Prompt Engineering Field Guide

250 prompts.
One playbook.

The prompts I actually run. Organized by intent — research, synthesis, code, decisions — with the reasoning beside each one.

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Trevor · Field Guide
Prompt
Engineering
A field guide for operators
250 promptsv. 2026
What's inside

Everything earns its page.

Intent-first organization

Sorted by what you're trying to do — research, critique, synthesize, ship — not by clever category names.

Every prompt reasoned

The why beside the what. You'll know how to modify each one for your situation, not just copy it.

Works with any model

Tested on Claude, GPT, and Gemini. Differences are flagged where they matter.

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The meta-prompt

The prompt I use to generate new prompts. Useful forever — you won't need the book twice.

Free updates

New edition every 6 months, free for life. You buy once.

Copy-ready

Delivered as PDF plus a structured JSON file you can feed into any tool you like.

Sample prompt

One page from the guide.

Prompt #042 — Critique before synthesisClaude · GPT-5 · Gemini 2.5
# Why this works Asking the model to critique before synthesizing prevents the most common failure mode: confident, uncritical merging of conflicting sources. <instructions> You will receive 2–5 source excerpts inside <source> tags. Do the following, in order: 1. For each source, name its central claim in one sentence. 2. Surface the 1–3 disagreements between sources. 3. Only then synthesize — and explicitly note which claims you are choosing and which you are dropping. Do not begin synthesis until step 2 is complete. </instructions> <source id="1"> {{paste source 1 here}} </source>
About the author

I ran these. Every single one.

Three years of daily AI writing and six years of shipping AI systems inside other people's companies. Every prompt in this guide is tested against real work, not benchmarks. If something here doesn't move the needle for you, tell me — I'll refund the guide and the email.

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