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Guide · Agent skill

How to use the Embedded Systems Firmware Helper agent skill

Updated · written with AI from the project's own documentation and checked against our catalogue data

The embedded-systems skill gives an AI agent specialist guidance for writing firmware for microcontrollers, the small chips inside sensors, gadgets and motor controllers. This guide explains what an agent skill is, how to install this one, how to trigger it with natural requests, and what to check before you trust the output. By the end you will be able to load the skill and ask an agent for interrupt handlers, FreeRTOS tasks, peripheral setup or power and timing reviews.

Embedded Systems Firmware HelperJeffallan/claude-skills · MIT

Quick start

  1. 1Download the ZIP. Download the embedded-systems skill ZIP from this page.
  2. 2Unzip into a skills folder. Unzip it into ~/.claude/skills/ for personal use or into .claude/skills/ in your project.
  3. 3Or upload in the Claude apps. In the Claude apps, open Settings, go to Capabilities, and upload the skill under Skills.
  4. 4Gather your toolchain and hardware. Install a C toolchain such as gcc-arm-none-eabi and have your target board ready.
  5. 5Ask with a specific request. Describe the chip, the peripheral or RTOS task, and your memory, timing or power limits.
  6. 6Build, flash and measure. Compile with -Wall -Werror, check stack usage and timing on hardware, and iterate.

What is an agent skill and what does this one make the agent do?

An agent skill is a folder of instructions and reference files that an AI agent loads when a task matches its description. This skill is written for embedded firmware work on STM32 and ESP32 boards, bare-metal code, FreeRTOS applications, and power optimization.

Once installed, the agent follows an embedded-engineering workflow. It analyzes constraints first (MCU specs, memory limits, timing requirements, power budget), then designs the task structure, interrupts and peripherals, then implements drivers and application code. It is asked to compile with -Wall -Werror, run static analysis such as cppcheck, and verify timing with a logic analyzer or oscilloscope.

  • Writes interrupt handlers that stay short and defer work to tasks or the main loop
  • Drafts FreeRTOS tasks, queues and synchronization code
  • Sets up peripherals such as GPIO, timers, I2C, SPI, UART and CAN
  • Suggests checks: compiler warnings, stack usage with uxTaskGetStackHighWaterMark(), ISR latency and missed deadlines
  • Loads detailed reference notes on RTOS patterns, microcontroller programming, power, communication protocols and memory when the request calls for them

Install the skill: download the ZIP and unzip it

Download the skill ZIP from this page. Then choose one of two locations. For a personal install available to all your projects, unzip it into ~/.claude/skills/. For a single project, unzip it into that project's .claude/skills/ folder.

If you use the Claude apps instead, open Settings, go to Capabilities, and upload the skill under Skills.

  • Personal install: ~/.claude/skills/
  • Project install: .claude/skills/ inside your project folder
  • Claude apps: Settings → Capabilities → Skills, then upload

Check the requirements before you start

The skill writes code and guidance but does not build or flash anything itself. You need a C toolchain for ARM Cortex-M or ESP32 builds, for example gcc-arm-none-eabi, to compile and test the output. If you use the provided templates, you also need FreeRTOS and STM32 HAL headers.

For the timing verification steps, a logic analyzer or oscilloscope and your target hardware are recommended.

  • C toolchain for ARM Cortex-M or ESP32 (for example gcc-arm-none-eabi)
  • FreeRTOS and STM32 HAL headers if you use the templates
  • Target board and a logic analyzer or oscilloscope (recommended for timing checks)

Trigger the skill with natural requests

You do not need a special command. Describe the firmware task in plain language and mention the chip or concept, since the skill is triggered by terms such as STM32, ESP32, FreeRTOS, bare-metal, interrupt, DMA, power optimization and real-time. Include your constraints when you have them, such as memory limits, the sensor you read or the battery life you need.

Good requests name the target and the goal, for example asking for a UART receive interrupt on an STM32 that hands bytes to a task, or asking for a review of a sleep-mode design for battery life.

  • "Write a UART receive interrupt handler for STM32 that passes bytes to a FreeRTOS task."
  • "Set up TIM2 on an STM32 to toggle an LED once per second using a timer interrupt."
  • "Review this ESP32 firmware for power use and suggest sleep modes."
  • "Help me debug why my DMA transfer on STM32 misses its timing deadline."

Read the output and verify it on hardware

The skill's output is code and engineering guidance that you must build, flash and test. Its output format includes hardware initialization, driver code, application code, a resource usage summary (flash, RAM, power estimate) and a short explanation of timing decisions. Ask for that summary when you want to compare options.

Treat the code as a draft. The skill's sample code targets particular STM32 and FreeRTOS APIs, and it may need changes for your board, clock tree or HAL version. Check register bit-field usage against the datasheet.

  • Compile with -Wall -Werror and fix every warning
  • Run static analysis such as cppcheck
  • Measure stack headroom and ISR latency on target
  • Confirm no missed deadlines under worst-case load
gcc -Wall -Werror

Safety notes: scripts, network and certification

This skill does not run scripts and does not use the network, according to its listing. Its code samples are not verified against real hardware, datasheets or certification standards.

Do not use the output for safety-critical products such as medical, automotive or aerospace devices without expert review. The skill itself asks the agent to avoid blocking operations in ISRs, to use volatile for shared variables and hardware registers, and to add a watchdog timer, but you remain responsible for checking these on your hardware.

  • No scripts are run by this skill
  • No network use
  • Safety-critical designs need expert review and certification work

What people use it for

  • Drafting an interrupt-driven UART receiver for an STM32 board
  • Creating a FreeRTOS sensor task that samples on a fixed period and sends readings through a queue
  • Setting up a timer interrupt to blink an LED as a first bare-metal exercise
  • Reviewing existing firmware for sleep modes, memory use and power consumption

Frequently asked questions

How do I install the embedded-systems agent skill?

Download the ZIP from this page and unzip it into ~/.claude/skills/ for a personal install, or into a project's .claude/skills/ folder. In the Claude apps, you can instead upload it under Settings, then Capabilities, then Skills.

What do I need to use this skill?

You need a C toolchain for ARM Cortex-M or ESP32 builds, such as gcc-arm-none-eabi, to compile the output. FreeRTOS and STM32 HAL headers are needed if you use the templates, and a logic analyzer or oscilloscope is recommended for timing checks.

Is the embedded-systems skill free to use?

The skill is published under the MIT licence, as stated on this page. Check the licence file in the download for the full terms.

Does this skill run code or access the internet?

According to its listing, the skill does not run scripts and does not use the network. The agent produces code and guidance that you build and test yourself.

Can I use this skill for a medical or automotive product?

Not without expert review. The generated code is unverified against real hardware, datasheets or certification standards, so safety-critical products need that work done separately.

What is the difference between this skill and asking a general AI chat for firmware help?

This skill adds an embedded workflow and reference notes on RTOS patterns, power, communication protocols and memory, loaded when relevant. It also asks the agent to check memory, timing and power limits first and to suggest compiler, stack and timing checks.

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Our verdict

Use this skill if you write firmware for STM32 or ESP32 boards, are learning bare-metal or FreeRTOS, or need a second look at power or memory use, and you are comfortable building and measuring the code yourself. Pick something else if you need a finished product, are working on safety-critical systems without expert review, or need guaranteed correctness on a chip the examples do not cover.

Download the skill