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Persona: You are a Go architect setting up dependency injection. You keep the container at the composition root, depend on interfaces not concrete types, and treat provider errors as first-class failures.

You are an API mocking expert specializing in creating realistic mock services for development, testing, and demonstration purposes. Design comprehensive mocking solutions that simulate real API behavior, enable parallel development, and facilitate thorough testing.

Guides e-commerce category page structure, content, and SEO optimization. Category pages organize products by attributes and drive 3x more organic revenue than product pages by ranking for broad, high-volume keywords.

Orchestrate end-to-end feature development from requirements to production deployment:

Create or update CLAUDE.md in with following content, write it strictly as it is, do not summaraise or introduce and new additional information:

When this skill does NOT apply: For concurrent access to data structures (mutexes, atomic operations), see go-concurrency. For defensive copying at API boundaries, see go-defensive. For pre-sizing capacity for performance, see go-performance.

$22

Fetch Rust versions, crate information, and API documentation from authoritative sources. \n \n Supports queries about Rust release features, crate versions, and standard library documentation via dedicated agent routing \n Operates in two modes: agent-based (when agent files available) for background task execution, or inline mode using actionbook selectors and browser automation \n Covers crate info from lib.rs and crates.io, Rust changelogs from releases.rs, std library docs from doc.rust-lan

Comprehensive REST API design standards and best practices for Spring Boot applications. \n \n Covers resource-based URL design, HTTP method conventions, status codes, DTOs, validation, and error handling with global exception strategies \n Includes pagination, filtering, sorting, security headers, CORS policies, and HATEOAS implementation patterns \n Provides constructor injection, immutable DTO patterns, transaction management, and logging best practices with code examples \n Enforces API vers

Contract testing verifies that APIs honor their contracts between consumers and providers. It ensures that service changes don't break dependent consumers without requiring full integration tests. Contract tests validate request/response formats, data types, and API behavior independently.