Meilleures pratiques d'ingénierie de prompts en 2026

The Fundamentals

Prompt engineering is the skill of communicating clearly with AI models. In 2026, models are smarter, but good prompts still make a dramatic difference.

Core Techniques

• Be Specific: Instead of "write an email", say "write a professional email to a client explaining a 2-week delay in project delivery".
• Provide Context: Give the model background information it needs.
• Use Examples: Few-shot prompting (2-3 examples) dramatically improves output quality.
• Define Output Format: Specify JSON, markdown, bullet points, or any structure.
• Iterate: Treat prompting as a conversation. Refine based on outputs.

Advanced Patterns

• Chain of Thought: Ask the model to think step by step.
• Role Assignment: "You are a senior backend engineer reviewing this code..."
• Constraint Setting: "Respond in exactly 3 paragraphs. Do not use jargon."
• Meta-Prompting: Ask the model to generate a better version of your prompt.

Common Mistakes

• Being too vague or too verbose
• Not providing enough context
• Forgetting to specify the desired output format
• Assuming the model knows your domain-specific terminology