> ## Documentation Index > Fetch the complete documentation index at: https://kawax.biz/llms.txt > Use this file to discover all available pages before exploring further. # Advanced Topics > Advanced guides on Laravel internals and package development. Deep dives into design patterns, framework source code, and tools for package authors. ## Overview This section covers topics that go beyond the official documentation — areas where you need to read the framework source code to fully understand what's happening. It also serves as a resource for package authors who want to leverage Laravel's internal APIs and extension points. ## Package Development A comprehensive guide to developing Laravel packages, covering service providers, publishing config/views/migrations, facades, auto-discovery, and deferred loading. Set up Orchestra Testbench for Laravel package testing and verify service providers, facades, configuration, and database behavior. Use Testbench Workbench to build a realistic package development environment with routes, migrations, and a local app runtime. Practical guide to maintaining package compatibility across Laravel and PHP major versions, including composer.json updates and GitHub Actions test matrices. Extend GeneratorCommand to provide your own `make:` commands in a Laravel package, covering stubs, namespace control, and testing. ## Framework Internals A deep dive into the Slim Application Skeleton, covering Application::configure() through ApplicationBuilder internals. How to add custom methods to existing Laravel classes using Macroable, without modifying core code. How when() and unless() work internally, and patterns for keeping method chains clean with conditional logic. The abstract base class behind Laravel's driver system. Learn to register custom drivers, extend built-in managers, and use MultipleInstanceManager. How Illuminate\Pipeline\Pipeline works, and how to compose multi-step processing chains with the pipeline pattern. Design of InteractsWithData and how to add Laravel-style data access APIs to your own package classes. How to use Laravel's tap() helper and the Tappable trait, including practical implementation patterns. Use PHP attributes introduced and enhanced in Laravel 13 to declare job and model configuration in a more expressive way. ## Eloquent Deep Dives Implement CastsAttributes for custom casts. Covers Value Object casts, inbound-only casts, cast parameters, and the Castable pattern. How Eloquent model events work and how to use Observer classes to handle them centrally. Includes the #\[ObservedBy] attribute. How local and global scopes work, with a look at SoftDeletingScope internals and practical patterns for multi-tenancy and publish/draft filtering. Laravel Collection internals: historical evolution, class structure, PHPDoc generics, and a practical source-reading path. How HigherOrderCollectionProxy enables the \$collection->map->method() syntax, and practical patterns for Eloquent collections. ## MCP & AI Build a production-ready MCP server using the laravel/mcp package. Covers tools, resources, prompts, authentication, testing, and deployment. Understand the Laravel AI SDK source code and implement custom providers for AI services not supported out of the box. Deep dive into Laravel Boost's extension architecture and implement custom agents using the SupportsGuidelines, SupportsMcp, and SupportsSkills contracts. ## Auth, Validation & More Implement the Guard and StatefulGuard interfaces to build custom authentication guards, from API token auth to multi-guard applications. Extend Laravel's validation with rule objects and closures, from basic implementations to advanced data-aware and validator-aware rules. Configure custom rate limiters with the RateLimiter facade, apply them to routes, and handle high-traffic scenarios with Redis-backed limiting. Master Pest: the Expectation API, datasets, mocking, HTTP fakes, and architecture tests for well-structured codebases. ## Related topics - [Advanced Topics](/en/advanced/index.md) - [Welcome](/index.md) - [GeneratorCommand — Implementing custom make: commands](/en/advanced/generator-command.md) - [Advanced Testing with Pest](/en/advanced/testing-pest.md) - [Building an MCP Server with Laravel](/en/advanced/mcp-server.md)