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Agent skill

Explain Interface

by Lily-404 in Lily-404/blog

Answers "how was this built?" about an interface. An agent skill from Lily-404/blog.

No licenceAuto-check passedFrontend & Design

Install Explain Interface

skills CLI
$ npx skills add Lily-404/blog --skill explain-interface -a claude-code

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

GitHub CLI
$ gh skill install Lily-404/blog explain-interface --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/Lily-404/blog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/explain-interface .claude/skills/explain-interface && 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/

Facts

Skill name
explain-interface
GitHub stars
151
Used in
1 other repo
Token cost
~2.5k tokens
SKILL.md length
1,564 words
Files
6
Skills in repo
8
Repo updated
First seen
Licence
None found

At a glance

Answers "how was this built?" about an interface. An agent skill from Lily-404/blog.

  • Frontend & Design work in your project
  • SKILL.md covers Scope to the question, What you can actually read, The page is evidence, not… and Measured, derived, inferred, plus 5 more sections
  • Calls claude

What it does

Explain Interface is an agent skill from Lily-404/blog. Answers "how was this built?" about an interface. Give it a URL and name the thing you're curious about, and it reads the layers that produce the effect. Reads the whole frontend instead when you don't name a thing. From a screenshot it reconstructs rather than reads and says so.

Its SKILL.md is about 2.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files (for example `agents/openai.yaml`, `find-the-effect.md` and `from-an-image.md`).

It sits in Frontend & Design.

When your agent uses it

  • Frontend & Design work in your project

Example prompts

  • “how was this built?”
  • “Use the explain-interface skill to answer "how was this built?" about an interface. An agent skill from Lily-404/blog”
  • “/explain-interface”

Requirements

  • Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit cce7f29. 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

    Shell commands in SKILL.md call:

    • claude

    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

Explain Interface loads about 2.5k tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 1,564 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~75
When it runs · the whole SKILL.md, loaded when a task matches
~2.5k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,564 words (~2,529 tokens).

“This skill answers how something was built. /explain-interface how the gradient on example.com was built finds the layers producing that gradient and explains what each one contributes.”

— opening of SKILL.md by Lily-404
name
explain-interface
disable-model-invocation
true

Read the full SKILL.md on GitHub

Files

SKILL.md and 5 other files in .agents/skills/explain-interface of Lily-404/blog.

  • SKILL.md
  • agents/openai.yaml
  • find-the-effect.md
  • from-an-image.md
  • no-browser.md
  • read-the-system.md

Open the folder on GitHubat commit cce7f29

Used in 1 other repository

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in Lily-404/blog, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Explain Interface 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.

Explain Interface compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Explain Interface this skillLily-404/blog1511 repos~2.5kAutomated safety check: PassNone
Web Artifacts Builderanthropics/skills180k40 repos~769Automated safety check: PassApache-2.0
React Doctormakeplane/plane60k12 repos~657Automated safety check: PassAGPL-3.0
React Composition Patternsvercel-labs/openreview1.7k58 repos~721Automated safety check: PassMIT
Impeccablebestofjs/bestofjs3.1k27 repos~2.6kAutomated safety check: PassMIT
Figma Design System Builderwarpdotdev/warp65k2 repos~4.4kAutomated safety check: PassAGPL-3.0

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More from Lily-404/blog

All 8 skills in this repo

  • Better Writing

    Lily-404/blog

    UX writing and interface copy. An agent skill from Lily-404/blog.

    151 GitHub starsUsed in 3 repos~1.7k tokens
    Auto-check passed

  • Better Typography

    Lily-404/blog

    Web typography. An agent skill from Lily-404/blog.

    151 GitHub starsUsed in 5 repos~2.8k tokens
    Auto-check passed

  • Better Accessibility

    Lily-404/blog

    Accessibility engineering for product interfaces. An agent skill from Lily-404/blog.

    151 GitHub starsUsed in 3 repos~2.2k tokens
    Auto-check passed

  • Better Colors

    Lily-404/blog

    Color systems for digital products. An agent skill from Lily-404/blog.

    151 GitHub starsUsed in 3 repos~2k tokens
    Auto-check passed

  • Better Layout

    Lily-404/blog

    Layout structure for web interfaces. An agent skill from Lily-404/blog.

    151 GitHub starsUsed in 3 repos~1.5k tokens
    Auto-check passed

  • Interface Review

    Lily-404/blog

    Interface review of a change rather than a screen: uncommitted work, the current branch, or a pull request.

    151 GitHub starsUsed in 3 repos~2.7k tokens
    Auto-check passed

Categories

Questions about Explain Interface

What does Explain Interface do?

Answers "how was this built?" about an interface. An agent skill from Lily-404/blog. Explain Interface is an agent skill from Lily-404/blog." about an interface.

When should I use Explain Interface?

Explain Interface fits situations like: frontend & Design work in your project.

How do I install Explain Interface in Claude Code?

Run `npx skills add Lily-404/blog --skill explain-interface -a claude-code`. Or copy the skill folder (.agents/skills/explain-interface in Lily-404/blog) into .claude/skills/explain-interface in your project. Claude Code loads it when a task matches its description.

How do I install Explain Interface in Codex?

Run `npx skills add Lily-404/blog --skill explain-interface -a codex`. Or copy the skill folder (.agents/skills/explain-interface in Lily-404/blog) into .agents/skills/explain-interface in your project. Codex loads it when a task matches its description.

Can I use Explain Interface 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 Lily-404/blog --skill explain-interface -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/explain-interface, .gemini/skills/explain-interface, .github/skills/explain-interface and .opencode/skills/explain-interface in your project.

What does Explain Interface need to run?

Going by SKILL.md and its folder, Explain Interface needs the command-line tools its instructions call (claude). Our summary lists: Node.js.

Does Explain Interface 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 Explain Interface 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 Explain Interface use?

No licence was found for Explain Interface or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Explain Interface use?

About 2.5k tokens (SKILL.md is roughly 10k 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 Explain Interface?

Skills that share tags, products or a category with Explain Interface: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 60k stars), React Composition Patterns (vercel-labs/openreview, 1.7k stars) and Impeccable (bestofjs/bestofjs, 3.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Explain Interface?

Lily-404 (a GitHub user) maintains it in Lily-404/blog, which has 151 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on September 23, 2026.

Source: Lily-404/blog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.