Run Python code in a WebAssembly sandbox

til.simonwillison.net

I've been trying to figure this out for ages. Tim Bart responded to my call for help on Hacker News with this extremely useful code example showing how to run Python code in WebAssembly inside Python, using wasmtime-py and the new Python WASM build released by VMware Wasm Labs .

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Sandboxed Python executor for AI agents using WebAssembly

psiace.me Jul 8, 2025

A weekend hack to explore different sandboxing approaches for Code Agents, using wasmtime-py and VMware's Python WASM binary to run Python code locally. Works with smolagents.

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