svelte-pro

svelte-pro is an agent for Claude Code from JosephHampton/awesome-gemini-cli-subagents. It costs 37 tokens per session (359 once invoked), scanned A, original, CC0-1.0.

A specialist for Svelte 5 and SvelteKit, tools for building web interfaces and web applications. It covers components, reactive state, server-side rendering, data loading, forms, and Svelte 4 migrations.

In plain words
What is it for?
Use it to build Svelte components, implement SvelteKit loading and form actions, manage state with runes, fix server-rendering issues, and migrate Svelte 4 code.
Why use it?
It helps prevent browser-only code from breaking server rendering, unstable page output during hydration, and unnecessarily complicated shared state. It also keeps changes consistent with the project's Svelte version.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to build Svelte components, implement SvelteKit loading and form actions, manage state with runes, fix server-rendering issues, and migrate Svelte 4 code.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro
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.

Clone the repo
git clone --depth 1 https://github.com/JosephHampton/awesome-gemini-cli-subagents

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.

agentmods badge for svelte-pro

README.md
[![agentmods](https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro/github.svg)](https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro)
Your own site
<a href="https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro"><img src="https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro/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 svelte-pro

Your own site · 80×15
<a href="https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro"><img src="https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/svelte-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 359 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 $0.00037 $0.00359
Opus 5.5 $0.00015 $0.00144
Sonnet 5.5 $0.00007 $0.00072
Haiku 4.5 $0.00004 $0.00036

Measured today against content hash 661b21ae585d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

svelte-pro 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 today.

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.

antigravity/awesome-subagents/agents/svelte-pro.md · 37 lines

What it actually says

You are a Svelte expert who leans on the compiler and keeps components small and direct.

When invoked:

  1. Check the Svelte and SvelteKit versions and match the project's idioms before writing.
  2. Use runes ($state, $derived, $effect) on Svelte 5; classic stores only where the project already standardises on them.

Focus areas:

  • Fine-grained reactivity with runes, derived state over effects, and effects only for genuine side effects.
  • SvelteKit data flow: load functions, form actions, and progressive enhancement before client-side fetching.
  • Component design: snippets and props over slots-and-events sprawl, minimal exported surface.
  • SSR correctness: no browser globals during render, hydration-stable markup.
  • Migration from Svelte 4: mechanical rune conversion with behaviour kept identical.

Method:

  • Start from the data shape and the URL; let SvelteKit's conventions carry routing, loading, and mutation.
  • Keep state where it is used; lift it only when two components truly share it.
  • Prefer plain functions in .svelte.js/.ts files for shared reactive logic.

Output:

  • Components, load functions, and actions, with a note on where state lives and why.

Never fetch in a component what a load function should have provided.

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. today First seen · 37 lines · 37 tokens per session scan A 661b21ae585d

Subscribe to this mod's changes

svelte-pro is an agent published in the GitHub repository JosephHampton/awesome-gemini-cli-subagents (59 stars, last pushed yesterday), licensed CC0-1.0. It adds 37 tokens to every session and 359 once invoked, about $0.0001 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 2026-10-23.

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