Superagent

Launch YC: VibeKit – Run coding agents in a secure sandbox

Hi YC 👋 We’re Alan and Ismail, the founders of Superagent (YC W24). We build tools for developers working with agents — especially coding agents.

Today, we’re launching VibeKit, our open-source SDK that lets you run coding agents like OpenAI Codex or Claude Code safely in secure sandboxes.

Local setups work great for developing with coding agents — we’ve used them ourselves. But as soon as you want to embed agents into your app, automate GitHub workflows, or run tasks in isolated environments, you need something more flexible and secure.

VibeKit makes this possible. It supports multiple sandbox providers (E2B today; Daytona, Modal, and Fly.io coming soon) and gives you:

• ✅ Safe, isolated code execution
• ✅ Live output streaming
• ✅ Async run handling
• ✅ Full prompt + code history
• ✅ Telemetry and tracing
• ✅ GitHub-safe automations

With VibeKit, coding agents can install packages, modify files, or create PRs — all without touching your local or production systems.

https://youtu.be/GQaOSEbvOxM

We originally built VibeKit for internal use while developing Superagent. Since then we’ve used it to:

• Embed coding agents inside apps
• Build GitHub bots that open issues and PRs
• Automate internal workflows (e.g. adding PostHog)

Now it’s fully open source (MIT licensed) and available for anyone to use.

🌐 vibekit.sh

💻 github.com/superagent-ai/vibekit

🙏 Our Ask

• ⭐️ Star the repo
• 🧪 Try embedding a coding agent in your app
• 💬 Tell us what use cases it unlocked for you — email founders@superagent.sh