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PDFs are a different beast from .docx or .xlsx. The user almost never wants to edit the output — they want to send it to someone. So the bar is “this looks like it came out of a design tool, not a spreadsheet.” The pdf skill is built around producing files that meet that bar, not just rendering text into a page.

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The prompt

Generate a styled invoice as a PDF for a freelance design studio called "Northwind Studio".

Bill to: Acme Corp, 123 Main St, San Francisco, CA.
Invoice #2026-0042, dated 2026-04-26, due 2026-05-26.
Line items:
  - Logo redesign ($2,400)
  - Brand guidelines doc ($1,200)
  - 3 x landing page mockup ($800 each)
  - Asset handoff & support ($600).

Subtotal, 8.5% tax, and total.

Use a clean modern layout with the studio name in a colored header band,
monospace numbers, and a thin accent line. Use the pdf skill.
The invoice prompt entered into chat.yambr.com

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What happened

The pdf skill gives the model two things at once: a renderer for new PDFs and a manipulator for existing ones (filling forms, splitting, merging). For an invoice, only the renderer matters. The model produced the file, opened it back to verify the layout (Explored bash_tool, Explored bash_tool — that’s “render → re-open → check”), and confirmed:
Perfect! The invoice PDF has been created successfully.
The math is also visible in the reply: subtotal 6,600,tax(8.56,600, tax (8.5%) 561.00, TOTAL $7,161.00 — matching exactly what the line items add up to.

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The output

Completed Northwind Studio invoice — PDF rendered in the right panel The reply summarizes the design choices the model made:
  • Blue header band featuring “Northwind Studio”
  • Monospace font (Courier) for all numbers
  • Thin blue accent line under the header
  • Professional table layout for line items
  • 8.5% tax calculation: $561.00
  • Bold blue TOTAL: $7,161.00
  • All client details and invoice metadata included
The right-hand preview shows the PDF: header band, “Bill to: Acme Corp / 123 Main St / San Francisco, CA,” invoice metadata aligned right, line-item table with monospace amounts, subtotal/tax/total stacked at the bottom, and “thank you for your business” closing line.

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Why it works

The pdf skill gives the model real document primitives, which means it gets:
  • A real layout grid — header, content, footer; not just “concatenate text.”
  • Custom fonts (Courier for numbers, default sans for body) instead of one-size-fits-all.
  • Math inside the document — subtotal, tax, total are computed in code, not generated as text by the LLM.
That last point matters. When the model “writes” a number into a PDF, it can hallucinate. When the pdf skill computes it from line items, it can’t. The arithmetic in this demo is right because Python computed it. Next: SaaS user-growth chart →