Svelte MCP is a server that connects AI agents to tools and context for working with Svelte projects through the Model Context Protocol. It supports local development and includes an inspector for testing its HTTP-based MCP endpoint.
Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/sveltejs/ai-toolsnpx agentmods add skills/sveltejs/ai-tools/svelte-code-writerWrote 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.
[](https://agentmods.dev/skills/sveltejs/ai-tools/svelte-code-writer)<a href="https://agentmods.dev/skills/sveltejs/ai-tools/svelte-code-writer"><img src="https://agentmods.dev/badge/skills/sveltejs/ai-tools/svelte-code-writer/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.
<a href="https://agentmods.dev/skills/sveltejs/ai-tools/svelte-code-writer"><img src="https://agentmods.dev/badge/skills/sveltejs/ai-tools/svelte-code-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 7 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 13 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 21 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 29 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 35 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 49 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 52 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 55 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00075 | $0.00562 |
| Opus 5.5 | $0.00030 | $0.00225 |
| Sonnet 5.5 | $0.00015 | $0.00112 |
| Haiku 4.5 | $0.00007 | $0.00056 |
Grade A, and why
svelte-code-writer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- svelte-code-writer — 100% identical, 4 lines differ
What it actually says
CLI tools
You have access to @sveltejs/mcp CLI for Svelte-specific assistance. Use these commands via npx:
List documentation sections
npx @sveltejs/mcp list-sections
Lists all available Svelte 5 and SvelteKit documentation sections with titles and paths.
Get documentation
npx @sveltejs/mcp get-documentation "<section1>,<section2>,..."
Retrieves full documentation for specified sections. Use after list-sections to fetch relevant docs.
Example:
npx @sveltejs/mcp get-documentation "$state,$derived,$effect"
Svelte autofixer
npx @sveltejs/mcp svelte-autofixer "<code_or_path>" [options]
Analyzes Svelte code and suggests fixes for common issues.
Options:
--async- Enable async Svelte mode (default: false)--svelte-version- Target version, ideally the full version frompackage.json(e.g.5.16.0) so version-specific suggestions are enabled. The major must be 4 or 5 (default: 5)
Examples:
# Analyze inline code (escape $ as \$)
npx @sveltejs/mcp svelte-autofixer '<script>let count = \$state(0);</script>'
# Analyze a file
npx @sveltejs/mcp svelte-autofixer ./src/lib/Component.svelte
# Target Svelte 4
npx @sveltejs/mcp svelte-autofixer ./Component.svelte --svelte-version 4
Important: When passing code with runes ($state, $derived, etc.) via the terminal, escape the $ character as \$ to prevent shell variable substitution.
Workflow
- Uncertain about syntax? Run
list-sectionsthenget-documentationfor relevant topics - Reviewing/debugging? Run
svelte-autofixeron the code to detect issues - Always validate - Run
svelte-autofixerbefore finalizing any Svelte component
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.
- 5d ago Changed · +7 tokens per session aaa5ef9293b1
- 6d ago Changed bd84222da558
- 1mo ago First seen · 65 lines · 68 tokens per session scan A ccd435bc524f
svelte-code-writer is a skill published in the GitHub repository sveltejs/ai-tools (334 stars, last pushed yesterday), licensed MIT. It adds 75 tokens to every session and 562 once invoked, about $0.0003 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 2026-08-30.
Other skills, from other repositories
shadcn-svelte
Pre-built shadcn-svelte components for json-render Svelte apps. Use when working with @json-render/shadcn-svelte, adding standard UI components to a Svelte catalog, or building Svelte web UIs with shadcn-svelte + Tailwind CSS components.
add-localization
Adds or extends multilingual localization in a Power Pages code-site SPA. Use whenever the user asks to translate, localize, internationalize, support multiple languages, add a language selector, add locale routes, repair an i18n setup, or add languages to an existing React, Vue, Angular, or Astro Power Pages site.
vue-router-best-practices
Vue Router 4 patterns, navigation guards, route params, and route-component lifecycle interactions.
moai-domain-uiux
UI/UX design systems specialist covering accessibility, icons, theming, design tokens, and user experience patterns. Use when working on design systems, WCAG compliance, ARIA patterns, or dark mode theming.
v3-create-crud
A page generator for standard create, read, update, and delete screens, commonly called CRUD screens. It uses Element Plus, a Vue user-interface library, to build tables, searches, pagination, forms, and delete confirmations.
frontend-conventions
Frontend convention reference (SvelteKit / Svelte 5). Auto-injected into frontend-aware agents - not user-invocable.