prompt-engineering

Convert vague instructions into clear, role-aware prompts with structured output schemas.

364|53|Updated May 9, 2026
One-click install
npx skills add https://github.com/cosmicstack-labs/mercury-agent-skills --skill prompt-engineering-cosmicstack-labs
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: prompt-engineering
Source: https://github.com/cosmicstack-labs/mercury-agent-skills/tree/main/categories/ai-ml/prompt-engineering
Command: npx skills add https://github.com/cosmicstack-labs/mercury-agent-skills --skill prompt-engineering-cosmicstack-labs

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps you write prompts that consistently produce high-quality outputs by making your intent, constraints, and response format unambiguous for large language models.

Core Features & Use Cases

  • Core prompt patterns: Learn clarity-first instruction writing, role/context framing, and iterative refinement to reduce inconsistent results.
  • Reasoning and example strategies: Use zero-shot, few-shot, and chain-of-thought prompting appropriately for tasks like math, logic, classification, and structured extraction.
  • Output reliability techniques: Apply structured output formats (JSON/XML/markdown tables) and validation-minded prompting to support downstream parsing and automation, including guidance on system vs user prompt layering.

Quick Start

Ask an AI to rewrite your prompt using the “Clarity Over Cleverness” and “Structured Output” sections so it returns valid JSON matching your schema, then test it with one real input.

Frequently Asked Questions about prompt-engineering

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

FAQPage Schema
How do I write LLM prompts that consistently output valid JSON?

To write LLM prompts that output valid JSON, use structured output schemas and validation-minded prompting to constrain response formats. Applying clear constraints and system prompt layering ensures the model returns parseable results for downstream automation.

What is the best way to structure a prompt for complex reasoning tasks?

The best way to structure a prompt for complex reasoning tasks is using chain-of-thought scaffolding. This technique guides the model step-by-step through logic and math problems, significantly reducing inconsistent results.

When should I use few-shot prompting instead of zero-shot guidance?

Use few-shot prompting instead of zero-shot guidance when you need strict output consistency for tasks like classification or structured extraction. Providing examples constrains the model's behavior to match your desired format and logic.

Why does my large language model return inconsistent results for the same prompt?

Your large language model returns inconsistent results due to vague instructions lacking clear constraints and role context. Converting instructions into role-aware, clarity-first prompts reduces ambiguity and improves output reliability.

Can I use role prompting to improve output format control for code generation?

Yes, you can use role prompting to improve output format control for code generation. Framing the model's context and role clarifies intent, which enforces better adherence to structured output schemas and constraints.