Mutation testing for the agentic era

Code coverage metrics can be misleading because they measure whether code runs, not whether it's actually tested—a gap that mutation testing (introducing intentional bugs to check if tests catch them) can reveal. The article announces MuTON and mewt, new mutation testing tools designed for AI agents that work across multiple programming languages, addressing limitations of older regex-based tools like universalmutator that were slow and couldn't handle complex code patterns.