What Is PromptFu?

PromptFu (promptfu.com) is an independent knowledge hub for developers who work with AI tools and the command line. If you’ve ever copy-pasted a shell command without fully understanding it, lost a useful prompt somewhere in a Slack thread, or wished there was a well-organized reference for the AI tooling you use daily — this site is for you.

The Mission

PromptFu exists to make the day-to-day experience of AI-augmented development faster, clearer, and less frustrating. That means:

• Practical AI prompt guides — not theory, but prompts and patterns you can use right now
• Command line cheat sheets — concise, copy-ready references for the CLI tools developers actually use
• Developer productivity tips — techniques that compound over time and make you measurably faster

The internet has no shortage of AI hype. PromptFu is the opposite of that. Every piece of content here is written for practitioners: people who are building things with AI, shipping code, and looking for signal in the noise.

What You’ll Find Here

AI Prompt Engineering

Working with large language models is increasingly a core developer skill. But writing good prompts — ones that are consistent, testable, and production-worthy — takes practice and knowledge.

PromptFu covers:

• Prompt patterns for real use cases: summarization, code generation, classification, extraction, reasoning chains
• System prompt design: how to structure instructions for reliability, tone, and safety
• LLM evaluation: how to test your prompts so you’re not flying blind in production
• Tool-specific guides: OpenAI API, Anthropic Claude, Google Gemini, local models via Ollama, and the frameworks that wrap them

Whether you’re writing your first GPT-4 integration or tuning a Claude prompt for a production system, PromptFu has reference material that saves you from rediscovering the same lessons everyone else already learned.

Command Line Cheat Sheets

The command line is still the most powerful interface a developer has. PromptFu maintains cheat sheets for the tools that matter:

• Git: branching strategies, rebase workflows, useful aliases
• Docker and containers: the commands you need and the ones you keep forgetting
• Shell scripting: bash patterns, argument handling, process management
• AI-adjacent CLIs: promptfoo, llm, aider, gh, and more

These aren’t exhaustive man-page dumps. They’re the 20% of commands that cover 80% of what you actually do, formatted for fast scanning and quick copy-paste.

Developer Tips and Guides

Beyond prompts and cheat sheets, PromptFu covers the broader context of being a developer in an AI-augmented world:

• How to integrate LLM tooling into CI/CD pipelines
• Editor and IDE integrations that actually improve productivity
• Best practices for keeping AI-generated code reviewable and maintainable
• Evaluation frameworks for teams shipping AI features

Why Independent?

PromptFu is not affiliated with any AI company, cloud provider, or framework vendor. That independence matters.

When you read a tutorial from a company, you’re reading content that exists to drive adoption of their product. That’s not inherently bad — but it means the tutorial won’t tell you when a competing tool is a better fit, or when the “recommended” approach is optimized for their billing model, not yours.

PromptFu has no products to sell and no vendor to favor. The goal is a resource that’s genuinely useful regardless of which model, provider, or toolchain you’re working with.

The Name

“Fu” is borrowed from the phrase kung fu — skill developed through practice and discipline. It’s the same root as “tofu” (fermented skill? — okay, maybe not that one) and reflects the idea that working effectively with the command line and AI tools is a craft.

It’s also short, memorable, and available as a domain. promptfu.com. Simple.

A Note on promptfoo

If you searched for promptfoo (the open-source LLM testing framework) and landed here, welcome — but this is a different thing. Promptfoo is a fantastic tool for automated prompt evaluation; PromptFu is a content site. We cover promptfoo extensively, but we’re not the same project.

See: PromptFu vs promptfoo — What Is the Difference?

Get Started

The best way to explore PromptFu is to browse:

• Blog — longer-form guides, tutorials, and analysis
• Wiki — quick-reference cheat sheets for daily use

If you find something useful, bookmark it. If something is wrong or missing, the site is actively maintained and improved.

Welcome to PromptFu.