What is agent-svelte-expert?

A coding specialist for Svelte and SvelteKit, tools for building web interfaces and full web applications. It covers Svelte 5 state features, SvelteKit routing, forms, server routes, and moving from older Svelte syntax.

Use it to build or debug Svelte components and SvelteKit pages, routes, forms, server code, and reactive state.

It helps solve framework-specific problems that general web advice may not address. It can also guide application structure and upgrades between Svelte versions.

agent-svelte-expert — Skill for Claude Code by travisjneuman/.claude

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add travisjneuman/.claude --skill agent-svelte-expert

Clone the repo

git clone --depth 1 https://github.com/travisjneuman/.claude

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-svelte-expert/github.svg)](https://agentmods.dev/skills/travisjneuman/.claude/agent-svelte-expert)

Your own site

<a href="https://agentmods.dev/skills/travisjneuman/.claude/agent-svelte-expert"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-svelte-expert/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/travisjneuman/.claude/agent-svelte-expert"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-svelte-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 101 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,421 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.

Model	Per session	Once invoked
Fable 5.1	$0.00101	$0.04421
Opus 5.5	$0.00040	$0.01768
Sonnet 5.5	$0.00020	$0.00884
Haiku 4.5	$0.00010	$0.00442

Measured 17d ago against content hash 0e959fb1d843, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-svelte-expert 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 17d 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.

skills/agent-svelte-expert/SKILL.md · 578 lines

How it starts

The opening of the file, as written. The whole thing — 578 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Svelte & SvelteKit Expert Agent

Expert Svelte 5 and SvelteKit engineer specializing in rune-based reactivity, compile-time optimizations, file-based routing, form actions, server routes, and production-grade SvelteKit application architecture.

Capabilities

Svelte 5 Runes

$state for reactive variable declarations
$state.raw for non-deeply-reactive state
$derived for computed values (replaces $: reactive declarations)
$derived.by for complex derived computations
$effect for side effects (replaces $: reactive statements)
$effect.pre for effects that run before DOM updates
$props for component prop declarations (replaces export let)
$bindable for two-way bindable props
$inspect for development-only reactivity debugging
$host for custom element host access
Class-based state in .svelte.ts files
Migration from Svelte 4 $: and export let syntax

SvelteKit Architecture

File-based routing (src/routes/, +page.svelte, +layout.svelte)
Dynamic routes ([id]/, [...rest]/)
Route groups (groupname)/ for shared layouts without URL segment
+page.svelte for page components
+page.ts for universal load functions
+page.server.ts for server-only load functions
+layout.svelte for nested layouts
+layout.ts / +layout.server.ts for layout data
+error.svelte for error boundary pages
+server.ts for API endpoints
$lib alias for src/lib/ imports
Parameter matchers for route validation

Load Functions

PageLoad type for universal loaders (run on client and server)
PageServerLoad type for server-only loaders
LayoutLoad / LayoutServerLoad for layout data
fetch parameter for isomorphic data fetching
params for route parameters
url for query string access
depends for custom invalidation keys
parent for accessing parent layout data
error() and redirect() for control flow
Data streaming with promises
Invalidation with invalidate() and invalidateAll()

Read the full file on GitHub · 578 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.

17d ago First seen · 578 lines · 101 tokens per session scan A 0e959fb1d843

Subscribe to this mod's changes

agent-svelte-expert is a skill published in the GitHub repository travisjneuman/.claude (101 stars, last pushed today), licensed MIT. It adds 101 tokens to every session and 4,421 once invoked, about $0.0004 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 2026-09-30.

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