When the label was created (UTC).
  - `updated_at` string, date-time, required: When the label was last changed with PATCH, even by a request that left it as it was. Equal to `created_at` on a label never patched.

## Other responses

- `400`: Invalid request — malformed JSON or a field failed validation. Also `feature_not_enabled` when this server has a feature switched off (custom domains before they are available).
- `401`: Missing or invalid API key.
- `403`: The API key lacks the required scope (`insufficient_scope`), or the token belongs to an app connected by sign-in and this operation is closed to connected apps (`connected_app_not_allowed`).
- `409`: Conflict — duplicate resource, an in-progress idempotent request, a draft or scheduled message that started sending while it was being changed, or a thread deleted for good while one of its messages is being sent (`duplicate_resource`); or an agent name more than one agent has (`agent_name_conflict`: use the agent's id); or a status change on an archived agent, since archiving cannot be undone (`agent_archived`).
- `500`: Internal server error.

---

[API](https://skmtc.dev/mails/apis/mails-ai-api.md) · [All operations](https://skmtc.dev/mails/apis/mails-ai-api/llms.txt) · [OpenAPI document](https://skmtc.dev/mails/apis/mails-ai-api/revisions/4d4930a8c33b?raw)