How to Write Legal Prompts That Actually Work

The Quality of Your Prompt Determines the Quality of Your Output

Attorneys who describe AI as "not good enough for real legal work" almost always have a prompting problem, not a technology problem. Claude AI by Anthropic is capable of producing sophisticated legal analysis, structured memos, and detailed contract reviews — but only when the prompt provides sufficient direction. The gap between a useless AI response and a partner-ready work product is almost entirely a function of prompt quality.

Start with the CRAFT Framework

The foundation of effective legal prompting is the CRAFT framework: Context, Role, Ask, Format, Tone. Every legal prompt should include all five elements. But beyond the framework, there are specific techniques that separate expert legal prompters from beginners.

Technique 1: Be Specific About Jurisdiction and Governing Law

Legal analysis is jurisdiction-dependent. A prompt that asks Claude to "analyze this non-compete" without specifying the state produces generic output. Instead, specify: "Analyze this non-compete under California Business & Professions Code Section 16600 and recent Ninth Circuit decisions." The more specific your jurisdictional context, the more precise the output.

Technique 2: Define the Deliverable, Not the Topic

Weak prompt: "Tell me about employment discrimination law." Strong prompt: "Draft a 3-page research memo analyzing whether our client's termination constitutes disparate treatment under Title VII, applying the McDonnell Douglas burden-shifting framework, with sections for Facts, Legal Standard, Analysis, and Conclusion." Always tell Claude exactly what document you want to receive.

Technique 3: Provide Your Standard or Baseline

When reviewing contracts, don't just ask Claude to "review" — provide a comparison point. Upload your firm's standard terms alongside the opposing party's draft and ask Claude to produce a gap analysis. This gives Claude a concrete basis for identifying deviations rather than relying on generic "market standard" assumptions.

Technique 4: Use Chain-of-Thought for Complex Analysis

For multi-step legal analysis, tell Claude to work through its reasoning explicitly. A prompt like "Before giving your conclusion, first identify the applicable legal standard, then apply each element to the facts, then address potential counterarguments, and only then state your conclusion" produces much more rigorous analysis than "Is this claim viable?"

Technique 5: Specify What You Do Not Want

Claude responds well to negative instructions. If you don't want a general overview, say so: "Do not provide a general overview of contract law. Go directly to the specific provisions at issue." If you don't want hedging, say: "Provide a definitive assessment rather than listing arguments on both sides." Negative constraints sharpen the output significantly.

Technique 6: Iterate, Don't Start Over

Your first prompt rarely produces the final product. Use Claude's conversation memory to refine: "That analysis is good but too general on the damages section. Expand the damages analysis to separately address compensatory, consequential, and punitive damages under Texas law, with statutory caps where applicable." Iterative prompting produces far better results than trying to write the perfect prompt on the first attempt.

Common Prompting Mistakes Lawyers Make

• Too short: "Summarize this contract" gives Claude no direction about what matters.
• Too broad: "Tell me everything about IP law" produces a textbook, not a useful work product.
• No format: Claude will choose its own structure if you don't specify one.
• No audience: A brief for a judge and an email to a client require completely different approaches.
• Forgetting to verify: Prompting is only half the job — always verify Claude's citations and legal conclusions.

For practice-area-specific prompt examples, see our guides on contract review, litigation, and family law. For a complete primer on using Claude in legal practice, start with How to Use Claude AI for Legal Work.

Get the complete guide with 50+ ready-to-use legal prompts organized by practice area.