D2 Validate

/d2-validate

User request: "$ARGUMENTS"

Task

Validate D2 syntax in .d2 files or .md files containing D2 code blocks.

Process

Step 1: Resolve Plugin Path

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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: Ensure D2 is installed

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bash "$PLUGIN_DIR/scripts/ensure-deps.sh"

Step 3: Determine Input

From $ARGUMENTS:

• .d2 file → validate directly
• .md file → extract D2 blocks first with extract_d2.sh, then validate each
• Directory → find all .d2 files and .md files with D2 blocks
• No argument → ask: "Which file or directory should I validate?"

Step 4: Collect Files to Validate

For .d2 files:

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# Validate directly
d2 validate {file.d2}

For .md files:

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# Extract D2 blocks to temp files
bash "$PLUGIN_DIR/scripts/extract_d2.sh" {file.md}
# Then validate each extracted temp file
d2 validate {temp_file}

For directories:

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# Find all .d2 files
find {dir} -name "*.d2" -not -path "*/node_modules/*" -not -path "*/.git/*"

# Find .md files containing d2 blocks
grep -rl '```d2' {dir} --include="*.md" 2>/dev/null

Step 5: Validate Each File

For each file:

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d2 validate {file} 2>&1
# Exit 0 = valid, non-zero = error

Track: filename, pass/fail, error message (if any).

Step 6: Report Results

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Validated {N} diagrams:

  ✅ diagrams/architecture-services-20260310.d2
  ✅ diagrams/sequence-auth-flow-20260310.d2
  ❌ docs/design.md (block 2) — unexpected token at line 14: missing closing brace

If any failures:

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{N} validation error(s) found.
See $PLUGIN_DIR/references/guides/troubleshooting.md for fixes.

If all pass:

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All {N} diagrams valid ✅

Output Summary Format

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D2 Validation Summary
─────────────────────
Path: {input_path}
Files checked: {N}
Passed: {N}    Failed: {N}

{per-file results}

{troubleshooting hint if any failures}