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html-interactive-playground

html-interactive-playground is a skill for Claude Code from f-labs-io/agent-html-skills. It costs 114 tokens per session (2,754 once invoked), scanned A, original, MIT.

An interactive HTML page with controls such as sliders, knobs, and toggles, plus a live preview. It lets you adjust values in a browser and send the chosen settings back to Claude Code.

In plain words
What is it for?
It helps tune algorithm parameters, animations, design tokens, and page layouts. It is also useful for exploring different options before applying the selected values to a project.
Why use it?
Some values, such as animation timing, colors, or layout sizes, are easier to choose by trying them than by describing them in text. It removes repeated guesswork and manual copy-pasting.

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 114 tokens original MIT

Good fit It helps tune algorithm parameters, animations, design tokens, and page layouts. It is also useful for exploring different options before applying the selected values to a project.

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-interactive-playground

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-interactive-playground"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-interactive-playground.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 114 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,754 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 $0.00114 $0.02754
Opus 5.5 $0.00046 $0.01102
Sonnet 5.5 $0.00023 $0.00551
Haiku 4.5 $0.00011 $0.00275

Measured 1mo ago against content hash 7be31be72045, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

html-interactive-playground 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-interactive-playground/SKILL.md · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HTML Interactive Playground

Some values are easier to find by feel than by reasoning — animation timings, easing curves, color combinations, threshold values, layout dimensions. A playground turns the parameter space into a UI: sliders for continuous values, dropdowns for discrete ones, live preview, and a Submit button.

This is the two-way interaction pattern: the user explores in the browser, then submits what worked back to the agent to apply for real.

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

  • "Help me tune X" / "Find the right value for Y"
  • "Try different settings for Z and let me pick"
  • "I'm not sure what value should be / what feels right"
  • "Build a playground for X"
  • Any time the user is in "I'll know it when I see it" territory

Output requirements

Real-time updating preview as the user manipulates controls. One Submit button that calls submitToClaude with the tuned values — the receiving agent reads the standard envelope and applies them.

Critical: the playground must work without explanation. Sliders should be labeled, ranges should be sensible, defaults should be the user's current values (or reasonable starting points).

Core structure

  1. Title — what's being tuned, in plain language
  2. Preview area — the thing the parameters control, prominently shown
  3. Controls — sliders/dropdowns/toggles for each parameter
  4. Current values display — show the chosen values as code/data, updating live
  5. Submit button — one button only. Calls submitToClaude with the chosen values in the standard payload envelope. The receiving agent extracts whatever shape it needs (CSS variables, JSON, JS object) from the envelope when responding — no need for parallel "copy as CSS" / "copy as JSON" buttons on the page.
  6. Reset — back to defaults

Read the full file on GitHub · 162 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 7be31be72045
  2. 2mo ago Changed · -48 lines 44c6078cd578
  3. 2mo ago First seen · 209 lines · 114 tokens per session scan A 0fc75b3f1e7e

Subscribe to this mod's changes

html-interactive-playground is a skill published in the GitHub repository f-labs-io/agent-html-skills (68 stars, last pushed 1mo ago), licensed MIT. It adds 114 tokens to every session and 2,754 once invoked, about $0.0005 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.

CSS and stylingDesign and UXFrontend
Related

html-interactive-playground compared with skills from other repositories

html-interactive-playground next to 6 skills from other repositories
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visual-ralphYeachan-Heo/oh-my-codexSkill34k3d agoMITA52Codex
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frontend-visual-qadaymade/claude-code-skillsSkill1.5kyesterdayMITA125Claude Code, Codex
prototype-webnexu-io/html-anythingSkill9.4k25d agoApache-2.0A24Claude Code, Codex