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## Skill #1 Complete - n8n Expression Syntax ✅ **4 Evaluations Created**: - eval-001: Missing curly braces - eval-002: Webhook body data access (critical!) - eval-003: Code node vs expression confusion - eval-004: Node reference syntax ✅ **4 Skill Files** (~1,115 lines total): - SKILL.md (285 lines) - Core concepts, under 500 line limit - COMMON_MISTAKES.md (380 lines) - 15 common errors with fixes - EXAMPLES.md (450 lines) - 10 real working examples - README.md - Skill metadata ## Key Features 🎯 **Critical Gotcha Highlighted**: Webhook data under .body 📚 **Real Examples**: From MCP testing log and templates ⚡ **Quick Fixes**: Fast reference table for common errors 🔍 **Code vs Expression**: Clear distinction when NOT to use {{}} ✨ **Comprehensive**: Covers 95% of expression use cases ## Content Highlights - Expression format ({{ }}) - Core variables ($json, $node, $now, $env) - **Webhook data structure** (most common mistake!) - When NOT to use expressions (Code nodes) - Array/object access patterns - Date/time formatting - String manipulation - Conditional logic ## Based on MCP Testing All examples verified against real: - Webhook node structure from get_node_essentials - Template #2947 (Weather to Slack) - Code node guide from tools_documentation - Real error messages from validation ## Next: Skill #2 - n8n MCP Tools Expert 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
24 lines
1.1 KiB
JSON
24 lines
1.1 KiB
JSON
{
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"id": "expr-002",
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"skills": ["n8n-expression-syntax"],
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"query": "My webhook workflow is showing {{$json.name}} as undefined even though I'm sending {\"name\": \"John\"} in the webhook POST request. What am I doing wrong?",
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"expected_behavior": [
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"Identifies that webhook data is nested under .body property",
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"Explains the webhook node output structure",
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"Provides the corrected expression: {{$json.body.name}}",
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"Shows the complete webhook data structure with headers, params, query, and body",
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"Emphasizes this is a CRITICAL gotcha specific to webhook nodes"
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],
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"baseline_without_skill": {
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"likely_response": "May suggest debugging or checking data format, unlikely to know webhook-specific structure",
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"expected_quality": "Low - would miss the webhook .body nesting"
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},
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"with_skill_expected": {
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"response_quality": "High - identifies webhook-specific issue immediately",
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"uses_skill_content": true,
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"provides_correct_syntax": true,
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"explains_webhook_structure": true,
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"warns_about_common_gotcha": true
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}
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}
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