agent-crdt-synchronizer

name	agent-crdt-synchronizer
description	Agent skill for crdt-synchronizer - invoke with $agent-crdt-synchronizer

---

name: crdt-synchronizer type: synchronizer color: "#4CAF50" description: Implements Conflict-free Replicated Data Types for eventually consistent state synchronization capabilities:

• state_based_crdts
• operation_based_crdts
• delta_synchronization
• conflict_resolution
• causal_consistency priority: high hooks: pre: | echo "🔄 CRDT Synchronizer syncing: $TASK"

  Initialize CRDT state tracking

  if [[ "$TASK" == "synchronization" ]]; then echo "📊 Preparing delta state computation" fi post: | echo "🎯 CRDT synchronization complete"

  Verify eventual consistency

  echo "✅ Validating conflict-free state convergence"

---

CRDT Synchronizer

Implements Conflict-free Replicated Data Types for eventually consistent distributed state synchronization.

Core Responsibilities

1. CRDT Implementation: Deploy state-based and operation-based conflict-free data types
2. Data Structure Management: Handle counters, sets, registers, and composite structures
3. Delta Synchronization: Implement efficient incremental state updates
4. Conflict Resolution: Ensure deterministic conflict-free merge operations
5. Causal Consistency: Maintain proper ordering of causally related operations

Technical Implementation

Base CRDT Framework

class CRDTSynchronizer {
  constructor(nodeId, replicationGroup) {
    this.nodeId = nodeId;
    this.replicationGroup = replicationGroup;
    this.crdtInstances = new Map();
    this.vectorClock = new VectorClock(nodeId);
    this.deltaBuffer = new Map();
    this.syncScheduler = new SyncScheduler();
    this.causalTracker = new CausalTracker();
  }

  // Register CRDT instance
  registerCRDT(name, crdtType, initialState = null) {
    const crdt = this.createCRDTInstance(crdtType, initialState);
    this.crdtInstances.set(name, crdt);
    
    // Subscribe to CRDT changes for delta tracking
    crdt.onUpdate((delta) => {
      this.trackDelta(name, delta);
    });
    
    return crdt;
  }

  // Create specific CRDT instance
  createCRDTInstance(type, initialState) {
    switch (type) {
      case 'G_COUNTER':
        return new GCounter(this.nodeId, this.replicationGroup, initialState);
      case 'PN_COUNTER':
        return new PNCounter(this.nodeId, this.replicationGroup, initialState);
      case 'OR_SET':
        return new ORSet(this.nodeId, initialState);
      case 'LWW_REGISTER':
        return new LWWRegister(this.nodeId, initialState);
      case 'OR_MAP':
        return new ORMap(this.nodeId, this.replicationGroup, initialState);
      case 'RGA':
        return new RGA(this.nodeId, initialState);
      default:
        throw new Error(`Unknown CRDT type: ${type}`);
    }
  }

  // Synchronize with peer nodes
  async synchronize(peerNodes = null) {
    const targets = peerNodes || Array.from(this.replicationGroup);
    
    for (const peer of targets) {
      if (peer !== this.nodeId) {
        await this.synchronizeWithPeer(peer);
      }
    }
  }

  async synchronizeWithPeer(peerNode) {
    // Get current state and deltas
    const localState = this.getCurrentState();
    const deltas = this.getDeltasSince(peerNode);
    
    // Send sync request
    const syncRequest = {
      type: 'CRDT_SYNC_REQUEST',
      sender: this.nodeId,
      vectorClock: this.vectorClock.clone(),
      state: localState,
      deltas: deltas
    };
    
    try {
      const response = await this.sendSyncRequest(peerNode, syncRequest);
      await this.processSyncResponse(response);
    } catch (error) {
      console.error(`Sync failed with ${peerNode}:`, error);
    }
  }
}

G-Counter Implementation

class GCounter {
  constructor(nodeId, replicationGroup, initialState = null) {
    this.nodeId = nodeId;
    this.replicationGroup = replicationGroup;
    this.payload = new Map();
    
    // Initialize counters for all nodes
    for (const node of replicationGroup) {
      this.payload.set(node, 0);
    }
    
    if (initialState) {
      this.merge(initialState);
    }
    
    this.updateCallbacks = [];
  }

  // Increment operation (can only be performed by owner node)
  increment(amount = 1) {
    if (amount < 0) {
      throw new Error('G-Counter only supports positive increments');
    }
    
    const oldValue = this.payload.get(this.nodeId) || 0;
    const newValue = oldValue + amount;
    this.payload.set(this., newValue);
    
    
    .({
      : ,
      : .,
      : oldValue,
      : newValue,
      : amount
    });
    
     newValue;
  }

  
  () {
     .(..()).( sum + val, );
  }

  
  () {
     changed = ;
    
     ( [node, otherValue]  otherState.) {
       currentValue = ..(node) || ;
       (otherValue > currentValue) {
        ..(node, otherValue);
        changed = ;
      }
    }
    
     (changed) {
      .({
        : ,
        : otherState
      });
    }
  }

  
  () {
     ( [node, otherValue]  otherState.) {
       currentValue = ..(node) || ;
       (currentValue < otherValue) {
         ;
      }   (currentValue > otherValue) {
         ;
      }
    }
     ;
  }

  
  () {
     newCounter =  (., .);
    newCounter. =  (.);
     newCounter;
  }

  () {
    ..(callback);
  }

  () {
    ..( (delta));
  }
}

OR-Set Implementation

class ORSet {
  constructor(nodeId, initialState = null) {
    this.nodeId = nodeId;
    this.elements = new Map(); // element -> Set of unique tags
    this.tombstones = new Set(); // removed element tags
    this.tagCounter = 0;
    
    if (initialState) {
      this.merge(initialState);
    }
    
    this.updateCallbacks = [];
  }

  // Add element to set
  add(element) {
    const tag = this.generateUniqueTag();
    
    if (!this.elements.has(element)) {
      this.elements.set(element, new Set());
    }
    
    this.elements.get(element).add(tag);
    
    this.notifyUpdate({
      type: 'ADD',
      element: element,
      : tag
    });
    
     tag;
  }

  
  () {
     (!..(element)) {
       ; 
    }
    
     tags = ..(element);
     removedTags = [];
    
    
     ( tag  tags) {
      ..(tag);
      removedTags.(tag);
    }
    
    .({
      : ,
      : element,
      : removedTags
    });
    
     ;
  }

  
  () {
     (!..(element)) {
       ;
    }
    
     tags = ..(element);
    
    
     ( tag  tags) {
       (!..(tag)) {
         ;
      }
    }
    
     ;
  }

  
  () {
     result =  ();
    
     ( [element, tags]  .) {
      
       ( tag  tags) {
         (!..(tag)) {
          result.(element);
          ;
        }
      }
    }
    
     result;
  }

  
  () {
     changed = ;
    
    
     ( [element, otherTags]  otherState.) {
       (!..(element)) {
        ..(element,  ());
      }
      
       currentTags = ..(element);
      
       ( tag  otherTags) {
         (!currentTags.(tag)) {
          currentTags.(tag);
          changed = ;
        }
      }
    }
    
    
     ( tombstone  otherState.) {
       (!..(tombstone)) {
        ..(tombstone);
        changed = ;
      }
    }
    
     (changed) {
      .({
        : ,
        : otherState
      });
    }
  }

  () {
     ;
  }

  () {
    ..(callback);
  }

  () {
    ..( (delta));
  }
}

LWW-Register Implementation

class LWWRegister {
  constructor(nodeId, initialValue = null) {
    this.nodeId = nodeId;
    this.value = initialValue;
    this.timestamp = initialValue ? Date.now() : 0;
    this.vectorClock = new VectorClock(nodeId);
    this.updateCallbacks = [];
  }

  // Set new value with timestamp
  set(newValue, timestamp = null) {
    const ts = timestamp || Date.now();
    
    if (ts > this.timestamp || 
        (ts === this.timestamp && this.nodeId > this.getLastWriter())) {
      const oldValue = this.value;
      this.value = newValue;
      this.timestamp = ts;
      this.vectorClock.increment();
      
      this.notifyUpdate({
        : ,
        : oldValue,
        : newValue,
        : ts
      });
    }
  }

  
  () {
     .;
  }

  
  () {
     (otherRegister. > . ||
        (otherRegister. === . && 
         otherRegister. > .)) {
      
       oldValue = .;
      . = otherRegister.;
      . = otherRegister.;
      
      .({
        : ,
        : oldValue,
        : .,
        : otherRegister
      });
    }
    
    
    ..(otherRegister.);
  }

  () {
    
     .;
  }

  () {
    ..(callback);
  }

  () {
    ..( (delta));
  }
}

RGA (Replicated Growable Array) Implementation

class RGA {
  constructor(nodeId, initialSequence = []) {
    this.nodeId = nodeId;
    this.sequence = [];
    this.tombstones = new Set();
    this.vertexCounter = 0;
    
    // Initialize with sequence
    for (const element of initialSequence) {
      this.insert(this.sequence.length, element);
    }
    
    this.updateCallbacks = [];
  }

  // Insert element at position
  insert(position, element) {
    const vertex = this.createVertex(element, position);
    
    // Find insertion point based on causal ordering
    const insertionIndex = this.findInsertionIndex(vertex, position);
    
    this.sequence.splice(insertionIndex, 0, vertex);
    
    this.notifyUpdate({
      type: 'INSERT',
      position: insertionIndex,
      element: element,
      : vertex
    });
    
     vertex.;
  }

  
  () {
     (position <  || position >= .()) {
        ();
    }
    
     visibleVertex = .(position);
     (visibleVertex) {
      ..(visibleVertex.);
      
      .({
        : ,
        : position,
        : visibleVertex
      });
      
       ;
    }
    
     ;
  }

  
  () {
     .
      .( !..(vertex.))
      .( vertex.);
  }

  
  () {
     ..( !..(vertex.)).;
  }

  
  () {
     changed = ;
    
    
     mergedSequence = .(., otherRGA.);
     (mergedSequence. !== ..) {
      . = mergedSequence;
      changed = ;
    }
    
    
     ( tombstone  otherRGA.) {
       (!..(tombstone)) {
        ..(tombstone);
        changed = ;
      }
    }
    
     (changed) {
      .({
        : ,
        : otherRGA
      });
    }
  }

  () {
     leftVertex = position >  ? .(position - ) : ;
    
     {
      : ,
      : element,
      : leftVertex ? leftVertex. : ,
      : .(),
      : .
    };
  }

  () {
    
    
     visibleCount = ;
    
     ( i = ; i < ..; i++) {
       (!..(.[i].)) {
         (visibleCount === targetPosition) {
           i;
        }
        visibleCount++;
      }
    }
    
     ..;
  }

  () {
     visibleCount = ;
    
     ( vertex  .) {
       (!..(vertex.)) {
         (visibleCount === position) {
           vertex;
        }
        visibleCount++;
      }
    }
    
     ;
  }

  () {
    
    
     merged = [...seq1];
    
     ( vertex  seq2) {
       (!merged.( v. === vertex.)) {
        merged.(vertex);
      }
    }
    
    
     merged.( a. - b.);
  }

  () {
    ..(callback);
  }

  () {
    ..( (delta));
  }
}

Delta-State CRDT Framework

class DeltaStateCRDT {
  constructor(baseCRDT) {
    this.baseCRDT = baseCRDT;
    this.deltaBuffer = [];
    this.lastSyncVector = new Map();
    this.maxDeltaBuffer = 1000;
  }

  // Apply operation and track delta
  applyOperation(operation) {
    const oldState = this.baseCRDT.clone();
    const result = this.baseCRDT.applyOperation(operation);
    const newState = this.baseCRDT.clone();
    
    // Compute delta
    const delta = this.computeDelta(oldState, newState);
    this.addDelta(delta);
    
    return result;
  }

  // Add delta to buffer
  addDelta(delta) {
    this.deltaBuffer.push({
      delta: delta,
      timestamp: Date.now(),
      vectorClock: ...()
    });
    
    
     (.. > .) {
      ..();
    }
  }

  
  () {
     lastSync = ..(peerNode) ||  ();
    
     ..( 
      deltaEntry..(lastSync)
    );
  }

  
  () {
     sortedDeltas = .(deltas);
    
     ( delta  sortedDeltas) {
      ..(delta.);
    }
  }

  
  () {
    
    
     {
      : ,
      : .(oldState, newState)
    };
  }

  () {
    
     deltas.( {
       (a..(b.))  -;
       (b..(a.))  ;
       ;
    });
  }

  
  () {
     cutoffTime = .() - ( *  *  * ); 
    
    . = ..(
       deltaEntry. > cutoffTime
    );
  }
}

MCP Integration Hooks

Memory Coordination for CRDT State

// Store CRDT state persistently
await this.mcpTools.memory_usage({
  action: 'store',
  key: `crdt_state_${this.crdtName}`,
  value: JSON.stringify({
    type: this.crdtType,
    state: this.serializeState(),
    vectorClock: Array.from(this.vectorClock.entries()),
    lastSync: Array.from(this.lastSyncVector.entries())
  }),
  namespace: 'crdt_synchronization',
  ttl: 0 // Persistent
});

// Coordinate delta synchronization
await this.mcpTools.memory_usage({
  action: 'store',
  key: `deltas_${this.nodeId}_${Date.now()}`,
  value: JSON.(.()),
  : ,
  :  
});

Performance Monitoring

// Track CRDT synchronization metrics
await this.mcpTools.metrics_collect({
  components: [
    'crdt_merge_time',
    'delta_generation_time',
    'sync_convergence_time',
    'memory_usage_per_crdt'
  ]
});

// Neural pattern learning for sync optimization
await this.mcpTools.neural_patterns({
  action: 'learn',
  operation: 'crdt_sync_optimization',
  outcome: JSON.stringify({
    syncPattern: this.lastSyncPattern,
    convergenceTime: this.lastConvergenceTime,
    networkTopology: this.networkState
  })
});

Advanced CRDT Features

Causal Consistency Tracker

class CausalTracker {
  constructor(nodeId) {
    this.nodeId = nodeId;
    this.vectorClock = new VectorClock(nodeId);
    this.causalBuffer = new Map();
    this.deliveredEvents = new Set();
  }

  // Track causal dependencies
  trackEvent(event) {
    event.vectorClock = this.vectorClock.clone();
    this.vectorClock.increment();
    
    // Check if event can be delivered
    if (this.canDeliver(event)) {
      this.deliverEvent(event);
      this.checkBufferedEvents();
    } else {
      this.bufferEvent(event);
    }
  }

  canDeliver(event) {
    // Event can be delivered if all its causal dependencies are satisfied
    for (const [nodeId, clock] of event.vectorClock.entries()) {
       (nodeId === event.) {
        
         (clock !== ..(nodeId) + ) {
           ;
        }
      }  {
        
         (clock > ..(nodeId)) {
           ;
        }
      }
    }
     ;
  }

  () {
     (!..(event.)) {
      
      ..(event.);
      
      
      ..(event.);
      
      
      .(event);
    }
  }

  () {
     (!..(event.)) {
      ..(event., event);
    }
  }

  () {
     deliverable = [];
    
     ( [eventId, event]  .) {
       (.(event)) {
        deliverable.(event);
      }
    }
    
    
     ( event  deliverable) {
      ..(event.);
      .(event);
    }
  }
}

CRDT Composition Framework

class CRDTComposer {
  constructor() {
    this.compositeTypes = new Map();
    this.transformations = new Map();
  }

  // Define composite CRDT structure
  defineComposite(name, schema) {
    this.compositeTypes.set(name, {
      schema: schema,
      factory: (nodeId, replicationGroup) => 
        this.createComposite(schema, nodeId, replicationGroup)
    });
  }

  createComposite(schema, nodeId, replicationGroup) {
    const composite = new CompositeCRDT(nodeId, replicationGroup);
    
    for (const [fieldName, fieldSpec] of Object.entries(schema)) {
      const fieldCRDT = this.createFieldCRDT(fieldSpec, nodeId, replicationGroup);
      composite.addField(fieldName, fieldCRDT);
    }
    
    return composite;
  }

  createFieldCRDT(fieldSpec, nodeId, replicationGroup) {
    switch (fieldSpec.type) {
      case 'counter':
         fieldSpec. ? 
           (nodeId, replicationGroup) :
           (nodeId, replicationGroup);
       :
          (nodeId);
       :
          (nodeId);
       :
          (nodeId, replicationGroup, fieldSpec.);
       :
          (nodeId);
      :
          ();
    }
  }
}

  {
  () {
    . = nodeId;
    . = replicationGroup;
    . =  ();
    . = [];
  }

  () {
    ..(name, crdt);
    
    
    crdt.( {
      .({
        : ,
        : name,
        : delta
      });
    });
  }

  () {
     ..(name);
  }

  () {
     changed = ;
    
     ( [fieldName, fieldCRDT]  .) {
       otherField = otherComposite..(fieldName);
       (otherField) {
         oldState = fieldCRDT.();
        fieldCRDT.(otherField);
        
         (!.(oldState, fieldCRDT)) {
          changed = ;
        }
      }
    }
    
     (changed) {
      .({
        : ,
        : otherComposite
      });
    }
  }

  () {
     serialized = {};
    
     ( [fieldName, fieldCRDT]  .) {
      serialized[fieldName] = fieldCRDT.();
    }
    
     serialized;
  }

  () {
    ..(callback);
  }

  () {
    ..( (delta));
  }
}

Integration with Consensus Protocols

CRDT-Enhanced Consensus

class CRDTConsensusIntegrator {
  constructor(consensusProtocol, crdtSynchronizer) {
    this.consensus = consensusProtocol;
    this.crdt = crdtSynchronizer;
    this.hybridOperations = new Map();
  }

  // Hybrid operation: consensus for ordering, CRDT for state
  async hybridUpdate(operation) {
    // Step 1: Achieve consensus on operation ordering
    const consensusResult = await this.consensus.propose({
      type: 'CRDT_OPERATION',
      operation: operation,
      timestamp: Date.now()
    });
    
    if (consensusResult.committed) {
      // Step 2: Apply operation to CRDT with consensus-determined order
      const orderedOperation = {
        ...operation,
        consensusIndex: consensusResult.index,
        globalTimestamp: consensusResult.timestamp
      };
      
      await this.crdt.applyOrderedOperation(orderedOperation);
      
      return {
        success: true,
        consensusIndex: consensusResult.,
        : ..()
      };
    }
    
     { : , :  };
  }

  
   () {
     ..(key);
  }

  
   () {
    
     consensusState =  ..();
     crdtState = ..();
    
     (.(consensusState, crdtState)) {
       ..(key);
    }  {
      
       .(consensusState, crdtState);
       ..(key);
    }
  }
}

This CRDT Synchronizer provides comprehensive support for conflict-free replicated data types, enabling eventually consistent distributed state management that complements consensus protocols for different consistency requirements.