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 iot-forge/m5stack-skills --skill core2git clone --depth 1 https://github.com/iot-forge/m5stack-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/iot-forge/m5stack-skills/core2)<a href="https://agentmods.dev/skills/iot-forge/m5stack-skills/core2"><img src="https://agentmods.dev/badge/skills/iot-forge/m5stack-skills/core2/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/iot-forge/m5stack-skills/core2"><img src="https://agentmods.dev/badge/skills/iot-forge/m5stack-skills/core2.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00328 | $0.06553 |
| Opus 5.5 | $0.00131 | $0.02621 |
| Sonnet 5.5 | $0.00066 | $0.01311 |
| Haiku 4.5 | $0.00033 | $0.00655 |
Grade A, and why
m5stack-core2 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 11d 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 — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.
M5Stack Core2 family development
Core2 is M5Stack's 2.0" touchscreen ESP32 (classic) Controller family. Every member shares the same core: ESP32-D0WDQ6-V3 (dual-core Xtensa LX6 @ 240MHz), 16MB flash, 8MB PSRAM, an AXP192 power management IC, a 2.0" 320x240 ILI9342C IPS display with FT6336U capacitive touch, a BM8563 RTC, an NS4168 I2S amp + SPM1423 PDM mic, and a 500mAh 3.7V battery charged over a magnetic pogo-pin base. Official docs index: https://docs.m5stack.com/en/core/core2
This skill folds M5Stack's several Core2 hardware revisions into one skill rather than near-duplicate skills per revision — read "Hardware revisions" below before writing code, since the differences (which IMU chip, whether an ATECC608 crypto chip and RGB LED ring are present, physical dimensions) matter for correctness.
Important: this is classic ESP32, not S3/P4
Unlike the other M5Stack Controller skills in this marketplace (Cardputer
Adv, Tab5), Core2 runs on a classic ESP32 (ESP32-D0WDQ6-V3) — Xtensa
LX6, not LX7, no native USB (programming/serial goes through an onboard
USB-UART bridge chip, not a USB-CDC peripheral on the SoC itself), no
ULP-RISC-V coprocessor, and Bluetooth Classic + BLE 4.2 rather than BLE 5.
For chip-level capability questions that aren't about this board's specific
wiring — RMT, LEDC, I2S, ADC/touch, deep sleep and wake sources, the ULP-FSM
coprocessor, PSRAM/flash config, WiFi/BT coexistence — see the esp32
skill (classic ESP32), shipped in the esp32-chips plugin of this same
marketplace. Install it with claude plugin install esp32-chips@m5stack if
it isn't present. Do not assume ESP32-S3 or ESP32-P4 chip-skill content
applies to this board; the classic part differs substantially.
Hardware revisions
M5Stack has shipped several Core2 revisions under two product lines — plain Core2 and Core2 For AWS. The AWS line adds hardware the plain line doesn't have; within each line, "v1.3" denotes a component refresh (IMU and USB-serial bridge chip swapped) rather than a peripheral change.
What ships with it
6 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.
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.
- 11d ago Changed · +2 lines 9ec7b10cbcac
- 1mo ago First seen · 313 lines · 328 tokens per session scan A e96423d63040
m5stack-core2 is a skill published in the GitHub repository iot-forge/m5stack-skills (5 stars, last pushed 12d ago), licensed MIT. It adds 328 tokens to every session and 6,553 once invoked, about $0.0013 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 2026-08-31.
Other skills, from other repositories
sticky-device
Hardware facts, ESP-IDF firmware patterns, ePaper/touch APIs, and Playground publishing rules for the Seeed Studio reTerminal Sticky (ESP32-S3, 3.97" 800x480 e-ink). Use when working on reTerminal Sticky or "Sticky" firmware, apps, pin assignments, display refresh, touch gestures, deep sleep, ESPHome/Home Assistant…
embedded-engineer
(oh-my-embedded) Senior embedded systems engineer. ESP32/STM32, FreeRTOS, RF design, power management, peripheral interfaces. Use for any embedded/firmware/electronics/hardware question.
firmware-debugger
(oh-my-embedded) Firmware debugging via GDB and serial monitor. Breakpoints, memory inspection, stack traces, JTAG/SWD. Requires debug probe.
component-sourcer
(oh-my-embedded) Electronic component search, BOM optimization, alternative parts finder. Searches JLCPCB/LCSC, Nexar/Octopart catalogs.
embedded-review
(oh-my-embedded) Embedded firmware code review. Memory safety, ISR correctness, RTOS pitfalls, peripheral interfaces, C/C++ UB traps. Severity P0-P3.
pcb-designer
(oh-my-embedded) PCB design with KiCad. Schematic capture, component placement, trace routing, DRC, Gerber export, JLCPCB BOM. Requires KiCad installed.