Portaljs Check Data Quality

What it does

When your agent uses it

• A dataset needs a quality check before publishing
• A showcase renders wrong (blank cells
• Garbled numbers
• An unsortable date column) and the cause needs isolating

Example prompts

• “/portaljs-check-data-quality”

Requirements

• Python 3
• Compatibility (from SKILL.md): Claude Code with PortalJS portals (Next.js 14, React 18, Node 18+). Runs from any project via the plugin, a personal ~/.claude/commands install, or a portaljs clone.
• Pre-approved tools (allowed-tools): Bash(curl:*), Bash(awk:*), Bash(sort:*), Bash(head:*), Bash(wc:*)

Workflow steps

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

1. 1Gather input — the file path or URL to audit. If missing, ask for it; never dead-end.
2. 2Resolve the source: if it's an http/https URL, download it to a temp file first;
3. 3Validate the extension is .csv or .tsv. If not, or the file is missing, or the
4. 4Profile every column: null/blank counts, distinct values, sample values, inferred
5. 5Derive findings from the profiles — duplicate rows, missing-value ratios, invalid
6. 6Assemble the JSON report (status, file metadata, findings, recommendations,
7. 7Relay the report to the user as-is; do not modify the source file, datasets.json,

What it can do on your machine

Read from SKILL.md and the folder at commit d5c096a. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash(curl:*)
  • Bash(awk:*)
  • Bash(sort:*)
  • Bash(head:*)
  • Bash(wc:*)

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • bash

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

• Network

  Links to these hosts (documentation or services it may open):

  • docs.python.org

  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.

• Compatibility

  Claude Code with PortalJS portals (Next.js 14, React 18, Node 18+). Runs from any project via the plugin, a personal ~/.claude/commands install, or a portaljs clone.

  From compatibility in the SKILL.md frontmatter.

Context cost

Portaljs Check Data Quality loads about 1.5k tokens when it runs, and up to ~2.6k if it reads all its reference files. Until then it costs about 82 tokens; SKILL.md has 628 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~82

When it runs · the whole SKILL.md, loaded when a task matches

~1.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.6k

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

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 datopian/portaljs at commit d5c096a, republished under its MIT licence (© datopian). 628 words, ~1,484 tokens.

name

portaljs-check-data-quality

description

Audit a local or remote tabular file (CSV/TSV) for common data quality issues — schema, nulls, types, duplicates. Read-only. Use when a dataset needs a quality check before publishing, or a showcase renders wrong (blank cells, garbled numbers, an unsortable date column) and the cause needs isolating.

allowed-tools

Bash(curl:*), Bash(awk:*), Bash(sort:*), Bash(head:*), Bash(wc:*)

compatibility

Claude Code with PortalJS portals (Next.js 14, React 18, Node 18+). Runs from any project via the plugin, a personal ~/.claude/commands install, or a portaljs clone.

version

1.0.0

author

Datopian <hello@datopian.com>

license

MIT

tags

portaljs, data-portal, data-quality, audit, csv, validation

/portaljs-check-data-quality ./public/data/trash.csv

/portaljs-check-data-quality https://example.com/trash.csv

bash scripts/check-data-quality.sh ./data/emissions.tsv > /tmp/emissions-quality.json

{
  "status": "critical",
  "findings": [
    { "severity": "critical", "check": "duplicate_rows", "message": "42 duplicate rows found." }
  ],
  "recommendations": ["Review and deduplicate repeated rows if they are not intentional."]
}

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

Files

SKILL.md and 1 other file (references) in skills/portaljs-check-data-quality of datopian/portaljs.

• SKILL.md
• references/reference.md

Open the folder on GitHubat commit d5c096a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in datopian/portaljs, which our catalogue first saw on October 7, 2026.

• jeremylongshore/tons-of-skills-marketplaceplugins/community/portaljs/skills/portaljs-check-data-quality