Why This Gets Starred

• It actually renders. 16 chart patterns produce real SVG slides — waterfall, executive summary, 2×2, scatter, heatmap, Gantt, small multiples, cover, and more. Every gallery image below is committed renderer output, verified fresh by CI on every push.
• Animated HTML decks from one command. Combine slides into a single self-contained HTML file: quiet staggered reveals, keyboard navigation, progress bar, zero external requests. Press p → your browser prints it → you have a PDF.
• Works with your slide tools. The SVGs drop straight into PowerPoint, Keynote, and Word (Insert → Picture). For Google Slides, export PNG from any browser first.
• Japanese business documents are first-class. CJK text wraps correctly (measured per fullwidth character, not by spaces), fonts fall back to Noto Sans JP / Hiragino, and there are dedicated profiles for 稟議書, 役員会資料, 週報, 学会抄録.
• Charts that survive an audit. Bar proportions match the data (Lie Factor ≈ 1.0), zero baselines are marked, cell text passes WCAG AA contrast across the whole color ramp, and the accent navy stays readable in greyscale print — all of it asserted in the test suite, not promised in prose.
• Roasted by five design legends, then fixed. We ran the whole system through a five-perspective design panel — Tufte's data-ink discipline, an ex-McKinsey chart master, Swiss grid typography, FT-style data journalism, and modern design engineering. They scored it 5.8/10 and listed every flaw. v1.9.0 shipped every fix. Read the receipts.

60-Second Start

# 1. Get it (this is also how you install it as an agent skill)
git clone https://github.com/kgraph57/mckinsey-style-visualization-skill.git ~/.claude/skills/strategy-consulting-visualization
cd ~/.claude/skills/strategy-consulting-visualization

# 2. Render one slide → SVG
python3 scripts/render_slide_spec.py examples/render-specs/arr-waterfall.json -o slide.svg

# 3. Build the full animated deck → one HTML file
python3 scripts/build_html_deck.py --manifest examples/demo-deck.json -o deck.html
open deck.html   # ← arrows to navigate, "p" to print → PDF

Or skip the terminal and just ask your agent:

Use the strategy consulting visualization skill to turn these notes into a board slide:
ARR grew from $10M to $15M. Enterprise added $3M, expansion $2.5M, churn -$0.5M.
The board must decide on implementation capacity investment.

The Pipeline

flowchart LR
    A["Messy notes,<br/>metrics, prose"] --> B["Slide spec<br/>(JSON)"]
    B --> C["SVG slides"]
    C --> D["Animated HTML deck"]
    C --> E["PowerPoint / Keynote / Word<br/>(insert SVG)"]
    D --> F["PDF<br/>(browser print)"]

Specs are plain JSON, so they diff, review, and version like code. The renderer and deck builder are single-file Python scripts with no installs.

Gallery

Every image is committed output of scripts/render_slide_spec.py — CI fails if any of them drifts from what the renderer actually produces. Specs live in examples/render-specs/.

ARR Waterfall	Executive Summary Strip

Small Multiples	Scatter / Correlation

Japanese Board Summary（役員会サマリー）	Cover Slide

Benchmark Table	Distribution

Capacity Gap	Process Flow

16 patterns render to SVG: cover, waterfall, gap, before_after, time_series, benchmark_table, summary_strip, process_flow, funnel, heatmap, gantt, kpi_scorecard, two_by_two, scatter, distribution, small_multiples. Twelve more patterns (Sankey, pyramid, maps, decision trees, …) ship as structured specs and image-generation prompts — the catalog says exactly which is which. We don't pretend.

Animated HTML Decks

python3 scripts/build_html_deck.py cover.json bridge.json summary.json -o deck.html --title "Q4 Review"

One command, one file, and you get:

• Quiet, staggered element reveals on every slide — the restrained kind, not slide-carnival transitions (prefers-reduced-motion respected)
• Keyboard + click navigation, progress bar, slide counter, deep links (deck.html#3)
• Print stylesheet: p or Cmd+P gives you one slide per page → save as PDF
• Zero external requests — fonts, styles, scripts, and SVGs are all inline. Email it, host it, present offline.

Try the committed demo: examples/demo-deck.html (open locally after cloning).

Export Anywhere

Roasted by Five Design Legends

Most chart generators say "beautiful". We wanted defensible, so we convened a five-perspective design review panel (as rigorous AI personas) and told them to be merciless:

Then we shipped every fix in v1.9.0: zero-floor waterfalls, CJK-correct wrapping, no silent truncation, a single re-derived navy that survives greyscale printing, diverging heatmaps for signed data, WCAG-AA cell text asserted across the entire ramp, decoration stripped, a comparison-type gate before every chart choice, and a rubric that now measures data-ink integrity and deck-level storyline logic.

The result is a visual system you can defend in front of a board, an auditor, or a design critic — because it already survived one.

The Discipline Under the Hood

The renderer is the visible part. The skill underneath is a full operating system for executive visualization:

• Message first: every visual starts from the reader's decision, gets a single-proposition insight headline, and only then picks a chart — gated by the five comparison types (component / item / time series / distribution / correlation).
• A real style system: design tokens on an 8px grid, a fixed type scale, one navy, an emphasis ladder (fill > line > text) with hard caps — the same constants the renderer executes.
• A quality rubric with teeth: 24-point scoring across strategy, data integrity, data-ink honesty, hierarchy, portability, and safety, plus blocking gates (no color-only meaning, no invented data, no implied rendering that doesn't exist).
• An adversarial review loop: expert lenses that hunt overclaims, insider jargon, accessibility failures, and cultural assumptions before anything is called publishable.

By Role

The persona playbook gives every role a copy-paste prompt and a rendered example:

Role	Ask For	Rendered Example
Sales	Pipeline QBR, proposal visuals
Project manager / PMO	Roadmap with critical path
Marketing	Channel × segment performance
HR / People ops	Talent scorecard
Product manager	Effort vs. impact prioritization
Engineer / Tech lead	Incident postmortem flow
Researcher / Clinician	Study outcome summary

Japanese business formats (稟議書, 週報・月報, 役員会資料, 学会抄録, 提案書) have dedicated profiles in document-type-profiles.md.

One-Minute Example

Give the skill this:

ARR grew from $10M to $15M.
Enterprise expansion contributed $3M. Existing customers added $2.5M. Churn cost $0.5M.
AI workflow adoption grew from 18% to 64%.
The board needs to decide whether to invest in implementation capacity.

It returns a decision-framed spec — strategic question, single-proposition headline, pattern choice with reasoning, exact values and labels, assumptions, and a rubric score — that renders to the waterfall you saw in the gallery. See the full worked proof: input → slide specs → evaluation.

What You Can Point It At

Install

# Personal skill (Claude Code)
git clone https://github.com/kgraph57/mckinsey-style-visualization-skill.git ~/.claude/skills/strategy-consulting-visualization

# Project skill
git clone https://github.com/kgraph57/mckinsey-style-visualization-skill.git .claude/skills/strategy-consulting-visualization

Verify the package (same checks CI runs):

python3 -m unittest discover -s tests
python3 scripts/validate_skill.py   # → OK: skill package passed validation

The validator re-renders every committed SVG and the demo deck from source specs and fails on any drift — the gallery cannot silently rot.

Star It, Break It, Share It

If this turned your rough notes into a usable slide, star the repo — stars are how other people find tools that actually render instead of hallucinate.

Even better contributions:

• A messy input and the slide it produced (Discussions)
• A business scenario that needs a pattern we don't have (request template)
• An output that's broken, confusing, or overconfident — it becomes a regression test

Disclaimer

This is an independent skill package. It is not affiliated with, endorsed by, or sponsored by McKinsey & Company, Boston Consulting Group, Bain & Company, or any other consulting firm. Named firms may appear only as common style references or search terms.

License

MIT. See LICENSE.