Aptitude Stack is an infrastructure for managing AI skills as versioned, composable artifacts, not loose marketplace entries.

Skills are kept atomic, and complex capabilities are built through dependency resolution, ensuring reuse and deterministic behavior. Each skill passes through an audit pipeline for security and quality, making execution verifiable rather than trust-based.

The system uses a database-backed architecture with hybrid lexical + semantic search for scalable, precise discovery. With strict versioning, users can pin stable behavior and avoid regressions as the ecosystem evolves.