Wasi Python

Wasi Python is a secure Python sandbox for AI-generated code with the scientific stack inside.

wasi-python is CPython compiled to WebAssembly as one static binary that includes numpy, pandas, scipy, scikit-learn, statsmodels, matplotlib, and over forty other packages. It runs code that AI agents generate, keeping untrusted code apart from the host process by providing no default host file or network access. Users can run it from Python with one pip install or load the binary into any WebAssembly host that supports exception handling. The sandbox enforces limits on instructions, time, memory, output, and open files, and allows developers to bring custom tools. It maintains state across turns using sessions and supports async execution on worker threads.

Wasi Python at a glance

Best for: Software engineer
Runs on: Python, Linux, macOS, Windows, WebAssembly
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/claygendron/wasi-python

Key features

Compiles CPython to WebAssembly
Includes numpy, pandas, scipy, and scikit-learn
Isolates untrusted code from host files and network
Enforces strict limits on memory, time, and instructions
Passes custom tools from the host program
Maintains interpreter state across turns
Supports async execution on worker threads

Use it for

Running AI-generated code safely in an isolated environment
Executing scientific computing tasks with numpy and pandas
Passing custom host functions as tools to guest code
Maintaining interpreter state across multiple turns

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