Agent skill

Capture Banners

Re-render Scalex banner and OG image PNGs from their HTML source files using Chrome DevTools MCP.

MITAuto-check passedTesting & QA

Install Capture Banners

skills CLI

$ npx skills add nguyenyou/scalex --skill capture-banners -a claude-code

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

GitHub CLI

$ gh skill install nguyenyou/scalex capture-banners --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/nguyenyou/scalex.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/capture-banners .claude/skills/capture-banners && 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/

Paste into Claude Code

Install the "capture-banners" agent skill from https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners into .claude/skills/capture-banners/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capture-banners", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nguyenyou/scalex --skill capture-banners -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nguyenyou/scalex capture-banners --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nguyenyou/scalex.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/capture-banners .agents/skills/capture-banners && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "capture-banners" agent skill from https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners into .agents/skills/capture-banners/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capture-banners", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nguyenyou/scalex --skill capture-banners -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nguyenyou/scalex capture-banners --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nguyenyou/scalex.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/capture-banners .cursor/skills/capture-banners && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "capture-banners" agent skill from https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners into .cursor/skills/capture-banners/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capture-banners", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nguyenyou/scalex.git --path .agents/skills/capture-banners

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nguyenyou/scalex --skill capture-banners -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nguyenyou/scalex capture-banners --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nguyenyou/scalex.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/capture-banners .gemini/skills/capture-banners && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "capture-banners" agent skill from https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners into .gemini/skills/capture-banners/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capture-banners", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nguyenyou/scalex capture-banners

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nguyenyou/scalex --skill capture-banners -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nguyenyou/scalex.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/capture-banners .github/skills/capture-banners && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "capture-banners" agent skill from https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners into .github/skills/capture-banners/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capture-banners", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nguyenyou/scalex --skill capture-banners -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nguyenyou/scalex capture-banners --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nguyenyou/scalex.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/capture-banners .opencode/skills/capture-banners && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "capture-banners" agent skill from https://github.com/nguyenyou/scalex/tree/main/.agents/skills/capture-banners into .opencode/skills/capture-banners/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capture-banners", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: capture-banners
GitHub stars: 109
Token cost: ~586 tokens
SKILL.md length: 218 words
Files: 1
Skills in repo: 3
Repo updated: Sep 18, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Re-render Scalex banner and OG image PNGs from their HTML source files using Chrome DevTools MCP.

Works in 4 steps: Open or navigate to the HTML file using… → Resize the viewport to 1200x630 → Take a screenshot and save directly to… → …
Banner HTML files are edited (slogan changes
SKILL.md covers Banner inventory, Required viewport size, Capture procedure and Notes
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Capture Banners is an agent skill from nguyenyou/scalex. Re-render Scalex banner and OG image PNGs from their HTML source files using Chrome DevTools MCP. Use this skill whenever banner HTML files are edited (slogan changes, color tweaks, layout changes) and the corresponding PNGs need to be regenerated. Triggers on "capture banners", "update banner images", "re-render banners", "regenerate PNGs", or after any edit to files in site/-banner.html or site/og-banner.html.

Its SKILL.md is about 590 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 Testing & QA, covering Browser testing and Social media graphics. It works with Chrome DevTools and Model Context Protocol. The repository describes itself as: Scala code intelligence for coding agents. Zero Build Server. Zero Compilation. Just answers. The licence is MIT.

When your agent uses it

Banner HTML files are edited (slogan changes
Layout changes) and the corresponding PNGs need to be regenerated
Capture banners
Update banner images

Example prompts

“capture banners”
“update banner images”
“re-render banners”
“/capture-banners”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

Open or navigate to the HTML file using a file:// URL
Resize the viewport to 1200x630
Take a screenshot and save directly to the PNG path
Repeat for the remaining 3 banners. You can reuse the same tab by navigating to the next HTML file.

What it can do on your machine

Read from SKILL.md and the folder at commit 9098af8. 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
No scripts in the folder and no shell commands in SKILL.md.
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

Capture Banners loads about 586 tokens when it runs. Until then it costs about 109 tokens; SKILL.md has 218 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~109
When it runs · the whole SKILL.md, loaded when a task matches: ~586

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 nguyenyou/scalex at commit 9098af8, republished under its MIT licence (© nguyenyou). 218 words, ~586 tokens.

Download SKILL.mdSave it as .claude/skills/capture-banners/SKILL.md (or your agent's skills folder).

name: capture-banners
description: Re-render Scalex banner and OG image PNGs from their HTML source files using Chrome DevTools MCP. Use this skill whenever banner HTML files are edited (slogan changes, color tweaks, layout changes) and the corresponding PNGs need to be regenerated. Triggers on "capture banners", "update banner images", "re-render banners", "regenerate PNGs", or after any edit to files in site/*-banner*.html or site/og-banner*.html.

Capture Banners

The Scalex project has 4 banner images that are rendered from HTML source files. When the HTML is edited, the PNGs must be re-captured to stay in sync.

HTML source	PNG output	Purpose
`site/readme-banner-dark.html`	`site/readme-banner-dark.png`	GitHub README banner (dark mode)
`site/readme-banner-light.html`	`site/readme-banner-light.png`	GitHub README banner (light mode)
`site/og-banner.html`	`site/og-banner.png`	OpenGraph social preview (dark)
`site/og-banner-light.html`	`site/og-banner-light.png`	OpenGraph social preview (light)

Required viewport size

All banners are designed at 1200 x 630 pixels. The HTML <body> is hardcoded to this size. The Chrome DevTools viewport must match exactly, otherwise the screenshot will crop or include extra whitespace.

Capture procedure

Use Chrome DevTools MCP tools. For each banner:

Open or navigate to the HTML file using a file:// URL:

file:///absolute/path/to/scalex/site/readme-banner-dark.html

Resize the viewport to 1200x630:

mcp__chrome-devtools__resize_page(width=1200, height=630)

Take a screenshot and save directly to the PNG path:

mcp__chrome-devtools__take_screenshot(
  filePath="site/readme-banner-dark.png",
  format="png"
)

Repeat for the remaining 3 banners. You can reuse the same tab by navigating to the next HTML file.

Notes

The Kestrel mascot image (Kestrel.png) is referenced by relative path in the HTML, so the file:// URL must point to the site/ directory for it to render.
After capturing, the PNGs are ready to commit — no post-processing needed.
If the images look wrong (missing mascot, broken layout), check that the HTML references are correct relative to the site/ directory.

Files

Just SKILL.md in .agents/skills/capture-banners of nguyenyou/scalex.

Open the folder on GitHubat commit 9098af8

Compare with similar skills

Capture Banners 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.

Capture Banners compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Capture Banners this skillnguyenyou/scalex	109	—	~586	Automated safety check: Pass	MIT	23 days ago
Record E2E Giflablup/backend.ai-webui	133	—	~907	Automated safety check: Notes	LGPL-3.0	today
Browser Testing with Chrome DevToolsaddyosmani/agent-skills	105k	4 repos	~3.5k	Automated safety check: Warn	MIT	yesterday
Diff-Driven Smoke TestsSkyvern-AI/skyvern	23k	—	~5.2k	Automated safety check: Pass	AGPL-3.0	yesterday
Mirroir Onboardjfarcand/mirroir-mcp	247	—	~4.4k	Automated safety check: Notes	Apache-2.0	5 days ago
Octocode Chrome Devtoolsbgauryy/octocode	949	—	~1.6k	Automated safety check: Pass	MIT	2 days ago

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Questions about Capture Banners

What does Capture Banners do?

Re-render Scalex banner and OG image PNGs from their HTML source files using Chrome DevTools MCP. Capture Banners is an agent skill from nguyenyou/scalex. Re-render Scalex banner and OG image PNGs from their HTML source files using Chrome DevTools MCP.

When should I use Capture Banners?

Capture Banners fits situations like: banner HTML files are edited (slogan changes; layout changes) and the corresponding PNGs need to be regenerated; capture banners; update banner images.

How do I install Capture Banners in Claude Code?

Run `npx skills add nguyenyou/scalex --skill capture-banners -a claude-code`. Or copy the skill folder (.agents/skills/capture-banners in nguyenyou/scalex) into .claude/skills/capture-banners in your project. Claude Code loads it when a task matches its description.

How do I install Capture Banners in Codex?

Run `npx skills add nguyenyou/scalex --skill capture-banners -a codex`. Or copy the skill folder (.agents/skills/capture-banners in nguyenyou/scalex) into .agents/skills/capture-banners in your project. Codex loads it when a task matches its description.

Can I use Capture Banners 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 nguyenyou/scalex --skill capture-banners -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/capture-banners, .gemini/skills/capture-banners, .github/skills/capture-banners and .opencode/skills/capture-banners in your project.

What does Capture Banners need to run?

SKILL.md names no scripts, command-line tools or credentials: Capture Banners is instructions for the agent only.

Does Capture Banners 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 Capture Banners 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 Capture Banners use?

Capture Banners is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Capture Banners use?

About 586 tokens (SKILL.md is roughly 2.3k 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 Capture Banners?

Skills that share tags, products or a category with Capture Banners: Record E2E Gif (lablup/backend.ai-webui, 133 stars), Browser Testing with Chrome DevTools (addyosmani/agent-skills, 105k stars), Diff-Driven Smoke Tests (Skyvern-AI/skyvern, 23k stars) and Mirroir Onboard (jfarcand/mirroir-mcp, 247 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Capture Banners?

nguyenyou (a GitHub user) maintains it in nguyenyou/scalex, which has 109 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on September 18, 2026.

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

Capture Banners

Install Capture Banners

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Capture Banners

Banner inventory

Required viewport size

Capture procedure

Notes

Files

Compare with similar skills

Similar skills

Record E2E Gif

Browser Testing with Chrome DevTools

Diff-Driven Smoke Tests

Mirroir Onboard

Octocode Chrome Devtools

System Bridge Testing Workflow

More from nguyenyou/scalex

Scalex

Benchmark

Questions about Capture Banners

Install Capture Banners

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Capture Banners

Banner inventory

Required viewport size

Capture procedure

Notes

Files

Compare with similar skills

Similar skills

More from nguyenyou/scalex

Related

Questions about Capture Banners