pydantic/monty: Pydantic Ships Minimal Secure Rust Python Interpreter for AI Agents — 6.3K Stars

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The Pydantic team (builders of pydantic-ai) has released Monty, a Rust-implemented minimal Python interpreter specifically engineered for safe LLM code execution without containers. Startup time is single-digit microseconds vs hundreds of milliseconds for a full Python runtime; filesystem, network, and environment variables are blocked by default and only exposed via explicit host function calls. This directly solves the 'how do agents safely execute Python' problem that currently requires Docker or subprocess sandboxing — with resource limits on memory, stack depth, and execution time built in.