Create a label

POSThttps://<your-url>/api/v2/labels

MCP id labels.storeAlso on this path: GET List labels

Creates a label on a project and returns it with a Location header.

Token scope: api:write:project_management
Without it: 403 insufficient-token-scope.
Permission: project_management::manage_work_items
Without it: 403 insufficient-permission.
Feature: Needs the sprints feature on your organisation.
Without it: 404 endpoint-not-found.
Rate cost: 1 unit, write bucket. A write costs the same whatever view you ask for.
Also: Accepts Idempotency-Key. Never cached: private, no-store. Unknown body keys are refused, never dropped.

Both are checked, scope first. A token never does more than its user. How access is checked

Request

Example: A blocked label, colour left to the server

curl -X POST \
  'https://<your-url>/api/v2/labels' \
  -H 'Authorization: Bearer <token>' \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: <key>' \
  -d '{
    "project_id": 1,
    "name": "Blocked"
  }'

const response = await fetch('https://<your-url>/api/v2/labels', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <token>',
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    'Idempotency-Key': '<key>',
  },
  body: JSON.stringify({
    "project_id": 1,
    "name": "Blocked"
  }),
});

use Illuminate\Support\Facades\Http;

$response = Http::withToken('<token>')
    ->acceptJson()
    ->withHeader('Idempotency-Key', '<key>')
    ->post('https://<your-url>/api/v2/labels', [
        'project_id' => 1,
        'name' => 'Blocked',
    ]);

import requests
response = requests.request(
    'POST',
    'https://<your-url>/api/v2/labels',
    headers={'Authorization': 'Bearer <token>', 'Accept': 'application/json', 'Content-Type': 'application/json', 'Idempotency-Key': '<key>'},
    json={'project_id': 1, 'name': 'Blocked'},
)

Response

The shape of the response, with sample values.

{
  "data": {
    "id": 1,
    "project_id": 1,
    "name": "Blocked",
    "color": "#ef4444",
    "icon": "heroicon-o-tag",
    "order": 1,
    "created_at": "2026-03-04T09:15:00Z",
    "updated_at": "2026-03-04T09:15:00Z",
    "links": {
      "self": "https://<your-url>/api/v2/work-items/1"
    }
  }
}

{
  "type": "https://developers.plnnrly.com/api/v2/problems/idempotency-key-in-flight",
  "title": "Idempotency key in flight",
  "status": 409,
  "detail": "The original request for this Idempotency-Key is still being processed. Retry shortly.",
  "instance": "/api/v2/worklogs",
  "request_id": "01K4B7Q9YV3PZ2N8T1E6M0XR4S"
}

{
  "type": "https://developers.plnnrly.com/api/v2/problems/validation-failed",
  "title": "Validation failed",
  "status": 422,
  "detail": "3 fields failed validation.",
  "instance": "/api/v2/worklogs",
  "request_id": "01K4B7Q9YV3PZ2N8T1E6M0XR4S",
  "errors": [
    {
      "pointer": "/date",
      "code": "date_format",
      "detail": "The date does not match the format Y-m-d."
    },
    {
      "pointer": "/minutes",
      "code": "min",
      "detail": "The minutes must be at least 1."
    },
    {
      "pointer": "/description",
      "code": "required",
      "detail": "The description field is required."
    }
  ]
}

color is optional: omit it and the server picks the first palette colour the project does not already use. order is not accepted: the new label is placed last within its project and is reordered only by dragging it in plnnrly. Attach the label to work items from the work-item side, with label_ids.

Query parameters

Unknown parameters are refused with 400, naming the parameter.

viewstring

Which field set to render.

summarydetaildefault

Request headers

X-Request-Idstringpattern

A correlation id of your own. It is recorded in our logs next to the server's request id but never returned: the response header always carries the server's id. A value that does not match the pattern is discarded silently, never rejected.

Idempotency-Keystring≤ 255

A caller-chosen key that makes this POST safe to retry. Replaying it returns the original response with Idempotency-Replayed: true.

Request body

Unknown keys are refused with 422, naming the key.

project_idinteger → Project.idRequired

The project this label belongs to. Follow GET /api/v2/projects/{project} for its details; the project is not expandable from here.

namestring≤ 255Required

Label name as shown on the chip, e.g. Blocked.

colorstring≤ 255

Six-digit hex colour, e.g. #ef4444. Stored verbatim: a row written before the colour picker enforced the format reads back as it is stored.

hex colour, e.g. #7c31e8

iconstring or null≤ 255pattern

Icon name, e.g. heroicon-o-tag: not a URL and not markup. Null when the label has no icon.

Response 201

Returns a Label in the detail view.

Headers

ETag: A strong validator of exactly this representation.
Idempotency-Replayed: true when this response was replayed from a stored Idempotency-Key rather than produced by a new write.
Location: The absolute URL of the created or queued resource.
RateLimit: The IETF httpapi-ratelimit-headers form of your remaining allowance on the tightest bucket this request touched.
RateLimit-Policy: The ceiling and window of that bucket, as <limit>;w=<seconds>.
X-Request-Id: The server-generated ULID correlating this response with our logs.

Every response also carries Cache-Control, Vary, X-Content-Type-Options, X-Plnnrly-Api-Version, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset. Headers and versioning