How to Redline Word Documents in Claude Using MCP

Redlining a Word document in Claude is straightforward once you have the Scaffold MCP connector set up. This guide walks through the complete process — from installing the connector to reviewing AI-proposed tracked changes — so you can start doing real document redline work in your Claude workspace.

The approach works in Claude Web (claude.ai) and Claude Desktop. No Word add-in is required, and nothing needs to be installed on your computer.

What You'll Need

A Scaffold account (the Free plan, at app.scaffoldyourdocs.com)
Access to Claude Web or Claude Desktop
A Word document (.docx) you want to redline

Setup is short, and there is nothing to install.

Why Use MCP Instead of Just Uploading to Claude?

You can upload a Word file directly to Claude and ask it to suggest edits. This works for reading and drafting, but it has significant limitations for redline workflows:

Claude can describe edits but cannot produce a .docx file with real tracked changes
Every session starts fresh — Claude doesn't remember the document from last time
There's no version history and no step where you approve each change before it lands
You have to manually apply every suggested change in Word yourself

The Scaffold MCP connector solves all of these. Claude can read your document, propose specific edits as proper Word tracked changes, explain each change in plain English, and save a new version — all from your chat window. You review and approve changes in Word as you normally would.

If you are starting from two drafts instead of one, use the same workflow for contract comparison: ask Claude what changed, decide which changes matter, and then have Scaffold apply the response as tracked changes. See how to compare two contracts using AI for the comparison workflow.

Step 1: Connect Scaffold to Claude

In Claude (web or Desktop):

Create a Scaffold account at app.scaffoldyourdocs.com if you don't have one
In Claude, go to Customize → Connectors
Choose Add Custom Connector and name it Scaffold
Paste the connector URL:

https://mcp.scaffoldyourdocs.com/mcp

Click Add
When Claude asks you to Connect, verify your email with the code Scaffold sends and approve the connection

No API key required:

You don't copy or paste an API key into Claude, and there is no configuration file to edit. Approving the connection in step 6 is what links Claude to your Scaffold account. The Scaffold in-app guide shows the same steps with screenshots.

Once connected, you'll see Scaffold listed in Claude's available tools. You're ready to work.

Step 2: Upload Your Document

In your Claude conversation, ask Scaffold to receive your file:

"Upload this document to Scaffold so I can redline it."

Then attach your .docx file to the message. Claude will use the Scaffold MCP tool to upload it and confirm it's ready.

Alternatively, you can upload documents directly in your Scaffold account at app.scaffoldyourdocs.com and then reference them by name in Claude.

Step 3: Ask Claude to Redline

Now you can ask Claude to make specific changes. The more specific your instruction, the more precise the result. Some examples:

"Redline this NDA to add a 12-month post-termination confidentiality period. Mark all changes as tracked."

"Review this offer letter and suggest edits to make the compensation language clearer and the at-will clause legally standard. Use tracked changes."

"Remove the liability cap in section 4.2 and replace it with mutual indemnification language. Show as tracked changes with a reason for each edit."

Claude will use the Scaffold MCP tools to analyze your document, propose edits, and save a new version with every change marked as a tracked change in Word format. Each tracked change includes a plain-English explanation of why Claude made that edit.

Step 4: Review the Redlined Document

Once Claude confirms the edits are complete, use the Download button in the Scaffold pane to save the redlined .docx. If you'd rather have it in your inbox, ask Claude to email it to you:

"Email me the redlined version."

Open the file in Microsoft Word (or any .docx viewer). You'll see every proposed change as a tracked revision — insertions underlined, deletions struck through, with margin comments explaining each edit.

From here, the process is exactly like reviewing any redlined document: accept changes you agree with, reject ones you don't, add your own comments, and save your final version.

If you want Claude to make further revisions based on your review, upload the partially-accepted version and continue the conversation.

What Kinds of Documents Work Best?

Scaffold's redlining works well for any document where you want AI to propose specific text changes with justification. Common use cases:

Legal and contracts: NDAs, MSAs, SOWs, vendor agreements, employment contracts. Ask Claude to flag non-standard clauses, add protective language, or align terms with your standard positions.

HR documents: Offer letters, performance improvement plans, employee policies. Ask Claude to standardize language, update policy references, or adjust compensation language.

Consulting deliverables: Reports, proposals, engagement letters. Ask Claude to sharpen executive summaries, tighten recommendations, or align structure with client preferences.

Architecture and AEC: Construction contracts, specification sections, change order language. Ask Claude to add scope exclusions, adjust payment terms, or flag ambiguous scope language.

Tips for Better Redlines

Give Claude context. The more Claude knows about the purpose and audience of the document, the better its edits will be. A quick sentence like "This is a vendor NDA for a SaaS procurement — we're the vendor" produces more targeted edits than no context at all.

Be specific about what you want tracked. If you want all changes tracked, say so. If you want Claude to only track substantive edits (not formatting), say that. Claude follows your instructions.

Review the reasons, not just the changes. Each Scaffold tracked change includes an explanation. Read those. They tell you what Claude was trying to accomplish, which helps you decide whether to accept or reject.

Iterate. Redlining is rarely a one-pass process. Accept the changes you like, reject the others, and ask Claude for a second pass with adjusted instructions. The Scaffold MCP connector maintains document context across turns.

Frequently Asked Questions

Does this require any Word add-in? No. The Scaffold MCP connector is entirely web-based. You download the finished .docx file and open it in Word normally. No add-in is installed, and no machine access is required.

Does it work with Word for Mac? Yes. The output is a standard .docx file with tracked changes. It opens correctly in Word for Mac, Word for Windows, and Word Online.

What if my organization doesn't allow Claude Desktop? Claude Web (claude.ai) also supports MCP integrations. Many organizations that restrict desktop AI agents allow the web-based version. Scaffold works with both.

Can I use this with ChatGPT instead of Claude? Yes. Scaffold also works with ChatGPT, using the same connector URL. The setup process is similar — add Scaffold as a connector in ChatGPT's settings, then verify your email with a code and approve the connection. Claude and ChatGPT are the two assistants Scaffold supports.

Is my document data secure? Your documents are stored in your Scaffold account and accessed only when you explicitly ask Claude to work with them. Scaffold does not share document contents with third parties. The MCP connector uses scoped access — Claude can only see the documents you've uploaded to Scaffold, not your local file system or other services.

Next Steps

Once you're comfortable with basic redlining, explore Scaffold's review and version tools. You can go through Claude's proposed changes one at a time on the Track and approve or reject each one, compare any two versions word by word, and see every version with what went in and what was turned back — useful when a document goes through several rounds of edits.

Start free at app.scaffoldyourdocs.com. No credit card required.