📖 Lesson content
Summary
The first line of your prompt is the most important part of your entire request. This is where you set the stage for everything that follows, and getting it right can dramatically improve your results.
Being Clear and Direct
When crafting that crucial first line, you want to focus on two key principles: clarity and directness. This means using simple language that leaves no room for ambiguity about what you want Claude to do.

Clear Communication
Being "clear" means:
- Use simple language that anyone can understand
- State exactly what you want without beating around the bush
- Lead with a straightforward statement of Claude's task
Instead of writing something vague like "I need to know about those things people put on their roofs that use sun - those solar panel things, I think they're called," be direct and write: "Write three paragraphs about how solar panels work."
Direct Instructions
Being "direct" focuses on how you structure your request:
- Use instructions, not questions
- Start with direct action verbs like "Write," "Create," or "Generate"
Rather than asking "I was reading about renewable energy and geothermal energy sounds neat. What countries use it?" try: "Identify three countries that use geothermal energy. Include generation stats for each."
Putting It Into Practice
Let's see this technique in action. Starting with a weak prompt that simply asked "What should this person eat?" we can apply our clear and direct approach.
The improved version becomes: Generate a one-day meal plan for an athlete that meets their dietary restrictions.
This revision immediately tells Claude:
- What action to take (generate)
- What to create (a meal plan)
- Key constraints (one day, for an athlete, considering restrictions)
Results Matter
This simple change can make a significant difference in output quality. In our example, the evaluation score jumped from 2.32 to 3.92 - a substantial improvement from just restructuring that opening line.
The key takeaway is that Claude responds best when you treat it like a capable assistant who needs clear direction rather than someone who has to guess what you want. Start strong with a direct action verb, be specific about the task, and you'll see better results right away.
🔁 Related lessons
- Next: Being specific
- Previous: Prompt engineering
- Same section: Overview of Claude Models · Accessing the API · Making a request
- Part of paths: Path C
- Reference docs: Glossary · Skills atlas · By use-case
📚 Source & attribution
- Original Anthropic Academy lesson: https://anthropic.skilljar.com/claude-in-amazon-bedrock/276743
- © 2025 Anthropic. Educational fair-use only.