22nd May 2026
Research
pydantic-monty investigation
— Reviewing `pydantic-monty` reveals it as a fast, minimal Python interpreter designed for controlled sandboxed execution, primarily useful when transforming data, branching, looping, and interacting with a select set of trusted host tools or a virtual filesystem. The interpreter purposefully omits large portions of CPython’s functionality, with clear boundaries: unsupported features and missing resources generally fail cleanly as structured errors rather than escaping into the host runtime.
It's been a few months since I last poked at Monty, the sandboxed subset of Python implemented in Rust. I had Claude Code look at the most recent release.
Importantly the max_duration_secs, max_memory, max_allocations, and max_recursion_depth settings all appear to work as advertised.
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