Code review is the new bottleneck. Tests passing is no longer sufficient to trust the changes, and the (human) cost of evaluating the quality and robustness of new agent-written contributions is skyrocketing. We built Topos to evaluate code quality based on the structural properties of the programs themselves. We map your files to graphs (AST, CFG, CPG, MDG) and calculate metrics that can characterize how simple, composable, or secure your programs are. Agents can use this tool as they write and optimize based on your preferences. And yes, the inspiration for the repository is from category theory: this is inspired by a topos for program evaluation, that comes equipped with objects (program representations), morphisms (maps on graphs), probes, profunctors, test-coverage metrics, and a custom subobject classifier (Heyting algebra generated by the 3 pillars of evaluation) that affords a highly structured framework for awarding medals for program quality.GitHub: https://github.com/Krv-Labs/toposOpen Source. BSD-3 License. CLI, MCP Server VS Code Extension.