gz-new-component
Scaffold a new ECS component header under include/gz/sim/components/ and wire it into the install list.
mkdir -p ~/.claude/commands && curl -fsSL https://raw.githubusercontent.com/harunkurtdev/ros2-claude-code-template/HEAD/.claude/commands/gz-new-component.md -o ~/.claude/commands/gz-new-component.mdgz-new-component.md
Scaffold a new component in `gz-sim`. Arguments: * First token of `$ARGUMENTS` → `CamelCase` component name (required). * Second token (optional) → underlying C++ type (default: `double`). If `$ARGUMENTS` is empty, ask the user before doing anything. Steps: 1. Read the `new-component` skill end to end. 2. Verify `include/gz/sim/components/<CamelCase>.hh` does not already exist. 3. Write the header using the no-custom-serializer template from the skill (or ask the user if a `msgs` type is needed). 4. Add the new header alphabetically to `include/gz/sim/components/CMakeLists.txt`. 5. If the component is part of the public API, append a one-line entry under the next-release section of `Migration.md`. 6. Run `pre-commit run --files <every file you touched>`. 7. Report new files + suggest a unit test if behaviour was added. Do not register a custom serializer unless explicitly asked — most components don't need one.
Use proactively before opening a PR that adds or changes BehaviorTree.CPP nodes or BehaviorTree.ROS2 wrappers (RosActionNode/RosServiceNode/RosTopicPub/SubNode, TreeExecutionServer). Reviews a diff against BT.CPP v4 conventions — node base-class choice, non-blocking ticks, ports/blackboard typing, factory/plugin registration, XML v4, and the ROS 2 wrapper contract. Returns a punch list with file:line anchors, not a rewrite.
Use when a design decision touches Clean Architecture boundaries in a ROS 2 project — which layer a new behaviour belongs to, whether a port belongs in domain or application, whether a new node should be lifecycle-managed, whether to compose nodes or split packages. Returns an architectural recommendation with trade-offs, not implementation.
Use when a design decision touches the gz-sim ECS — where new state should live, which system phase should write it, how to avoid coupling, whether to add a component vs. a member variable, whether a new system should be split or merged with an existing one. Returns an architectural recommendation with trade-offs, not implementation.
Use proactively before opening any gz-sim PR. Reviews a diff against the project's C++17 style, ECS conventions, plugin registration patterns, CMake structure, test placement, Migration.md / Changelog.md expectations, and pre-commit configuration. Returns a punch list, not a rewrite.
Use proactively before opening a PR that adds or changes a ros2_control controller, broadcaster, or hardware component (incl. URDF <ros2_control> bringup). Reviews a diff against ros2_controllers / ros2_control_demos conventions — controller & hardware lifecycle, command/state interface configuration, real-time safety of update()/read()/write(), generate_parameter_library usage, pluginlib registration, chainable-controller correctness, URDF wiring, and tests. Returns a punch list with file:line anchors, not a rewrite.
Use proactively before opening any ROS 2 / Nav 2 PR. Reviews a diff against this template's Clean Architecture, ROS 2 communication, lifecycle, testing, and Nav 2 plugin conventions. Returns a punch list with file:line anchors, not a rewrite.
Use proactively before opening a PR that touches a VDA 5050 connector / fleet bridge. Reviews a diff against VDA 5050 v3.0.0 protocol compliance (topics, QoS, header rules, base/horizon, action state machine, schema validation) and the template's Clean Architecture for the MQTT↔Nav 2 bridge. Returns a punch list with file:line anchors, not a rewrite.
Build the colcon workspace (optionally a single package) and report the outcome.