What is esp32-flash-monitor?

A workflow guide for ESP32-family firmware projects using PlatformIO, a tool for building and uploading embedded code. It covers building, uploading, monitoring, and diagnosing the device.

Working with ESP32, ESP8266, ESP32-S3, and ESP32-C3 projects: build the code, upload it after approval, monitor logs, and retry fixes.

It keeps the common build-to-device workflow organised and helps identify crashes or failed startup from serial output.

How jl-codes/platformio-mcp configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to jl-codes/platformio-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/jl-codes/platformio-mcp/main/.skills/esp32-flash-monitor/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/jl-codes/platformio-mcp

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jl-codes/platformio-mcp/esp32-flash-monitor/github.svg)](https://agentmods.dev/skills/jl-codes/platformio-mcp/esp32-flash-monitor)

Your own site

<a href="https://agentmods.dev/skills/jl-codes/platformio-mcp/esp32-flash-monitor"><img src="https://agentmods.dev/badge/skills/jl-codes/platformio-mcp/esp32-flash-monitor/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jl-codes/platformio-mcp/esp32-flash-monitor"><img src="https://agentmods.dev/badge/skills/jl-codes/platformio-mcp/esp32-flash-monitor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 546 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00055	$0.00546
Opus 5.5	$0.00022	$0.00218
Sonnet 5.5	$0.00011	$0.00109
Haiku 4.5	$0.00006	$0.00055

Measured 25d ago against content hash 324dc94f8521, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

esp32-flash-monitor 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 25d 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.

.skills/esp32-flash-monitor/SKILL.md · 47 lines

What it actually says

ESP32 Flash and Monitor

Reading results: a non-zero exit means look at BOTH streams. An operation that ran but failed (a build with errors) puts success: false on stdout; one that could not run (bad arguments, policy, a busy port) puts errorType on stderr with stdout empty. Capture both (--json 2>&1). See the pio-manager skill for the full contract.

Purpose

Use this skill for the common ESP32 workflow: build, flash, monitor, diagnose, patch, and retry.

Safety Rules

Ask before flashing.
Do not erase flash unless explicitly requested.
Stop active serial monitors before upload if the port is busy.
Save build and serial logs.

Workflow

Inspect platformio.ini, run pio-agent devices, and call pio-agent target-resolve for one explicit ESP32 environment.
Confirm the resolved board, stable device fingerprint, and short-lived binding; stop on ambiguity.
Run pio-agent agent-safe-pin-audit --project-dir <dir> --board <id> for ESP32 strapping, input-only, and flash/SPI pin risks.
Build with pio-agent agent-build-diagnose --project-dir <dir> --environment <env> and preserve its task/log references.
Summarize build result, including RAM and flash usage if available.
Ask user approval before flashing.
Call pio-agent agent-flash-monitor-verify --project-dir <dir> --environment <env> --port <p> with the approved target binding and bounded --expect-all/--reject-patterns markers.
Allow --start-monitor on the flash to reattach the monitor after USB re-enumeration only when the device fingerprint still matches.
Use pio-agent logs capture or pio-agent monitor-health for additional bounded evidence.
Diagnose boot loops, watchdogs, brownouts, panic output, or missing markers and suggest the smallest next change.

Common Board IDs

esp32dev
esp32-s3-devkitc-1
esp32-c3-devkitm-1
nodemcu-32s
lolin_s2_mini

Changes

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.

25d ago Changed · +6 lines 324dc94f8521
1mo ago Changed · +55 tokens per session 7928b931443d
1mo ago First seen · 41 lines · 0 tokens per session scan A a86d2072d0ab

Subscribe to this mod's changes

esp32-flash-monitor is a skill published in the GitHub repository jl-codes/platformio-mcp (54 stars, last pushed 16d ago), licensed MIT. It adds 55 tokens to every session and 546 once invoked, about $0.0002 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.

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platformio-mcp: Skill for Claude Code