# Ros2 Engineering Skills

> >

- **Type:** Skill
- **Install:** `agentstack add skill-dbwls99706-ros2-engineering-skills-ros2-engineering-skills`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [dbwls99706](https://agentstack.voostack.com/s/dbwls99706)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** Apache-2.0
- **Upstream author:** [dbwls99706](https://github.com/dbwls99706)
- **Source:** https://github.com/dbwls99706/ros2-engineering-skills

## Install

```sh
agentstack add skill-dbwls99706-ros2-engineering-skills-ros2-engineering-skills
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# ROS 2 Engineering Skills

> **Single responsibility:** This skill is an **API reference & code template guide**
> for ROS 2 development. It tells you *how to use ROS 2 APIs correctly* and
> *what mistakes to avoid*. It does NOT do CI/CD orchestration, incident response,
> data analysis, or deployment automation — those are separate skill categories.

A progressive-disclosure skill for ROS 2 development — from first workspace to
production fleet deployment. Each section below gives you the essential decision
framework; detailed patterns, code templates, and anti-patterns live in the
`references/` directory. Read the relevant reference file before writing code.

## How to use this skill

**Progressive disclosure — do NOT read everything at once.**
This skill is structured in layers. Only load what you need for the current task:

1. **This file (SKILL.md)** — always loaded. Contains decision routing, core
   principles, pitfalls, and anti-patterns. Sufficient for answering quick
   questions and making architectural decisions.
2. **`references/*.md`** — load on demand. Use the Decision Router below to
   pick the 1–2 files relevant to the user's current task. Do NOT read all 20
   reference files — that wastes context and causes confusion.
3. **`scripts/`** — run only when the user needs code generation, QoS checking,
   or launch validation. These are tools, not reading material.

**Steps:**

1. If `.skill-runs.log` exists in the workspace, read the last few lines to
   understand what was done and what issues occurred in previous sessions.
2. Identify what the user is building (see Decision Router below).
3. Read **only** the matching `references/*.md` file(s) for detailed guidance.
4. Check the **AI pitfalls** table before generating any code.
5. Apply the Core Engineering Principles in every artifact you produce.
6. When multiple domains intersect (e.g. Nav2 + ros2_control), read both files
   but favor safety > determinism > simplicity when recommendations conflict.

**Execution log:** The Stop hook automatically appends a session summary to
`.skill-runs.log` in the workspace. This lets you see what was validated last
time and what issues were found — check it to avoid repeating past mistakes.

## Decision router

| User is doing...                                  | Read                              |
|---------------------------------------------------|-----------------------------------|
| Creating a workspace, package, or build config    | `references/workspace-build.md`   |
| Writing nodes, executors, callback groups         | `references/nodes-executors.md`   |
| Topics, services, actions, custom interfaces, QoS | `references/communication.md`     |
| Lifecycle nodes, component loading, composition   | `references/lifecycle-components.md` |
| Launch files, conditional logic, event handlers   | `references/launch-system.md`     |
| tf2, URDF, xacro, robot_state_publisher           | `references/tf2-urdf.md`         |
| ros2_control, hardware interfaces, controllers    | `references/hardware-interface.md` |
| Real-time constraints, PREEMPT_RT, memory, jitter | `references/realtime.md`         |
| Nav2, SLAM, costmaps, behavior trees              | `references/navigation.md`       |
| MoveIt 2, planning scene, grasp pipelines         | `references/manipulation.md`     |
| Camera, LiDAR, PCL, cv_bridge, depth processing   | `references/perception.md`       |
| Unit tests, integration tests, launch_testing, CI | `references/testing.md`          |
| ros2 doctor, tracing, profiling, rosbag2, CLI cheat sheet | `references/debugging.md` |
| Docker, cross-compile, fleet deployment, OTA      | `references/deployment.md`       |
| Gazebo, Isaac Sim, sim-to-real, use_sim_time      | `references/simulation.md`       |
| SROS2, DDS security, certificates, supply chain   | `references/security.md`         |
| micro-ROS, MCU/RTOS, XRCE-DDS, rclc              | `references/micro-ros.md`        |
| Multi-robot fleet, Open-RMF, DDS discovery scale  | `references/multi-robot.md`      |
| Message types, units, covariance, frame conventions | `references/message-types.md`    |
| ROS 1 migration, ros1_bridge, hybrid operation    | `references/migration-ros1.md`   |

**Cross-cutting concerns:** Security, error handling, and QoS are not isolated to
single reference files — apply them whenever the data path crosses a trust boundary,
a node owns hardware, or communication reliability matters. Use your judgment about
which cross-cutting concerns apply to the user's specific situation.

## Core engineering principles

These apply to every ROS 2 artifact you produce, regardless of domain.

### 1. Distro awareness

> **Staleness warning:** The table below was last verified on **2026-03-30**.
> If the current date is more than 6 months past that, re-verify EOL dates and
> feature support against https://docs.ros.org/en/rolling/Releases.html before
> relying on this table. When you update it, change both `LAST_UPDATED` and
> `NEXT_REVIEW` comments above.

Always ask which ROS 2 distribution the user targets. Key differences:

| Feature                   | Foxy (**EOL**)       | Humble (LTS)       | Jazzy (LTS)        | Kilted (non-LTS)   | Rolling            |
|---------------------------|----------------------|--------------------|--------------------|--------------------|--------------------|
| EOL                       | Jun 2023 (**ended**) | May 2027           | May 2029           | Nov 2025           | Rolling            |
| Ubuntu                    | 20.04               | 22.04              | 24.04              | 24.04              | Latest             |
| Default DDS               | Fast DDS             | Fast DDS           | Fast DDS           | Fast DDS           | Fast DDS           |
| Zenoh support             | —                    | —                  | —                  | Tier 1             | Tier 1             |
| Type description support  | No                   | No                 | Yes                | Yes                | Yes                |
| Service introspection     | No                   | No                 | Yes                | Yes                | Yes                |
| EventsExecutor            | No                   | No                 | Experimental       | Stable (+ rclpy)   | Stable (+ rclpy)   |
| Default bag format        | sqlite3              | sqlite3            | MCAP               | MCAP               | MCAP               |
| ros2_control interface    | N/A (separate)       | 2.x                | 4.x                | 4.x                | Latest             |
| CMake recommendation      | ament_target_deps    | ament_target_deps  | either             | target_link_libs   | target_link_libs   |

When the user does not specify, default to the latest LTS (Jazzy).
Pin the exact distro in Dockerfile, CI, and documentation so builds are reproducible.

### 2. C++ vs Python decision

Choose the language based on the node's role, not personal preference.

**Use rclcpp (C++) when:**

- The node sits in a control loop running ≥100 Hz
- Deterministic memory allocation matters (real-time path)
- The node is a hardware driver or controller plugin
- Intra-process zero-copy communication is required

**Use rclpy (Python) when:**

- The node is orchestration, monitoring, or parameter management
- Rapid prototyping with frequent iteration
- Heavy use of ML frameworks (PyTorch, TensorFlow) that are Python-native
- The node does not sit in a latency-critical path

**Mixed stacks are normal.** A typical robot has C++ drivers/controllers and Python
orchestration/monitoring. Note: `component_container` (composition) only loads
C++ components via pluginlib. Python nodes run as separate processes, but can
share a launch file and communicate via zero-overhead intra-host DDS.

**Intra-process communication** works for any nodes sharing a process — not only
composable components. Any nodes instantiated in the same process with
`use_intra_process_comms(true)` can use zero-copy transfer.

### 3. Package structure conventions

Every package should follow this layout. Consistency across a workspace reduces
onboarding time and makes CI scripts portable.

```text
my_package/
├── CMakeLists.txt          # or setup.py for pure Python
├── package.xml             # format 3, with  tags
├── config/
│   └── params.yaml         # default parameters
├── launch/
│   └── bringup.launch.py   # Python launch file
├── include/my_package/     # C++ public headers (if library)
├── src/                    # C++ source files
├── my_package/             # Python modules (if ament_python or mixed)
├── test/                   # gtest, pytest, launch_testing
├── urdf/                   # URDF/xacro (if applicable)
├── msg/ srv/ action/       # custom interfaces (dedicated _interfaces package preferred)
└── README.md
```

Separate interface definitions into a `*_interfaces` package so downstream
packages can depend on interfaces without pulling in implementation.

### 4. Parameter discipline

- Declare every parameter with a type, description, range, and default
  in the node constructor — never use undeclared parameters.
- Use `ParameterDescriptor` with `FloatingPointRange` or `IntegerRange`
  for numeric bounds. The parameter server rejects out-of-range values at set time.
- Group related parameters under a namespace prefix:
  `controller.kp`, `controller.ki`, `controller.kd`.
- Load defaults from a `config/params.yaml`; allow launch-time overrides.
- For dynamic reconfiguration, register a `set_parameters_callback` and
  validate new values atomically before accepting.

### 5. Error handling philosophy

- Nodes must not silently swallow errors. Log at the appropriate severity,
  then take a safe action (stop motion, request help, transition to error state).
- Prefer lifecycle node error transitions over ad-hoc boolean flags.
- When calling a service, always handle the "service not available" and
  "future timed out" cases explicitly.
- For hardware drivers, distinguish transient errors (retry with backoff)
  from fatal errors (transition to `FINALIZED` and alert the operator).

### 6. Quality of Service defaults

Start from these profiles and adjust per use case:

| Use case              | Reliability   | Durability       | History | Depth | Deadline    | Lifespan    |
|-----------------------|---------------|------------------|---------|-------|-------------|-------------|
| Sensor stream         | BEST_EFFORT   | VOLATILE         | KEEP_LAST | 5   | —           | —           |
| Command velocity      | RELIABLE      | VOLATILE         | KEEP_LAST | 1   | 100 ms      | 200 ms      |
| Map (latched)         | RELIABLE      | TRANSIENT_LOCAL  | KEEP_LAST | 1   | —           | —           |
| Diagnostics           | RELIABLE      | VOLATILE         | KEEP_LAST | 10  | —           | —           |
| Parameter events      | RELIABLE      | VOLATILE         | KEEP_LAST | 1000| —           | —           |
| Action feedback       | RELIABLE      | VOLATILE         | KEEP_LAST | 1   | —           | —           |
| Safety heartbeat      | RELIABLE      | VOLATILE         | KEEP_LAST | 1   | 500 ms      | 1 s         |

QoS mismatches are the #1 cause of "I published but nobody receives."
Always check compatibility with `ros2 topic info -v` when debugging.

**DEADLINE and LIFESPAN** are critical for safety-critical systems. DEADLINE fires an
event when no message arrives within the specified period (detect stale data). LIFESPAN
discards messages older than the specified duration before delivery (prevent acting on
stale data). See `references/communication.md` section 9 for full API and examples.

### 7. Naming conventions

| Entity      | Convention                  | Example                        |
|-------------|-----------------------------|--------------------------------|
| Package     | `snake_case`                | `arm_controller`               |
| Node        | `snake_case`                | `joint_state_broadcaster`      |
| Topic       | `/snake_case` with ns       | `/arm/joint_states`            |
| Service     | `/snake_case`               | `/arm/set_mode`                |
| Action      | `/snake_case`               | `/arm/follow_joint_trajectory` |
| Parameter   | `snake_case` with dot ns    | `controller.publish_rate`      |
| Frame       | `snake_case`                | `base_link`, `camera_optical`  |
| Interface   | `PascalCase.msg/srv/action` | `JointState.msg`               |

### 8. Thread safety and callbacks

- A `MutuallyExclusiveCallbackGroup` serializes its callbacks — safe for
  shared state without locks, but limits throughput.
- A `ReentrantCallbackGroup` allows parallel execution — you must protect
  shared state with `std::mutex` (C++) or `threading.Lock` (Python).
- **Calling a service from a callback:** The service client **must** be in a
  separate `MutuallyExclusiveCallbackGroup` from the calling callback. Otherwise
  the executor deadlocks — the callback waits for the response while the executor
  cannot deliver it. Always use `async_send_request` with a response callback;
  never use `spin_until_future_complete` inside an executor callback.
- Never do blocking work (file I/O, long computation, `sleep`) inside a
  timer or subscription callback on the default executor. Offload to a
  dedicated thread or use a `MultiThreadedExecutor` with a reentrant group.
- In rclcpp, prefer `std::shared_ptr` in subscription
  callbacks to avoid unnecessary copies and enable zero-copy intra-process.

### 9. Lifecycle-first design

Default to lifecycle (managed) nodes for anything that owns resources:
hardware drivers, sensor pipelines, planners, controllers.

```text
                 ┌──────────────┐
  create() ──►  │  Unconfigured │
                 └──────┬───────┘
            on_configure │
                 ┌──────▼───────┐
                 │   Inactive    │
                 └──────┬───────┘
            on_activate  │
                 ┌──────▼───────┐
                 │    Active     │
                 └──────┬───────┘
           on_deactivate │
                 ┌──────▼───────┐
                 │   Inactive    │
                 └──────┬───────┘
            on_cleanup   │
                 ┌──────▼───────┐
                 │  Unconfigured │
                 └──────┬───────┘
           on_shutdown   │
                 ┌──────▼───────┐
                 │   Finalized   │
                 └───────────────┘
```

This gives the system manager (launch file, orchestrator, or operator) explicit
control over when resources are allocated, when the node starts processing,
and how it shuts down. It also makes error recovery predictable.

### 10. Build and CI hygiene

- Use `colcon build --cmake-args -DCMAKE_BUILD_TYPE=RelWithDebInfo` for
  development; `Release` for deployment.
- Enable `-Wall -Wextra -Wpedantic` and treat warnings as errors in CI.
- Run `colcon test` with `--event-handlers console_cohesion+` so test
  output groups by package.
- Pin rosdep keys in `rosdep.yaml` for reproducible dependency resolution.
- Cache `/opt/ros/`, `.ccache/`, and `build/`/`install/` in CI to cut build
  times by 60–80%.

## Common anti-patterns

| Anti-pattern | Why it hurts | Fix |
|---|---|---|
| Global variables for node state | Breaks composition, untestable | Store state as class members |
| `spin()` in `main()` for multi-node processes | Starves other nodes | Use `MultiThreadedExecutor` or component composition |
| Hardcoded topic names | Breaks reuse across robots | Use relative names + namespace remapping |
| `KEEP_ALL` history with no bound | Memory grows unbounded on slow subscribers | Use `KEEP_LAST` with explicit depth |
| Using `time.sleep()` / `std::this_thread::sleep_for` | Blocks the executor thread | Use `create_wall_timer` or a dedicated thread |
| Monolithic launch file for everything | Unmanageable past 10 nodes | Compose launch files with `IncludeLaunchDescription` |
| Skipping `package.xml` dependencies | Buil

…

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [dbwls99706](https://github.com/dbwls99706)
- **Source:** [dbwls99706/ros2-engineering-skills](https://github.com/dbwls99706/ros2-engineering-skills)
- **License:** Apache-2.0

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-dbwls99706-ros2-engineering-skills-ros2-engineering-skills
- Seller: https://agentstack.voostack.com/s/dbwls99706
- Browse the marketplace: https://agentstack.voostack.com/browse

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