Contract Diff Comparison

What It Solves

When a contract has been through several revisions, it is hard to tell quickly what changed, which edits affect money, deadlines, or liability, and whether a critical clause was moved or rewritten. Manual line-by-line reading is slow and easy to miss. This skill compares two versions of the same contract at the text level: provide the original and revised versions, then get a severity-sorted diff list with original-to-revised pairs, without replacing legal review.

How It Works

The skill aligns the two texts paragraph by paragraph and marks three types of changes: additions present only in the revised version, deletions missing from the revised version, and modifications where the same position has different wording. It then groups results by impact:

• Critical clause changes: amounts, deadlines, liability, penalties, intellectual property, and similar terms.
• General clause changes: wording adjustments, ordering changes, and non-core phrasing edits.
• Formatting changes: punctuation, numbering, spacing, etc., listed separately to avoid noise.

The output prioritizes business-relevant changes and shows an original-to-revised comparison. For numeric changes such as amounts, dates, and percentages, it can include impact notes, for example the percentage change in an amount. If needed, it can also generate a short confirmation letter. The report is Markdown, making it easy to paste into docs or email.

Limits

The skill requires two texts; it cannot find issues from a single contract alone. It supports Chinese and English contracts, but PDF and Word files should be converted to plain text or Markdown first. Keep a single comparison under roughly 5,000 words; longer contracts are better handled section by section. It describes differences only and does not judge legal validity, risk, or commercial reasonableness. It is not a replacement for code diffs, contract drafting, signature workflows, or collaborative editing history. If the contract contains sensitive company names, amounts, or clauses, redact them before submission.