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AI CONTEXT ENGINEERING MDC ARCHITECTURE

.cursorrules & MDC Studio

Configure deterministic AI development boundaries. Generate production-ready rules for Cursor AI, eliminating hallmarked code smells, deprecated methods, and untyped abstractions.

PYTHON Ready

FastAPI (Python 3.12+)

Pydantic v2, async handlers, and strict type union enforcement.

Enforces Python 3.12 type union syntax, async route isolation, and bans untyped dict returns.

Generate Rules for FastAPI
NEXT.JS Ready

Next.js 15+ App Router

React 19 Server Components (RSC), Server Actions, and strict cache boundary guards.

Forces default server component boundaries, restricts "use client", and orchestrates parallel routes.

Generate Rules for Next.js
RUST Ready

Rust Axum & Tokio

High-concurrency async web backend with zero-cost abstractions.

Mandates thiserror for domain boundaries, bans unwrap() in production handlers, and optimizes Tower middleware.

Generate Rules for Rust
REACT Ready

React 19 & Vite Clean Architecture

Component isolation, TanStack Query v5, Zustand, and strict immutability.

Eliminates unnecessary re-renders, enforces custom hook extraction, and establishes accessibility baselines.

Generate Rules for React
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Systematic Guide: Context Engineering with Cursor AI and MDC Directives

Why unconstrained LLMs produce architectural drift and how to establish repository guardrails.

The Problem with Default AI Completions

Large language models are trained on historical code datasets spanning decades. As a result, when an engineer prompts Cursor without explicit rules, the assistant frequently outputs deprecated patterns:

  • Suggesting Next.js Pages router idioms (getStaticProps) inside modern App Router applications.
  • Generating legacy Pydantic v1 methods (dict()) in modern FastAPI Python 3.12 services.
  • Introducing any types and suppressive comments to bypass strict compiler checks.

MDC Architecture: Targeted Subtree Directives

Cursor's new .cursor/rules/*.mdc format enables granular glob matching. For example, a rule targeting app/**/*.tsx enforces React Server Component conventions, while a rule matching app/api/**/*.ts enforces strict runtime Zod validation and rate limiting.

Frequently Asked Questions

What is the difference between legacy .cursorrules and modern .cursor/rules/*.mdc files?

Legacy .cursorrules is a single markdown file placed in the repository root that applies globally to all files. Modern Cursor versions (2024+) support modular .cursor/rules/*.mdc files featuring YAML frontmatter with 'globs' matching specific subtrees, allowing specialized rules for frontend versus backend directories.

How do strict .cursorrules improve Cursor AI code generation?

Without explicit system guidelines, LLMs default to generic patterns, frequently generating deprecated syntax (e.g. Next.js Pages router, Pydantic v1), introducing 'any' types, and injecting noisy console.logs. Tailored rules constrain LLM outputs to modern architectural idioms.

Can I use these rules in Windsurf, Claude Code, or GitHub Copilot?

Yes! While formatted specifically for Cursor IDE's rule engine, the underlying directives can be used as system prompts in CLAUDE.md, GitHub Copilot instructions (.github/copilot-instructions.md), or Windsurf rules.