
Prompt Engineer
FreeMaster effective prompt design for LLM applications.
Free · Opens the source repo
What Prompt Engineer does
The Prompt Engineer skill is designed for developers and designers who want to enhance their interaction with large language models (LLMs) through effective prompt engineering. This skill emphasizes the importance of crafting precise and structured prompts that guide LLMs to produce the desired outputs. By understanding prompt structure, context management, and output formatting, users can significantly improve the performance of their LLM-powered applications. The skill encourages systematic evaluation and iteration, recognizing that even minor adjustments can lead to substantial changes in model behavior.
This skill covers essential capabilities such as prompt design and optimization, system prompt architecture, and context window management. It also provides guidance on output format specification and prompt testing, ensuring users can create prompts that are not only functional but also effective. The inclusion of few-shot example design allows users to illustrate expected behaviors clearly, making it easier for LLMs to understand and execute tasks accurately.
Users of this skill should possess a foundational understanding of LLMs, tokenization, and basic programming concepts. The skill provides structured patterns for creating system prompts, few-shot examples, and chain-of-thought reasoning, which can be particularly useful for debugging and improving model responses. Additionally, it outlines common anti-patterns to avoid, such as vague instructions and irrelevant context, helping users refine their prompt crafting process.
Overall, the Prompt Engineer skill is a valuable resource for anyone looking to harness the full potential of LLMs by mastering the art of prompt engineering. Whether you are developing applications, conducting research, or exploring creative writing, this skill equips you with the tools needed to create effective prompts that yield better results from LLMs.
When to use it
Use this skill when developing applications that rely on LLMs, especially when precise prompt crafting is essential for desired outcomes.
When not to use it
This skill may not be suitable for users who lack a basic understanding of LLMs or programming, as it requires foundational knowledge to implement effectively.
What you can build with it
Developing an LLM-based Chatbot
Use the Prompt Engineer skill to create structured prompts that guide the chatbot's responses, ensuring clarity and relevance.
Creating Educational Tools
Leverage few-shot examples to design prompts that help students learn through interactive Q&A sessions with an LLM.
Debugging Model Responses
Utilize chain-of-thought prompting to dissect complex model outputs, allowing for step-by-step reasoning and improved accuracy.
How to install Prompt Engineer
View source1. Install with the skills CLI
npx skills add davila7/claude-code-templates/prompt-engineer --agent claude-code2. Or install it manually
Download the skill folder and drop it into ~/.claude/skills/ for all projects, or .claude/skills/ to scope it to one repo. Restart Claude Code so it picks up the new skill.
Anthropic's agentic coding CLI, and the reference implementation of Agent Skills. Drop a skill folder into ~/.claude/skills and Claude Code loads it automatically whenever a task matches the skill's description. Claude Code docs
Inside SKILL.md
Written by davila7Prompt Engineer
Role: LLM Prompt Architect
I translate intent into instructions that LLMs actually follow. I know that prompts are programming - they need the same rigor as code. I iterate relentlessly because small changes have big effects. I evaluate systematically because intuition about prompt quality is often wrong.
Capabilities
- Prompt design and optimization
- System prompt architecture
- Context window management
- Output format specification
- Prompt testing and evaluation
- Few-shot example design
Requirements
- LLM fundamentals
- Understanding of tokenization
- Basic programming
Patterns
Structured System Prompt
Well-organized system prompt with clear sections
- Role: who the model is
- Context: relevant background
- Instructions: what to do
- Constraints: what NOT to do
- Output format: expected structure
- Examples: demonstration of correct behavior
Few-Shot Examples
Include examples of desired behavior
- Show 2-5 diverse examples
- Include edge cases in examples
- Match example difficulty to expected inputs
- Use consistent formatting across examples
- Include negative examples when helpful
Chain-of-Thought
Request step-by-step reasoning
- Ask model to think step by step
- Provide reasoning structure
- Request explicit intermediate steps
- Parse reasoning separately from answer
- Use for debugging model failures
Anti-Patterns
❌ Vague Instructions
❌ Kitchen Sink Prompt
❌ No Negative Instructions
⚠️ Sharp Edges
| Issue | Severity | Solution |
|---|---|---|
| Using imprecise language in prompts | high | Be explicit: |
| Expecting specific format without specifying it | high | Specify format explicitly: |
| Only saying what to do, not what to avoid | medium | Include explicit don'ts: |
| Changing prompts without measuring impact | medium | Systematic evaluation: |
| Including irrelevant context 'just in case' | medium | Curate context: |
| Biased or unrepresentative examples | medium | Diverse examples: |
| Using default temperature for all tasks | medium | Task-appropriate temperature: |
| Not considering prompt injection in user input | high | Defend against injection: |
Related Skills
Works well with: ai-agents-architect, rag-engineer, backend, product-manager
Frequently asked questions about Prompt Engineer
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