prompt-engineer

Design prompts, evaluation rubrics, and test suites for LLM applications.

Updated Jan 9, 2026
One-click install
npx skills add https://github.com/dieu-donnee/luxtrax --skill prompt-engineer-dieu-donnee
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: prompt-engineer
Source: https://github.com/dieu-donnee/luxtrax/tree/main/.agent/skills/prompt-engineer
Command: npx skills add https://github.com/dieu-donnee/luxtrax --skill prompt-engineer-dieu-donnee

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writes, refactors, and evaluates prompts for LLMs — generating optimized prompt templates, structured output schemas, evaluation rubrics, and test suites. Use when designing prompts for new LLM applications, refactoring existing prompts for better accuracy or token efficiency, implementing chain-of-thought or few-shot learning, creating system prompts with personas and guardrails, building JSON/function-calling schemas, or developing prompt evaluation frameworks to measure and improve model performance.

Core Features & Use Cases

  • Writes, refactors, and evaluates prompts for various LLM applications.
  • Generates optimized prompt templates, structured output schemas, evaluation rubrics, and test suites.
  • Helps with system prompts, chain-of-thought/few-shot strategies, and token efficiency; builds JSON/function-calling schemas and advanced evaluation workflows to measure and improve model behavior.

Quick Start

Create an optimized system prompt template for a customer support bot and test it against edge-case inputs.

Frequently Asked Questions about prompt-engineer

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I design prompt templates and evaluation workflows for LLMs?

Design prompt templates by creating structured system prompts, applying JSON schemas for robust outputs, and building evaluation rubrics and test suites to measure and maximize LLM performance.

How do I create structured JSON schemas for LLM function calling?

Create structured JSON schemas for LLM function calling by designing context-management strategies and guardrails that ensure robust, token-efficient outputs for reproducible testing and measurement of model behavior.

What is the best way to build test suites for prompt evaluation?

The best way to build test suites for prompt evaluation is to generate evaluation rubrics and apply guardrails that enable reproducible testing against edge-case inputs to measure model behavior accurately.

Can I use guardrails to improve LLM output accuracy and token efficiency?

Yes, you can use guardrails to improve LLM output accuracy and token efficiency by applying context-management strategies and structured JSON schemas that enforce robust outputs and reproducible testing.

When do I need to refactor existing prompts for better accuracy?

Refactor existing prompts for better accuracy when you need to implement chain-of-thought or few-shot learning strategies, improve token efficiency, or establish evaluation frameworks to measure model performance.

Why does my LLM application return inconsistent outputs without structured schemas?

LLM applications return inconsistent outputs without structured schemas because they lack context-management strategies, JSON schemas, and guardrails necessary to enforce robust outputs and enable reproducible testing.