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prompt-engineering

Structure prompts with roles, XML tags, and prefilled output formats.

88|108|Updated Apr 7, 2026
Search Tags:#prompt engineering#system prompt#claude#prompt templates#structured outputs#few-shot examples#JSON formatting
One-click install
npx skills add https://github.com/grandamenium/cortextos --skill prompt-engineering-grandamenium
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: prompt-engineering
Source: https://github.com/grandamenium/cortextos/tree/main/skills/prompt-engineering
Command: npx skills add https://github.com/grandamenium/cortextos --skill prompt-engineering-grandamenium

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps you write prompts that produce clearer, more reliable answers from Claude, reducing back-and-forth and ambiguous results.

Core Features & Use Cases

  • Structured prompting templates: Use role, task, and input sections (e.g., with XML-style tags) to consistently frame context and instructions.
  • Format-forcing outputs: Encourage predictable responses using examples and response prefill patterns that lock the output into a desired structure.
  • Better reasoning and examples: Improve problem solving with step-by-step guidance and few-shot examples that demonstrate the exact input-output mapping you want.

Quick Start

Ask Claude: Use the provided role, instructions, and XML-tag structure to respond to this customer message, and output the result in the same structured JSON schema as the example.

Frequently Asked Questions about prompt-engineering

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

FAQPage Schema
How do I get consistent JSON formatting from Claude prompts?▼

To get consistent JSON formatting from Claude, apply structured instructions with few-shot examples and response prefill patterns. This approach locks the output into a desired schema, ensuring reliable structured responses across many inputs.

What is the best way to structure a system prompt for Claude?▼

The best way to structure a system prompt for Claude is using XML-style tags to consistently frame roles, tasks, and input sections. This structured prompting template clearly separates context from instructions.

How do I use few-shot examples to improve Claude output reliability?▼

Improve Claude output reliability by adding few-shot examples that demonstrate exact input-output mappings. This pattern provides step-by-step guidance and shows the exact structured response format you expect.

Can I force Claude to respond in a specific schema for customer support?▼

Yes, you can force Claude to respond in a specific schema for customer support by applying format-forcing outputs. Using structured instructions and examples locks responses into consistent formats for deterministic replies.

Why does Claude return ambiguous results when I ask for structured outputs?▼

Claude returns ambiguous results when prompts lack clear boundaries and structured instructions. Adding role framing, XML tags, and few-shot examples reduces back-and-forth by clarifying the exact structured output format required.

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