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+# n8n Node Configuration
+
+Expert guidance for operation-aware node configuration with property dependencies.
+
+## Overview
+
+**Skill Name**: n8n Node Configuration
+**Priority**: Medium
+**Purpose**: Teach operation-aware configuration with progressive discovery and dependency awareness
+
+## The Problem This Solves
+
+Node configuration patterns:
+
+- get_node_essentials is the primary discovery tool (18s avg from search → essentials)
+- 91.7% success rate with essentials-based configuration
+- 56 seconds average between configuration edits
+
+**Key insight**: Most configurations only need essentials, not full schema!
+
+## What This Skill Teaches
+
+### Core Concepts
+
+1. **Operation-Aware Configuration**
+   - Resource + operation determine required fields
+   - Different operations = different requirements
+   - Always check requirements when changing operation
+
+2. **Property Dependencies**
+   - Fields appear/disappear based on other field values
+   - displayOptions control visibility
+   - Conditional required fields
+   - Understanding dependency chains
+
+3. **Progressive Discovery**
+   - Start with get_node_essentials (91.7% success)
+   - Escalate to get_property_dependencies if needed
+   - Use get_node_info only when necessary
+   - Right tool for right job
+
+4. **Configuration Workflow**
+   - Identify → Discover → Configure → Validate → Iterate
+   - Average 2-3 validation cycles
+   - Read errors for dependency hints
+   - 56 seconds between edits average
+
+5. **Common Patterns**
+   - Resource/operation nodes (Slack, Sheets)
+   - HTTP-based nodes (HTTP Request, Webhook)
+   - Database nodes (Postgres, MySQL)
+   - Conditional logic nodes (IF, Switch)
+
+## File Structure
+
+```
+n8n-node-configuration/
+├── SKILL.md (692 lines)
+│   Main configuration guide
+│   - Configuration philosophy (progressive disclosure)
+│   - Core concepts (operation-aware, dependencies)
+│   - Configuration workflow (8-step process)
+│   - get_node_essentials vs get_node_info
+│   - Property dependencies deep dive
+│   - Common node patterns (4 categories)
+│   - Operation-specific examples
+│   - Conditional requirements
+│   - Anti-patterns and best practices
+│
+├── DEPENDENCIES.md (671 lines)
+│   Property dependencies reference
+│   - displayOptions mechanism
+│   - show vs hide rules
+│   - Multiple conditions (AND logic)
+│   - Multiple values (OR logic)
+│   - 4 common dependency patterns
+│   - Using get_property_dependencies
+│   - Complex dependency examples
+│   - Nested dependencies
+│   - Auto-sanitization interaction
+│   - Troubleshooting guide
+│   - Advanced patterns
+│
+├── OPERATION_PATTERNS.md (783 lines)
+│   Common configurations by node type
+│   - HTTP Request (GET/POST/PUT/DELETE)
+│   - Webhook (basic/auth/response)
+│   - Slack (post/update/create)
+│   - Gmail (send/get)
+│   - Postgres (query/insert/update)
+│   - Set (values/mapping)
+│   - Code (per-item/all-items)
+│   - IF (string/number/boolean)
+│   - Switch (rules/fallback)
+│   - OpenAI (chat completion)
+│   - Schedule (daily/interval/cron)
+│   - Gotchas and tips for each
+│
+└── README.md (this file)
+    Skill metadata and statistics
+```
+
+**Total**: ~2,146 lines across 4 files + 4 evaluations
+
+## Usage Statistics
+
+Configuration metrics:
+
+| Metric | Value | Insight |
+|---|---|---|
+| get_node_essentials | Primary tool | Most popular discovery pattern |
+| Success rate (essentials) | 91.7% | Essentials sufficient for most |
+| Avg time search→essentials | 18 seconds | Fast discovery workflow |
+| Avg time between edits | 56 seconds | Iterative configuration |
+
+## Tool Usage Pattern
+
+**Most common discovery pattern**:
+```
+search_nodes → get_node_essentials (18s average)
+```
+
+**Configuration cycle**:
+```
+get_node_essentials → configure → validate → iterate (56s avg per edit)
+```
+
+## Key Insights
+
+### 1. Progressive Disclosure Works
+
+**91.7% success rate** with get_node_essentials proves most configurations don't need full schema.
+
+**Strategy**:
+1. Start with essentials
+2. Escalate to dependencies if stuck
+3. Use full schema only when necessary
+
+### 2. Operations Determine Requirements
+
+**Same node, different operation = different requirements**
+
+Example: Slack message
+- `operation="post"` → needs channel + text
+- `operation="update"` → needs messageId + text (different!)
+
+### 3. Dependencies Control Visibility
+
+**Fields appear/disappear based on other values**
+
+Example: HTTP Request
+- `method="GET"` → body hidden
+- `method="POST"` + `sendBody=true` → body required
+
+### 4. Configuration is Iterative
+
+**Average 56 seconds between edits** shows configuration is iterative, not one-shot.
+
+**Normal workflow**:
+1. Configure minimal
+2. Validate → error
+3. Add missing field
+4. Validate → error
+5. Adjust value
+6. Validate → valid ✅
+
+### 5. Common Gotchas Exist
+
+**Top 5 gotchas** from patterns:
+1. Webhook data under `$json.body` (not `$json`)
+2. POST needs `sendBody: true`
+3. Slack channel format (`#name`)
+4. SQL parameterized queries (injection prevention)
+5. Timezone must be explicit (schedule nodes)
+
+## Usage Examples
+
+### Example 1: Basic Configuration Flow
+
+```javascript
+// Step 1: Get essentials
+const info = get_node_essentials({
+  nodeType: "nodes-base.slack"
+});
+
+// Step 2: Configure for operation
+{
+  "resource": "message",
+  "operation": "post",
+  "channel": "#general",
+  "text": "Hello!"
+}
+
+// Step 3: Validate
+validate_node_operation({...});
+// ✅ Valid!
+```
+
+### Example 2: Handling Dependencies
+
+```javascript
+// Step 1: Configure HTTP POST
+{
+  "method": "POST",
+  "url": "https://api.example.com/create"
+}
+
+// Step 2: Validate → Error: "sendBody required"
+// Step 3: Check dependencies
+get_property_dependencies({
+  nodeType: "nodes-base.httpRequest"
+});
+// Shows: body visible when sendBody=true
+
+// Step 4: Fix
+{
+  "method": "POST",
+  "url": "https://api.example.com/create",
+  "sendBody": true,
+  "body": {
+    "contentType": "json",
+    "content": {...}
+  }
+}
+// ✅ Valid!
+```
+
+### Example 3: Operation Change
+
+```javascript
+// Initial config (post operation)
+{
+  "resource": "message",
+  "operation": "post",
+  "channel": "#general",
+  "text": "Hello"
+}
+
+// Change operation
+{
+  "resource": "message",
+  "operation": "update",  // Changed!
+  // Need to check new requirements
+}
+
+// Get essentials for update operation
+get_node_essentials({nodeType: "nodes-base.slack"});
+// Shows: messageId required, channel optional
+
+// Correct config
+{
+  "resource": "message",
+  "operation": "update",
+  "messageId": "1234567890.123456",
+  "text": "Updated"
+}
+```
+
+## When This Skill Activates
+
+**Trigger phrases**:
+- "how to configure"
+- "what fields are required"
+- "property dependencies"
+- "get_node_essentials vs get_node_info"
+- "operation-specific"
+- "field not visible"
+
+**Common scenarios**:
+- Configuring new nodes
+- Understanding required fields
+- Field appears/disappears unexpectedly
+- Choosing between discovery tools
+- Switching operations
+- Learning common patterns
+
+## Integration with Other Skills
+
+### Works With:
+- **n8n MCP Tools Expert** - How to call discovery tools correctly
+- **n8n Validation Expert** - Interpret missing_required errors
+- **n8n Expression Syntax** - Configure expression fields
+- **n8n Workflow Patterns** - Apply patterns with proper node config
+
+### Complementary:
+- Use MCP Tools Expert to learn tool selection
+- Use Validation Expert to fix configuration errors
+- Use Expression Syntax for dynamic field values
+- Use Workflow Patterns to understand node relationships
+
+## Testing
+
+**Evaluations**: 4 test scenarios
+
+1. **eval-001-property-dependencies.json**
+   - Tests understanding of displayOptions
+   - Guides to get_property_dependencies
+   - Explains conditional requirements
+
+2. **eval-002-operation-specific-config.json**
+   - Tests operation-aware configuration
+   - Identifies resource + operation pattern
+   - References OPERATION_PATTERNS.md
+
+3. **eval-003-conditional-fields.json**
+   - Tests unary vs binary operators
+   - Explains singleValue dependency
+   - Mentions auto-sanitization
+
+4. **eval-004-essentials-vs-info.json**
+   - Tests tool selection knowledge
+   - Explains progressive disclosure
+   - Provides success rate statistics
+
+## Success Metrics
+
+**Before this skill**:
+- Using get_node_info for everything (slow, overwhelming)
+- Not understanding property dependencies
+- Confused when fields appear/disappear
+- Not aware of operation-specific requirements
+- Trial and error configuration
+
+**After this skill**:
+- Start with get_node_essentials (91.7% success)
+- Understand displayOptions mechanism
+- Predict field visibility based on dependencies
+- Check requirements when changing operations
+- Systematic configuration approach
+- Know common patterns by node type
+
+## Coverage
+
+**Node types covered**: Top 20 most-used nodes
+
+| Category | Nodes | Coverage |
+|---|---|---|
+| HTTP/API | HTTP Request, Webhook | Complete |
+| Communication | Slack, Gmail | Common operations |
+| Database | Postgres, MySQL | CRUD operations |
+| Transform | Set, Code | All modes |
+| Conditional | IF, Switch | All operator types |
+| AI | OpenAI | Chat completion |
+| Schedule | Schedule Trigger | All modes |
+
+## Related Documentation
+
+- **n8n-mcp MCP Server**: Provides discovery tools
+- **n8n Node API**: get_node_essentials, get_property_dependencies, get_node_info
+- **n8n Schema**: displayOptions mechanism, property definitions
+
+## Version History
+
+- **v1.0** (2025-10-20): Initial implementation
+  - SKILL.md with configuration workflow
+  - DEPENDENCIES.md with displayOptions deep dive
+  - OPERATION_PATTERNS.md with 20+ node patterns
+  - 4 evaluation scenarios
+
+## Author
+
+Conceived by Romuald Członkowski - [www.aiadvisors.pl/en](https://www.aiadvisors.pl/en)
+
+Part of the n8n-skills meta-skill collection.