ADR Graph-Easy Architect

Create comprehensive ASCII architecture diagrams for Architecture Decision Records (ADRs) using graph-easy. Pure text output with automatic layout - no image rendering required.

When to Use This Skill

• Writing new ADR that involves architectural changes
• ADR describes migration, integration, or system changes
• User asks for visual representation of a decision
• Existing ADR diagram needs review or update

Preflight Check

Run these checks in order. Each layer depends on the previous.

Layer 1: Package Manager

/usr/bin/env bash << 'SETUP_EOF'
# Detect OS and set package manager
case "$(uname -s)" in
  Darwin) PM="brew" ;;
  Linux)  PM="apt" ;;
  *)      echo "ERROR: Unsupported OS (require macOS or Linux)"; exit 1 ;;
esac
command -v $PM &>/dev/null || { echo "ERROR: $PM not installed"; exit 1; }
echo "✓ Package manager: $PM"
SETUP_EOF

Layer 2: Perl + cpanminus (mise-first approach)

# Prefer mise for unified tool management
if command -v mise &>/dev/null; then
  # Install Perl via mise
  mise which perl &>/dev/null || mise install perl
  # Install cpanminus under mise perl
  mise exec perl -- cpanm --version &>/dev/null 2>&1 || {
    echo "Installing cpanminus under mise perl..."
    mise exec perl -- curl -L https://cpanmin.us | mise exec perl -- perl - App::cpanminus
  }
  echo "✓ cpanminus installed (via mise perl)"
else
  # Fallback: Install cpanminus via system package manager
  command -v cpanm &>/dev/null || {
    echo "Installing cpanminus via $PM..."
    case "$PM" in
      brew) brew install cpanminus ;;
      apt)  sudo apt install -y cpanminus ;;
    esac
  }
  echo "✓ cpanminus installed"
fi

Layer 3: Graph::Easy Perl module

# Check if Graph::Easy is installed (mise-first)
if command -v mise &>/dev/null; then
  mise exec perl -- perl -MGraph::Easy -e1 2>/dev/null || {
    echo "Installing Graph::Easy via mise perl cpanm..."
    mise exec perl -- cpanm Graph::Easy
  }
  echo "✓ Graph::Easy installed (via mise perl)"
else
  perl -MGraph::Easy -e1 2>/dev/null || {
    echo "Installing Graph::Easy via cpanm..."
    cpanm Graph::Easy
  }
  echo "✓ Graph::Easy installed"
fi

Layer 4: Verify graph-easy is in PATH

# Verify graph-easy is accessible and functional
command -v graph-easy &>/dev/null || {
  echo "ERROR: graph-easy not found in PATH"
  exit 1
}
# Test actual functionality (--version exits with code 2, unreliable)
echo "[Test] -> [OK]" | graph-easy &>/dev/null && echo "✓ graph-easy ready"

All-in-One Preflight Script

/usr/bin/env bash << 'PREFLIGHT_EOF'
# Copy-paste this entire block to ensure graph-easy is ready (macOS + Linux)
# Prefers mise for unified cross-platform tool management

# Check for mise first (recommended)
if command -v mise &>/dev/null; then
  echo "Using mise for Perl management..."
  mise which perl &>/dev/null || mise install perl
  mise exec perl -- cpanm --version &>/dev/null 2>&1 || \
    mise exec perl -- curl -L https://cpanmin.us | mise exec perl -- perl - App::cpanminus
  mise exec perl -- perl -MGraph::Easy -e1 2>/dev/null || mise exec perl -- cpanm Graph::Easy
else
  # Fallback: system package manager
  echo "💡 Tip: Install mise for unified tool management: curl https://mise.run | sh"
  case "$(uname -s)" in
    Darwin) PM="brew" ;;
    Linux)  PM="apt" ;;
    *)      echo "ERROR: Unsupported OS"; exit 1 ;;
  esac
  command -v $PM &>/dev/null || { echo "ERROR: $PM not installed"; exit 1; }
  command -v cpanm &>/dev/null || { [ "$PM" = "apt" ] && sudo apt install -y cpanminus || brew install cpanminus; }
  perl -MGraph::Easy -e1 2>/dev/null || cpanm Graph::Easy
fi

# Verify graph-easy is in PATH and functional
command -v graph-easy &>/dev/null || {
  echo "ERROR: graph-easy not in PATH after installation"
  exit 1
}
# Test actual functionality (--version exits with code 2, unreliable)
echo "[Test] -> [OK]" | graph-easy &>/dev/null && echo "✓ graph-easy ready"
PREFLIGHT_EOF

---

Part 1: DSL Syntax

Basic Elements

# Nodes (square brackets)
[Node Name]

# Edges (arrows)
[A] -> [B]

# Labeled edges
[A] -- label --> [B]

# Bidirectional
[A] <-> [B]

# Chain
[A] -> [B] -> [C]

Groups (Containers)

# Named group with dashed border
( Group Name:
  [Node A]
  [Node B]
)

# Nested connections
( Before:
  [Old System]
)
( After:
  [New System]
)
[Before] -> [After]

Node Labels

# Custom label (different from ID)
[db] { label: "PostgreSQL Database"; }

# ASCII markers for visual distinction INSIDE boxes
# (emojis break box alignment - use ASCII markers instead)
[deleted] { label: "[x] Old Component"; }
[added] { label: "[+] New Component"; }
[warning] { label: "[!] Deprecated"; }
[success] { label: "[OK] Passed"; }

Character rules for nodes:

• Graphical emojis (🚀 💡 ✅ ❌) - NEVER (double-width breaks box alignment)
• Unicode symbols (✓ ✗ ⚠ → ←) - OK (single-width, safe)
• ASCII markers ([x] [+] [!] :) ) - ALWAYS safe (monospace)

Use graph { label: "..."; } for graphical emojis in title/legend.

Example: Emoji breaks alignment (DON'T DO THIS)

# BAD - emoji inside node
[rocket] { label: "🚀 Launch"; }

Renders broken:

┌────────────┐
│ 🚀 Launch  │   <-- box edge misaligned due to double-width emoji
└────────────┘

Example: ASCII marker preserves alignment (DO THIS)

# GOOD - ASCII marker inside node
[rocket] { label: "[>] Launch"; }

Renders correctly:

┌────────────┐
│ [>] Launch │
└────────────┘

Example: Emoji safe in graph title (OK)

# OK - emoji in graph label (outside boxes)
graph { label: "🚀 Deployment Pipeline"; flow: east; }
[Build] -> [Test] -> [Deploy]

Renders correctly (emoji in title, not in boxes):

        🚀 Deployment Pipeline

┌───────┐     ┌──────┐     ┌────────┐
│ Build │ --> │ Test │ --> │ Deploy │
└───────┘     └──────┘     └────────┘

Flow Direction (MANDATORY: Always specify)

# MANDATORY: Always specify flow direction explicitly
graph { flow: south; }   # Top-to-bottom (architecture, decisions)
graph { flow: east; }    # Left-to-right (pipelines, sequences)

Never rely on default flow - explicit is clearer.

Graph Title and Legend (Outside Boxes - Emojis Safe Here)

Emojis break alignment INSIDE boxes but are SAFE in graph titles/legends.

Emoji Selection Guide - Choose emoji that matches diagram purpose:

Diagram Type	Emoji	Example Title
Migration/Change	🔄	"🔄 Database Migration"
Deployment/Release	🚀	"🚀 Deployment Pipeline"
Data Flow	📊	"📊 Data Ingestion Flow"
Security/Auth	🔐	"🔐 Authentication Flow"
Error/Failure	⚠️	"⚠️ Error Handling"
Decision/Branch	🔀	"🔀 Routing Decision"
Architecture	🏗️	"🏗️ System Architecture"
Network/API	🌐	"🌐 API Integration"
Storage/Database	💾	"💾 Storage Layer"
Monitoring/Observability	📡	"📡 Monitoring Stack"
Hook/Event	🪝	"🪝 Hook Flow"
Before/After comparison	⏮️/⏭️	"⏮️ Before" / "⏭️ After"

# Title with semantic emoji
graph { label: "🚀 Deployment Pipeline"; flow: east; }

# Title with legend (multiline using \n)
graph { label: "🪝 Hook Flow\n──────────\n✓ Allow  ✗ Deny  ⚠ Warn"; flow: south; }

Rendered:

Hook Flow
 ──────────
✓ Allow ✗ Deny ⚠ Warn

   ╭───────╮
   │ Start │
   ╰───────╯

Rule: Emojis ONLY in graph { label: "..."; } - NEVER inside [ node ]

Node Styling (Best Practices)

# Rounded corners for start/end nodes
[ Start ] { shape: rounded; }
[ End ] { shape: rounded; }

# Double border for emphasis
[ Critical Step ] { border: double; }

# Bold border for important nodes
[ Key Decision ] { border: bold; }

# Dotted border for optional/skippable
[ Optional ] { border: dotted; }

# Multiline labels with \n
[ Hook Input\n(stdin JSON) ]

Rendered examples:

╭─────────╮              ┌─────────┐
│ Rounded │              │ Default │
╰─────────╯              └─────────┘

╔═════════╗              ┏━━━━━━━━━┓
║ Double  ║              ┃  Bold   ┃
╚═════════╝              ┗━━━━━━━━━┛

Note: Dotted borders ({ border: dotted; }) use ⋮ characters that render inconsistently on GitHub. Use sparingly.

Edge Styles

[ A ] -> [ B ]      # Solid arrow (default)
[ A ] ..> [ B ]     # Dotted arrow
[ A ] ==> [ B ]     # Bold/double arrow
[ A ] - -> [ B ]    # Dashed arrow
[ A ] -- label --> [ B ]  # Labeled edge

---

Part 2: Common Diagram Patterns

Migration (Before → After)

graph { flow: south; }
[Before] -- migrate --> [After]

Multi-Component System

graph { flow: south; }
[A] -> [B] -> [C]
[B] -> [D]

Pipeline (Left-to-Right)

graph { flow: east; }
[Input] -> [Process] -> [Output]

Decision with Options

graph { flow: south; }
[Decision] -> [Option A]
[Decision] -> [Option B]

Grouped Components

( Group:
  [Component 1]
  [Component 2]
)
[External] -> [Component 1]

Bidirectional Flow

[Client] <-> [Server]
[Server] -> [Database]

---

Part 3: Rendering

Command (MANDATORY: Always use boxart)

# MANDATORY: Always use --as=boxart for clean output
graph-easy --as=boxart << 'EOF'
graph { flow: south; }
[A] -> [B] -> [C]
EOF

Never use --as=ascii - it produces ugly +--+ boxes instead of clean ┌──┐ lines.

Output Modes

Mode	Command	Usage
boxart	--as=boxart	MANDATORY - clean Unicode lines
ascii	--as=ascii	NEVER USE - ugly output, legacy only

Validation Workflow

# 1. Write DSL to heredoc
# 2. Render with boxart
graph-easy --as=boxart << 'EOF'
[Your] -> [Diagram] -> [Here]
EOF

# 3. Review output
# 4. Iterate if needed
# 5. Copy final ASCII to ADR

---

Part 4: Embedding in ADR

Markdown Format (MANDATORY: Always Include Source)

CRITICAL: Every rendered diagram MUST be followed by a collapsible <details> block containing the graph-easy source code. This is non-negotiable for:

• Reproducibility: Future maintainers can regenerate the diagram
• Editability: Source can be modified and re-rendered
• Auditability: Changes to diagrams are trackable in git diffs

## Architecture

```
┌──────────┐     ┌──────────┐     ┌──────────┐
│  Before  │ ──> │  After   │ ──> │ Database │
└──────────┘     └──────────┘     └──────────┘
```

<details>
<summary>graph-easy source</summary>

```
graph { flow: east; }
[Before] -> [After] -> [Database]
```

</details>

The <details> block is MANDATORY - never embed a diagram without its source.

GFM Collapsible Section Syntax

GitHub Flavored Markdown supports HTML <details> and <summary> tags for collapsible sections. Key syntax rules:

Structure:

<details>
  <summary>Click to expand</summary>

  <!-- BLANK LINE REQUIRED HERE -->
  Content goes here (Markdown supported)
  <!-- BLANK LINE REQUIRED HERE -->
</details>

Critical rules:

1. Blank lines required - Must have empty line after <summary> and before </details> for Markdown to render
2. No indentation - <details> and <summary> must be at column 0 (no leading spaces)
3. Summary is clickable label - Text in <summary> appears as the collapsed header
4. Markdown inside works - Code blocks, headers, lists all render correctly inside

Optional: Default expanded:

<details open>
  <summary>Expanded by default</summary>

  Content visible on page load
</details>

Common mistake (Markdown won't render):

<details>
  <summary>Broken</summary>
  No blank line - this won't render as Markdown!
</details>

References:

• GitHub Docs: Collapsed sections
• GFM details/summary gist

File Organization

No separate asset files needed - diagram is inline in the markdown.

Regeneration

If ADR changes, regenerate by running the source through graph-easy again:

# Extract source from <details> block, pipe through graph-easy
graph-easy --as=boxart << 'EOF'
# paste source here
EOF

---

Reference: Monospace-Safe Symbols

Avoid emojis - they have variable width and break box alignment on GitHub.

Status Markers

Meaning	Marker
Added/New	[+]
Removed/Deleted	[x]
Changed/Updated	[*]
Warning/Deprecated	[!]
Deferred/Pending	[~]
Current/Active	[>]
Optional	[?]
Locked/Fixed	[=]

Box Drawing (U+2500-257F)

─ │ ┌ ┐ └ ┘ ├ ┤ ┬ ┴ ┼   (light)
═ ║ ╔ ╗ ╚ ╝ ╠ ╣ ╦ ╩ ╬   (double)

Arrows & Pointers

→ ← ↑ ↓              (arrows)
∨ ∧                  (logic - graph-easy uses these)
< > ^ v              (ASCII arrows)

Shapes & Bullets

• ○ ●                (bullets)
□ ■                  (squares)
◇ ◆                  (diamonds)

Math & Logic

× ÷ ± ≠ ≤ ≥ ∞       (math)
∧ ∨ ¬                (logic)

Reference: Common Patterns

# Vertical flow (architecture)
graph { flow: south; }

# Horizontal flow (pipeline)
graph { flow: east; }

# Labeled edge
[A] -- label text --> [B]

# Group with border
( Group Name:
  [Node A]
  [Node B]
)

# Custom node label
[id] { label: "Display Name"; }

---

Graph Label (MANDATORY: EVERY diagram MUST have emoji + title)

WARNING: This is the most commonly forgotten requirement. Diagrams without labels are invalid.

Correct Example

graph { label: "🔄 Database Migration"; flow: south; }
[Old DB] -> [New DB]

Anti-Pattern (INVALID - DO NOT DO THIS)

graph { flow: south; }
[Old DB] -> [New DB]

Why this is wrong: Missing label: with emoji. The preflight validator will BLOCK any ADR containing diagrams without graph { label: "emoji ..."; }.

---

Mandatory Checklist (Before Rendering)

Graph-Level (MUST have)

• graph { label: "🚀 Title"; } - semantic emoji + title (MOST FORGOTTEN - check first!)
• graph { flow: south; } or graph { flow: east; } - explicit direction
• Command uses --as=boxart - NEVER --as=ascii

Embedding (MUST have - non-negotiable)

• <details> block with source - EVERY diagram MUST have collapsible source code block
• Format: rendered diagram in ``` block, followed immediately by <details><summary>graph-easy source</summary> with source in ``` block
• Never commit a diagram without its reproducible source

Node Styling (Visual hierarchy)

• Start/end nodes: { shape: rounded; } - entry/exit points
• Critical/important nodes: { border: double; } or { border: bold; }
• Optional/skippable nodes: { border: dotted; }
• Default nodes: no styling (standard ┌──┐ border)
• Long labels use \n for multiline - max ~15 chars per line

Edge Styling (Semantic meaning)

• Main/happy path: -> solid arrow
• Conditional/alternate: ..> dotted arrow
• Emphasized/critical: ==> bold arrow
• Edge labels are SHORT (1-3 words): -- YES -->, -- error -->

Character Safety (Alignment)

• NO graphical emojis inside nodes (🚀 💡 ✅ ❌ break alignment)
• Unicode symbols OK inside nodes (✓ ✗ ⚠ are single-width)
• ASCII markers ALWAYS safe ([x] [+] [!] [OK])
• Graphical emojis ONLY in graph { label: "..."; } title

Structure (Organization)

• Groups ( Name: ... ) used for logical clustering when 4+ related nodes
• Node IDs short, labels descriptive: [db] { label: "PostgreSQL"; }
• No more than 7-10 nodes per diagram (split if larger)

Success Criteria

Correctness

1. Parses without error - graph-easy accepts the DSL
2. Renders cleanly - no misaligned boxes or broken lines
3. Matches content - all key elements from description represented
4. Source preserved (MANDATORY) - EVERY diagram MUST have <details> block with graph-easy DSL source immediately after the rendered output

Aesthetics

5. Uses boxart - clean Unicode lines ┌──┐, not ASCII +--+
6. Visual hierarchy - start/end rounded, important bold/double, optional dotted
7. Consistent styling - same border style = same semantic meaning throughout
8. Readable labels - multiline with \n, no truncation
9. Clear flow - direction matches natural reading (top-down or left-right)

Comprehensiveness

10. Semantic emoji in title - emoji consciously chosen to match diagram purpose (see Emoji Selection Guide)
11. Legend if needed - multiline title with \n for complex diagrams
12. Edge semantics - solid=normal, dotted=conditional, bold=critical
13. Logical grouping - related nodes in ( Group: ... ) containers

Troubleshooting

Issue	Cause	Solution
command not found	graph-easy not installed	Run preflight check
Misaligned boxes	Used --as=ascii	Always use --as=boxart
Box border broken	Graphical emoji in node	Remove 🚀💡, use ✓✗ or [x][+]
Nodes overlap	Too complex	Split into multiple diagrams (max 7-10 nodes)
Edge labels cut off	Label too long	Shorten to 1-3 words
No title showing	Wrong syntax	Use graph { label: "Title"; flow: south; }
Weird layout	No flow direction	Add graph { flow: south; } or flow: east
Parse error	Special chars in node	Escape or simplify node names

Resources

• Graph::Easy on CPAN
• Graph::Easy Manual
• Graph::Easy GitHub