flutter-app-expert-cursorrules-prompt-file

flutter-app-expert-cursorrules-prompt-file is a cursor rule for coding agents from PatrickJS/awesome-cursorrules. It costs 583 tokens per session, scanned A, original, CC0-1.0.

A set of Cursor rules for Flutter app development, including Flutter 3.x, Material 3, clean architecture, the BLoC state-management pattern, dependency injection, error handling, platform conventions, and localisation.

In plain words
What is it for?
Use it when creating or editing Flutter features, widgets, data sources, repositories, use cases, state management, and app-wide utilities.
Why use it?
It provides shared guidance for structuring features and keeping Flutter code consistent as the app grows. BLoC is a pattern for separating screen events and state from the interface.

Cursor rule

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.

agentmods
npx agentmods add rules/patrickjs/awesome-cursorrules/flutter-app-expert-cursorrules-prompt-file
Clone the repo
git clone --depth 1 https://github.com/PatrickJS/awesome-cursorrules

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 flutter-app-expert-cursorrules-prompt-file

README.md
[![agentmods](https://agentmods.dev/badge/rules/patrickjs/awesome-cursorrules/flutter-app-expert-cursorrules-prompt-file.svg)](https://agentmods.dev/rules/patrickjs/awesome-cursorrules/flutter-app-expert-cursorrules-prompt-file)
Your own site
<a href="https://agentmods.dev/rules/patrickjs/awesome-cursorrules/flutter-app-expert-cursorrules-prompt-file"><img src="https://agentmods.dev/badge/rules/patrickjs/awesome-cursorrules/flutter-app-expert-cursorrules-prompt-file.svg" alt="Measured on agentmods" height="20"></a>
Per session 583 This file is loaded in full into every session.
When invoked 583 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.00583 $0.00583
Opus 5 $0.00292 $0.00292
Sonnet 5 $0.00117 $0.00117
Haiku 4.5 $0.00058 $0.00058

Measured 4d ago against content hash c28a40670303, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flutter-app-expert-cursorrules-prompt-file 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 4d 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

Copies of this mod

2 near-identical copies found in the catalogue:

rules/flutter-app-expert-cursorrules-prompt-file.mdc · 111 lines

What it actually says

// Flutter App Expert .cursorrules

// Flexibility Notice

// Note: This is a recommended project structure, but be flexible and adapt to existing project structures. // Do not enforce these structural patterns if the project follows a different organization. // Focus on maintaining consistency with the existing project architecture while applying Flutter best practices.

// Flutter Best Practices

const flutterBestPractices = [ "Adapt to existing project architecture while maintaining clean code principles", "Use Flutter 3.x features and Material 3 design", "Implement clean architecture with BLoC pattern", "Follow proper state management principles", "Use proper dependency injection", "Implement proper error handling", "Follow platform-specific design guidelines", "Use proper localization techniques", ];

// Project Structure

// Note: This is a reference structure. Adapt to the project's existing organization

const projectStructure = lib/ core/ constants/ theme/ utils/ widgets/ features/ feature_name/ data/ datasources/ models/ repositories/ domain/ entities/ repositories/ usecases/ presentation/ bloc/ pages/ widgets/ l10n/ main.dart test/ unit/ widget/ integration/;

// Coding Guidelines

const codingGuidelines = `

  1. Use proper null safety practices
  2. Implement proper error handling with Either type
  3. Follow proper naming conventions
  4. Use proper widget composition
  5. Implement proper routing using GoRouter
  6. Use proper form validation
  7. Follow proper state management with BLoC
  8. Implement proper dependency injection using GetIt
  9. Use proper asset management
  10. Follow proper testing practices `;

// Widget Guidelines

const widgetGuidelines = `

  1. Keep widgets small and focused
  2. Use const constructors when possible
  3. Implement proper widget keys
  4. Follow proper layout principles
  5. Use proper widget lifecycle methods
  6. Implement proper error boundaries
  7. Use proper performance optimization techniques
  8. Follow proper accessibility guidelines `;

// Performance Guidelines

const performanceGuidelines = `

  1. Use proper image caching
  2. Implement proper list view optimization
  3. Use proper build methods optimization
  4. Follow proper state management patterns
  5. Implement proper memory management
  6. Use proper platform channels when needed
  7. Follow proper compilation optimization techniques `;

// Testing Guidelines

const testingTestingGuidelines = `

  1. Write unit tests for business logic
  2. Implement widget tests for UI components
  3. Use integration tests for feature testing
  4. Implement proper mocking strategies
  5. Use proper test coverage tools
  6. Follow proper test naming conventions
  7. Implement proper CI/CD testing `;
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. 4d ago First seen · 111 lines · 0 tokens per session scan A c28a40670303

Subscribe to this mod's changes

flutter-app-expert-cursorrules-prompt-file is a cursor rule published in the GitHub repository PatrickJS/awesome-cursorrules (40,717 stars, last pushed 3mo ago), licensed CC0-1.0. It adds 583 tokens to every session, about $0.0029 per session on Opus 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.