feat: Implement n8n-MCP Enhancement Plan v2.1 Final

- Implement simple node loader supporting n8n-nodes-base and langchain packages
- Create parser handling declarative, programmatic, and versioned nodes
- Build documentation mapper with 89% coverage (405/457 nodes)
- Setup SQLite database with minimal schema
- Create rebuild script for one-command database updates
- Implement validation script for critical nodes
- Update MCP server with documentation-focused tools
- Add npm scripts for streamlined workflow

Successfully loads 457/458 nodes with accurate documentation mapping.
Versioned node detection working (46 nodes detected).
3/4 critical nodes pass validation tests.

Known limitations:
- Slack operations extraction incomplete for some versioned nodes
- One langchain node fails due to missing dependency
- No AI tools detected (none have usableAsTool flag)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/mcp/tools-update.ts

@@ -0,0 +1,98 @@
+import { ToolDefinition } from '../types';
+
+export const n8nDocumentationTools: ToolDefinition[] = [
+  {
+    name: 'list_nodes',
+    description: 'List all available n8n nodes with filtering options',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        package: {
+          type: 'string',
+          description: 'Filter by package name (e.g., n8n-nodes-base, @n8n/n8n-nodes-langchain)',
+        },
+        category: {
+          type: 'string',
+          description: 'Filter by category',
+        },
+        developmentStyle: {
+          type: 'string',
+          enum: ['declarative', 'programmatic'],
+          description: 'Filter by development style',
+        },
+        isAITool: {
+          type: 'boolean',
+          description: 'Filter to show only AI tools',
+        },
+        limit: {
+          type: 'number',
+          description: 'Maximum number of results to return',
+          default: 50,
+        },
+      },
+    },
+  },
+  {
+    name: 'get_node_info',
+    description: 'Get comprehensive information about a specific n8n node',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        nodeType: {
+          type: 'string',
+          description: 'The node type (e.g., httpRequest, slack, code)',
+        },
+      },
+      required: ['nodeType'],
+    },
+  },
+  {
+    name: 'search_nodes',
+    description: 'Full-text search across all node documentation',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        query: {
+          type: 'string',
+          description: 'Search query',
+        },
+        limit: {
+          type: 'number',
+          description: 'Maximum number of results',
+          default: 20,
+        },
+      },
+      required: ['query'],
+    },
+  },
+  {
+    name: 'list_ai_tools',
+    description: 'List all nodes that can be used as AI Agent tools',
+    inputSchema: {
+      type: 'object',
+      properties: {},
+    },
+  },
+  {
+    name: 'get_node_documentation',
+    description: 'Get the full documentation for a specific node',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        nodeType: {
+          type: 'string',
+          description: 'The node type',
+        },
+      },
+      required: ['nodeType'],
+    },
+  },
+  {
+    name: 'get_database_statistics',
+    description: 'Get statistics about the node database',
+    inputSchema: {
+      type: 'object',
+      properties: {},
+    },
+  },
+];