Prompt Engineering Guide for 2026
Modern prompt patterns: roles, constraints, tools, structured outputs, and evaluation loops.
Aifun Editorial··15 min
Prompts still matter
Even with smarter models, clear instructions outperform vague ones—especially in production systems.
Core patterns
- Role + goal + constraints
- Few-shot examples
- Chain-of-thought sparingly
- Structured JSON outputs
- Tool/function calling instructions
Evaluation
Build a small golden set and score outputs before shipping prompt changes.
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