Writing documents for agents. Use when creating or editing skills, or modifying AGENTS.md or CLAUDE.md.
Find where a codebase actually costs time by mining its git history (Tornhill hotspot analysis). Produces ranked refactoring targets with evidence, change-coupling seams, and a do-not-refactor list; re-run after refactoring to verify it paid off.
Demos working software: first proves every claimed behavior by exercising the real artifact, then replays the proof as a slow, voice-narrated walkthrough. Use when the user asks for a demo or to be shown that something works.
Extracts what the session learned into prose that stands alone, or reviews existing text through the same distortion lenses.
Nullables — testing technique alternative to using mocking libraries. Use when writing unit tests, when code touches external I/O or state (HTTP, databases, files, clock, random) anywhere in its dependency chain, when making a system testable, or when tests…
Bash script style guide. Always use when writing bash scripts, shell scripts, or CLI bash tools.
Drive a browser from the terminal with playwright-cli: snapshot the page, then act on elements by ref. Use when automating browser interactions, filling web forms, testing UIs, or driving logged-in web apps from the command line.
Facilitates deep, structured learning of a topic — gathering source material, assessing the learner's gaps, then teaching through guided Socratic sessions. Use when someone wants to genuinely study or be tutored on a subject over time, not get a quick answer.