Diagnosis loop for hard bugs and performance regressions. Use when the user says "diagnose"/"debug this", or reports something broken/throwing/failing/slow.
Functional shell conventions for POSIX sh, bash, and zsh. Use when writing or editing shell scripts (.sh/.bash) or zsh config (.zsh, prompts, hooks, completions, aliases).
Review the changes since a fixed point (commit, branch, tag, or merge-base) along two axes — Standards (does the code follow this repo's documented coding standards?) and Spec (does the code match what the originating issue/PRD asked for?). Runs both reviews in parallel sub-agents and reports them side by side. Use when the user wants to review a branch, a PR, work-in-progress changes, or asks to "review since X".
Shared vocabulary for designing deep modules. Use when the user wants to design or improve a module's interface, find deepening opportunities, decide where a seam goes, make code more testable or AI-navigable, or when another skill needs the deep-module vocabulary.
Compact the current conversation into a handoff document for another agent to pick up.
Implement a piece of work based on a spec or set of tickets.
Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.
Configure this repo for the engineering skills — set up its issue tracker, triage label vocabulary, and domain doc layout. Run once before first use of the other engineering skills.