diagram-design

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• SKILL.md
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SKILL.md (first lines)

# Diagram Design

Create diagrams as self-contained HTML files with inline SVG and an editorial design system.

Forty-five visual types. Semantic patterns describe behavior; type references describe layout.

---

## 0. First-time setup — style guide gate

**Before generating your first diagram in a new project, verify the style guide has been customized.**

Do not silently ship default-skinned diagrams into a branded project.

First resolve any project `.diagram-design` marker per [`references/profiles.md`](references/profiles.md); a successfully resolved marker selects its profile and bypasses this gate. That reference owns failures, the protected default, and save behavior.

Open [`references/style-guide.md`](references/style-guide.md) and check the default tokens. If they are still the shipped defaults (paper `#f5f5f5`, ink `#2d3142`, accent `#bf4520`), **pause and ask the user**:

> *"This is your first diagram in this project and the style guide is still default. Customize now? Options: (a) website URL, (b) installed skill, (c) local folder/design-system, (d) paste tokens, (e) keep default, (f) load saved profile."*

Then branch per the matching section of [`references/onboarding.md`](references/onboarding.md); for **(f)** follow [`references/profiles.md`](references/profiles.md).

**Once the style guide has been customized** (or the user explicitly chose default), skip this gate on later runs. A leading profile header names the copied-in active profile. Without a header, any semantic-role value or typography family differing from shipped defaults means **custom-unsaved**: skip the gate and offer to save it as a profile. All-default tokens with no marker/header trigger the gate. After onboarding, offer to save as a named client profile per `references/profiles.md`.

---

## 1. Philosophy

**The highest-quality move is usually deletion.**

Applied to schematics:

- Every node represents a distinct idea. Two nodes that always travel together are one node.
- Every connection carries information. If the relationship is obvious from layout, remove the line.
- Coral is **editorial, not a flag.** 1–2 focal nodes per diagram. Using it on 5 nodes erases the signal.
- The schematic isn't done when everything is added. It's done when nothing can be removed.

**Target density: 4/10.** Enough to be technically complete. Not so dense it needs a guide. Above 9 nodes, it's probably two diagrams.

---

## 2. When to Use

Use for any of the 45 visual types (§3) when a reader will learn more from a visual than from prose, a table, or a bulleted list.

**Don't use for:**

- Quick unicode diagrams → a separate plain-text tool such as wiretext. This skill doesn't ship one.
- Lists of things → table or bullets.
- Attribute-only before/after → table; topology changes → Architecture delta.
- One-shape "diagrams" → just write the sentence.

Before drawing, ask: *Would the reader learn more from this than from a well-written paragraph?* If no, don't draw.

---

## 3. Selection: semantic pattern, then visual type

When behavior, state, enforcement, or risk carries the meaning, first load [`references/semantic-patterns.md`](references/semantic-patterns.md) and choose one primary pattern. Then choose the nearest visual type for layout. If no pattern matches, choose the type directly.

| Behavioral trigger | Semantic pattern → nearest type |
|---|---|
| Fan-in, queue depth, finite capacity, bottleneck | **Fan-in queue / bottleneck** → Data flow |
| Repeated Question / Input / Governance / Output slots across stages | **Stage framework with semantic slots** → Process |
| Conversation or loose input becomes a structured durable artifact | **Unstructured input → structured artifact** → Data flow |
| Two rule traces need pass/fail/skipped/not-reached and first divergence | **Paired policy-evaluation traces** → Flowchart |
| Trust boundaries plus permitted/forbidden ingress or deploy paths | **Secure paved road** → Architecture |
| Controls grouped by where they are enforced | **Governance / control catalog** → Layer stack |
| Defenses compensate for prior gaps and residual risk propagates | **Compensating security layers** → Layer stack |
| Hierarchical, ID-addressable decomposition needing per-block I/O, constraints, and a code link | **Traceable block decomposition** → Tree |
| One subject progresses through phases, waits, retries, cancellation, and terminal outcomes | **Lifecycle phase map** → State Machine |

The pattern owns semantic primitives and its tighter budget; the type owns layout grammar. Use [`references/animation.md`](references/animation.md) only when motion is requested or materially clarifies ordered change; static remains the default.

### Visual-type guide (45)

| If you're showing… | Use | Reference |
|---|---|---|
| Components + connections in one snapshot; nested admin vs traffic scopes | **Architecture** | [type-architecture.md](references/type-architecture.md) |
| Structural change between synchronized Before / After topologies, with a Changes ledger | **Architecture delta** | [type-architecture-delta.md](references/type-architecture-delta.md) |
| Legacy IT landscape by phase or department; shows the *before* state | **IT current-state** | [type-it-state.md](references/type-it-state.md) |
| Decision logic with branches | **Flowchart** | [type-flowchart.md](references/type-flowchart.md) |
| Time-ordered messages between actors | **Sequence** | [type-sequence.md](references/type-sequence.md) |
| States + transitions + guards | **State machine** | [type-state.md](references/type-state.md) |
| Entities + fields + relationships | **ER / data model** | [type-er.md](references/type-er.md) |
| Events positioned in time | **Timeline** | [type-timeline.md](references/type-timeline.md) |
| Cross-functional process with handoffs | **Swimlane** | [type-swimlane.md](references/type-swimlane.md) |
| Two-axis positioning / prioritization | **Quadrant** | [type-quadrant.md](references/type-quadrant.md) |
| Multiple entities scored across 3–5 quantitative criteria | **Radar / Spider** | [type-radar.md](references/type-radar.md) |
| One quantitative series across cyclic categories; angle=category, radius=magnitude | **Polar chart** | [type-polar.md](references/type-polar.md) |
| Reinforcing cycle; the last step feeds the first and a hub accumulates state | **Loop** | [type-loop.md](references/type-loop.md) |
| Hierarchy through containment / scope | **Nested** | [type-nested.md](references/type-nested.md) |
| Parent → children relationships | **Tree** | [type-tree.md](references/type-tree.md) |
| Human/agent/team ownership, reporting, routing, escalation | **Org chart** | [type-org-chart.md](references/type-org-chart.md) |
| Stacked abstraction levels | **Layer stack** | [type-layers.md](references/type-layers.md) |
| Parts of one object pulled apart along one axis: a teardown, an unboxing, assembly order | **Exploded axonometric** | [type-exploded.md](references/type-exploded.md) |
| One floor or site seen from above at an angle: rooms with furniture, buildings by phase | **Axonometric plan** | [type-axonometric-plan.md](references/type-axonometric-plan.md) |
| Overlap between sets | **Venn** | [type-venn.md](references/type-venn.md) |
| Ranked hierarchy or conversion drop-off | **Pyramid / funnel** | [type-pyramid.md](references/type-pyramid.md) |
| Quantitative comparison across categories | **Bar chart** | [type-bar.md](references/type-bar.md) |
| A start total bridged to an end total by signed contributions (budget bridge, headcount deltas) | **Waterfall** | [type-waterfall.md](references/type-waterfall.md) |
| Part-of-whole where the relative sizes are the story | **Treemap** | [type-treemap.md](references/type-treemap.md) |
| Cross-tabulated data; fill encodes value per cell | **Heatmap** | [type-heatmap.md](references/type-heatmap.md) |
| Continuous trends over time, change between exactly two states (slopegraph), one distribution per series (ridgeline), or rank movement across several snapshots (bump) | **Line chart** | [type-line.md](references/type-line.md) |
| Tasks and phases on a timeline | **Gantt** | [type-gantt.md](references/type-gantt.md) |
| Correlation or distribution of two variables; bubble (three variables) and beeswarm (one variable, dot per item) variants | **Scatter plot** | [type-scatter.md](references/type-scatter.md) |
| End-to-end data stack on a container cluster | **High-Level** | [type-high-level.md](references/type-high-level.md) |
| Multi-actor sequential process with data handoffs | **Process** | [type-process.md](references/type-process.md) |
| Multi-tier data storage with quality levels and access policies | **Medallion** | [type-medallion.md](references/type-medallion.md) |
| Role-scoped data flow: who does what at each pipeline step | **Data flow** | [type-data-flow.md](references/type-data-flow.md) |
| Integration topology of a data platform — sources → core → consumers | **DP integration** | [type-dp-integration.md](references/type-dp-integration.md) |
| Per-role / per-component access permissions matrix | **DP security matrix** | [type-dp-security-matrix.md](references/type-dp-security-matrix.md) |
| A quantity splitting and merging across stages, band width = amount | **Sankey** | [type-sankey.md](references/type-sankey.md) |
| Causes of one observed effect, grouped by category (root-cause analysis) | **Fishbone** | [type-fishbone.md](references/type-fishbone.md) |
| Value chain against evolution — what to build, buy, and what is moving | **Wardley map** | [type-wardley.md](references/type-wardley.md) |
| Work-in-progress by state, with WIP limits and blocked items | **Kanban** | [type-kanban.md](references/type-kanban.md) |
| What a person does across stages of an experience, and how it feels | **User journey** | [type-journey.md](references/type-journey.md) |
| What the customer does vs what the service hides, across stages, with a line of visibility | **Service blueprint** | [type-service-blueprint.md](references/type-service-blueprint.md) |
| Where software runs — zones, hosts, artifacts, replicas, ports | **Deployment** | [type-deployment.md](references/type-deployment.md) |

From angeldelbiondo/claude-config, MIT.

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