Svelte

What it does

When your agent uses it

• Reviewing Svelte components
• Deciding between runes and legacy reactive statements
• Building SvelteKit routes and load functions
• Migrating a Svelte 4 codebase to Svelte 5

Example prompts

• “/svelte”

Workflow steps

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

1. 1Reactivity is explicit — $state() marks reactive variables, $derived() replaces $: for computed values, $effect() replaces $: {} blocks…
2. 2Event handling is standardized — Svelte 5 treats event handlers as ordinary HTML properties (onclick={handler}) instead of Svelte-specific…
3. 3Component props use let { propName } = $props() instead of multiple export let propName declarations. Mark a prop bindable from the parent…
4. 4Snippets replace slots for most reusable markup — {#snippet name(params)}...{/snippet} and {@render name(args)} reduce duplication and are…

What it can do on your machine

Read from SKILL.md and the folder at commit 7682ca7. 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

  No scripts in the folder and no shell commands in SKILL.md (its code samples are svelte).

  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

Svelte loads about 1.2k tokens when it runs. Until then it costs about 93 tokens; SKILL.md has 477 words of instructions outside code blocks.

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

~93

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

~1.2k

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 Mindrally/skills at commit 7682ca7, republished under its Apache-2.0 licence (© Mindrally). 477 words, ~1,194 tokens.

name

svelte

description

Modern Svelte 5 and SvelteKit development covering runes-based reactivity, snippets, SSR/SSG, and state management, including migration notes from legacy Svelte 4 syntax. Use when writing or reviewing Svelte components, deciding between runes and legacy reactive statements, building SvelteKit routes and load functions, or migrating a Svelte 4 codebase to Svelte 5.

metadata.maintainer

Mindrally

metadata.source

https://github.com/Mindrally/skills

<script>
  let count = 0;
  $: double = count * 2;
  $: {
    if (count > 10) alert('Too high!');
  }
</script>
<button on:click={() => count++}>{count} / {double}</button>

<script>
  let count = $state(0);
  let double = $derived(count * 2);

  $effect(() => {
    if (count > 10) alert('Too high!');
  });
</script>
<button onclick={() => count++}>{count} / {double}</button>

© Mindrally, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in svelte of Mindrally/skills.

Open the folder on GitHubat commit 7682ca7