Ppt Editing Skill

PPTX Editing Skill

Provides workflows for editing existing PowerPoint presentations via XML manipulation and template-based approaches.

Template-Based Workflow

1. Copy and analyze: cp template.pptx template.pptx && python -m markitdown template.pptx > template.md
2. Plan slide mapping: Match content sections to template slides
3. Unpack: Extract PPTX into editable XML using Python's zipfile
4. Build: Delete/duplicate/reorder slides in presentation.xml
5. Edit content: Update text in each slide{N}.xml
6. Clean: Remove orphaned files
7. Pack: Repack XML tree into PPTX file

Code Example: Extract Text from PPTX

python -m markitdown presentation.pptx

Code Example: Unpack PPTX for Editing

import zipfile
import os

with zipfile.ZipFile("template.pptx", "r") as z:
    z.extractall("unpacked/")

Code Example: Repack PPTX

import zipfile

with zipfile.ZipFile("edited.pptx", "w", zipfile.ZIP_DEFLATED) as z:
    for root, dirs, files in os.walk("unpacked/"):
        for file in files:
            path = os.path.join(root, file)
            arcname = os.path.relpath(path, "unpacked/")
            z.write(path, arcname)

Common Pitfalls

• Forgetting to clean orphaned files: Remove slides not in <p:sldIdLst>
• Smart quotes: Use XML entities (“) for quotes, not raw characters
• Temp file path: Write to /tmp/ first when repacking (zipfile.seek fails on some mounts)
• Subagent editing: Use one subagent per slide XML file for parallel editing

Verification Checklist

• template.md extracted and content verified
• Slide structure changes complete before text editing
• Orphaned files cleaned after structural changes
• All placeholder text replaced
• Final edited.pptx generated and content verified