Use before any creative/build work — adding features, building components, new functionality, or changing behavior. Turns a brief or vague idea into an approved design doc through one-question-at-a-time dialogue. Does NOT write code until the design is approved. Output is the design doc; the next step is owned by the caller.
Craft a clear /goal condition for Claude Code's autonomous mode from a rough task description.
Convene an independent cross-model judge — a model of a different family (e.g. Codex/GPT, Gemini, or a Cursor agent pinned to a non-Claude model), whichever CLI is installed — to cross-examine an artifact (a decision, a diff, a document, or a research answer) and adjudicate its findings disbelieve-it-back. This is the cross-model *mechanism*; the caller brings the artifact and its own in-family review. Use via `vet` (code), `research-council` (research), `plan` (a design decision), or directly when you want a second opinion from a model that doesn't share your blind spots. It reviews; it never edits.
Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
Reference for writing and editing skills well — the vocabulary and principles that make a skill predictable.
Build and sharpen a project's domain model. Use when the user wants to pin down domain terminology or a ubiquitous language, record an architectural decision, or when another skill needs to maintain the domain model.
Execute an approved implementation spec by delegating the coding to a cheaper/faster headless agent CLI (cursor-agent, codex, or a cheaper claude) while the main agent plans, verifies, and owns the merge. Use when you have a clear, self-contained task or plan and want another agent to write the code instead of doing it inline — for cross-family diversity, parallelism, or cost on large/repetitive work — e.g. 'have cursor do this', 'delegate this to cursor-agent', 'let codex implement this', 'let the cheap model write it', or any time the implementation is well-specified and mechanical enough to hand off. Also invoke explicitly as /delegate-coding. Does NOT write the plan; pair it with `plan` / `writing-plans` upstream.
A disciplined loop for hard bugs and performance regressions — reproduce, build a fast deterministic feedback loop, minimise, hypothesise, instrument, fix, and add a regression test. Use when facing a hard bug, an intermittent failure, or a performance regression.