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Sandcastle
Sandcastle is a TypeScript library for orchestrating AI coding agents in isolated sandboxes with automated branch strategies.
Sandcastle is a TypeScript library designed to orchestrate AI coding agents in isolated sandboxes. It handles environment sandboxing using a configurable branch strategy and merges resulting commits back. The library ships with built-in providers for Docker, Podman, Vercel, and a no-sandbox option, while also allowing custom provider creation. Developers can run agents using a single programmatic function, create reusable sandboxes, or manage independent git worktrees. It is well-suited for parallelizing multiple agents, setting up review pipelines, and running automated tasks securely.
Sandcastle at a glance
Key features
- Run agents with a single sandcastle.run() call
- Isolated sandboxes using Docker, Podman, or Vercel
- Configurable branch strategies and automated merges
- Reusable sandboxes via createSandbox()
- Independent worktree management via createWorktree()
- Support for custom sandbox providers
- Interactive session support
Use it for
- Parallelizing multiple background AI coding agents
- Creating automated agent review pipelines
- Orchestrating custom coding agents in TypeScript
- Running multi-step agent and verification workflows
Alternatives to Sandcastle
- Agent Sandbox — Provides a secure and isolated execution layer for autonomous AI agents.
- AIO Sandbox — Provides an integrated environment for agents in a single Docker container.
- Daytona — It provisions sandboxes in under 90 milliseconds with full security isolation.
- OpenSandbox — Provides isolated environments with multi-language SDKs and lifecycle management.
- CubeSandbox — Provides sub-60ms cold starts and hardware-level microVM kernel isolation.
- AI Sandboxes by Buddy — Stateful virtual machines with persistent disks and public HTTPS endpoints.
- Eve — Builds durable AI agents with file system based configuration and isolated sandboxes.
- jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
- Sandbase Harness — It keeps agent infrastructure local, secure, and fully auditable.
- Composio — Equips AI agents with tools, managed user auth, and sandboxes across 1,500+ apps
- AG-UI — Standardizes agent-user interactions and generative UI for applications.
- AI SDK — Switch providers easily and stream real-time responses without custom parsing.
All Sandcastle alternatives