d2-config

name	d2-config
description	Change theme, layout engine, sketch mode, or check plugin dependencies
argument-hint	["setting value"]
allowed-tools	Read, Bash, Write

/d2-config

User request: "$ARGUMENTS"

Task

Interactive config wizard: view and update D2 plugin settings, or run a dependency health check.

Config file

All settings are stored in .claude/d2.json in the current project directory.

Default values (used when file does not exist):

{
  "theme_id": 0,
  "layout": "dagre",
  "sketch": false,
  "output_directory": "./diagrams",
  "auto_validate": true,
  "auto_render": false,
  "output_format": "svg"
}

Process

Step 1: Resolve Plugin Path

PLUGIN_DIR=$(find "$HOME/.claude/plugins/cache" -type d -name "d2" -path "*/skills/d2" 2>/dev/null | head -1)
[ -z "$PLUGIN_DIR" ] && PLUGIN_DIR=$(find "$HOME" -maxdepth 8 -type d -name "d2" -path "*/skills/d2" 2>/dev/null | head -1)

Step 2: Read current config

If .claude/d2.json exists, read it. Otherwise use defaults above.

Step 3: If argument provided

If the user passed arguments (e.g. theme_id 200 or layout elk), apply directly:

• Parse as {setting} {value}
• Validate value is allowed (see options below)
• Update .claude/d2.json
• Confirm: "✅ {setting} set to {value}"
• Done.

Step 4: If no argument — show interactive menu

Display:

Current config (.claude/d2.json):

  1. theme_id           → {current}   (D2 theme ID — see list below)
  2. layout             → {current}   (dagre | elk | tala)
  3. sketch             → {current}   (true | false — hand-drawn style)
  4. output_directory   → {current}
  5. auto_validate      → {current}   (true | false)
  6. auto_render        → {current}   (true | false)
  7. output_format      → {current}   (svg | png)
  8. Run health check

What would you like to change? (enter 1-8)

Step 5: Handle selection

If 1 (theme_id):

Available D2 themes:

  Light/Neutral:
    0 — Neutral             clean, minimal, default
    3 — Terrastruct         official D2 theme, polished
    4 — Cool Classics       muted blues and greens
    5 — Mixed Berry Blue    vibrant blue tones
    8 — Colorblind Clear    accessible palette

  Warm/Accent:
  100 — Vanilla Nitro Cola  warm cream/caramel
  101 — Orange Creamsicle   orange and cream

  Dark:
    1 — Neutral Dark        inverted neutral
  200 — Dark Mauve          dark purple tones

  Terminal:
  300 — Terminal            monochrome terminal
  301 — Terminal Grayscale  grayscale terminal

Enter theme ID (e.g. 0, 200, 300):

Update theme_id in .claude/d2.json.

If 2 (layout engine):

Available layout engines:

  dagre — fast, simple directed graphs (default, always available)
  elk   — complex diagrams, better spacing for many nodes (always available)
  tala  — multi-directional nested layouts (requires: brew install tala)

Enter: dagre | elk | tala

Update layout in .claude/d2.json.

If 3 (sketch): Toggle true/false. Update config.

Note: sketch mode is NOT compatible with ER diagrams (sql_table shapes). The d2-er specialist always overrides this to false.

If 4 (output_directory): Ask for path. Update config.

Special values:

• "same" — save output in the same directory as the input file. Falls back to ./diagrams when there is no input file reference.

If 5 (auto_validate): Toggle true/false. Update config.

If 6 (auto_render): Toggle true/false. Update config.

Note: PNG rendering requires Playwright. If auto_render is enabled and output_format is png, run a health check to verify Playwright is available.

If 7 (output_format):

Available formats:
  svg — vector, works everywhere Git renders Markdown (recommended)
  png — raster image, requires Playwright headless browser

Enter: svg | png

Update output_format in .claude/d2.json.

If 8 (health check): See Health Check section below.

Step 6: Write updated config

Create .claude/ directory if it doesn't exist:

mkdir -p .claude

Write updated settings to .claude/d2.json (merge with existing, don't overwrite unrelated keys).

Confirm: "✅ Config saved to .claude/d2.json"

---

Health Check

Run when user selects option 8.

Check 1: d2 binary

which d2 && d2 --version 2>&1

✅ if found and prints version | ❌ if not found → show install instructions:

Install d2:
  macOS:   brew install d2
  Go:      go install oss.terrastruct.com/d2@latest
  Script:  curl -fsSL https://d2lang.com/install.sh | sh -s --

Check 2: Render smoke test

printf 'vars: { d2-config: { theme-id: 0 } }\na -> b: hello' > /tmp/d2-health-check.d2
d2 /tmp/d2-health-check.d2 /tmp/d2-health-check.svg 2>&1

✅ if exit 0 and /tmp/d2-health-check.svg contains <svg | ❌ if error → show the error message

Check 3: PNG support (only if output_format is "png")

d2 /tmp/d2-health-check.d2 /tmp/d2-health-check.png 2>&1

✅ if exit 0 | ❌ if error about Playwright → "PNG requires Playwright: npm install -g playwright && playwright install chromium"

Output format

D2 plugin — dependency check

  ✅ d2 v0.6.x             installed
  ✅ Render smoke test      SVG generated OK
  ✅ PNG support            Playwright available

Features:
  ✅ Generate diagrams    ✅ Validate    ✅ Render SVG    ✅ Render PNG