PDF Skill — Docker ({{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

Build the Docker image if not already built:

{{shell}} {{shell.flag}} "docker build -t pdf-skill {{paths.skills}}/bundled-docker/pdf"

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 — do not rely on these for layout fidelity
4. After each meaningful update, re-render pages and verify alignment, spacing, and legibility

Execution Pattern

{{shell}} {{shell.flag}} "docker run --rm -v {{paths.sandbox}}:/output -v {{paths.base}}:/workspace pdf-skill python /workspace/script.py"

Path Conventions

Example: Generate a PDF

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

c = canvas.Canvas('/output/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}} "docker run --rm -v {{paths.sandbox}}:/output -v {{paths.base}}:/workspace pdf-skill python /workspace/script.py"

Example: Extract Text from PDF

# extract_text.py
import pdfplumber

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

Example: Render PDF to PNG

{{shell}} {{shell.flag}} "docker run --rm -v {{paths.sandbox}}:/output -v {{paths.base}}:/workspace pdf-skill pdftoppm -png /workspace/input.pdf /output/page"
# Outputs: page-01.png, page-02.png, etc.

Temp and Output Conventions

• Use /tmp/pdfs/ for intermediate files inside container — delete when done
• Write final artifacts to /output/ inside container
• Access output from host via {{paths.sandbox}}

Dependencies (Included in pdf-skill Image)

• System: poppler-utils (includes pdftoppm)
• Python: reportlab, pdfplumber, pypdf, pypdf2

Fallback: Base Image with Inline Install

{{shell}} {{shell.flag}} "docker run --rm -v {{paths.sandbox}}:/output -v {{paths.base}}:/workspace "appropriate container" bash -c 'apt-get update && apt-get install -y poppler-utils && pip install reportlab pdfplumber pypdf && python /workspace/script.py'"

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