Mex
Mex is a persistent memory tool for AI coding agents that maintains a living map of how a codebase actually works -- its functions, files, and the relationships between them -- and flags drift when the code changes but the documentation describing it does not, for example when a function is renamed but a doc still references the old name.
Mex complements Beads: where Beads tracks what work remains to be done across sessions, mex tracks what the code itself does, keeping an agent's understanding of the project synchronized with reality rather than rediscovering architecture from scratch each session. It has no confirmed first-person production use yet, so it is placed in Assess.
