/n8n-mcp-tools-expert

name: n8n-mcp-tools-expert
description: Expert guide for using n8n-mcp MCP tools effectively. Use when searching for nodes, validating configurations, accessing templates, managing workflows, organizing workflows into folders, managing credentials, auditing instance security, or using any n8n-mcp tool. Provides tool selection guidance, parameter formats, and common patterns. IMPORTANT — Always consult this skill before calling any n8n-mcp tool — it prevents common mistakes like wrong nodeType formats, incorrect parameter structures, and inefficient tool usage. If the user mentions n8n, workflows, nodes, or automation and you have n8n MCP tools available, use this skill first.

n8n MCP Tools Expert

Master guide for using n8n-mcp MCP server tools to build workflows.

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Tool Categories

n8n-mcp provides tools organized into categories:

1. **Node Discovery** → [SEARCH_GUIDE.md](SEARCH_GUIDE.md) 2. **Configuration Validation** → [VALIDATION_GUIDE.md](VALIDATION_GUIDE.md) 3. **Workflow Management** → [WORKFLOW_GUIDE.md](WORKFLOW_GUIDE.md) 4. **Template Library** - Search and deploy 2,700+ real workflows 5. **Data Tables** - Manage n8n data tables and rows (`n8n_manage_datatable`) 6. **Workflow Folders** - Folder CRUD + workflow placement (`n8n_manage_folders`) 7. **Credential Management** - Full credential CRUD + schema discovery (`n8n_manage_credentials`) 8. **Security & Audit** - Instance security auditing with custom deep scan (`n8n_audit_instance`) 9. **Documentation & Guides** - Tool docs, AI agent guide, Code node guides

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Quick Reference

Most Used Tools (by success rate)

| Tool | Use When | Speed | |------|----------|-------| | `search_nodes` | Finding nodes by keyword | <20ms | | `get_node` | Understanding node operations (detail="standard") | <10ms | | `validate_node` | Checking configurations (mode="full") | <100ms | | `n8n_create_workflow` | Creating workflows | 100-500ms | | `n8n_update_partial_workflow` | Editing workflows (MOST USED!) | 50-200ms | | `validate_workflow` | Checking complete workflow | 100-500ms | | `n8n_deploy_template` | Deploy template to n8n instance | 200-500ms | | `n8n_manage_datatable` | Managing data tables and rows | 50-500ms | | `n8n_manage_folders` | Folder CRUD + organizing workflows | 100-500ms | | `n8n_manage_credentials` | Credential CRUD + schema discovery | 50-500ms | | `n8n_audit_instance` | Security audit (built-in + custom scan) | 500-5000ms | | `n8n_autofix_workflow` | Auto-fix validation errors | 200-1500ms |

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Tool Selection Guide

Finding the Right Node

**Workflow**:

1. search_nodes({query: "keyword"})
2. get_node({nodeType: "nodes-base.name"})
3. [Optional] get_node({nodeType: "nodes-base.name", mode: "docs"})

**Example**:

// Step 1: Search
search_nodes({query: "slack"})
// Returns: nodes-base.slack

// Step 2: Get details
get_node({nodeType: "nodes-base.slack"})
// Returns: operations, properties, examples (standard detail)

// Step 3: Get readable documentation
get_node({nodeType: "nodes-base.slack", mode: "docs"})
// Returns: markdown documentation

**Common pattern**: search → get_node (18s average)

Validating Configuration

**Workflow**:

1. validate_node({nodeType, config: {}, mode: "minimal"}) - Check required fields
2. validate_node({nodeType, config, profile: "runtime"}) - Full validation
3. [Repeat] Fix errors, validate again

**Common pattern**: validate → fix → validate (23s thinking, 58s fixing per cycle)

Managing Workflows

**Workflow**:

1. n8n_create_workflow({name, nodes, connections})
2. n8n_validate_workflow({id})
3. n8n_update_partial_workflow({id, operations: [...]})
4. n8n_validate_workflow({id}) again
5. n8n_update_partial_workflow({id, operations: [{type: "activateWorkflow"}]})

**Common pattern**: iterative updates (56s average between edits)

Critical: Node JSON Hygiene When Creating Workflows

Three structural mistakes in generated node JSON break the n8n UI even when the workflow validates:

1. **Never emit a `credentials` block with a placeholder ID.** A fake ID like `"id": "REPLACE_ME"` renders the credential selector permanently disabled and non-clickable in the n8n UI ("No credentials yet") — the user has to recreate the node from scratch. If you don't know the real credential ID, **omit the `credentials` block entirely**; an absent block shows a normal empty dropdown the user can click. Use `n8n_manage_credentials({action: "list"})` to discover real credential IDs first.

// ❌ Breaks the credential selector
"credentials": {"httpHeaderAuth": {"id": "REPLACE_ME", "name": "My API Key"}}

// ✅ Unknown ID → omit credentials block; user picks in UI
// ✅ Known ID (from n8n_manage_credentials list) → use the real ID

2. **Generate UUID v4 values for node `id`** — not human-readable strings like `"http-list-node"`. n8n's frontend uses node IDs for form binding and credential component initialization; non-UUID IDs cause subtle UI breakage.

3. **Use the current `typeVersion`** for each node — check `get_node` rather than hardcoding remembered versions (e.g. httpRequest is at 4.4+, not 4.2).

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Critical: nodeType Formats

**Two different formats** for different tools!

Format 1: Search/Validate Tools

// Use SHORT prefix
"nodes-base.slack"
"nodes-base.httpRequest"
"nodes-base.webhook"
"nodes-langchain.agent"

**Tools that use this**:

• search_nodes (returns this format)
• get_node
• validate_node
• validate_workflow

Format 2: Workflow Tools

// Use FULL prefix
"n8n-nodes-base.slack"
"n8n-nodes-base.httpRequest"
"n8n-nodes-base.webhook"
"@n8n/n8n-nodes-langchain.agent"

**Tools that use this**:

• n8n_create_workflow
• n8n_update_partial_workflow

Conversion

// search_nodes returns BOTH formats
{
  "nodeType": "nodes-base.slack",          // For search/validate tools
  "workflowNodeType": "n8n-nodes-base.slack"  // For workflow tools
}