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 esp8266-nodemcu-30pingit 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/esp8266-nodemcu-30pin)<a href="https://agentmods.dev/skills/alexex1993/mcu-skills/esp8266-nodemcu-30pin"><img src="https://agentmods.dev/badge/skills/alexex1993/mcu-skills/esp8266-nodemcu-30pin/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/esp8266-nodemcu-30pin"><img src="https://agentmods.dev/badge/skills/alexex1993/mcu-skills/esp8266-nodemcu-30pin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
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 →
- medium analysis-evasion · line 1 Suspicious Unicode normalization or mixed-script contentFix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
- medium Rogue Agent · line 116 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 | $0.00250 | $0.05459 |
| Opus 5.5 | $0.00100 | $0.02184 |
| Sonnet 5.5 | $0.00050 | $0.01092 |
| Haiku 4.5 | $0.00025 | $0.00546 |
Grade A, and why
esp8266-nodemcu-30pin 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 6d 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 — 303 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NodeMCU ESP8266 devkit — 30-pin
The board that made the ESP8266 usable: an Ai-Thinker ESP-12E/F module, a USB-UART bridge, an LDO, two buttons, 15 pins a side. Everything hard about it is a pin with a second job, a peripheral that is software rather than silicon, or a number that means something different than it looks like.
Read reference/board-hardware.md before choosing pins. Most ESP8266 tutorials are
written for core 2.x and for a different board; several of their defaults are now wrong.
reference/board-hardware.md— the board: full header map with D-number ↔ GPIO translation, the strapping resistors and their values, the two LEDs, the A0 divider, the auto-program circuit and its truth table, the power tree — plus a development guide (§9 toolchain and flash layouts, §10 flashing and recovery, §11 peripheral cookbook, §12 symptom → cause → fix table).reference/esp8266-soc.md— the silicon: the 17 GPIOs and which six are the flash bus, memory map and why a sketch cannot exceed ~1 MB, clocks, the ADC's two mutually exclusive modes, UART/SPI/HSPI/I2S pin tables, PWM as a timer service, sleep modes and their real currents.reference/recipes.md— code that compiles:platformio.inivariants, digital and analog IO, software I2C and its scanner, HSPI, LittleFS, Wi-Fi station with reconnect, ArduinoOTA, deep sleep with RTC memory, Ticker, WS2812 over I2S, and the watchdog and exception-decoder recipes.template/— a project that builds clean and was run on hardware, in two variants, plus a scaffold script. Seetemplate/README.md.
Confirm the board first
All 30-pin NodeMCU boards share the module, the pin map and every rule below. Two things differ, and both bite:
| DevKit V1.0 / Amica ("V2") | LoLin NodeMCU V3 | |
|---|---|---|
| Bridge | CP2102 (Silicon Labs VCP driver) | CH340G (WCH driver) |
| Size | 48 × 26 mm — fits a breadboard with a row free | 58 × 31 mm — covers both rails, needs two breadboards |
| Two pads next to A0 | RSV, RSV — not connected |
VU (USB 5 V, pre-LDO) and GND |
| Port name | cu.SLAB_USBtoUART / cu.usbserial-0001 |
cu.usbserial-*, VID 0x1A86 PID 0x7523 |
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 464 B
- reference/board-hardware.md 20 KB
- reference/esp8266-soc.md 11 KB
- reference/recipes.md 14 KB
- template/.gitignore 13 B
- template/include/board.h 5.5 KB
- template/platformio.ini 2.3 KB
- template/README.md 4.1 KB
- template/src/main.cpp 6.5 KB
- template/variants/minimal/main.cpp 1.4 KB
- template/variants/new-project.sh 1.4 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.
- 6d ago Changed · +2 lines · +250 tokens per session 05ce95ae2e35
- 2mo ago First seen · 301 lines · 0 tokens per session scan A 2f19796c9bc2
esp8266-nodemcu-30pin is a skill published in the GitHub repository alexex1993/mcu-skills (25 stars, last pushed 7d ago), licensed MIT. It adds 250 tokens to every session and 5,459 once invoked, about $0.0010 per session on Opus 5.5. 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.
esp8266-nodemcu-30pin compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| esp8266-nodemcu-30pinalexex1993/mcu-skills | Skill | 25 | 7d ago | MIT | A | 250 | Claude Code, Codex |
| holoscan-install-wheelNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 34 | Claude Code, Codex |
| doca-argpNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 277 | Claude Code, Codex |
| holoscan-module-lifecycleNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 47 | Claude Code, Codex |
| mspm0-skillIbook000/mspm0-skill | Skill | 13 | 1mo ago | MIT | A | 76 | Claude Code, Codex |
| keymap-aijohncattrall/keymap-ai | Skill | 24 | 1mo ago | MIT | A | 146 | Claude Code, Codex |
| arduino-code-generatorwedsamuel1230/arduino-skills | Skill | 24 | 2mo ago | MIT | A | 86 | Claude Code |