Agent skill

Check Chart Preview

Check chart or multidim preview on the staging server using a browser.

Install Check Chart Preview

skills CLI

$ npx skills add owid/etl --skill check-chart-preview -a claude-code

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

GitHub CLI

$ gh skill install owid/etl check-chart-preview --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/owid/etl.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/check-chart-preview .claude/skills/check-chart-preview && 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 "check-chart-preview" agent skill from https://github.com/owid/etl/tree/master/.claude/skills/check-chart-preview into .claude/skills/check-chart-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-chart-preview", 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/owid/etl/tree/master/.claude/skills/check-chart-preview

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 owid/etl --skill check-chart-preview -a codex

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

GitHub CLI

$ gh skill install owid/etl check-chart-preview --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/owid/etl.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/check-chart-preview .agents/skills/check-chart-preview && 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 "check-chart-preview" agent skill from https://github.com/owid/etl/tree/master/.claude/skills/check-chart-preview into .agents/skills/check-chart-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-chart-preview", 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 owid/etl --skill check-chart-preview -a cursor

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

GitHub CLI

$ gh skill install owid/etl check-chart-preview --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/owid/etl.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/check-chart-preview .cursor/skills/check-chart-preview && 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 "check-chart-preview" agent skill from https://github.com/owid/etl/tree/master/.claude/skills/check-chart-preview into .cursor/skills/check-chart-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-chart-preview", 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/owid/etl.git --path .claude/skills/check-chart-preview

--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 owid/etl --skill check-chart-preview -a gemini-cli

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

GitHub CLI

$ gh skill install owid/etl check-chart-preview --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/owid/etl.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/check-chart-preview .gemini/skills/check-chart-preview && 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 "check-chart-preview" agent skill from https://github.com/owid/etl/tree/master/.claude/skills/check-chart-preview into .gemini/skills/check-chart-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-chart-preview", 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 owid/etl check-chart-preview

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 owid/etl --skill check-chart-preview -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/owid/etl.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/check-chart-preview .github/skills/check-chart-preview && 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 "check-chart-preview" agent skill from https://github.com/owid/etl/tree/master/.claude/skills/check-chart-preview into .github/skills/check-chart-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-chart-preview", 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 owid/etl --skill check-chart-preview -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 owid/etl check-chart-preview --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/owid/etl.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/check-chart-preview .opencode/skills/check-chart-preview && 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 "check-chart-preview" agent skill from https://github.com/owid/etl/tree/master/.claude/skills/check-chart-preview into .opencode/skills/check-chart-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-chart-preview", 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: check-chart-preview
GitHub stars: 158
Token cost: ~1.2k tokens
SKILL.md length: 401 words
Files: 3
Skills in repo: 35
Repo updated: Oct 8, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Check chart or multidim preview on the staging server using a browser.

Works in 3 steps: Get the git branch: git branch… → Compute container name: replace /._ with… → Determine chart type and URL
User wants to visually verify a chart renders correctly on staging
SKILL.md covers Prerequisites, Getting the Staging URL, Checking the Preview and Pushing to Staging First
Runs Python scripts from its folder; calls python, curl and git

What it does

Check Chart Preview is an agent skill from owid/etl. Check chart or multidim preview on the staging server using a browser. Use when user wants to visually verify a chart renders correctly on staging, take a screenshot of a chart, or QA a chart/mdim preview.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `get_chart_png_url.py` and `get_staging_url.py`).

It sits in Data & Analytics, covering Browser automation. The repository describes itself as: A compute graph for loading and transforming OWID's data. The licence is MIT.

When your agent uses it

User wants to visually verify a chart renders correctly on staging
Take a screenshot of a chart
QA a chart/mdim preview

Example prompts

“/check-chart-preview”

Requirements

Python 3

Workflow steps

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

Get the git branch: git branch --show-current
Compute container name: replace /._ with - in branch name, strip any staging-site- prefix, prepend staging-site-, truncate the normalized…
Determine chart type and URL

What it can do on your machine

Read from SKILL.md and the folder at commit bf5dc8e. 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
Ships script files (Python), which the agent can run.
Shell commands in SKILL.md call:
- python
- curl
- git
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use curl and git, which can reach the network depending on how they are called.
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

Check Chart Preview loads about 1.2k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 401 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~56
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

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 owid/etl at commit bf5dc8e, republished under its MIT licence (© owid). 401 words, ~1,181 tokens.

Download SKILL.mdSave it as .claude/skills/check-chart-preview/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: check-chart-preview
description: Check chart or multidim preview on the staging server using a browser. Use when user wants to visually verify a chart renders correctly on staging, take a screenshot of a chart, or QA a chart/mdim preview.
metadata.internal: true
metadata.owner: Marigold

Check Chart/Mdim Preview on Staging

Visually verify that a chart or multidimensional indicator page renders correctly on the staging server.

Prerequisites

A staging server must be running for the current git branch (check via curl -s -o /dev/null -w "%{http_code}" http://<container>/)
The chart/mdim must have been pushed to staging already (either via etlr --watch in VSCode or manually)
For non-trivial UI checks (MDIM dropdowns, link/unlink chips, etc.) the agent-browser skill is needed; for plain PNG snapshots it isn't

Getting the Staging URL

Option 1: Helper script (recommended)

bash

.venv/bin/python .claude/skills/check-chart-preview/get_staging_url.py <slug-or-path>

Accepts chart slugs, mdim slugs, or file paths:

bash

# Chart slug (most common)
.venv/bin/python .claude/skills/check-chart-preview/get_staging_url.py life-expectancy

# Mdim slug
.venv/bin/python .claude/skills/check-chart-preview/get_staging_url.py energy/latest/energy_prices#energy_prices

# Export multidim file path
.venv/bin/python .claude/skills/check-chart-preview/get_staging_url.py etl/steps/viz/chart/energy/latest/energy_prices.config.yml

# Chart file path
.venv/bin/python .claude/skills/check-chart-preview/get_staging_url.py etl/steps/graph/covid/latest/covid-cases.chart.yml

Option 2: Construct manually

Get the git branch: git branch --show-current
Compute container name: replace /._ with - in branch name, strip any staging-site- prefix, prepend staging-site-, truncate the normalized part to 28 chars, strip trailing -
Determine chart type and URL:

File type	URL pattern
`.chart.yml` (simple, no `#` in slug)	`http://<container>/grapher/<slug>`
`.chart.yml` (mdim, `#` in slug)	`http://<container>/admin/grapher/<catalogPath>`
`viz/chart/.config.yml` or `.py`	`http://<container>/admin/grapher/<namespace>/<version>/<shortName>%23<shortName>`

For .chart.yml: the slug is in the YAML slug: field. For mdim slugs containing #, the catalogPath inserts the version from the file path.

For viz chart steps: derive from path etl/steps/viz/chart/<namespace>/<version>/<shortName>.* → catalogPath is <namespace>/<version>/<shortName>#<shortName>.

Checking the Preview

Show full SKILL.md (208 more words)Show less

Recommended: PNG via `/grapher/by-uuid/<UUID>.png` (works for drafts)

The fastest, most reliable way to grab a chart's rendered image — works for drafts as well as published charts, no browser, no auth required. Uses the same render pipeline OWID's public site uses for /grapher/<slug>.png, but addresses the chart by its chart_configs.id UUID, which is published to R2's byUUID/ directory for every chart (whether or not the chart itself is isPublished).

bash

# Resolve slug → by-uuid PNG URL, then fetch
URL=$(.venv/bin/python .claude/skills/check-chart-preview/get_chart_png_url.py <slug-or-id>)
curl -o ai/chart_preview.png "$URL"

Pass extra grapher query params with --<key>=<value>:

bash

.venv/bin/python .claude/skills/check-chart-preview/get_chart_png_url.py <slug> --tab=map
.venv/bin/python .claude/skills/check-chart-preview/get_chart_png_url.py <slug> --tab=chart --time=earliest..2020

The helper queries the staging MySQL via etl.config.OWID_ENV.read_sql (which auto-routes to staging-site-<branch>), so it works as long as the staging server is up and the chart has been pushed.

Use the resulting PNG by reading it directly with the Read tool (Claude can view images).

Fallback: browser preview for `mdim` pages / interactive UI

The by-uuid PNG route renders a single chart frame. For MDIM data pages with dropdowns, or for verifying interactive UI (controls, link/unlink chips, etc.), use the agent-browser skill to navigate to the staging URL from get_staging_url.py and take an in-browser screenshot.

Quick PNG check (published charts only)

For charts that are already published, the slug-based PNG route also works:

bash

curl -o ai/chart_preview.png "http://<container>/grapher/<slug>.png?nocache"

This 404s for drafts — use the by-uuid route above instead.

Pushing to Staging First

If the chart hasn't been pushed yet:

bash

# For graph step charts
.venv/bin/etlr graph://<namespace>/<version>/<slug> --graph --graph-push

# For viz chart steps (charts and MDIMs)
.venv/bin/etlr viz://chart/<namespace>/<version>/<shortName> --grapher

Files

SKILL.md and 2 other files in .claude/skills/check-chart-preview of owid/etl.

SKILL.md
get_chart_png_url.py
get_staging_url.py

Open the folder on GitHubat commit bf5dc8e

Compare with similar skills

Check Chart Preview 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.

Check Chart Preview compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Check Chart Preview this skillowid/etl	158	—	~1.2k	Automated safety check: Pass	MIT	today
Chrome Devtoolseinverne/dotfiles	121	2 repos	~1.6k	Automated safety check: Notes	Apache-2.0	29 days ago
Web Scrapingplatonai/Browser4	1.2k	—	~1.1k	Automated safety check: Pass	Apache-2.0	yesterday
Web Crawlerbyungjunjang/web-crawler	162	—	~7.2k	Automated safety check: Pass	MIT	2 days ago
ScraplingTommy-yw/RunbookHermes	546	4 repos	~2.3k	Automated safety check: Pass	MIT	4 mo ago
Brightdata SDKbrightdata/skills	264	—	~5.2k	Automated safety check: Pass	MIT	yesterday

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Questions about Check Chart Preview

What does Check Chart Preview do?

Check chart or multidim preview on the staging server using a browser. Check Chart Preview is an agent skill from owid/etl. Check chart or multidim preview on the staging server using a browser.

When should I use Check Chart Preview?

Check Chart Preview fits situations like: user wants to visually verify a chart renders correctly on staging; take a screenshot of a chart; QA a chart/mdim preview.

How do I install Check Chart Preview in Claude Code?

Run `npx skills add owid/etl --skill check-chart-preview -a claude-code`. Or copy the skill folder (.claude/skills/check-chart-preview in owid/etl) into .claude/skills/check-chart-preview in your project. Claude Code loads it when a task matches its description.

How do I install Check Chart Preview in Codex?

Run `npx skills add owid/etl --skill check-chart-preview -a codex`. Or copy the skill folder (.claude/skills/check-chart-preview in owid/etl) into .agents/skills/check-chart-preview in your project. Codex loads it when a task matches its description.

Can I use Check Chart Preview 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 owid/etl --skill check-chart-preview -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/check-chart-preview, .gemini/skills/check-chart-preview, .github/skills/check-chart-preview and .opencode/skills/check-chart-preview in your project.

What does Check Chart Preview need to run?

Going by SKILL.md and its folder, Check Chart Preview needs Python for the scripts in its folder and the command-line tools its instructions call (python, curl and git). Our summary lists: Python 3.

Does Check Chart Preview access the network?

SKILL.md contains no URLs. Its commands use curl and git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Check Chart Preview 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 Check Chart Preview use?

Check Chart Preview 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 Check Chart Preview use?

About 1.2k tokens (SKILL.md is roughly 4.7k 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 Check Chart Preview?

Skills that share tags, products or a category with Check Chart Preview: Chrome Devtools (einverne/dotfiles, 121 stars), Web Scraping (platonai/Browser4, 1.2k stars), Web Crawler (byungjunjang/web-crawler, 162 stars) and Scrapling (Tommy-yw/RunbookHermes, 546 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Check Chart Preview?

owid (a GitHub organization) maintains it in owid/etl, which has 158 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 8, 2026.

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

Install Check Chart Preview

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Check Chart/Mdim Preview on Staging

Prerequisites

Getting the Staging URL

Option 1: Helper script (recommended)

Option 2: Construct manually

Checking the Preview

Recommended: PNG via /grapher/by-uuid/<UUID>.png (works for drafts)

Fallback: browser preview for mdim pages / interactive UI

Quick PNG check (published charts only)

Pushing to Staging First

Files

Compare with similar skills

Similar skills

More from owid/etl

Related

Questions about Check Chart Preview

Recommended: PNG via `/grapher/by-uuid/<UUID>.png` (works for drafts)

Fallback: browser preview for `mdim` pages / interactive UI