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

# Create Sub Issue



## OpenAPI

````yaml /actionkit/openapi.json POST /projects/{project_id}/tools/#LINEAR_CREATE_SUB_ISSUE
openapi: 3.0.0
info:
  title: ActionKit Tools API
  version: 1.0.0
servers:
  - url: https://actionkit.useparagon.com
    description: US Cloud
security: []
paths:
  /projects/{project_id}/tools/#LINEAR_CREATE_SUB_ISSUE:
    post:
      summary: Create Sub Issue
      parameters:
        - name: project_id
          in: path
          required: true
          schema:
            type: string
            description: >-
              Your Paragon Project ID. You can copy your Project ID from your
              dashboard URL or by clicking Copy Project ID under the Environment
              switcher.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                tool:
                  type: string
                  default: LINEAR_CREATE_SUB_ISSUE
                parameters:
                  type: object
                  properties:
                    parentId:
                      type: string
                      description: >-
                        Parent ID : Specify the Issue ID for the parent of this
                        new issue.
                    teamId:
                      type: string
                      description: Specify the team ID of the parent for this new issue
                    title:
                      type: string
                      description: 'Title : Specify a title for this issue.'
                    description:
                      type: string
                      description: 'Description : Specify a description for this issue.'
                    additionalFields:
                      type: object
                      description: >-
                        Additional Fields : Specify additional fields to include
                        on this project as JSON. For example, you may associate
                        the issue with a Project Lead here. See the docs
                        (https://studio.apollographql.com/public/Linear-API/schema/reference/objects/Project?variant=current)
                        for available fields. (example: "{
                          lead: <Linear User ID>
                        }")
                      properties: {}
                  required:
                    - parentId
                    - teamId
                    - title
                  x-integration: linear
              required:
                - tool
                - parameters
      responses:
        '200':
          description: Success
      security:
        - BearerAuth: []
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >-
        Your [Paragon User
        Token](/getting-started/installing-the-connect-sdk#setup) (JWT), which
        you can generate using your project's signing keys.

````