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Diagramming Expert

  • 158 installs
  • 178 repo stars
  • Updated July 14, 2026
  • erichowens/some_claude_skills

Produce architecture, sequence, and ER diagrams that explain flows for RFCs, onboarding, and stakeholder reviews.

About

Helps author clear technical diagrams—architecture, sequences, ERDs, and deployment views—with consistent notation and mermaid-friendly output for docs, RFCs, and team onboarding.

  • C4 and sequence diagrams
  • Mermaid syntax help
  • Data flow clarity
  • Consistent notation
  • Review-ready layouts

Diagramming Expert by the numbers

  • 158 all-time installs (skills.sh)
  • Ranked #558 of 1,879 Documentation skills by installs in the Skillselion catalog
  • Data as of Aug 4, 2026 (Skillselion catalog sync)
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Listed on Skillselion
Installs158
repo stars178
Last updatedJuly 14, 2026
Repositoryerichowens/some_claude_skills

What it does

Produce architecture, sequence, and ER diagrams that explain flows for RFCs, onboarding, and stakeholder reviews.

Files

SKILL.mdMarkdownGitHub ↗

Diagramming Expert

Master of text-based visual communication. Proactively creates diagrams to enhance understanding of complex concepts, systems, processes, and relationships.

Core Philosophy

"Above all else, show the data." — Edward Tufte

Diagrams should: 1. Reduce cognitive load — not add to it 2. Maximize signal — minimize noise (data-ink ratio) 3. Be maintainable — easy to update as understanding evolves 4. Work everywhere — monospace text renders universally

When to Use This Skill

Use for:

  • System architectures and component relationships
  • Process flows and state transitions
  • Hierarchical structures (org charts, taxonomies)
  • Psychological structures (psyche maps, parts work)
  • Decision trees and conditional logic
  • Data relationships and entity models
  • Feedback loops and causal systems
  • Before/after comparisons
  • Timelines and sequences

NOT for:

  • Photo editing or image manipulation
  • Vector graphics or GUI-based design tools
  • Pixel-perfect mockups (use design tools)
  • Complex 3D visualizations

Ask yourself: "Would this be clearer with a picture?" If yes → diagram it.

Diagram Types Reference

See /references/diagram-types.md for complete taxonomy

Quick Reference

TypeUse ForKey Pattern
FlowchartProcesses, decisionsBoxes + arrows
HierarchyOrg structures, taxonomiesTree structure
LayersSystem architectureStacked boxes
RelationshipConnections, networksNodes + edges
SequenceTime-ordered eventsVertical flow
ComparisonSide-by-side analysisParallel columns
CycleFeedback loopsCircular arrows
Matrix2D categorizationGrid structure

Character Reference

See /references/unicode-characters.md for complete character set

Essential Characters

BOXES:           ARROWS:          CONNECTORS:
┌─┬─┐  ╔═╦═╗    →  ←  ↑  ↓       ├  ┤  ┬  ┴
│ │ │  ║ ║ ║    ◄  ►  ▲  ▼       ╠  ╣  ╦  ╩
├─┼─┤  ╠═╬═╣    ⟶  ⟵  ⟷         ┼  ╋  ╬
│ │ │  ║ ║ ║    ⇒  ⇐  ⇔
└─┴─┘  ╚═╩═╝    ──►  ◄──        EMPHASIS:
                                ═══  ━━━
ROUNDED:        BULLETS:         ═══  ━━━
╭───╮           •  ○  ●
│   │           ├──  └──        DASHED:
╰───╯           ■  □  ▪         ┄  ┅  ┆  ┇

Design Principles

1. Tufte's Data-Ink Ratio

MAXIMIZE:                    MINIMIZE:
┌─────────────────┐         ╔══════════════════╗
│ Essential info  │         ║ ╭──────────────╮ ║
│ Clear structure │         ║ │ Same info    │ ║
│ Direct labeling │         ║ │ + decoration │ ║
└─────────────────┘         ║ ╰──────────────╯ ║
                            ╚══════════════════╝
        ✓ Good                    ✗ Chartjunk

2. Cognitive Load Management

CHUNKING: Group related elements

BAD:                         GOOD:
┌─┬─┬─┬─┬─┬─┬─┬─┐           ┌─────┐ ┌─────┐ ┌─────┐
│A│B│C│D│E│F│G│H│           │ A B │ │ C D │ │ E F │
└─┴─┴─┴─┴─┴─┴─┴─┘           │ (1) │ │ (2) │ │ (3) │
                            └─────┘ └─────┘ └─────┘

3. Gestalt Principles

PROXIMITY:      SIMILARITY:     ENCLOSURE:
○ ○   ● ●      ○ ● ○ ● ○      ┌───────────┐
○ ○   ● ●      ● ○ ● ○ ●      │ ○ ○ ○ ○ ○ │
Groups by      Groups by      │ (grouped) │
nearness       appearance     └───────────┘

4. Visual Hierarchy

EMPHASIS LEVELS:

═══════════════════════    Level 1: Double/Heavy
───────────────────────    Level 2: Single
- - - - - - - - - - - -    Level 3: Dashed
. . . . . . . . . . . .    Level 4: Dotted

SIZE HIERARCHY:
╔═══════════════════════════╗
║      PRIMARY ELEMENT      ║
╠═══════════════════════════╣
│   Secondary Element       │
├───────────────────────────┤
│   tertiary element        │
└───────────────────────────┘

Common Patterns

See /references/patterns-library.md for comprehensive patterns

Process Flow

┌─────────┐    ┌─────────┐    ┌─────────┐
│  Start  │───►│ Process │───►│   End   │
└─────────┘    └─────────┘    └─────────┘

Decision Tree

                ┌──────────┐
                │ Decision │
                └────┬─────┘
           ┌─────────┴────────┐
           ▼                  ▼
      ┌────────┐         ┌────────┐
      │  Yes   │         │   No   │
      └────────┘         └────────┘

Layered Architecture

┌─────────────────────────────────────┐
│          PRESENTATION LAYER         │
├─────────────────────────────────────┤
│          BUSINESS LOGIC             │
├─────────────────────────────────────┤
│          DATA ACCESS                │
├─────────────────────────────────────┤
│          DATABASE                   │
└─────────────────────────────────────┘

Feedback Loop

        ┌──────────────────┐
        │                  │
        ▼                  │
    ┌───────┐          ┌───┴───┐
    │ Input │─────────►│Output │
    └───────┘          └───────┘
        ▲                  │
        │                  │
        └──────────────────┘

Anti-Patterns

Chartjunk

✗ BAD: Excessive decoration
╔══════════════════════════════════╗
║ ╭━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╮ ║
║ ┃ ★ ★ ★  IMPORTANT INFO  ★ ★ ★ ┃ ║
║ ╰━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╯ ║
╚══════════════════════════════════╝

✓ GOOD: Clean and direct
┌──────────────────┐
│  Important Info  │
└──────────────────┘

Spaghetti Arrows

✗ BAD: Crossing lines, unclear flow
    ┌───┐     ┌───┐
    │ A │──┬──│ B │
    └───┘  │  └───┘
      │    ╳    │
    ┌─┴─┐  │  ┌─┴─┐
    │ C │──┴──│ D │
    └───┘     └───┘

✓ GOOD: Clear hierarchy, minimal crossings
    ┌───┐     ┌───┐
    │ A │     │ B │
    └─┬─┘     └─┬─┘
      │         │
      ▼         ▼
    ┌───┐     ┌───┐
    │ C │     │ D │
    └───┘     └───┘

Information Overload

✗ BAD: Too much in one diagram
[Cramming 15 concepts with 30 arrows]

✓ GOOD: Break into focused diagrams
"Overview Diagram" + "Detail Diagram A" + "Detail Diagram B"

Skill Integrations

Works with:

  • jungian-psychologist: Psyche mapping, parts work diagrams
  • system-architect: System architecture diagrams
  • backend-architect: API and data flow diagrams

Jungian Psychology Diagrams

See /references/jungian-diagrams.md for psychology-specific patterns

This skill integrates closely with jungian-psychologist for:

  • Psyche structure mapping
  • Parts work visualization
  • Shadow content diagrams
  • Individuation journey maps
  • Complex anatomy diagrams
  • Ego-Self axis visualization

Mermaid Integration

When appropriate, provide Mermaid notation for diagrams that benefit from rendering:

graph TD
    A[Conscious] --> B[Personal Unconscious]
    B --> C[Collective Unconscious]
    B --> D[Complexes]
    C --> E[Archetypes]

Workflow

1. Understand the content — What are we visualizing? 2. Choose the right type — Hierarchy? Process? Relationship? 3. Sketch the structure — Start rough, refine 4. Apply principles — Data-ink ratio, chunking, hierarchy 5. Test readability — Would someone new understand this? 6. Iterate — Diagrams improve with revision

---

Remember: A good diagram is worth a thousand words. Create them proactively whenever complex concepts arise.

Related skills

Documentationdocsintegrations

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