How much should you trust vibe-coded Python-to-Lean elaboration pipelines?

ezyang · x · 2026-11-09

ezyang asks: if you have a pile of vibe-coded Python scripts elaborating your Python program's trace into Lean, how much do you trust that TCB? If not, will you write a formal semantics of Python — and would you trust that (cough, Starlark)? A pointed question about the trust foundations of LLM-driven formal verification workflows.

Related event: Anthropic's assembly-level formal verification with Claude draws ezyang's TCB questions(6 posts)→

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