// Build PowerPoint decks headless with python-pptx. Pairs with excel-author for model-backed decks where every number traces to a workbook cell. Use for pitch decks, IC memos, earnings notes.
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| name | pptx-author |
| description | Build PowerPoint decks headless with python-pptx. Pairs with excel-author for model-backed decks where every number traces to a workbook cell. Use for pitch decks, IC memos, earnings notes. |
| version | 1.0.0 |
| author | Anthropic (adapted by Nous Research) |
| license | Apache-2.0 |
| platforms | ["linux","macos","windows"] |
| metadata | {"hermes":{"tags":["powerpoint","pptx","python-pptx","presentation","finance"],"related_skills":["excel-author","powerpoint"]}} |
Produce a .pptx file on disk using python-pptx. Use when you need to deliver a deck as a file artifact, not drive a live PowerPoint session.
Adapted from Anthropic's pptx-author and pitch-deck skills in anthropics/financial-services. The MCP / Office-JS branches of the originals are dropped — this assumes headless Python.
For the broader, already-shipped PowerPoint authoring skill (slides, speaker notes, embeds, media), see the built-in powerpoint skill. This skill is a lighter-weight pattern tuned for model-backed decks (pitch decks, IC memos, earnings notes) where every number must trace to a source workbook.
./out/<name>.pptx. Create ./out/ if it does not exist.pip install "python-pptx>=0.6"
Title states the takeaway; body supports it. A slide titled "Q3 Revenue" is weak; "Revenue growth accelerated to 14% Y/Y in Q3" is strong.
If a figure on a slide came from ./out/model.xlsx, footnote the sheet and cell.
Revenue: $1,250M (Source: model.xlsx, Inputs!C3)
Never transcribe numbers from memory or from a summary — open the workbook, read the named range, and bind the deck value to it programmatically when you can.
If ./templates/firm-template.pptx exists, load it so the deck inherits branded colors, fonts, and master layouts.
from pptx import Presentation
from pathlib import Path
template = Path("./templates/firm-template.pptx")
prs = Presentation(str(template)) if template.exists() else Presentation()
When fidelity matters (the model's chart styling must match the deck exactly), render the chart to PNG from the source workbook and embed the image. Native pptx.chart charts are fragile and often don't match firm conventions.
from pptx.util import Inches
slide.shapes.add_picture("./out/charts/football_field.png",
Inches(1), Inches(2),
width=Inches(8))
This skill writes a file. It never emails, uploads, or posts. Orchestration layers handle delivery.
from pptx import Presentation
from pptx.util import Inches, Pt
from pptx.dml.color import RGBColor
from pathlib import Path
template = Path("./templates/firm-template.pptx")
prs = Presentation(str(template)) if template.exists() else Presentation()
# Title slide
slide = prs.slides.add_slide(prs.slide_layouts[0])
slide.shapes.title.text = "Project Aurora — Strategic Alternatives"
slide.placeholders[1].text = "Preliminary Discussion Materials"
# Valuation summary slide (title-only layout)
slide = prs.slides.add_slide(prs.slide_layouts[5])
slide.shapes.title.text = "Valuation implies $38–$52 per share across methodologies"
# Add a table bound to model outputs
rows, cols = 5, 4
tbl_shape = slide.shapes.add_table(rows, cols,
Inches(0.5), Inches(1.5),
Inches(9), Inches(3))
tbl = tbl_shape.table
headers = ["Methodology", "Low ($)", "Mid ($)", "High ($)"]
for c, h in enumerate(headers):
tbl.cell(0, c).text = h
# In a real deck, read these from the model workbook with openpyxl
data = [
("Trading comps", "35", "41", "48"),
("Precedent M&A", "39", "45", "52"),
("DCF (base)", "36", "43", "51"),
("LBO (10% IRR)", "33", "38", "44"),
]
for r, row in enumerate(data, start=1):
for c, val in enumerate(row):
tbl.cell(r, c).text = val
# Embed a chart rendered from the model
slide = prs.slides.add_slide(prs.slide_layouts[5])
slide.shapes.title.text = "Football field — current price $42"
slide.shapes.add_picture("./out/charts/football_field.png",
Inches(1), Inches(1.8), width=Inches(8))
Path("./out").mkdir(exist_ok=True)
prs.save("./out/pitch-aurora.pptx")
Read named ranges or specific cells from your Excel model so deck numbers never drift.
from openpyxl import load_workbook
wb = load_workbook("./out/model.xlsx", data_only=True)
def nr(name):
"""Resolve a named range to its current computed value."""
rng = wb.defined_names[name]
sheet, coord = next(rng.destinations)
return wb[sheet][coord].value
revenue_fy24 = nr("RevenueFY24")
implied_mid = nr("ImpliedSharePriceBase")
Then build deck content using those values:
slide.shapes.title.text = f"Implied share price of ${implied_mid:.2f} (base case)"
Remember to recalculate the workbook before reading it — openpyxl only sees computed values if something has already calculated the sheet. Run the recalc helper in the excel-author skill first, or open/save through a real Excel session.
A typical banking pitch deck follows this structure. Not prescriptive, but useful as a starting skeleton:
powerpoint skill.powerpoint skill.Conventions adapted from Anthropic's Claude for Financial Services plugin suite, Apache-2.0 licensed. Original: https://github.com/anthropics/financial-services/tree/main/plugins/agent-plugins/pitch-agent/skills/pptx-author