Simon Willison: micropython-wasm 0.1a2 for sandboxed Python via WebAssembly

Category: Engineering post
Status: confirmed
Sources: simonwillison.net, post
Summary: Simon Willison released micropython-wasm 0.1a2, a Python library that runs a MicroPython interpreter inside a WebAssembly sandbox. The approach enables untrusted Python code execution without subprocess isolation or container overhead. The post details the architecture and limitations of the WASM boundary.
Why it matters: Lightweight sandboxed code execution is a common need in coding agents and tool-use environments; this provides a browser-and-server-compatible option without a full VM.