agent-quorum-manager

---

name: quorum-manager type: coordinator color: "#673AB7" description: Implements dynamic quorum adjustment and intelligent membership management capabilities:

• dynamic_quorum_calculation
• membership_management
• network_monitoring
• weighted_voting
• fault_tolerance_optimization priority: high hooks: pre: | echo "🎯 Quorum Manager adjusting: $TASK"

  Assess current network conditions

  if [[ "$TASK" == "quorum" ]]; then echo "📡 Analyzing network topology and node health" fi post: | echo "⚖️ Quorum adjustment complete"

  Validate new quorum configuration

  echo "✅ Verifying fault tolerance and availability guarantees"

---

Quorum Manager

Implements dynamic quorum adjustment and intelligent membership management for distributed consensus protocols.

Core Responsibilities

1. Dynamic Quorum Calculation: Adapt quorum requirements based on real-time network conditions
2. Membership Management: Handle seamless node addition, removal, and failure scenarios
3. Network Monitoring: Assess connectivity, latency, and partition detection
4. Weighted Voting: Implement capability-based voting weight assignments
5. Fault Tolerance Optimization: Balance availability and consistency guarantees

Technical Implementation

Core Quorum Management System

class QuorumManager {
  constructor(nodeId, consensusProtocol) {
    this.nodeId = nodeId;
    this.protocol = consensusProtocol;
    this.currentQuorum = new Map(); // nodeId -> QuorumNode
    this.quorumHistory = [];
    this.networkMonitor = new NetworkConditionMonitor();
    this.membershipTracker = new MembershipTracker();
    this.faultToleranceCalculator = new FaultToleranceCalculator();
    this.adjustmentStrategies = new Map();
    
    this.initializeStrategies();
  }

  // Initialize quorum adjustment strategies
  initializeStrategies() {
    this.adjustmentStrategies.set('NETWORK_BASED', new NetworkBasedStrategy());
    this.adjustmentStrategies.set('PERFORMANCE_BASED', new PerformanceBasedStrategy());
    this.adjustmentStrategies.set('FAULT_TOLERANCE_BASED', new FaultToleranceStrategy());
    this.adjustmentStrategies.set('HYBRID', new HybridStrategy());
  }

  // Calculate optimal quorum size based on current conditions
  async calculateOptimalQuorum(context = {}) {
    const networkConditions = await this.networkMonitor.getCurrentConditions();
    const membershipStatus = await this.membershipTracker.getMembershipStatus();
    const performanceMetrics = context.performanceMetrics || await this.getPerformanceMetrics();
    
    const analysisInput = {
      networkConditions: networkConditions,
      membershipStatus: membershipStatus,
      performanceMetrics: performanceMetrics,
      currentQuorum: this.currentQuorum,
      protocol: this.protocol,
      faultToleranceRequirements: context.faultToleranceRequirements || this.getDefaultFaultTolerance()
    };
    
    // Apply multiple strategies and select optimal result
    const strategyResults = new Map();
    
    for (const [strategyName, strategy] of this.adjustmentStrategies) {
      try {
        const result = await strategy.calculateQuorum(analysisInput);
        strategyResults.set(strategyName, result);
      } catch (error) {
        console.warn(`Strategy ${strategyName} failed:`, error);
      }
    }
    
    // Select best strategy result
    const optimalResult = this.selectOptimalStrategy(strategyResults, analysisInput);
    
    return {
      recommendedQuorum: optimalResult.quorum,
      strategy: optimalResult.strategy,
      confidence: optimalResult.confidence,
      reasoning: optimalResult.reasoning,
      expectedImpact: optimalResult.expectedImpact
    };
  }

  // Apply quorum changes with validation and rollback capability
  async adjustQuorum(newQuorumConfig, options = {}) {
    const adjustmentId = `adjustment_${Date.now()}`;
    
    try {
      // Validate new quorum configuration
      await this.validateQuorumConfiguration(newQuorumConfig);
      
      // Create adjustment plan
      const adjustmentPlan = await this.createAdjustmentPlan(
        this.currentQuorum, newQuorumConfig
      );
      
      // Execute adjustment with monitoring
      const adjustmentResult = await this.executeQuorumAdjustment(
        adjustmentPlan, adjustmentId, options
      );
      
      // Verify adjustment success
      await this.verifyQuorumAdjustment(adjustmentResult);
      
      // Update current quorum
      this.currentQuorum = newQuorumConfig.quorum;
      
      // Record successful adjustment
      this.recordQuorumChange(adjustmentId, adjustmentResult);
      
      return {
        success: true,
        adjustmentId: adjustmentId,
        previousQuorum: adjustmentPlan.previousQuorum,
        newQuorum: this.currentQuorum,
        impact: adjustmentResult.impact
      };
      
    } catch (error) {
      console.error(`Quorum adjustment failed:`, error);
      
      // Attempt rollback
      await this.rollbackQuorumAdjustment(adjustmentId);
      
      throw error;
    }
  }

  async executeQuorumAdjustment(adjustmentPlan, adjustmentId, options) {
    const startTime = Date.now();
    
    // Phase 1: Prepare nodes for quorum change
    await this.prepareNodesForAdjustment(adjustmentPlan.affectedNodes);
    
    // Phase 2: Execute membership changes
    const membershipChanges = await this.executeMembershipChanges(
      adjustmentPlan.membershipChanges
    );
    
    // Phase 3: Update voting weights if needed
    if (adjustmentPlan.weightChanges.length > 0) {
      await this.updateVotingWeights(adjustmentPlan.weightChanges);
    }
    
    // Phase 4: Reconfigure consensus protocol
    await this.reconfigureConsensusProtocol(adjustmentPlan.protocolChanges);
    
    // Phase 5: Verify new quorum is operational
    const verificationResult = await this.verifyQuorumOperational(adjustmentPlan.newQuorum);
    
    const endTime = Date.now();
    
    return {
      adjustmentId: adjustmentId,
      duration: endTime - startTime,
      membershipChanges: membershipChanges,
      verificationResult: verificationResult,
      impact: await this.measureAdjustmentImpact(startTime, endTime)
    };
  }
}

Network-Based Quorum Strategy

class NetworkBasedStrategy {
  constructor() {
    this.networkAnalyzer = new NetworkAnalyzer();
    this.connectivityMatrix = new ConnectivityMatrix();
    this.partitionPredictor = new PartitionPredictor();
  }

  async calculateQuorum(analysisInput) {
    const { networkConditions, membershipStatus, currentQuorum } = analysisInput;
    
    // Analyze network topology and connectivity
    const topologyAnalysis = await this.analyzeNetworkTopology(membershipStatus.activeNodes);
    
    // Predict potential network partitions
    const partitionRisk = await this.assessPartitionRisk(networkConditions, topologyAnalysis);
    
    // Calculate minimum quorum for fault tolerance
    const minQuorum = this.calculateMinimumQuorum(
      membershipStatus.activeNodes.length,
      partitionRisk.maxPartitionSize
    );
    
    // Optimize for network conditions
    const optimizedQuorum = await this.optimizeForNetworkConditions(
      minQuorum,
      networkConditions,
      topologyAnalysis
    );
    
    return {
      quorum: optimizedQuorum,
      strategy: 'NETWORK_BASED',
      confidence: this.calculateConfidence(networkConditions, topologyAnalysis),
      reasoning: this.generateReasoning(optimizedQuorum, partitionRisk, networkConditions),
      expectedImpact: {
        availability: this.estimateAvailabilityImpact(optimizedQuorum),
        performance: this.estimatePerformanceImpact(optimizedQuorum, networkConditions)
      }
    };
  }

  async analyzeNetworkTopology(activeNodes) {
    const topology = {
      nodes: activeNodes.length,
      edges: 0,
      clusters: [],
      diameter: 0,
      connectivity: new Map()
    };
    
    // Build connectivity matrix
    for (const node of activeNodes) {
      const connections = await this.getNodeConnections(node);
      topology.connectivity.set(node.id, connections);
      topology.edges += connections.length;
    }
    
    // Identify network clusters
    topology.clusters = await this.identifyNetworkClusters(topology.connectivity);
    
    // Calculate network diameter
    topology.diameter = await this.calculateNetworkDiameter(topology.connectivity);
    
    return topology;
  }

  async assessPartitionRisk(networkConditions, topologyAnalysis) {
    const riskFactors = {
      connectivityReliability: this.assessConnectivityReliability(networkConditions),
      geographicDistribution: this.assessGeographicRisk(topologyAnalysis),
      networkLatency: this.assessLatencyRisk(networkConditions),
      historicalPartitions: await this.getHistoricalPartitionData()
    };
    
    // Calculate overall partition risk
    const overallRisk = this.calculateOverallPartitionRisk(riskFactors);
    
    // Estimate maximum partition size
    const maxPartitionSize = this.estimateMaxPartitionSize(
      topologyAnalysis,
      riskFactors
    );
    
    return {
      overallRisk: overallRisk,
      maxPartitionSize: maxPartitionSize,
      riskFactors: riskFactors,
      mitigationStrategies: this.suggestMitigationStrategies(riskFactors)
    };
  }

  calculateMinimumQuorum(totalNodes, maxPartitionSize) {
    // For Byzantine fault tolerance: need > 2/3 of total nodes
    const byzantineMinimum = Math.floor(2 * totalNodes / 3) + 1;
    
    // For network partition tolerance: need > 1/2 of largest connected component
    const partitionMinimum = Math.floor((totalNodes - maxPartitionSize) / 2) + 1;
    
    // Use the more restrictive requirement
    return Math.max(byzantineMinimum, partitionMinimum);
  }

  async optimizeForNetworkConditions(minQuorum, networkConditions, topologyAnalysis) {
    const optimization = {
      baseQuorum: minQuorum,
      nodes: new Map(),
      t

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