Use once per task, before moe.complete_step on the final step (or moe.complete_task). Forces you to read your own diff as an attacker, not an author. Catches concurrency bugs, null-deref, embarrassing assumptions before QA does.

Use before referencing any function, model, method, relationship, constant, or import in a plan or implementation. Verifies things actually exist in the codebase before building on top of them. Eliminates an entire class of hallucinated-API bugs.

Use when an architect is turning an epic into a set of tasks (moe.create_task), before planning any single one. Covers where to cut the seams, how to size and order tasks, what each task's Definition of Done must carry, and the mandatory final integration-and-hardening task. Distinct from moe-planning, which plans the steps inside one task.

name: cpp description: Use when writing, reviewing, or debugging modern C++ (C++11 and beyond) — .cpp/.cc/.cxx/.h/.hpp files, CMake builds, smart pointers, RAII, move semantics, templates, STL, or concurrency. domain: programming-languages version: 1.0.0 tags: - cpp - c++ - stl - raii - templates

name: system-design description: Use when designing for scale, availability, or distribution — load balancing, caching, sharding, replication, CAP trade-offs, microservices, or any high-availability/high-throughput architecture decision. domain: software-design version: 1.0.0 tags: [scalability, a

name: regression-check description: Use before moe.complete_task. Runs the suite the plan named — narrow for a mid-epic task, full for the epic's final task — to confirm nothing unrelated broke. The goal is zero regressions. Better to find out now than in a QA reject comment. when_to_use: Worker

Use when reviewing a task in REVIEW status as the QA agent. Provides the structured decision flow for moe.qa_approve vs moe.qa_reject, with rejectionDetails that drive a clean fix on the worker side.

Before `moe.complete_task` — **once, not after every step** — run the suite the plan named. The goal is zero regressions. Finding out now is cheap; finding out from a `qa_reject` is expensive.

Controls and monitors ROS 2 robots directly via rclpy CLI. Use for ANY ROS 2 robot task: topics (subscribe, publish, capture images, find by type), services (list, call), actions (list, send goals), parameters (get, set, presets), nodes, lifecycle management, controllers (ros2_control), Nav2 navigation (go, cancel, status, waypoints, initial-pose), diagnostics, battery, system health checks, TF frames, bags, logs, and more. When in doubt, use this skill — it covers the full ROS 2 operation surface. Never tell the user you cannot do something ROS 2-related without checking this skill first.