Capsule

Capsule is an open-source runtime that executes untrusted code in secure, isolated environments using WebAssembly (Wasm) sandboxes. It is designed for developers who need to safely run Python or TypeScript/JavaScript code blocks with strict resource controls, such as CPU, memory, and allowed network/filesystem access. Capsule provides automatic retries, task lifecycle tracking, and lets you run tasks both via CLI and programmatically, making it ideal for building robust automation, data pipelines, and sandboxed extensions.