Sandbox SDK: One API for E2B, Daytona, Vercel and More

Giving an AI agent a sandbox where it can run code is now table stakes for agent apps. The trouble is that the market is fragmenting fast. E2B, Daytona, Vercel Sandbox, Upstash Box and Railway all have their own sandboxes, each with its own SDK, command model and file interface. Pick one and your code is welded to it.

The open-source Sandbox SDK wants to be the universal socket for this layer. It is an MIT-licensed TypeScript library with one typed API for the common operations: running commands, reading and writing files, background processes, port previews and snapshots. Moving from a local sandbox to E2B means swapping the provider import and factory; application code stays the same. The project calls it switching providers in one line.

The provider list is longer than the pitch suggests. Beyond E2B, Daytona, Vercel, Upstash and Railway, it covers Tenki, Freestyle, Superserve, boxd and others, plus local sandboxes on Docker or agentOS, so development and CI can cost nothing. The core package has no runtime dependencies, and providers that need an official SDK load it only on first use. It ships ready-made tool definitions for the Vercel AI SDK, Mastra and OpenAI's agent framework, along with an agent skill so coding agents know how to use it on their own.

The classic mistake for abstraction layers is pretending every provider is the same. Sandbox SDK is more honest. It publishes a capability matrix that spells out which providers support stdin, which can expose public ports, which have GPUs and which can only restore a snapshot into a new sandbox. Anything the unified interface does not cover is reachable through sandbox.raw and the native SDK. Every adapter also has to pass the same conformance suite, which is far more convincing than a blanket "fully compatible."

For developers, the first payoff is leverage. Sandboxes bill by the second, and price and cold-start speed vary a lot between providers. Being able to switch at will means picking the cheapest or fastest one per workload, and not worrying when a vendor raises prices or shuts down. For the industry, it signals that sandboxes are becoming infrastructure like databases and object storage, and mature infrastructure tends to grow a common abstraction layer.

An abstraction layer is a dependency too, of course. The project is young, and keeping pace with API changes across more than a dozen providers is the real test ahead.