> ## Documentation Index
> Fetch the complete documentation index at: https://docs.artbucket.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Define a field

> Scope: `write`.



## OpenAPI

````yaml /openapi.json post /api/v1/fields
openapi: 3.1.0
info:
  title: artbucket
  version: '1'
  description: >-
    Agent-first asset management. The web UI is built on this API and nothing
    else, beside signing in at /api/auth. Send `Authorization: Bearer <key>`: a
    key works in one workspace with one scope, and scopes are a ladder: read <
    propose < write < admin. People signed in to the app carry a session cookie
    instead, and their scope is what their grants add up to: on the
    organization, the workspace, or single collections and assets. A scope shown
    as needed on the workspace is also enough on the one collection or asset a
    route acts on. Agents (MCP at POST /api/v1/mcp) usually get `propose`: what
    they add waits for a human.
servers:
  - url: http://localhost:3000
security:
  - bearer: []
  - session: []
  - {}
paths:
  /api/v1/fields:
    post:
      summary: Define a field
      description: 'Scope: `write`.'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                key:
                  type: string
                  pattern: ^[a-z][a-z0-9_]{0,39}$
                label:
                  type: string
                  minLength: 1
                  maxLength: 80
                type:
                  type: string
                  enum:
                    - text
                    - number
                    - date
                    - boolean
                    - select
                options:
                  default: []
                  maxItems: 100
                  type: array
                  items:
                    type: string
                    minLength: 1
                    maxLength: 80
                required:
                  default: false
                  type: boolean
                position:
                  default: 0
                  type: integer
                  minimum: -9007199254740991
                  maximum: 9007199254740991
              required:
                - key
                - label
                - type
              additionalProperties: false
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      key:
                        type: string
                      label:
                        type: string
                      type:
                        type: string
                        enum:
                          - text
                          - number
                          - date
                          - boolean
                          - select
                      options:
                        type: array
                        items:
                          type: string
                      required:
                        type: boolean
                    required:
                      - key
                      - label
                      - type
                      - options
                      - required
                    additionalProperties: false
                required:
                  - data
                additionalProperties: false
        default:
          description: An error
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: object
                    properties:
                      code:
                        type: string
                      message:
                        type: string
                      detail: {}
                    required:
                      - code
                      - message
                    additionalProperties: false
                required:
                  - error
                additionalProperties: false
components:
  securitySchemes:
    bearer:
      type: http
      scheme: bearer
      description: 'An API key: ab_...'
    session:
      type: apiKey
      in: cookie
      name: better-auth.session_token
      description: Signed in, at /api/auth

````