sandcastle

Give agents an operating system as a library. Runs in your existing backend – no sandboxes, VMs, or SaaS. Powered by WebAssembly & V8 isolates.

Sandbox your LLM coding agents on macOS so they can only touch the files they need. Useful for ai-agents and claude-code use cases.

Intelligent automation and orchestration of multiple agents streamline workflows for efficient coding with Claude Code, enabling users to automate tasks and enhance productivity easily.

Drop-in AGENTS.md that makes every coding agent behave like a senior engineer instead of an eager intern. Kills sycophancy, stops drive-by refactors, forces verification loops. Synthesizes Karpathy's four principles and Boris Cherny's Claude Code workflow. Works with Claude Code, Codex, Gemini CLI, Cursor, and the open standard.

An open source distributed agent runtime

This tool efficiently manages multiple tasks by coordinating different command line interfaces, allowing for faster and smarter execution of processes. It intelligently routes tasks based on context, enhancing productivity and performance.