Course builder

Builds a course on any subject for one learner. It writes the placement exam first: three to six strands, each starting in the middle and moving up or down with every answer, with written questions graded against a rubric, and a result that is a route through the course rather than a score. The modules are then written by a language model to a fixed specification, shorter where the learner placed high and fuller where they placed low, and a checker rejects any quiz question whose answer is not in the module's own text. The finished course runs in a static web app with a quiz engine, written-answer grading and a progress record. Thirteen courses so far, from the history of technology and linear algebra to Spanish and dog training: 92 modules and 12 placement exams. The engine, the checker and the Claude Code skill are open source under MIT.