Comprehensive document creation, editing, and analysis with support for tracked changes, comments, formatting preservation, and text extraction. When Claude needs to work with professional documents (.docx files) for: (1) Creating new documents, (2) Modifying or editing content, (3) Working with tracked changes, (4) Adding comments, or any other document tasks
A user may ask you to create, edit, or analyze the contents of a .docx file. A .docx file is essentially a ZIP archive containing XML files and other resources that you can read or edit. You have different tools and workflows available for different tasks.
Workflow Decision Tree
Reading/Analyzing Content
Use "Text extraction" or "Raw XML access" sections below
Creating New Document
Use "Creating a new Word document" workflow
Editing Existing Document
Your own document + simple changes
Use "Basic OOXML editing" workflow
Someone else's document
Use "Redlining workflow" (recommended default)
Legal, academic, business, or government docs
Use "Redlining workflow" (required)
Reading and analyzing content
Text extraction
If you just need to read the text contents of a document, you should convert the document to markdown using pandoc. Pandoc provides excellent support for preserving document structure and can show tracked changes:
# Convert document to markdown with tracked changes
pandoc --track-changes=all path-to-file.docx -o output.md
# Options: --track-changes=accept/reject/all
Raw XML access
You need raw XML access for: comments, complex formatting, document structure, embedded media, and metadata. For any of these features, you'll need to unpack a document and read its raw XML contents.
word/comments.xml - Comments referenced in document.xml
word/media/ - Embedded images and media files
Tracked changes use <w:ins> (insertions) and <w:del> (deletions) tags
Creating a new Word document
When creating a new Word document from scratch, use docx-js, which allows you to create Word documents using JavaScript/TypeScript.
Workflow
MANDATORY - READ ENTIRE FILE: Read docx-js.md (~500 lines) completely from start to finish. NEVER set any range limits when reading this file. Read the full file content for detailed syntax, critical formatting rules, and best practices before proceeding with document creation.
Create a JavaScript/TypeScript file using Document, Paragraph, TextRun components (You can assume all dependencies are installed, but if not, refer to the dependencies section below)
Export as .docx using Packer.toBuffer()
Editing an existing Word document
When editing an existing Word document, use the Document library (a Python library for OOXML manipulation). The library automatically handles infrastructure setup and provides methods for document manipulation. For complex scenarios, you can access the underlying DOM directly through the library.
Workflow
MANDATORY - READ ENTIRE FILE: Read ooxml.md (~600 lines) completely from start to finish. NEVER set any range limits when reading this file. Read the full file content for the Document library API and XML patterns for directly editing document files.
Unpack the document: python ooxml/scripts/unpack.py <office_file> <output_directory>
Create and run a Python script using the Document library (see "Document Library" section in ooxml.md)
Pack the final document: python ooxml/scripts/pack.py <input_directory> <office_file>
The Document library provides both high-level methods for common operations and direct DOM access for complex scenarios.
Redlining workflow for document review
This workflow allows you to plan comprehensive tracked changes using markdown before implementing them in OOXML. CRITICAL: For complete tracked changes, you must implement ALL changes systematically.
Batching Strategy: Group related changes into batches of 3-10 changes. This makes debugging manageable while maintaining efficiency. Test each batch before moving to the next.
Principle: Minimal, Precise Edits
When implementing tracked changes, only mark text that actually changes. Repeating unchanged text makes edits harder to review and appears unprofessional. Break replacements into: [unchanged text] + [deletion] + [insertion] + [unchanged text]. Preserve the original run's RSID for unchanged text by extracting the <w:r> element from the original and reusing it.
Example - Changing "30 days" to "60 days" in a sentence:
# BAD - Replaces entire sentence
'<w:del><w:r><w:delText>The term is 30 days.</w:delText></w:r></w:del><w:ins><w:r><w:t>The term is 60 days.</w:t></w:r></w:ins>'
# GOOD - Only marks what changed, preserves original <w:r> for unchanged text
'<w:r w:rsidR="00AB12CD"><w:t>The term is </w:t></w:r><w:del><w:r><w:delText>30</w:delText></w:r></w:del><w:ins><w:r><w:t>60</w:t></w:r></w:ins><w:r w:rsidR="00AB12CD"><w:t> days.</w:t></w:r>'
Tracked changes workflow
Get markdown representation: Convert document to markdown with tracked changes preserved:
MANDATORY - READ ENTIRE FILE: Read ooxml.md (~600 lines) completely from start to finish. NEVER set any range limits when reading this file. Pay special attention to the "Document Library" and "Tracked Change Patterns" sections.
Unpack the document: python ooxml/scripts/unpack.py <file.docx> <dir>
Note the suggested RSID: The unpack script will suggest an RSID to use for your tracked changes. Copy this RSID for use in step 4b.
Implement changes in batches: Group changes logically (by section, by type, or by proximity) and implement them together in a single script. This approach:
Makes debugging easier (smaller batch = easier to isolate errors)
Allows incremental progress
Maintains efficiency (batch size of 3-10 changes works well)
Suggested batch groupings:
By document section (e.g., "Section 3 changes", "Definitions", "Termination clause")
By change type (e.g., "Date changes", "Party name updates", "Legal term replacements")
By proximity (e.g., "Changes on pages 1-3", "Changes in first half of document")
For each batch of related changes:
a. Map text to XML: Grep for text in word/document.xml to verify how text is split across <w:r> elements.
b. Create and run script: Use get_node to find nodes, implement changes, then doc.save(). See "Document Library" section in ooxml.md for patterns.
Note: Always grep word/document.xml immediately before writing a script to get current line numbers and verify text content. Line numbers change after each script run.
Pack the document: After all batches are complete, convert the unpacked directory back to .docx:
