Useful Or Cut
Hostile usefulness filter for prose — use when drafting or editing a blog post, essay, or other written piece.
Optimize P95
Profiler-driven performance optimization loop using a dynamic workflow. Use ONLY when the user explicitly invokes /optimize-p95 or says "optimize p95" / "run the perf loop". Do not trigger for general performance questions.
Brownfield
Retrofit an EXISTING repo with a lean discipline contract — document reality, freeze decay, improve opportunistically. Use when onboarding an inherited or old codebase, or when the user says "onboard this repo", "brownfield", "retrofit", or "bring this old project under discipline".
Design Taste
Opinionated rules for view transitions, motion, and UI polish that prevent generic AI-generated design. Use when building or styling any web UI, adding animations, hover effects, page/route transitions, or when the user mentions view transitions, motion design, "AI slop", or making a site feel less generic.
Eval Discipline
How to write evals and build an eval harness the disciplined way — KPI-based evaluators, per-column reporting, no blended scores. Use when writing evals, building an eval harness, when the user says "add evals", "score this pipeline", or asks about KPI evaluation of an AI feature.
Crap Score
CRAP-metric reduction loop (CC^2 x (1-cov)^3 + CC) — score every function, then iterate cover-first/split-second until all are under threshold. Use ONLY when the user explicitly invokes /crap-score or says "run crap" / "crap score" / "reduce crap". Do not trigger for general code-quality talk.
Functional Light Js
Kyle Simpson's (getify) function craft from Functional-Light JS and You Don't Know JS. Use when writing or reviewing JavaScript/TypeScript functions, refactoring JS/TS code, or when the user mentions first-class functions, functional-light, or getify/Kyle Simpson.
Greenfield
Bootstrap a new project with a lean architecture contract. Use when creating a new project / repo from scratch, scaffolding a codebase, or when the user says "new project", "greenfield", "start a repo", or "set up a project skeleton".
Handoff
Compact the current session into the project's STATUS.md re-entry snapshot. Use when the user types /handoff or says 'hand off' / 'write the handoff'.
Design Canon
Full design-best-practices manual with per-engineer evidence profiles (Hashimoto, Zechner, Ronacher, Dax Raad, Willison). Use when designing architecture, making structural decisions, writing BLUEPRINT.md, or when the user says "design canon" or "check the manual".