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Agent skill

Flash

by rvdbreemen in rvdbreemen/OTGW-firmware

Build firmware + filesystem and flash to ESP via USB. An agent skill from rvdbreemen/OTGW-firmware.

GPL-3.0Auto-check passedDevelopment

Install Flash

skills CLI
$ npx skills add rvdbreemen/OTGW-firmware --skill flash -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install rvdbreemen/OTGW-firmware flash --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/rvdbreemen/OTGW-firmware.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/flash .claude/skills/flash && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
flash
GitHub stars
207
Token cost
~226 tokens
SKILL.md length
82 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
GPL-3.0

At a glance

Build firmware + filesystem and flash to ESP via USB. An agent skill from rvdbreemen/OTGW-firmware.

  • Development work in your project
  • SKILL.md covers Steps and After flashing
  • Calls python

What it does

Flash is an agent skill from rvdbreemen/OTGW-firmware. Build firmware + filesystem and flash to ESP via USB. Auto-detects serial port. No user input needed.

Its SKILL.md is about 230 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. It works with Home Assistant. The repository describes itself as: A ESP8266 devkit firmware for the Nodoshop version of the Opentherm Gateway (OTGW). The licence is GPL-3.0.

When your agent uses it

  • Development work in your project

Example prompts

  • “/flash”

Requirements

  • Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 5e66c3b. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Flash loads about 226 tokens when it runs. Until then it costs about 27 tokens; SKILL.md has 82 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~27
When it runs · the whole SKILL.md, loaded when a task matches
~226

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from rvdbreemen/OTGW-firmware at commit 5e66c3b, republished under its GPL-3.0 licence (© rvdbreemen). 82 words, ~226 tokens.

Download SKILL.mdSave it as .claude/skills/flash/SKILL.md (or your agent's skills folder).
name
flash
description
Build firmware + filesystem and flash to ESP via USB. Auto-detects serial port. No user input needed.
disable-model-invocation
true

/flash - Build and flash OTGW-firmware

Build firmware and filesystem, then flash both to the connected ESP via USB. Fully automated, no user interaction required.

Steps

Run these commands sequentially. Stop and report if any step fails.

bash
cd D:\Users\Robert\Documents\GitHub\RvdB\OTGW-firmware
python build.py
python flash_esp.py --build --no-interactive

The build.py without flags builds both firmware AND filesystem. The flash_esp.py --build --no-interactive flashes both to the ESP without prompts, auto-detecting the serial port.

After flashing

Report:

  • Build result (firmware size, filesystem size)
  • Flash result (port used, success/failure)
  • The firmware version that was flashed (from version.h)

© rvdbreemen, GPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/flash of rvdbreemen/OTGW-firmware.

Open the folder on GitHubat commit 5e66c3b

Compare with similar skills

Flash next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Flash compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Flash this skillrvdbreemen/OTGW-firmware207—~226Automated safety check: PassGPL-3.0
Ha Android Concurrencyhome-assistant/android4k—~1kAutomated safety check: PassApache-2.0
Releasekellerza/sunsynk339—~920Automated safety check: PassApache-2.0
Netdaemon Nuget Upgradenet-daemon/netdaemon312—~1.4kAutomated safety check: PassMIT
Cca Assistanthvorragend/ha-blueprints170—~4.7kAutomated safety check: PassCustom licence
Add Presence Personjohnkoht/hassio-config179—~1.3kAutomated safety check: PassNone

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Works with

Categories

Questions about Flash

What does Flash do?

Build firmware + filesystem and flash to ESP via USB. An agent skill from rvdbreemen/OTGW-firmware. Flash is an agent skill from rvdbreemen/OTGW-firmware. Build firmware + filesystem and flash to ESP via USB.

When should I use Flash?

Flash fits situations like: development work in your project.

How do I install Flash in Claude Code?

Run `npx skills add rvdbreemen/OTGW-firmware --skill flash -a claude-code`. Or copy the skill folder (.claude/skills/flash in rvdbreemen/OTGW-firmware) into .claude/skills/flash in your project. Claude Code loads it when a task matches its description.

How do I install Flash in Codex?

Run `npx skills add rvdbreemen/OTGW-firmware --skill flash -a codex`. Or copy the skill folder (.claude/skills/flash in rvdbreemen/OTGW-firmware) into .agents/skills/flash in your project. Codex loads it when a task matches its description.

Can I use Flash in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add rvdbreemen/OTGW-firmware --skill flash -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/flash, .gemini/skills/flash, .github/skills/flash and .opencode/skills/flash in your project.

What does Flash need to run?

Going by SKILL.md and its folder, Flash needs the command-line tools its instructions call (python). Our summary lists: Python 3.

Does Flash access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Flash safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Flash use?

Flash is published under the GPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Flash use?

About 226 tokens (SKILL.md is roughly 904 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Flash?

Skills that share tags, products or a category with Flash: Ha Android Concurrency (home-assistant/android, 4k stars), Release (kellerza/sunsynk, 339 stars), Netdaemon Nuget Upgrade (net-daemon/netdaemon, 312 stars) and Cca Assistant (hvorragend/ha-blueprints, 170 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flash?

rvdbreemen (a GitHub user) maintains it in rvdbreemen/OTGW-firmware, which has 207 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 6, 2026.

Source: rvdbreemen/OTGW-firmware on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.