PDF Skill ({{os}})

When to Use

• Read or review PDF content where layout and visuals matter
• Create PDFs programmatically with reliable formatting
• Validate final rendering before delivery

Setup

uv venv {{paths.base}}/pdf-venv
uv pip install reportlab pdfplumber pypdf pypdf2

Install Poppler for PDF rendering (required for pdftoppm):

Windows:

# Install via winget
winget install poppler

Mac:

brew install poppler

Linux:

apt-get install -y poppler-utils

Workflow

1. Prefer visual review — render PDF pages to PNGs and inspect them
2. Use reportlab to generate new PDFs
3. Use pdfplumber or pypdf for text extraction and quick checks — do not rely on these for layout fidelity
4. After each meaningful update, re-render pages and verify alignment, spacing, and legibility

Example: Generate a PDF

# generate.py — save to {{paths.sandbox}}/generate.py
from reportlab.lib.pagesizes import letter
from reportlab.pdfgen import canvas

c = canvas.Canvas('{{paths.sandbox}}/document.pdf', pagesize=letter)
c.setFont("Helvetica", 16)
c.drawString(72, 700, "Generated PDF Document")
c.save()
print("Saved document.pdf")

Run:

{{shell}} {{shell.flag}} "{{paths.base}}/pdf-venv/bin/python {{paths.sandbox}}/generate.py"

Example: Extract Text from PDF

# extract_text.py
import pdfplumber

with pdfplumber.open('{{paths.sandbox}}/input.pdf') as pdf:
    for page in pdf.pages:
        text = page.extract_text()
        print(text)

Example: Render PDF to PNG

pdftoppm -png {{paths.sandbox}}/input.pdf {{paths.sandbox}}/page
# Outputs: page-01.png, page-02.png, etc.

Path Conventions

Quality Expectations

• Maintain polished visual design: consistent typography, spacing, margins, and section hierarchy
• Avoid rendering issues: clipped text, overlapping elements, broken tables, or unreadable glyphs
• Charts, tables, and images must be sharp, aligned, and clearly labeled
• Use ASCII hyphens only — avoid Unicode dashes (U+2011 etc.)
• Citations and references must be human-readable — never leave placeholder strings

Final Checks

• Do not deliver until the latest PNG inspection shows zero visual or formatting defects
• Confirm headers/footers, page numbering, and section transitions look polished
• Remove intermediate files after final approval

Dependencies

• poppler-utils — pdftoppm for rendering (install via system package manager)
• reportlab — PDF generation
• pdfplumber — text extraction
• pypdf / pypdf2 — PDF manipulation