Prompt Engineering Patterns skill: what it does and how to install it

What it does. Helps design and refine prompts for LLM applications using few-shot examples, reasoning patterns, reusable templates and structured outputs. It covers iterative testing, output validation, system prompt design and common failure modes, with a LangChain and Pydantic example.

When to use it. Use it when building or debugging prompts for production assistants, especially when outputs need to be consistent, parseable or reusable. It also supports measuring accuracy, latency, token use and success rates.