Claude 3.5 Sonnet for Rapid Contract Redlining and Legal Review Prep

What You'll Learn

• A complete prompt workflow for first-pass contract review using Claude 3.5 Sonnet
• How to extract key clauses, flag risk, and produce a lawyer-ready pre-read memo
• Prompt variations for NDAs, vendor agreements, and SaaS subscriptions

Legal review is expensive and slow. A single vendor contract review can cost $800 to $2,000 in outside counsel fees and take three to five business days. For executives reviewing multiple agreements per month, this is a material budget line and a bottleneck to closing deals.

The first-pass review is the highest-leverage point. A structured AI review does not replace legal counsel, but it reduces the number of billable hours required by arriving at outside counsel with a clear summary of the issues that need attention.

Claude 3.5 Sonnet's 200K token context window accepts most standard commercial agreements without chunking. Combined with its instruction-following precision, it produces a pre-read memo that compresses a lawyer's first-pass review from hours to minutes.

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The Core Prompt

Copy this prompt exactly. Replace [BUYER/VENDOR/SERVICE PROVIDER] with your organization's role in the agreement. Paste the full contract text after the prompt.

You are a senior corporate attorney reviewing a contract on behalf of an executive client. The client is [BUYER/VENDOR/SERVICE PROVIDER]. Read the full contract below and complete all five tasks in sequence. Task 1: Clause Risk Flags Identify any clauses that deviate significantly from standard commercial terms. For each flagged clause: state the clause name or section number, quote the relevant language (max 50 words), explain the risk in plain language, and rate it High / Medium / Low risk. Task 2: Key Obligations Table Produce a table with three columns: Party, Obligation, Deadline or Trigger. Include all material obligations for both parties. Task 3: Termination and Renewal Analysis List all termination triggers, notice requirements, auto-renewal clauses, and any provisions that survive termination. Be specific about notice periods and deadlines. Task 4: Overall Risk Rating Rate the contract Low / Medium / High risk overall. Provide a three-sentence rationale citing the most significant issues found. Task 5: Executive Pre-Read Memo Write a one-paragraph summary (max 150 words) suitable for a board pre-read. State what the agreement covers, the most significant risk, and the recommended next step. Write in plain English with no legal jargon. [CONTRACT TEXT]

Why This Prompt Works

The five-task structure forces sequential output rather than a single unstructured summary. Each task builds on the previous: clause flags inform the overall risk rating, and the risk rating informs the pre-read memo. The role assignment ("senior corporate attorney reviewing for an executive client") narrows the model's frame of reference to commercial contract norms. The 50-word limit on quoted language keeps the flag list scannable.

Variations by Contract Type

NDA / Confidentiality Agreement

Add after Task 1: "Flag specifically: (a) whether mutual or one-way, (b) definition of Confidential Information and any carve-outs, (c) permitted disclosures, (d) return or destruction obligations, (e) survival period."

SaaS Subscription Agreement

Add after Task 1: "Flag specifically: (a) data ownership and portability provisions, (b) uptime SLA and remedies, (c) data breach notification requirements, (d) liability cap as a multiple of fees paid, (e) indemnification scope."

Vendor / Supplier Agreement

Add after Task 1: "Flag specifically: (a) exclusivity provisions, (b) change-in-control triggers, (c) IP ownership of work product, (d) acceptance testing requirements, (e) payment terms and late fee provisions."

Time and Cost Impact

Manual first-pass review (no AI): approximately 110 minutes per contract. With this workflow: approximately 20 minutes. For a General Counsel reviewing eight contracts per month, this recovers approximately 12 hours per month in pre-review preparation time.

Best Practices

• Use Claude.ai, not the API for this workflow. The interface handles copy-paste of full document text without formatting issues.
• Paste as plain text. Use Ctrl+Shift+V (or Cmd+Shift+V on Mac) to strip formatting before pasting.
• Run the prompt before the legal review meeting, not during it. The output is a pre-read brief, not a real-time analysis tool.
• Do not share the AI output directly with outside counsel. Use it to prepare your own questions and focus areas.

The Bottom Line

This prompt is a first-pass review tool, not a legal opinion. Its value is compression: extraction and organization work that previously cost hours compresses to minutes. The legal judgment still belongs with qualified counsel. But that counsel arrives at a meeting with a client who has already identified the five most significant issues and can articulate them clearly.