> ## 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.

# Execute a command synchronously



## OpenAPI

````yaml https://api.onkernel.com/spec.yaml post /browsers/{id}/process/exec
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:
  /browsers/{id}/process/exec:
    post:
      tags:
        - Browsers
      summary: Execute a command synchronously
      operationId: processExec
      parameters:
        - name: id
          in: path
          required: true
          description: Browser session ID
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ProcessExecRequest'
      responses:
        '200':
          description: Execution result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ProcessExecResult'
        '400':
          $ref: '#/components/responses/BadRequest'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalError'
      security:
        - bearerAuth: []
components:
  schemas:
    ProcessExecRequest:
      type: object
      description: Request to execute a command synchronously.
      required:
        - command
      properties:
        command:
          type: string
          description: Executable or shell command to run.
        args:
          type: array
          description: Command arguments.
          items:
            type: string
          default: []
        cwd:
          type: string
          description: Working directory (absolute path) to run the command in.
          nullable: true
          pattern: ^/.*
        env:
          type: object
          description: Environment variables to set for the process.
          additionalProperties:
            type: string
          default: {}
        as_user:
          type: string
          description: Run the process as this user.
          nullable: true
        as_root:
          type: boolean
          description: Run the process with root privileges.
          default: false
        timeout_sec:
          type: integer
          description: Maximum execution time in seconds.
          nullable: true
      additionalProperties: false
    ProcessExecResult:
      type: object
      description: Result of a synchronous command execution.
      properties:
        exit_code:
          type: integer
          description: Process exit code.
        stdout_b64:
          type: string
          description: Base64-encoded stdout buffer.
        stderr_b64:
          type: string
          description: Base64-encoded stderr buffer.
        duration_ms:
          type: integer
          description: Execution duration in milliseconds.
      additionalProperties: false
    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'
    NotFound:
      description: Resource not found
      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

````