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Toss Frontend Fundamentals

Checked
leekensei·vlatest·frontend·MIT

Master core HTML, CSS, and JavaScript concepts through interactive exercises and personalized feedback from leekensei's agent.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add leekensei/agent-skills --skill toss-frontend-fundamentals -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

leekensei

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned leekensei/agent-skills at 23917feaef.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
23917feaef
Manifest
skills/toss-frontend-fundamentals/SKILL.md
Scanned
20 files, 1,641 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill provides a foundational understanding of frontend development principles. It enables AI agents to grasp core concepts like HTML structure, CSS styling, and basic JavaScript interactivity – allowing them to assist with tasks ranging from simple webpage creation to debugging existing code. The agent can explain these concepts in plain language or generate snippets of code based on user requests.

When to use it

  • Explaining frontend technologies: A user needs a simplified explanation of how CSS selectors work, or what the difference is between <div> and <section>.
  • Generating basic HTML/CSS: You want an agent to create a simple webpage layout with specific headings and paragraphs.
  • Debugging minor code issues: The agent can assist in identifying syntax errors or styling inconsistencies in existing frontend code.
  • Learning about accessibility best practices: You need guidance on how to make a website more accessible for users with disabilities.

Key capabilities

  • HTML structure and semantics
  • CSS styling and selectors
  • Basic JavaScript interactivity
  • Accessibility considerations

Example prompts

  • "Explain the box model in CSS."
  • "Generate HTML code for a simple navigation bar."
  • "What's wrong with this HTML: <p>This is some text</p>?"

Tips & gotchas

The skill provides fundamentals; more complex frontend frameworks (like React or Angular) are beyond its scope. For advanced tasks, consider combining this skill with other specialized skills.