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 skills add alexex1993/mcu-skills --skill atmega32u4-beetlegit clone --depth 1 https://github.com/alexex1993/mcu-skillsWrote 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/skills/alexex1993/mcu-skills/atmega32u4-beetle)<a href="https://agentmods.dev/skills/alexex1993/mcu-skills/atmega32u4-beetle"><img src="https://agentmods.dev/badge/skills/alexex1993/mcu-skills/atmega32u4-beetle/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/alexex1993/mcu-skills/atmega32u4-beetle"><img src="https://agentmods.dev/badge/skills/alexex1993/mcu-skills/atmega32u4-beetle.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 302 Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.
- medium Rogue Agent · line 148 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 5.1 | $0.00000 | $0.05572 |
| Opus 5 | $0.00000 | $0.02786 |
| Sonnet 5 | $0.00000 | $0.01114 |
| Haiku 4.5 | $0.00000 | $0.00557 |
Grade A, and why
atmega32u4-beetle 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 305 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Beetle — Mini Arduino Leonardo (ATmega32U4)
Board-specific firmware knowledge. The Beetle is an ATmega32U4 with native USB and ten pads, and almost every trap on it comes from one of those two facts: USB means the programming interface is the sketch you are about to replace, and ten pads means most of the Leonardo pin numbering the compiler accepts goes nowhere on this board.
reference/board-hardware.md— the complete board reference: pad inventory and full pin map, the sixteen I/O lines that are not brought out, power tree, clock and PLL, memory map, fuses and the Caterina bootloader plus a development guide (Part II: §8 toolchain, §9 USB and the two serial ports, §10 peripheral cookbook, §11 gotchas, §12 flashing and recovery, §13 symptom → cause → fix table).reference/recipes.md— copy-paste code:platformio.ini,board.h, non-blocking timing, USB-CDC that never blocks,Serial1on the TX/RX pads, I2C and SPI, the ADC channel map, external and pin-change interrupts, PWM and the timer map, Servo vstone(), HID keyboard with its safety guards, EEPROM, power-down sleep with USB.template/— a project that builds clean, in three variants, plus a scaffold script. Seetemplate/README.md.
Orientation
| MCU | ATmega32U4, 8-bit AVR @ 16 MHz (crystal), 44-pin QFN. 26 I/O lines on the chip, 10 on the pads |
| Memory | 32 KB flash, 28,672 B usable (Caterina bootloader keeps 4 KB), 2,560 B SRAM, 1 KB EEPROM, + 832 B of USB DPRAM that is not part of SRAM |
| Board | DFRobot: 20 × 22 × 3.8 mm; the larger clone this skill was written against: 21 × 28 mm. Castellated pads, micro-USB. No reset button, no regulator, no VIN, no 3V3 |
| Exposed pads | RX(D0) TX(D1) SDA(D2) SCL(D3) 9 10 11 A0 A1 A2 + + (VCC) and - (GND) — DFRobot's own pad↔pin table |
| LED | D13 = PC7, on = HIGH, no pad. DFRobot advertise a "magic light blue soft BLINK indicator" — the blue LED is D13 |
| PWM | 4 pads: D3, D11 on Timer0 (the millis() timer, ~977 Hz) · D9, D10 on Timer1 (the Servo timer, ~490 Hz) |
| ADC | 5 × 10-bit: A0 (PF7/ADC7), A1 (PF6/ADC6), A2 (PF5/ADC5), and D9 = A9 (ADC12), D10 = A10 (ADC13) |
| Interrupts | 4 external: D3→INT0, D2→INT1, D0→INT2, D1→INT3 · pin-change on D9/D10/D11 (PCINT5/6/7) |
| USB | Native, on-chip. Serial = USB CDC (no baud rate). HID keyboard/mouse/joystick supported |
| UART | Serial1 on TX/RX (D1/D0) — a genuinely free hardware UART, unlike on an Uno/Nano |
| I2C / SPI | SDA=D2, SCL=D3 (SCL doubles as a PWM pad) · SPI on unlabelled test pads: MISO=D14/PB3, SCK=D15/PB1, MOSI=D16/PB2, SS=D17/PB0 |
| Power | 4.5–5 V reliable · 3–4.5 V "may work, not guaranteed" · 6 V destroys it (DFRobot). + is unregulated. Motor/relay loads need ≥ 10 µF and their own supply feed |
| Debug | No SWD/JTAG in practice — the JTAG pins are A0–A3 and the Arduino fuse set disables them. 6-dot ICSP pad array on the back = SPI + RESET |
| Toolchain | PlatformIO 6.1 + atmelavr 5.3.0 + Arduino AVR core, board = leonardo (there is no beetle board in PlatformIO) |
What ships with it
11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- assets/IMAGE.md 448 B
- reference/board-hardware.md 33 KB
- reference/recipes.md 18 KB
- template/.gitignore 13 B
- template/include/board.h 6.2 KB
- template/platformio.ini 1.5 KB
- template/README.md 4.5 KB
- template/src/main.cpp 4.0 KB
- template/variants/hid/main.cpp 3.0 KB
- template/variants/minimal/main.cpp 1019 B
- template/variants/new-project.sh 1.7 KB runs code
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.
- 12d ago First seen · 305 lines · 0 tokens per session scan A 446735fcad77
atmega32u4-beetle is a skill published in the GitHub repository alexex1993/mcu-skills (17 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 5,572 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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