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# Engineer Design Diagram

Generates production-grade engineering design diagrams as single-file HTML with inline SVG, grounded in real repository topology. Credit: design palette + arrow-masking pattern inspired by [Cocoon AI's architecture-diagram-generator](https://github.com/Cocoon-AI/architecture-diagram-generator) (MIT). See [THIRD_PARTY_LICENSES.md](references/THIRD_PARTY_LICENSES.md).

## Overview

Most diagramming tools produce pretty pictures disconnected from reality. This skill does the opposite: it reads the actual repo (package manifests, docker-compose, k8s, terraform, import graph) and emits a diagram that reflects the real system. It also knows how the system *changed* — PR-diff mode highlights structural deltas, trace mode turns a stack/log into a sequence diagram, and drift mode detects when the architecture has wandered from a stored fingerprint.

Four modes share a common pipeline (DCI grounding → node/edge graph → template fill → fingerprint write). Output is a single self-contained HTML file that opens in any browser, plus a Mermaid text block for copy-paste into docs. Dark theme with semantic OKLCH color coding by component role. Accessible by default (ARIA, `<title>`/`<desc>`, reduced-motion, keyboard navigation).

## Layout Philosophy — pick the shape before you draw

Dense technical systems want to render **wide**. This is how Anthropic docs, Linear docs, and Vercel architecture pages present multi-component systems: a sticky left rail for context (nav, invariants, legend) and a generous main column for the diagram itself. Mimic that pattern when your content is dense, and use the simpler single-SVG hero when it isn't.

Two supported output shapes, one decision up front:
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