Grammar Quest Backend: An Illustrated Tour
Visual-first tour of the Grammar Quest backend — pipeline timeline, data-shape diagrams, sprite cache decision path, eval harness flow, judge dimensions, CEFR matrix.
Grammar Errors That Mutate the Game World
Building an AI engine where your grammar errors mutate the game world in real time — and the architecture is stranger than you'd expect.
The Hidden Cost Curve: How Token Billing Really Works in Claude API
Real data from 315 Claude Code sessions reveals how context size, caching, and tool-use chains shape API costs. Interactive chart with 20K+ data points.