🏴‍☠️ Claude 4.7 punishes lazy prompts

You type "review this contract" and pray. The model guesses, the output is mush, and you blame the AI. I did this for months. Rewriting the same instructions over and over until something finally clicked, never once stopping to ask if the problem was me.

Then a LinkedIn post stopped my scroll. Someone had taken Anthropic's brand new 31-page prompting guide and crushed it into 10 rules you can use in the next five minutes. I read it twice and changed how I talk to Claude 4.7 that same hour.

Here are the ones that actually moved the needle, why each works, and how to put it to work today.

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Most prompts are wishes. "Review this contract." "Can you help me with this email?" You are describing a vibe and hoping Claude reads your mind. It used to half work. On 4.7 it doesn't.

The fix is to name every single thing you want. "Review this contract. Flag risks per clause. Rate severity 1 to 5. Return as a table." Every verb ships something. Format, scoring, structure, all spelled out instead of assumed.

Same story with length. Say "summarize this" on a 40-page report and Claude sizes the answer to the input, so you get a wall of text back. Cap it hard instead. "5 bullets. Each under 15 words. Start each with an action verb." Constraints are not the enemy of good output. They are how you get it.

The last rule in the whole guide is the same idea in one line: spell out output, order, length, tone, format. Old Claude 4.6 guessed what you meant. New 4.7 does exactly what you typed. If you don't say it, you don't get it.

This is the one I stole first, and the quality jump was immediate.

Negative instructions slip right past the model. "Don't use jargon, don't be salesy" almost never works, because you are still pointing straight at the thing you don't want. The flip: "Write in plain English a 16-year-old could read aloud." Tell Claude what to do, never what to avoid.

I stopped writing "don't do X" on emails and copy and started writing "do Y instead." The output got sharper that same afternoon. One word swap, no extra effort.

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This is the part nobody warns you about. The jump from 4.6 to 4.7 changed three defaults, and if you don't know, the model just feels lazy.

Tool use. Opus 4.7 calls fewer tools on its own than 4.6 did. Sit back waiting for web search to magically happen and you'll wait a long time. Command it: "Use web search aggressively. Verify every claim with at least 2 sources."

Thinking. 4.7 doesn't reason by default anymore. Anthropic calls it adaptive thinking. The free upgrade is to add "Think before answering (maximum reasoning)" to the end of your prompt. Every time. Costs nothing, sharpens everything. On research prompts it feels like flipping a hidden switch.

Effort. Ask for "a landing page" and you get the bare minimum. Add one phrase pulled straight from Anthropic's own doc: "Go beyond the basics." That single line unlocks noticeably better creative output. I now paste it everywhere.

4.7 is more direct, almost zero emojis, and the warm tone older Claude had is dialed way back. Describe the voice you want ("friendly but professional") and you get corporate sludge.

Show it instead. Paste 2 to 3 sentences in the exact voice you're after, then tell Claude to match the rhythm. Pasting my own writing before asking for any draft is a reflex now. The output sounds like me, not a chatbot doing an impression of me.

And when you catch yourself typing the same prompt for the 14th time this week, stop. A skill is just a command with the instructions pre-built. Write the same prompt twice? Make it a skill. Pay the tax once and never again.

Stack the rules above and you get a scaffold that works on almost anything:

"Go beyond the basics. [Task]. Output: [format]. Length: [cap]. Tone: [paste 2 to 3 example sentences here]. Use web search aggressively. Verify every claim with at least 2 sources. Think before answering (maximum reasoning)."

Drop that on a research task, a landing page, or a long email reply and watch the difference. Better yet, save it as a skill so you never type it twice.

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Here's what I love about this breakdown. It's not about magic words. It's about removing ambiguity. Every rule pushes you to be more explicit, more structured, more directive. That's the muscle worth building, and it outlasts any single model version.

If 4.7 has felt colder or lazier than 4.6, this is your fix. The model isn't worse. It's waiting for clearer instructions. Treat your prompt like the product, because right now it is.

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