fix(parallel): variable resolution in collection

apps/sim/executor/execution/edge-manager.ts

@@ -86,6 +86,27 @@ export class EdgeManager {
     this.deactivatedEdges.clear()
   }
 
+  /**
+   * Clear deactivated edges for a set of nodes (used when restoring loop state for next iteration).
+   * This ensures error/success edges can be re-evaluated on each iteration.
+   */
+  clearDeactivatedEdgesForNodes(nodeIds: Set<string>): void {
+    const edgesToRemove: string[] = []
+    for (const edgeKey of this.deactivatedEdges) {
+      // Edge key format is "sourceId-targetId-handle"
+      // Check if either source or target is in the nodeIds set
+      for (const nodeId of nodeIds) {
+        if (edgeKey.startsWith(`${nodeId}-`) || edgeKey.includes(`-${nodeId}-`)) {
+          edgesToRemove.push(edgeKey)
+          break
+        }
+      }
+    }
+    for (const edgeKey of edgesToRemove) {
+      this.deactivatedEdges.delete(edgeKey)
+    }
+  }
+
   private shouldActivateEdge(edge: DAGEdge, output: NormalizedBlockOutput): boolean {
     const handle = edge.sourceHandle
 
@@ -180,7 +201,7 @@ export class EdgeManager {
       const sourceNode = this.dag.nodes.get(sourceId)
       if (!sourceNode) continue
 
-      for (const [_, edge] of sourceNode.outgoingEdges) {
+      for (const [, edge] of sourceNode.outgoingEdges) {
         if (edge.target === node.id) {
           const edgeKey = this.createEdgeKey(sourceId, edge.target, edge.sourceHandle)
           if (!this.deactivatedEdges.has(edgeKey)) {

apps/sim/executor/execution/engine.ts

@@ -279,6 +279,14 @@ export class ExecutionEngine {
     })
 
     this.addMultipleToQueue(readyNodes)
+
+    // Check for dynamically added nodes (e.g., from parallel expansion)
+    if (this.context.pendingDynamicNodes && this.context.pendingDynamicNodes.length > 0) {
+      const dynamicNodes = this.context.pendingDynamicNodes
+      this.context.pendingDynamicNodes = []
+      logger.info('Adding dynamically expanded parallel nodes', { dynamicNodes })
+      this.addMultipleToQueue(dynamicNodes)
+    }
   }
 
   private buildPausedResult(startTime: number): ExecutionResult {

apps/sim/executor/execution/executor.ts

@@ -64,9 +64,11 @@ export class DAGExecutor {
     const resolver = new VariableResolver(this.workflow, this.workflowVariables, state)
     const loopOrchestrator = new LoopOrchestrator(dag, state, resolver)
     const parallelOrchestrator = new ParallelOrchestrator(dag, state)
+    parallelOrchestrator.setResolver(resolver)
     const allHandlers = createBlockHandlers()
     const blockExecutor = new BlockExecutor(allHandlers, resolver, this.contextExtensions, state)
     const edgeManager = new EdgeManager(dag)
+    loopOrchestrator.setEdgeManager(edgeManager)
     const nodeOrchestrator = new NodeExecutionOrchestrator(
       dag,
       state,

apps/sim/executor/execution/state.ts

@@ -22,6 +22,7 @@ export interface ParallelScope {
   branchOutputs: Map<number, NormalizedBlockOutput[]>
   completedCount: number
   totalExpectedNodes: number
+  items?: any[]
 }
 
 export class ExecutionState implements BlockStateController {

apps/sim/executor/orchestrators/loop.ts

@@ -1,6 +1,7 @@
 import { createLogger } from '@/lib/logs/console/logger'
 import { buildLoopIndexCondition, DEFAULTS, EDGE } from '@/executor/constants'
 import type { DAG } from '@/executor/dag/builder'
+import type { EdgeManager } from '@/executor/execution/edge-manager'
 import type { LoopScope } from '@/executor/execution/state'
 import type { BlockStateController } from '@/executor/execution/types'
 import type { ExecutionContext, NormalizedBlockOutput } from '@/executor/types'
@@ -26,12 +27,18 @@ export interface LoopContinuationResult {
 }
 
 export class LoopOrchestrator {
+  private edgeManager: EdgeManager | null = null
+
   constructor(
     private dag: DAG,
     private state: BlockStateController,
     private resolver: VariableResolver
   ) {}
 
+  setEdgeManager(edgeManager: EdgeManager): void {
+    this.edgeManager = edgeManager
+  }
+
   initializeLoopScope(ctx: ExecutionContext, loopId: string): LoopScope {
     const loopConfig = this.dag.loopConfigs.get(loopId) as SerializedLoop | undefined
     if (!loopConfig) {
@@ -216,23 +223,26 @@ export class LoopOrchestrator {
     const loopNodes = loopConfig.nodes
     const allLoopNodeIds = new Set([sentinelStartId, sentinelEndId, ...loopNodes])
 
-    let restoredCount = 0
+    // Clear deactivated edges for loop nodes so error/success edges can be re-evaluated
+    if (this.edgeManager) {
+      this.edgeManager.clearDeactivatedEdgesForNodes(allLoopNodeIds)
+    }
+
     for (const nodeId of allLoopNodeIds) {
       const nodeToRestore = this.dag.nodes.get(nodeId)
       if (!nodeToRestore) continue
 
       for (const [potentialSourceId, potentialSourceNode] of this.dag.nodes) {
         if (!allLoopNodeIds.has(potentialSourceId)) continue
 
-        for (const [_, edge] of potentialSourceNode.outgoingEdges) {
+        for (const [, edge] of potentialSourceNode.outgoingEdges) {
           if (edge.target === nodeId) {
             const isBackwardEdge =
               edge.sourceHandle === EDGE.LOOP_CONTINUE ||
               edge.sourceHandle === EDGE.LOOP_CONTINUE_ALT
 
             if (!isBackwardEdge) {
               nodeToRestore.incomingEdges.add(potentialSourceId)
-              restoredCount++
             }
           }
         }

apps/sim/executor/orchestrators/node.ts

@@ -53,6 +53,20 @@ export class NodeExecutionOrchestrator {
       }
     }
 
+    // Initialize parallel scope BEFORE execution so <parallel.currentItem> can be resolved
+    const parallelId = node.metadata.parallelId
+    if (parallelId && !this.parallelOrchestrator.getParallelScope(ctx, parallelId)) {
+      const totalBranches = node.metadata.branchTotal || 1
+      const parallelConfig = this.dag.parallelConfigs.get(parallelId)
+      const nodesInParallel = (parallelConfig as any)?.nodes?.length || 1
+      this.parallelOrchestrator.initializeParallelScope(
+        ctx,
+        parallelId,
+        totalBranches,
+        nodesInParallel
+      )
+    }
+
     if (node.metadata.isSentinel) {
       const output = this.handleSentinel(ctx, node)
       const isFinalOutput = node.outgoingEdges.size === 0