Show HN: Sandbox Agent SDK – unified API for automating coding agents
NathanFlurry Wednesday, January 28, 2026
We’ve been working with automating coding agents in sandboxes as of late. It’s bewildering how poorly standardized and difficult to use each agent varies between each other.
We open-sourced the Sandbox Agent SDK based on tools we built internally to solve 3 problems:
1. Universal agent API: interact with any coding agent using the same API
2. Running agents inside the sandbox: Agent Sandbox provides a Rust binary that serves the universal agent API over HTTP, instead of having to futz with undocumented interfaces
3. Universal session schema: persisting sessions is always problematic, since we don’t want the source of truth for the conversation to live inside the container in a schema we don’t control
Agent Sandbox SDK has:
- Any coding agent: Universal API to interact with all agents with full feature coverage
- Server or SDK mode: Run as an HTTP server or with the TypeScript SDK
- Universal session schema: Universal schema to store agent transcripts
- Supports your sandbox provider: Daytona, E2B, Vercel Sandboxes, and more
- Lightweight, portable Rust binary: Install anywhere with 1 curl command
- OpenAPI spec: Well documented and easy to integrate
We will be adding much more in the coming weeks – would love to hear any feedback or questions.