Show HN: Sandbox Agent SDK – unified API for automating coding agents

Summary

Run Coding Agents in Sandboxes. Control Them Over HTTP. A server that runs inside your sandbox. Your app connects remotely to control Claude Code, Codex, OpenCode, or Amp — streaming events, handling permissions, managing sessions. Documentation — API Reference — Discord Why Sandbox Agent? Running coding agents remotely is hard. Existing SDKs assume local execution, SSH breaks TTY handling and streaming, and every agent has a different API. Building from scratch means reimplementing everything for each coding agent. Sandbox Agent solves three problems: Coding agents need sandboxes — You can't let AI execute arbitrary code on your production servers. Coding agents need isolated environments, but existing SDKs assume local execution. Sandbox Agent is a server that runs inside the sandbox and exposes HTTP/SSE. Every coding agent is different — Claude Code, Codex, OpenCode, and Amp each have proprietary APIs, event formats, and behaviors. Swapping agents means rewriting your integration. Sandbox Agent provides one HTTP API — write your code once, swap agents with a config change. Sessions are ephemeral — Agent transcripts live in the sandbox. When the process ends, you lose everything. Sandbox Agent streams events in a universal schema to your storage. Persist to Postgres, ClickHouse, or Rivet. Replay later, audit everything. Features Universal Agent API : Single interface to control Claude Code, Codex, OpenCode, and Amp with full feature coverage : Single interface to control Claude Code, Codex, OpenCode, and Amp with full feature coverage Streaming Events : Real-time SSE stream of everything the agent does — tool calls, permission requests, file edits, and more : Real-time SSE stream of everything the agent does — tool calls, permission requests, file edits, and more Universal Session Schema : Standardized schema that normalizes all agent event formats for storage and replay : Standardized schema that normalizes all agent event formats for storage and replay Human-in-...