> ## Documentation Index
> Fetch the complete documentation index at: https://tbd-6fc993ce-mintlify-add-deploy-button-docs-27400.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Upload a browser extension

> Upload a zip file containing an unpacked browser extension. Optionally provide a unique name for later reference.



## OpenAPI

````yaml https://api.onkernel.com/spec.yaml post /extensions
openapi: 3.1.0
info:
  title: Kernel API
  description: Developer tools and cloud infrastructure for AI agents to use web browsers
  version: 0.1.0
servers:
  - url: https://api.onkernel.com
    description: API Server
security:
  - bearerAuth: []
tags:
  - name: Invocations
    description: Invoke actions and stream or query invocation status and events.
  - name: Browsers
    description: >-
      Create and manage browser sessions, filesystem, processes, logs, and
      replays.
  - name: Proxies
    description: Create and manage proxy configurations for routing browser traffic.
  - name: Deployments
    description: Create and manage app deployments and stream deployment events.
  - name: Apps
    description: List applications and versions.
  - name: Profiles
    description: Create, list, retrieve, and delete browser profiles.
  - name: Extensions
    description: Create, list, retrieve, and delete browser extensions.
  - name: Browser Pools
    description: Create and manage browser pools for acquiring and releasing browsers.
  - name: Agent Auth
    description: Agent authentication flow endpoints for hosted credential capture.
paths:
  /extensions:
    post:
      tags:
        - Extensions
      summary: Upload a browser extension
      description: >-
        Upload a zip file containing an unpacked browser extension. Optionally
        provide a unique name for later reference.
      operationId: postExtensions
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
                  description: ZIP file containing the browser extension.
                  example: '@path/to/extension.zip'
                name:
                  type: string
                  description: >-
                    Optional unique name within the organization to reference
                    this extension.
                  pattern: ^[A-Za-z0-9._-]{1,255}$
              required:
                - file
      responses:
        '201':
          description: Extension uploaded successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Extension'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '409':
          $ref: '#/components/responses/Conflict'
        '500':
          $ref: '#/components/responses/InternalError'
      security:
        - bearerAuth: []
components:
  schemas:
    Extension:
      type: object
      description: A browser extension uploaded to Kernel.
      properties:
        id:
          type: string
          description: Unique identifier for the extension
        name:
          type: string
          nullable: true
          description: >-
            Optional, easier-to-reference name for the extension. Must be unique
            within the organization.
        created_at:
          type: string
          format: date-time
          description: Timestamp when the extension was created
        size_bytes:
          type: integer
          description: Size of the extension archive in bytes
        last_used_at:
          type: string
          format: date-time
          nullable: true
          description: Timestamp when the extension was last used
      required:
        - id
        - created_at
        - size_bytes
    Error:
      type: object
      required:
        - code
        - message
      properties:
        code:
          type: string
          description: Application-specific error code (machine-readable)
          example: bad_request
        message:
          type: string
          description: Human-readable error description for debugging
          example: 'Missing required field: app_name'
        details:
          type: array
          description: Additional error details (for multiple errors)
          items:
            $ref: '#/components/schemas/ErrorDetail'
        inner_error:
          $ref: '#/components/schemas/ErrorDetail'
    ErrorDetail:
      type: object
      properties:
        code:
          type: string
          description: Lower-level error code providing more specific detail
          example: invalid_input
        message:
          type: string
          description: Further detail about the error
          example: Provided version string is not semver compliant
  responses:
    BadRequest:
      description: Bad Request – invalid input
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Unauthorized – missing or invalid authorization token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Forbidden:
      description: Forbidden – insufficient permissions or plan
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Conflict:
      description: Conflict – resource already exists
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    InternalError:
      description: Internal Server Error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

````