Design Patterns

Purpose

Guide pattern selection across all categories — GoF, enterprise, integration, concurrency, architectural — with decision trees, applicability rules, trade-off analysis, and composition guidance.

Agent Protocol

Trigger

User request includes: design pattern, gof, gang of four, pattern catalog, creational, structural, behavioral, pattern selection, enterprise pattern, integration pattern, concurrency pattern, architectural pattern, anti-pattern, pattern composition, CQRS, event sourcing, saga, repository, unit of work, messaging pattern, circuit breaker, strangler fig, saga pattern, hexagonal architecture, clean architecture.

Input Context

• Problem statement with constraints (performance, memory, team size, tech stack)
• Current architecture description
• Existing patterns already in use
• Pattern category preference or openness

Output

Selected pattern(s) with rationale, rejected candidates with explicit elimination reasons, implementation sketch, trade-off table, and composition rules if multiple patterns are needed.