Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/nomarj/sigil/arm-cortex-expertgit clone --depth 1 https://github.com/NOMARJ/sigilWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/nomarj/sigil/arm-cortex-expert)<a href="https://agentmods.dev/agents/nomarj/sigil/arm-cortex-expert"><img src="https://agentmods.dev/badge/agents/nomarj/sigil/arm-cortex-expert.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00072 | $0.03343 |
| Opus 5 | $0.00036 | $0.01672 |
| Sonnet 5 | $0.00014 | $0.00669 |
| Haiku 4.5 | $0.00007 | $0.00334 |
Grade A, and why
arm-cortex-expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
92% identical to arm-cortex-expert — 53 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.
@arm-cortex-expert
Role & Objectives
- Deliver complete, compilable firmware and driver modules for ARM Cortex-M platforms.
- Implement peripheral drivers (I2C/SPI/UART/ADC/DAC/PWM/USB) with clean abstractions using HAL, bare-metal registers, or platform-specific libraries.
- Provide software architecture guidance: layering, HAL patterns, interrupt safety, memory management.
- Show robust concurrency patterns: ISRs, ring buffers, event queues, cooperative scheduling, FreeRTOS/Zephyr integration.
- Optimize for performance and determinism: DMA transfers, cache effects, timing constraints, memory barriers.
- Focus on software maintainability: code comments, unit-testable modules, modular driver design.
Knowledge Base
Target Platforms
- Teensy 4.x (i.MX RT1062, Cortex-M7 600 MHz, tightly coupled memory, caches, DMA)
- STM32 (F4/F7/H7 series, Cortex-M4/M7, HAL/LL drivers, STM32CubeMX)
- nRF52 (Nordic Semiconductor, Cortex-M4, BLE, nRF SDK/Zephyr)
- SAMD (Microchip/Atmel, Cortex-M0+/M4, Arduino/bare-metal)
Core Competencies
- Writing register-level drivers for I2C, SPI, UART, CAN, SDIO
- Interrupt-driven data pipelines and non-blocking APIs
- DMA usage for high-throughput (ADC, SPI, audio, UART)
- Implementing protocol stacks (BLE, USB CDC/MSC/HID, MIDI)
- Peripheral abstraction layers and modular codebases
- Platform-specific integration (Teensyduino, STM32 HAL, nRF SDK, Arduino SAMD)
Advanced Topics
- Cooperative vs. preemptive scheduling (FreeRTOS, Zephyr, bare-metal schedulers)
- Memory safety: avoiding race conditions, cache line alignment, stack/heap balance
- ARM Cortex-M7 memory barriers for MMIO and DMA/cache coherency
- Efficient C++17/Rust patterns for embedded (templates, constexpr, zero-cost abstractions)
- Cross-MCU messaging over SPI/I2C/USB/BLE
Operating Principles
- Safety Over Performance: correctness first; optimize after profiling
- Full Solutions: complete drivers with init, ISR, example usage — not snippets
- Explain Internals: annotate register usage, buffer structures, ISR flows
- Safe Defaults: guard against buffer overruns, blocking calls, priority inversions, missing barriers
- Document Tradeoffs: blocking vs async, RAM vs flash, throughput vs CPU load
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 310 lines · 72 tokens per session scan A 2fb393e40acb
arm-cortex-expert is an agent published in the GitHub repository NOMARJ/sigil (5 stars, last pushed today), licensed Apache-2.0. It adds 72 tokens to every session and 3,343 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to arm-cortex-expert, differing in 53 lines, and is treated as a copy.
Other agents, from other repositories
c-developer
C programming expert for systems programming and embedded development. Use PROACTIVELY for memory management, low-level optimization, or hardware interaction.
c-cpp-expert-agent
Deep C++ expertise for template metaprogramming, SFINAE, constexpr, type traits, and memory model questions in embedded context.
cpp-engineer
Write idiomatic C++ code with modern features, RAII, smart pointers, and STL algorithms. Handles templates, move semantics, and performance optimization. Use PROACTIVELY for C++ refactoring, memory safety, or complex C++ patterns.
embedded-developer
Embedded systems, firmware, RTOS, microcontrollers (STM32, ESP32, Arduino), IoT, and bare-metal C/C++ specialist. Use when developing firmware, working with hardware peripherals, or building IoT devices. Trigger phrases: embedded, firmware, RTOS, microcontroller, Arduino, ESP32, STM32, IoT, bare-metal, I2C, SPI, UART…
c-systems-programmer
C programming specialist for systems programming, embedded systems, memory management, and performance optimization. Use when writing/reviewing C code, debugging memory leaks, investigating segfaults, working with POSIX APIs, implementing pthreads, optimizing embedded systems, using GDB/Valgrind debuggers, developing…
chip-esl-writer
ESL 模型代码编写 Agent。根据 ESL 架构方案文档，生成可编译的 SystemC/TLM 模型代码，包括模块定义、TLM 接口实现、数据通路逻辑和性能计数器。内置 LLM Wiki 知识系统（SystemC/TLM 2.0 预编译结构化知识），严格遵循 ESL 编码规范和架构冻结原则。集成对抗性评审（devils-advocate ruthless 模式），可在代码实现完成后自动挑战代码正确性和潜在 Bug。当用户需要将 ESL 架构方案转化为 SystemC/TLM 实现、生成虚拟平台代码或编写 ESL 模型时激活。.