Matt Pocock

Sandcastle is a TypeScript tool for orchestrating locally sandboxed coding agents. It runs agents (Claude, Codex, OpenCode) inside Docker containers with full offline support, patching commits made in the sandbox back to the host. Developers can build complex multi-agent workflows entirely in TypeScript.

Working on a tool that orchestrates locally sandboxed coding agents in TypeScript

- Sandboxed in Docker
- 100% offline: commits made in the sandbox get patched back to the host
- Build complex workflows in Typescript
- Claude, Codex, OpenCode

It's called Sandcastle

<p>Working on a tool that orchestrates locally sandboxed coding agents in TypeScript

- Sandboxed in Docker
- 100% offline: commits made in the sandbox get patched back to the host
- Build complex workflows in Typescript
- Claude, Codex, OpenCode

It's called Sandcastle</p>