Mutation Testing Evolves for the Age of AI Agents

Trail of Bits introduces MuTON and mewt, next-generation mutation testing tools designed for AI-assisted development and security workflows. By moving beyond legacy regex-based approaches to Tree-sitter parsing and persistent result storage, these tools make mutation testing faster, more scalable, and more practical across multiple languages. The broader significance is strategic: as AI agents increasingly generate and review code, mutation testing becomes a critical mechanism for validating software quality—ensuring tests verify behavior, not just execution paths. 

https://blog.trailofbits.com/2026/04/01/mutation-testing-for-the-agentic-era

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