Build, debug, and document CMDx tasks and workflows in Ruby. Use when creating service/command objects with CMDx, composing tasks into workflows, handling halts and faults, or wiring inputs, outputs, callbacks, middleware, retries, and configuration. Don't use for generic Ruby refactors, Rails controller work, or non-CMDx service objects.
Write, structure, and maintain RSpec specs for CMDx tasks, workflows, context, and configuration. Use when the user asks to add, update, fix, or refactor tests, write specs for new features, scaffold test files, or follow project testing conventions. Don't use for debugging production bugs, performance benchmarking, or non-test code changes.
Authors and structures Cursor slash-commands that automate recurring developer and AI-maintenance workflows. Use when creating new command files under .cursor/commands/, adding procedural steps, defining constraints, or optimizing command output tables. Do not use for skill authoring, agent definitions, hook scripts, or application code.
Explains selected code in depth — data flow, dependencies, side effects, and intent. Use when the user asks to explain, trace, walk through, or understand a function, method, class, module, or code block. Emphasizes how and why over what. Don't use for debugging, refactoring, performance tuning, or generating new code.
Systematically diagnose and resolve bugs, errors, and unexpected behavior in CMDx tasks, workflows, context, and runtime execution. Use when the user mentions a bug, error, unexpected result, failing test, exception, stack trace, wrong state, wrong status, nil value, or debugging. Don't use for feature additions, performance tuning, or test-only changes.
Profile, benchmark, and optimize CMDx task execution, context handling, and runtime hot paths. Use when the user mentions performance, benchmarking, profiling, memory allocation, optimization, slow execution, or YJIT. Don't use for general refactoring, feature additions, or test-only changes.
Authors and structures professional-grade agent skills following the agentskills.io spec. Use when creating new skill directories, drafting procedural instructions, or optimizing metadata for discoverability. Don't use for general documentation, non-agentic library code, or README files.
Write, update, and maintain YARD documentation and CHANGELOG entries for CMDx classes, modules, and methods. Use when the user asks to document, add YARD docs, update docs, write docstrings, add @param/@return tags, update CHANGELOG, or fix documentation inconsistencies. Don't use for README generation, non-agentic library docs, or code-only changes.