This prompt replaces my startup lawyer.
I was spending an insane amount of money on lawyers for what felt like routine startup contracts. It was a huge drain until I figured out how to turn Claude Opus 4 into a legal eagle. It’s been a total game-changer, saving me thousands every month.
Now, for 90% of our agreements, this AI is drafting bulletproof contracts in minutes. It’s not just about writing the legal text; it’s about making you understand what you’re actually signing.
✍️ The Mega-Prompt That Does It All
I’ve been refining this prompt for a month, and it’s pure gold. It tells Claude to act as a senior tech attorney, and then you just feed it the details. Here’s what makes it so powerful:
📜 It drafts the entire contract from scratch, complete with all the standard protective clauses.
🔬 After every single clause, it adds a “Plain English” explanation so you actually know what it means.
🧱 It automatically flags any critical info you forgot to provide with a “NEEDS INPUT” tag.
⚖️ It even customizes the contract for your specific jurisdiction (like California or the EU).
📌 At the end, it gives you a “Practical Notes” section with negotiation points and common pitfalls.
🚀 Pro-Tips for Bulletproof Results
Getting this right took some trial and error. Here are my hard-won hacks to get the best results:
✅ Always use Claude OPUS 4, not Sonnet. It’s way better at catching tricky edge cases.
✅ Ask for a “red flag review” after it’s done. It’s great at critiquing its own work.
✅ Upload your existing templates to teach it your company’s style.
✅ Tell it to “play devil’s advocate” and find weaknesses opposing counsel might attack.
✅ Generate different versions, like asking for a “more founder-friendly” draft.
🛑 When to Call a Real Lawyer
Look, this isn’t a total replacement. You absolutely still need a real human lawyer for the big, high-stakes stuff.
🚫 High-value deals (think over $1M).
🚫 Mergers, acquisitions, or fundraising rounds.
🚫 Active litigation or legal disputes.
🚫 Anything with a really novel or complex structure.
For everyday contracts like NDAs, MSAs, and employment agreements, this has been incredible. My lawyer hasn’t heard from me in weeks.
Check out the full Reddit post for the complete copy-paste prompt and even more details!
Claude Opus 4 is writing better contracts than lawyers (and explaining them too). Here is the prompt you need to save thousands in legal fees
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