VibeKit is an open-source SDK designed for the secure execution of Codex and Claude Code agents within customizable sandboxes. This tool allows developers to seamlessly integrate coding agents into their applications or workflows through an easy-to-use drop-in SDK. By importing VibeKit and VibeKitConfig, users can invoke the generateCode function, providing prompts, modes, and streaming callbacks for real-time output management. VibeKit operates within fully isolated private sandboxes, offering customizable environments where users can install necessary packages, and it is model-agnostic, allowing for any compatible Codex or Claude model to be utilized. Furthermore, it efficiently streams agent output, preserves the entire history of prompts and code, and supports asynchronous execution handling. The integration with GitHub facilitates commits, branches, and pull requests, while telemetry and tracing features are enabled through OpenTelemetry. Currently, VibeKit is compatible with sandbox providers such as E2B, with plans to expand support to Daytona, Modal, Fly.io, and other platforms in the near future, ensuring flexibility for any runtime that adheres to specific security standards. Additionally, this versatility makes VibeKit an invaluable resource for developers looking to enhance their projects with advanced coding capabilities.