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+---
+name: react-flow-architect
+description: Expert ReactFlow architect for building interactive graph applications with hierarchical node-edge systems, performance optimization, and auto-layout integration. Use when Claude needs to create or optimize ReactFlow applications for: (1) Interactive process graphs with expand/collapse navigation, (2) Hierarchical tree structures with drag & drop, (3) Performance-optimized large datasets with incremental rendering, (4) Auto-layout integration with Dagre, (5) Complex state management for nodes and edges, or any advanced ReactFlow visualization requirements.
+---
+
+# ReactFlow Architect
+
+Build production-ready ReactFlow applications with hierarchical navigation, performance optimization, and advanced state management.
+
+## Quick Start
+
+Create basic interactive graph:
+
+```tsx
+import ReactFlow, { Node, Edge } from 'reactflow';
+
+const nodes: Node[] = [
+  { id: '1', position: { x: 0, y: 0 }, data: { label: 'Node 1' } },
+  { id: '2', position: { x: 100, y: 100 }, data: { label: 'Node 2' } }
+];
+
+const edges: Edge[] = [
+  { id: 'e1-2', source: '1', target: '2' }
+];
+
+export default function Graph() {
+  return (
+    <ReactFlow nodes={nodes} edges={edges} />
+  );
+}
+```
+
+## Core Patterns
+
+### Hierarchical Tree Navigation
+
+Build expandable/collapsible tree structures with parent-child relationships.
+
+#### Node Schema
+```typescript
+interface TreeNode extends Node {
+  data: {
+    label: string;
+    level: number;
+    hasChildren: boolean;
+    isExpanded: boolean;
+    childCount: number;
+    category: 'root' | 'category' | 'process' | 'detail';
+  };
+}
+```
+
+#### Incremental Node Building
+```typescript
+const buildVisibleNodes = useCallback((
+  allNodes: TreeNode[],
+  expandedIds: Set<string>,
+  otherDeps: any[]
+) => {
+  const visibleNodes = new Map<string, TreeNode>();
+  const visibleEdges = new Map<string, TreeEdge>();
+  
+  // Start with root nodes
+  const rootNodes = allNodes.filter(n => n.data.level === 0);
+  
+  // Recursively add visible nodes
+  const addVisibleChildren = (node: TreeNode) => {
+    visibleNodes.set(node.id, node);
+    
+    if (expandedIds.has(node.id)) {
+      const children = allNodes.filter(n => n.parentNode === node.id);
+      children.forEach(child => addVisibleChildren(child));
+    }
+  };
+  
+  rootNodes.forEach(root => addVisibleChildren(root));
+  
+  return { nodes: Array.from(visibleNodes.values()), edges: Array.from(visibleEdges.values()) };
+}, []);
+```
+
+### Performance Optimization
+
+Handle large datasets with incremental rendering and memoization.
+
+#### Incremental Rendering
+```typescript
+const useIncrementalGraph = (allNodes: Node[], allEdges: Edge[], expandedList: string[]) => {
+  const prevExpandedListRef = useRef<Set<string>>(new Set());
+  const prevOtherDepsRef = useRef<any[]>([]);
+  
+  const { visibleNodes, visibleEdges } = useMemo(() => {
+    const currentExpandedSet = new Set(expandedList);
+    const prevExpandedSet = prevExpandedListRef.current;
+    
+    // Check if expanded list changed
+    const expandedChanged = !areSetsEqual(currentExpandedSet, prevExpandedSet);
+    
+    // Check if other dependencies changed
+    const otherDepsChanged = !arraysEqual(otherDeps, prevOtherDepsRef.current);
+    
+    if (expandedChanged && !otherDepsChanged) {
+      // Only expanded list changed - incremental update
+      return buildIncrementalUpdate(
+        cachedVisibleNodesRef.current,
+        cachedVisibleEdgesRef.current,
+        allNodes,
+        allEdges,
+        currentExpandedSet,
+        prevExpandedSet
+      );
+    } else {
+      // Full rebuild needed
+      return buildFullGraph(allNodes, allEdges, currentExpandedSet);
+    }
+  }, [allNodes, allEdges, expandedList, ...otherDeps]);
+  
+  return { visibleNodes, visibleEdges };
+};
+```
+
+#### Memoization Patterns
+```typescript
+// Memoize node components to prevent unnecessary re-renders
+const ProcessNode = memo(({ data, selected }: NodeProps) => {
+  return (
+    <div className={`process-node ${selected ? 'selected' : ''}`}>
+      {data.label}
+    </div>
+  );
+}, (prevProps, nextProps) => {
+  // Custom comparison function
+  return (
+    prevProps.data.label === nextProps.data.label &&
+    prevProps.selected === nextProps.selected &&
+    prevProps.data.isExpanded === nextProps.data.isExpanded
+  );
+});
+
+// Memoize edge calculations
+const styledEdges = useMemo(() => {
+  return edges.map(edge => ({
+    ...edge,
+    style: {
+      ...edge.style,
+      strokeWidth: selectedEdgeId === edge.id ? 3 : 2,
+      stroke: selectedEdgeId === edge.id ? '#3b82f6' : '#94a3b8',
+    },
+    animated: selectedEdgeId === edge.id,
+  }));
+}, [edges, selectedEdgeId]);
+```
+
+### State Management
+
+Complex node/edge state patterns with undo/redo and persistence.
+
+#### Reducer Pattern
+```typescript
+type GraphAction = 
+  | { type: 'SELECT_NODE'; payload: string }
+  | { type: 'SELECT_EDGE'; payload: string }
+  | { type: 'TOGGLE_EXPAND'; payload: string }
+  | { type: 'UPDATE_NODES'; payload: Node[] }
+  | { type: 'UPDATE_EDGES'; payload: Edge[] }
+  | { type: 'UNDO' }
+  | { type: 'REDO' };
+
+const graphReducer = (state: GraphState, action: GraphAction): GraphState => {
+  switch (action.type) {
+    case 'SELECT_NODE':
+      return {
+        ...state,
+        selectedNodeId: action.payload,
+        selectedEdgeId: null,
+      };
+      
+    case 'TOGGLE_EXPAND':
+      const newExpanded = new Set(state.expandedNodeIds);
+      if (newExpanded.has(action.payload)) {
+        newExpanded.delete(action.payload);
+      } else {
+        newExpanded.add(action.payload);
+      }
+      return {
+        ...state,
+        expandedNodeIds: newExpanded,
+        isDirty: true,
+      };
+      
+    default:
+      return state;
+  }
+};
+```
+
+#### History Management
+```typescript
+const useHistoryManager = (state: GraphState, dispatch: Dispatch<GraphAction>) => {
+  const canUndo = state.historyIndex > 0;
+  const canRedo = state.historyIndex < state.history.length - 1;
+  
+  const undo = useCallback(() => {
+    if (canUndo) {
+      const newIndex = state.historyIndex - 1;
+      const historyEntry = state.history[newIndex];
+      
+      dispatch({
+        type: 'RESTORE_FROM_HISTORY',
+        payload: {
+          ...historyEntry,
+          historyIndex: newIndex,
+        },
+      });
+    }
+  }, [canUndo, state.historyIndex, state.history]);
+  
+  const saveToHistory = useCallback(() => {
+    dispatch({ type: 'SAVE_TO_HISTORY' });
+  }, [dispatch]);
+  
+  return { canUndo, canRedo, undo, redo, saveToHistory };
+};
+```
+
+## Advanced Features
+
+### Auto-Layout Integration
+
+Integrate Dagre for automatic graph layout:
+
+```typescript
+import dagre from 'dagre';
+
+const layoutOptions = {
+  rankdir: 'TB', // Top to Bottom
+  nodesep: 100,   // Node separation
+  ranksep: 150,   // Rank separation
+  marginx: 50,
+  marginy: 50,
+  edgesep: 10,
+};
+
+const applyLayout = (nodes: Node[], edges: Edge[]) => {
+  const g = new dagre.graphlib.Graph();
+  g.setGraph(layoutOptions);
+  g.setDefaultEdgeLabel(() => ({}));
+  
+  // Add nodes to graph
+  nodes.forEach(node => {
+    g.setNode(node.id, { width: 200, height: 100 });
+  });
+  
+  // Add edges to graph
+  edges.forEach(edge => {
+    g.setEdge(edge.source, edge.target);
+  });
+  
+  // Calculate layout
+  dagre.layout(g);
+  
+  // Apply positions
+  return nodes.map(node => ({
+    ...node,
+    position: {
+      x: g.node(node.id).x - 100,
+      y: g.node(node.id).y - 50,
+    },
+  }));
+};
+
+// Debounce layout calculations
+const debouncedLayout = useMemo(
+  () => debounce(applyLayout, 150),
+  []
+);
+```
+
+### Focus Mode
+
+Isolate selected nodes and their direct connections:
+
+```typescript
+const useFocusMode = (selectedNodeId: string, allNodes: Node[], allEdges: Edge[]) => {
+  return useMemo(() => {
+    if (!selectedNodeId) return { nodes: allNodes, edges: allEdges };
+    
+    // Get direct connections
+    const connectedNodeIds = new Set([selectedNodeId]);
+    const focusedEdges: Edge[] = [];
+    
+    allEdges.forEach(edge => {
+      if (edge.source === selectedNodeId || edge.target === selectedNodeId) {
+        focusedEdges.push(edge);
+        connectedNodeIds.add(edge.source);
+        connectedNodeIds.add(edge.target);
+      }
+    });
+    
+    // Get connected nodes
+    const focusedNodes = allNodes.filter(n => connectedNodeIds.has(n.id));
+    
+    return { nodes: focusedNodes, edges: focusedEdges };
+  }, [selectedNodeId, allNodes, allEdges]);
+};
+
+// Smooth transitions for focus mode
+const focusModeStyles = {
+  transition: 'all 0.3s ease-in-out',
+  opacity: isInFocus ? 1 : 0.3,
+  filter: isInFocus ? 'none' : 'blur(2px)',
+};
+```
+
+### Search Integration
+
+Search and navigate to specific nodes:
+
+```typescript
+const searchNodes = useCallback((
+  nodes: Node[],
+  query: string
+) => {
+  if (!query.trim()) return [];
+  
+  const lowerQuery = query.toLowerCase();
+  return nodes.filter(node =>
+    node.data.label.toLowerCase().includes(lowerQuery) ||
+    node.data.description?.toLowerCase().includes(lowerQuery)
+  );
+}, []);
+
+const navigateToSearchResult = (nodeId: string) => {
+  // Expand parent nodes
+  const nodePath = calculateBreadcrumbPath(nodeId, allNodes);
+  const parentIds = nodePath.slice(0, -1).map(n => n.id);
+  
+  setExpandedIds(prev => new Set([...prev, ...parentIds]));
+  setSelectedNodeId(nodeId);
+  
+  // Fit view to node
+  fitView({ nodes: [{ id: nodeId }], duration: 800 });
+};
+```
+
+## Performance Tools
+
+### Graph Performance Analyzer
+
+Create a performance analysis script:
+
+```javascript
+// scripts/graph-analyzer.js
+class GraphAnalyzer {
+  analyzeCode(content, filePath) {
+    const analysis = {
+      metrics: {
+        nodeCount: this.countNodes(content),
+        edgeCount: this.countEdges(content),
+        renderTime: this.estimateRenderTime(content),
+        memoryUsage: this.estimateMemoryUsage(content),
+        complexity: this.calculateComplexity(content)
+      },
+      issues: [],
+      optimizations: [],
+      patterns: this.detectPatterns(content)
+    };
+
+    // Detect performance issues
+    this.detectPerformanceIssues(analysis);
+    
+    // Suggest optimizations
+    this.suggestOptimizations(analysis);
+
+    return analysis;
+  }
+
+  countNodes(content) {
+    const nodePatterns = [
+      /nodes:\s*\[.*?\]/gs,
+      /const\s+\w+\s*=\s*\[.*?id:.*?position:/gs
+    ];
+
+    let totalCount = 0;
+    nodePatterns.forEach(pattern => {
+      const matches = content.match(pattern);
+      if (matches) {
+        matches.forEach(match => {
+          const nodeMatches = match.match(/id:\s*['"`][^'"`]+['"`]/g);
+          if (nodeMatches) {
+            totalCount += nodeMatches.length;
+          }
+        });
+      }
+    });
+
+    return totalCount;
+  }
+
+  estimateRenderTime(content) {
+    const nodeCount = this.countNodes(content);
+    const edgeCount = this.countEdges(content);
+    
+    // Base render time estimation (ms)
+    const baseTime = 5;
+    const nodeTime = nodeCount * 0.1;
+    const edgeTime = edgeCount * 0.05;
+    
+    return baseTime + nodeTime + edgeTime;
+  }
+
+  detectPerformanceIssues(analysis) {
+    const { metrics } = analysis;
+
+    if (metrics.nodeCount > 500) {
+      analysis.issues.push({
+        type: 'HIGH_NODE_COUNT',
+        severity: 'high',
+        message: `Too many nodes (${metrics.nodeCount}). Consider virtualization.`,
+        suggestion: 'Implement virtualization or reduce visible nodes'
+      });
+    }
+
+    if (metrics.renderTime > 16) {
+      analysis.issues.push({
+        type: 'SLOW_RENDER',
+        severity: 'high',
+        message: `Render time (${metrics.renderTime.toFixed(2)}ms) exceeds 60fps.`,
+        suggestion: 'Optimize with memoization and incremental rendering'
+      });
+    }
+  }
+}
+```
+
+## Best Practices
+
+### Performance Guidelines
+
+1. **Use React.memo** for node components to prevent unnecessary re-renders
+2. **Implement virtualization** for graphs with 1000+ nodes
+3. **Debounce layout calculations** during rapid interactions
+4. **Use useCallback** for edge creation and manipulation functions
+5. **Implement proper TypeScript types** for nodes and edges
+
+### Memory Management
+
+```typescript
+// Use Map for O(1) lookups instead of array.find
+const nodesById = useMemo(() => 
+  new Map(allNodes.map(n => [n.id, n])), [allNodes]
+);
+
+// Cache layout results
+const layoutCacheRef = useRef<Map<string, Node[]>>(new Map());
+
+// Proper cleanup in useEffect
+useEffect(() => {
+  return () => {
+    // Clean up any lingering references
+    nodesMapRef.current.clear();
+    edgesMapRef.current.clear();
+  };
+}, []);
+```
+
+### State Optimization
+
+```typescript
+// Use useRef for objects that shouldn't trigger re-renders
+const autoSaveDataRef = useRef({
+  nodes: [],
+  edges: [],
+  lastSaved: Date.now(),
+});
+
+// Update properties without breaking reference
+const updateAutoSaveData = (newNodes: Node[], newEdges: Edge[]) => {
+  autoSaveDataRef.current.nodes = newNodes;
+  autoSaveDataRef.current.edges = newEdges;
+  autoSaveDataRef.current.lastSaved = Date.now();
+};
+```
+
+## Common Problems & Solutions
+
+### Performance Issues
+
+- **Problem**: Lag during node expansion
+- **Solution**: Implement incremental rendering with change detection
+
+- **Problem**: Memory usage increases over time
+- **Solution**: Proper cleanup in useEffect hooks and use WeakMap for temporary data
+
+### Layout Conflicts
+
+- **Problem**: Manual positioning conflicts with auto-layout
+- **Solution**: Use controlled positioning state and separate layout modes
+
+### Rendering Issues
+
+- **Problem**: Excessive re-renders
+- **Solution**: Use memo, useMemo, and useCallback with stable dependencies
+
+- **Problem**: Slow layout calculations
+- **Solution**: Debounce layout calculations and cache results
+
+## Complete Example
+
+```typescript
+import React, { useState, useCallback, useMemo, useRef } from 'react';
+import ReactFlow, { Node, Edge, useReactFlow } from 'reactflow';
+import dagre from 'dagre';
+import { debounce } from 'lodash';
+
+interface GraphState {
+  nodes: Node[];
+  edges: Edge[];
+  selectedNodeId: string | null;
+  expandedNodeIds: Set<string>;
+  history: GraphState[];
+  historyIndex: number;
+}
+
+export default function InteractiveGraph() {
+  const [state, setState] = useState<GraphState>({
+    nodes: [],
+    edges: [],
+    selectedNodeId: null,
+    expandedNodeIds: new Set(),
+    history: [],
+    historyIndex: 0,
+  });
+
+  const { fitView } = useReactFlow();
+  const layoutCacheRef = useRef<Map<string, Node[]>>(new Map());
+
+  // Memoized styled edges
+  const styledEdges = useMemo(() => {
+    return state.edges.map(edge => ({
+      ...edge,
+      style: {
+        ...edge.style,
+        strokeWidth: state.selectedNodeId === edge.source || state.selectedNodeId === edge.target ? 3 : 2,
+        stroke: state.selectedNodeId === edge.source || state.selectedNodeId === edge.target ? '#3b82f6' : '#94a3b8',
+      },
+      animated: state.selectedNodeId === edge.source || state.selectedNodeId === edge.target,
+    }));
+  }, [state.edges, state.selectedNodeId]);
+
+  // Debounced layout calculation
+  const debouncedLayout = useMemo(
+    () => debounce((nodes: Node[], edges: Edge[]) => {
+      const cacheKey = generateLayoutCacheKey(nodes, edges);
+      
+      if (layoutCacheRef.current.has(cacheKey)) {
+        return layoutCacheRef.current.get(cacheKey)!;
+      }
+
+      const layouted = applyDagreLayout(nodes, edges);
+      layoutCacheRef.current.set(cacheKey, layouted);
+      
+      return layouted;
+    }, 150),
+    []
+  );
+
+  const handleNodeClick = useCallback((event: React.MouseEvent, node: Node) => {
+    setState(prev => ({
+      ...prev,
+      selectedNodeId: node.id,
+    }));
+  }, []);
+
+  const handleToggleExpand = useCallback((nodeId: string) => {
+    setState(prev => {
+      const newExpanded = new Set(prev.expandedNodeIds);
+      if (newExpanded.has(nodeId)) {
+        newExpanded.delete(nodeId);
+      } else {
+        newExpanded.add(nodeId);
+      }
+
+      return {
+        ...prev,
+        expandedNodeIds: newExpanded,
+      };
+    });
+  }, []);
+
+  return (
+    <ReactFlow
+      nodes={state.nodes}
+      edges={styledEdges}
+      onNodeClick={handleNodeClick}
+      fitView
+    />
+  );
+}
+```
+
+This comprehensive skill provides everything needed to build production-ready ReactFlow applications with hierarchical navigation, performance optimization, and advanced state management patterns.