Show HN: AST-guard – Fast, zero-cost structural checks for LLM code execution

Category: security

Tags: ast, llm-safety, code-execution

Score: 6.5/10 (Innovation: 7, Technical: 7, Documentation: 6, Utility: 6)

AST-guard is a deterministic, zero-cost structural analysis tool that sits between LLM code generation and execution, detecting structural hacks like hardcoding, forbidden calls, and complexity collapse via AST parsing. Its innovative combination of rule-based heuristics with pair/standalone modes fills a unique gap in AI safety tooling, and its multi-language support and CI integration make it practical for production pipelines.

Target audience: backend devs, devops, AI engineers

Repository: https://github.com/Nick-is-building/ast-guard · Python · MIT

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