{
  "id": "expr-002",
  "skills": ["n8n-expression-syntax"],
  "query": "My webhook workflow is showing {{$json.name}} as undefined even though I'm sending {\"name\": \"John\"} in the webhook POST request. What am I doing wrong?",
  "expected_behavior": [
    "Identifies that webhook data is nested under .body property",
    "Explains the webhook node output structure",
    "Provides the corrected expression: {{$json.body.name}}",
    "Shows the complete webhook data structure with headers, params, query, and body",
    "Emphasizes this is a CRITICAL gotcha specific to webhook nodes"
  ],
  "baseline_without_skill": {
    "likely_response": "May suggest debugging or checking data format, unlikely to know webhook-specific structure",
    "expected_quality": "Low - would miss the webhook .body nesting"
  },
  "with_skill_expected": {
    "response_quality": "High - identifies webhook-specific issue immediately",
    "uses_skill_content": true,
    "provides_correct_syntax": true,
    "explains_webhook_structure": true,
    "warns_about_common_gotcha": true
  }
}