Simon Willison • 2/6/2026

Running Pydantic's Monty Rust sandboxed Python subset in WebAssembly

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This technical article details the process of compiling and running Pydantic's Monty—a Rust-based, sandboxed subset of Python designed for safely executing LLM-generated code—within WebAssembly. It covers the project's goals of low-latency, secure code execution, provides code examples for local and browser-based testing with Pyodide, and discusses the practical implications for AI agents and web development.

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#Python #rust #Webassembly
Running Pydantic's Monty Rust sandboxed Python subset in WebAssembly

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