Coding rules for Svelte, a framework for building web interfaces with reusable components, including its SvelteKit application framework.

Use them when creating or reviewing Svelte components, stores, events, pages, forms, loading states, transitions, and animations.

They help keep components, shared state, forms, routing, and reactive updates consistent and avoid unnecessary browser work.

svelte — Cursor rule for Cursor by rilldata/rill

About the project

Rill is a business intelligence tool for turning data sources into SQL models, metrics, dashboards, and natural-language analysis. It is used by business users and coding agents, with OLAP engines such as ClickHouse and DuckDB supporting its queries. Its catalogue add-ons support agent-driven work on Rill projects.

rilldata/rill · 2,970 stars · on GitHub · rilldata.com

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/rilldata/rill

Made for: Cursor.

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/rules/rilldata/rill/svelte/github.svg)](https://agentmods.dev/rules/rilldata/rill/svelte)

Your own site

<a href="https://agentmods.dev/rules/rilldata/rill/svelte"><img src="https://agentmods.dev/badge/rules/rilldata/rill/svelte/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/rules/rilldata/rill/svelte"><img src="https://agentmods.dev/badge/rules/rilldata/rill/svelte.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 465 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 94% copy Near-identical to another mod 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	$0.00000	$0.00465
Opus 5.5	$0.00000	$0.00186
Sonnet 5.5	$0.00000	$0.00093
Haiku 4.5	$0.00000	$0.00047

Measured 1mo ago against content hash 3c03d53ba3d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

svelte 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 1mo 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.

Origin

This is a copy

94% identical to svelte — 20 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursor/rules/svelte.mdc · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Svelte Best Practices

Component Structure

Keep components small and focused
Use proper TypeScript integration
Implement proper props typing
Use proper event dispatching
Keep markup clean and readable
Use proper slot implementation

Component Events

Avoid using createDispatchEvent and use callback props for handling component events

Reactivity

Use proper reactive declarations
Implement proper stores
Use proper reactive statements
Handle derived values properly
Use proper lifecycle functions
Implement proper bindings

State Management

Use proper Svelte stores
Keep stores modular
Use proper derived stores
Implement proper actions
Handle async state properly
Use proper store subscriptions

Performance

Use proper component lazy loading
Implement proper transitions
Use proper animations
Avoid unnecessary reactivity
Use proper event forwarding
Implement proper key blocks

Routing

Use SvelteKit for routing
Implement proper layouts
Use proper route parameters
Handle loading states properly
Implement proper error pages
Use proper navigation methods

Forms

Use proper form bindings
Implement proper validation
Handle form submission properly
Show proper loading states
Use proper error handling
Implement proper form reset

TypeScript Integration

Use proper component types
Implement proper prop types
Use proper event types
Handle proper type inference
Use proper store types
Implement proper action types

Testing

Write proper unit tests
Implement proper component tests
Use proper testing libraries
Test stores properly
Implement proper mocking
Test async operations

Best Practices

Follow Svelte style guide
Use proper naming conventions
Keep components organized
Implement proper error handling
Use proper event handling
Document complex logic

Build and Tooling

Use Vite for development
Configure proper build setup
Use proper environment variables
Implement proper code splitting
Use proper asset handling
Configure proper optimization

Read the full file on GitHub · 103 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.

1mo ago First seen · 103 lines · 0 tokens per session scan A 3c03d53ba3d4

Subscribe to this mod's changes

svelte is a cursor rule published in the GitHub repository rilldata/rill (2,970 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 465 tokens. A static security scan graded it A with 0 findings. It is 94% identical to svelte, differing in 20 lines, and is treated as a copy.

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