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html-data-explorer

html-data-explorer is a skill for Claude Code from f-labs-io/agent-html-skills. It costs 149 tokens per session (3,393 once invoked), scanned A, original, MIT.

A skill for creating self-contained HTML pages that let people explore CSV, JSON, log, and event data in a browser. These pages can include filterable tables, faceted search, charts, timelines, and experiment-result dashboards.

In plain words
What is it for?
Use it to browse and filter datasets, find matching rows, chart values, inspect production logs around a time, or build a small browser-based dashboard with the data embedded in the HTML.
Why use it?
It provides a quick, shareable way to inspect data without setting up a large business-intelligence tool or notebook.

Skill for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: mentions Claude Code.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the html-skills plugin — 19 skills shipped together

not rated 68repo +1 changed 1mo ago A scan 149 tokens original MIT

Good fit Use it to browse and filter datasets, find matching rows, chart values, inspect production logs around a time, or build a small browser-based dashboard with the data embedded in the HTML.

Compare 6 skills from other repositories ↓
View source ↗ f-labs-io/agent-html-skills
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add f-labs-io/agent-html-skills
Claude Code
/plugin install html-skills

Made for: Claude Code.

Or install html-skills, the plugin that ships this one along with the rest of its 19 skills.

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.

agentmods badge for html-data-explorer

README.md
[![agentmods](https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-data-explorer/github.svg)](https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-data-explorer)
Your own site
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-data-explorer"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-data-explorer/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.

agentmods 80×15 button for html-data-explorer

Your own site · 80×15
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-data-explorer"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-data-explorer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 149 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,393 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.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00149 $0.03393
Opus 5.5 $0.00060 $0.01357
Sonnet 5.5 $0.00030 $0.00679
Haiku 4.5 $0.00015 $0.00339

Measured 1mo ago against content hash 54df875b13ba, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

html-data-explorer 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 1mo 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.

plugins/html-skills/skills/html-data-explorer/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HTML Data Explorer

For ad-hoc data exploration — a CSV someone pasted, a JSON dump from an API, a log file from production — opening Tableau or even a Jupyter notebook is overkill. A self-contained HTML file with the data baked in, a filterable table, a few charts, and faceted search is faster to build and faster to share.

Pre-flight — run BEFORE writing the artifact

Invoke html-skills:html-skills-listen (Skill tool) first; it is idempotent. If it returns a URL, inject it verbatim as window.__CLAUDE_SUBMIT_URL__ in the HTML you are about to write, ?t= query string included (a local, single-session loopback handshake — not a credential). If it reported web/sandbox mode, leave that line out; submitToClaude then falls back to clipboard mode.

When to use this skill

  • "Look at / analyze / explore this CSV / JSON / log data"
  • "Show me [a chart, filter, breakdown] of this data"
  • "Build me a quick dashboard for X"
  • "Help me find the rows where Y"
  • Pasted tabular data with an implicit "do something useful with this"
  • Log files where the question is "what happened around time T"

Output requirements

Data baked into the file as a JS object/array — no separate file to load, no fetch call. Embed the data only after the mandatory secret-redaction pass below — the artifact is built to be shared, so everything baked in travels with it, including rows and columns the current filter hides. Filtering and charting happens entirely in the browser. Pre-aggregated views update live as filters apply.

If the dataset is large enough that inlining is awkward (>~5MB), still inline it but warn the user about file size — and that the file carries the full dataset, including filtered-out rows; otherwise the artifact loses its "just send the link" superpower.

Redact secrets before embedding (mandatory)

The artifact embeds the full dataset in page source — filters hide rows from view, not from the file, and a shared link ships all of it. Logs and API dumps routinely carry Authorization headers, cookies, and keys. For anything beyond a trivially small dataset, run the scan programmatically — a script/regex pass over every row — never by reading or sampling rows manually; a sample-based scan misses the one row that matters. Before baking data in:

Read the full file on GitHub · 153 lines

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.

  1. 1mo ago Changed · +1 lines 54df875b13ba
  2. 2mo ago Changed · +13 lines a1f32c5d2321
  3. 2mo ago First seen · 139 lines · 149 tokens per session scan A 903b7046306e

Subscribe to this mod's changes

html-data-explorer is a skill published in the GitHub repository f-labs-io/agent-html-skills (68 stars, last pushed 1mo ago), licensed MIT. It adds 149 tokens to every session and 3,393 once invoked, about $0.0006 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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