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

# Create a comment thread



## OpenAPI

````yaml /api/openapi.json post /api/v1/canvases/{canvasId}/comment-threads
openapi: 3.0.2
info:
  title: Melius API
  version: '1'
  description: >-
    The Melius REST API. Authenticate with an API key as a bearer token
    (`Authorization: Bearer mel_...`) and select the team to act on with the
    `x-team-id` header. Generations run through the same node + run pipeline as
    the app: create a node on a canvas, start a run, poll the run, then read the
    resulting version asset.
servers:
  - url: https://api.melius.com
security:
  - apiKey: []
    teamId: []
paths:
  /api/v1/canvases/{canvasId}/comment-threads:
    post:
      tags:
        - comment
      summary: Create a comment thread
      operationId: comment.create
      parameters:
        - name: canvasId
          in: path
          required: true
          schema:
            type: string
            format: uuid
      requestBody:
        description: Body
        content:
          application/json:
            schema:
              type: object
              properties:
                position:
                  type: object
                  properties:
                    x:
                      type: number
                    'y':
                      type: number
                  required:
                    - x
                    - 'y'
                body:
                  type: string
                  minLength: 1
                  maxLength: 10000
              required:
                - position
                - body
      responses:
        '201':
          description: '201'
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    format: uuid
                  canvasId:
                    type: string
                    format: uuid
                  position:
                    type: object
                    properties:
                      x:
                        type: number
                      'y':
                        type: number
                    required:
                      - x
                      - 'y'
                  isResolved:
                    type: boolean
                  createdByUserId:
                    type: string
                    format: uuid
                  createdByName:
                    type: string
                  createdAt:
                    type: string
                    format: date-time
                  updatedAt:
                    type: string
                    format: date-time
                  comments:
                    type: array
                    items:
                      type: object
                      properties:
                        id:
                          type: string
                          format: uuid
                        threadId:
                          type: string
                          format: uuid
                        body:
                          type: string
                        createdByUserId:
                          type: string
                          format: uuid
                        createdByName:
                          type: string
                        createdAt:
                          type: string
                          format: date-time
                        updatedAt:
                          type: string
                          format: date-time
                      required:
                        - id
                        - threadId
                        - body
                        - createdByUserId
                        - createdByName
                        - createdAt
                        - updatedAt
                required:
                  - id
                  - canvasId
                  - position
                  - isResolved
                  - createdByUserId
                  - createdByName
                  - createdAt
                  - updatedAt
                  - comments
        '401':
          description: Missing, invalid, expired, or revoked API key.
          content:
            application/json:
              schema:
                type: object
                properties:
                  statusCode:
                    type: integer
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - statusCode
                  - message
        '403':
          description: The API key's user is not a member of the requested team.
          content:
            application/json:
              schema:
                type: object
                properties:
                  statusCode:
                    type: integer
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - statusCode
                  - message
        '429':
          description: Rate limit reached — retry after the `Retry-After` header.
          headers:
            Retry-After:
              description: Seconds to wait before retrying.
              schema:
                type: integer
          content:
            application/json:
              schema:
                type: object
                properties:
                  statusCode:
                    type: integer
                  error:
                    type: string
                  message:
                    type: string
                  retryAfterSeconds:
                    type: integer
                required:
                  - statusCode
                  - message
components:
  securitySchemes:
    apiKey:
      type: http
      scheme: bearer
      description: 'A Melius API key (`mel_...`), sent as `Authorization: Bearer <key>`.'
    teamId:
      type: apiKey
      in: header
      name: x-team-id
      description: The team (workspace) to act on. Defaults to the key's team when omitted.

````