Official Guide
4 resources
Prompt engineering overview (Claude docs)
by Anthropic
Official starting point for prompting Claude, with links to each technique.
Prompt design strategies (Gemini API)
by Google
Google's official prompting guide with clear before/after examples.
Prompt engineering (OpenAI API docs)
by OpenAI
OpenAI's official baseline on message roles, instructions and examples.
Prompting best practices (Claude docs)
by Anthropic
Current-model guidance in one page: XML structure, examples, thinking, agentic use. (Old use-xml-tags, multishot and extended-thinking-tips URLs redirect here.)