Mutation testing for the agentic era

Code coverage is one of the most dangerous quality metrics in software testing. Many developers fail to realize that code coverage lies by omission: it measures execution, not verification. Test suites with high coverage can obfuscate the fact that critical functionality is untested as software develops over time. We saw this when mutation testing uncovered a high-severity Arkis protocol vulnerability, overlooked by coverage metrics, that would have allowed attackers to drain funds. Today, we’re