KeystoneSurvey this repository and explain what is true before we decide what to change.KeystoneReproduce this failing test and prove the root cause before proposing a fix.KeystoneReview this branch for correctness, regressions, security risks, and missing tests without editing it.

Keystone helps developers move from ambiguity to verified delivery with 9 focused skills for understanding codebases, planning changes, implementing and refactoring safely, diagnosing failures, reviewing work, and shipping with evidence. Each skill keeps the current phase explicit, protects user-owned work, and requires proof before completion claims.