fix(executor): condition inside parallel

apps/sim/executor/handlers/condition/condition-handler.test.ts

@@ -322,7 +322,8 @@ describe('ConditionBlockHandler', () => {
 
     await handler.execute(mockContext, mockBlock, inputs)
 
-    expect(mockCollectBlockData).toHaveBeenCalledWith(mockContext)
+    // collectBlockData is now called with the current node ID for parallel branch context
+    expect(mockCollectBlockData).toHaveBeenCalledWith(mockContext, mockBlock.id)
   })
 
   it('should handle function_execute tool failure', async () => {
@@ -620,4 +621,248 @@ describe('ConditionBlockHandler', () => {
       expect(mockContext.decisions.condition.has(mockBlock.id)).toBe(false)
     })
   })
+
+  describe('Parallel branch handling', () => {
+    it('should resolve connections and block data correctly when inside a parallel branch', async () => {
+      // Simulate a condition block inside a parallel branch
+      // Virtual block ID uses subscript notation: blockId₍branchIndex₎
+      const parallelConditionBlock: SerializedBlock = {
+        id: 'cond-block-1₍0₎', // Virtual ID for branch 0
+        metadata: { id: 'condition', name: 'Condition' },
+        position: { x: 0, y: 0 },
+        config: {},
+      }
+
+      // Source block also has a virtual ID in the same branch
+      const sourceBlockVirtualId = 'agent-block-1₍0₎'
+
+      // Set up workflow with connections using BASE block IDs (as they are in the workflow definition)
+      const parallelWorkflow: SerializedWorkflow = {
+        blocks: [
+          {
+            id: 'agent-block-1',
+            metadata: { id: 'agent', name: 'Agent' },
+            position: { x: 0, y: 0 },
+            config: {},
+          },
+          {
+            id: 'cond-block-1',
+            metadata: { id: 'condition', name: 'Condition' },
+            position: { x: 100, y: 0 },
+            config: {},
+          },
+          {
+            id: 'target-block-1',
+            metadata: { id: 'api', name: 'Target' },
+            position: { x: 200, y: 0 },
+            config: {},
+          },
+        ],
+        connections: [
+          // Connections use base IDs, not virtual IDs
+          { source: 'agent-block-1', target: 'cond-block-1' },
+          { source: 'cond-block-1', target: 'target-block-1', sourceHandle: 'condition-cond1' },
+        ],
+        loops: [],
+        parallels: [],
+      }
+
+      // Block states use virtual IDs (as outputs are stored per-branch)
+      const parallelBlockStates = new Map<string, BlockState>([
+        [
+          sourceBlockVirtualId,
+          { output: { response: 'hello from branch 0', success: true }, executed: true },
+        ],
+      ])
+
+      const parallelContext: ExecutionContext = {
+        workflowId: 'test-workflow-id',
+        workspaceId: 'test-workspace-id',
+        workflow: parallelWorkflow,
+        blockStates: parallelBlockStates,
+        blockLogs: [],
+        completedBlocks: new Set(),
+        decisions: {
+          router: new Map(),
+          condition: new Map(),
+        },
+        environmentVariables: {},
+        workflowVariables: {},
+      }
+
+      const conditions = [
+        { id: 'cond1', title: 'if', value: 'context.response === "hello from branch 0"' },
+        { id: 'else1', title: 'else', value: '' },
+      ]
+      const inputs = { conditions: JSON.stringify(conditions) }
+
+      const result = await handler.execute(parallelContext, parallelConditionBlock, inputs)
+
+      // The condition should evaluate to true because:
+      // 1. Connection lookup uses base ID 'cond-block-1' (extracted from 'cond-block-1₍0₎')
+      // 2. Source block output is found at virtual ID 'agent-block-1₍0₎' (same branch)
+      // 3. The evaluation context contains { response: 'hello from branch 0' }
+      expect((result as any).conditionResult).toBe(true)
+      expect((result as any).selectedOption).toBe('cond1')
+      expect((result as any).selectedPath).toEqual({
+        blockId: 'target-block-1',
+        blockType: 'api',
+        blockTitle: 'Target',
+      })
+    })
+
+    it('should find correct source block output in parallel branch context', async () => {
+      // Test that when multiple branches exist, the correct branch output is used
+      const parallelConditionBlock: SerializedBlock = {
+        id: 'cond-block-1₍1₎', // Virtual ID for branch 1
+        metadata: { id: 'condition', name: 'Condition' },
+        position: { x: 0, y: 0 },
+        config: {},
+      }
+
+      const parallelWorkflow: SerializedWorkflow = {
+        blocks: [
+          {
+            id: 'agent-block-1',
+            metadata: { id: 'agent', name: 'Agent' },
+            position: { x: 0, y: 0 },
+            config: {},
+          },
+          {
+            id: 'cond-block-1',
+            metadata: { id: 'condition', name: 'Condition' },
+            position: { x: 100, y: 0 },
+            config: {},
+          },
+          {
+            id: 'target-block-1',
+            metadata: { id: 'api', name: 'Target' },
+            position: { x: 200, y: 0 },
+            config: {},
+          },
+        ],
+        connections: [
+          { source: 'agent-block-1', target: 'cond-block-1' },
+          { source: 'cond-block-1', target: 'target-block-1', sourceHandle: 'condition-cond1' },
+        ],
+        loops: [],
+        parallels: [],
+      }
+
+      // Multiple branches have executed - each has different output
+      const parallelBlockStates = new Map<string, BlockState>([
+        ['agent-block-1₍0₎', { output: { value: 10 }, executed: true }],
+        ['agent-block-1₍1₎', { output: { value: 25 }, executed: true }], // Branch 1 has value 25
+        ['agent-block-1₍2₎', { output: { value: 5 }, executed: true }],
+      ])
+
+      const parallelContext: ExecutionContext = {
+        workflowId: 'test-workflow-id',
+        workspaceId: 'test-workspace-id',
+        workflow: parallelWorkflow,
+        blockStates: parallelBlockStates,
+        blockLogs: [],
+        completedBlocks: new Set(),
+        decisions: {
+          router: new Map(),
+          condition: new Map(),
+        },
+        environmentVariables: {},
+        workflowVariables: {},
+      }
+
+      // Condition checks if value > 20 - should be true for branch 1 (value=25)
+      const conditions = [
+        { id: 'cond1', title: 'if', value: 'context.value > 20' },
+        { id: 'else1', title: 'else', value: '' },
+      ]
+      const inputs = { conditions: JSON.stringify(conditions) }
+
+      const result = await handler.execute(parallelContext, parallelConditionBlock, inputs)
+
+      // Should evaluate using branch 1's data (value=25), not branch 0 (value=10) or branch 2 (value=5)
+      expect((result as any).conditionResult).toBe(true)
+      expect((result as any).selectedOption).toBe('cond1')
+    })
+
+    it('should fall back to else when condition is false in parallel branch', async () => {
+      const parallelConditionBlock: SerializedBlock = {
+        id: 'cond-block-1₍2₎', // Virtual ID for branch 2
+        metadata: { id: 'condition', name: 'Condition' },
+        position: { x: 0, y: 0 },
+        config: {},
+      }
+
+      const parallelWorkflow: SerializedWorkflow = {
+        blocks: [
+          {
+            id: 'agent-block-1',
+            metadata: { id: 'agent', name: 'Agent' },
+            position: { x: 0, y: 0 },
+            config: {},
+          },
+          {
+            id: 'cond-block-1',
+            metadata: { id: 'condition', name: 'Condition' },
+            position: { x: 100, y: 0 },
+            config: {},
+          },
+          {
+            id: 'target-true',
+            metadata: { id: 'api', name: 'True Path' },
+            position: { x: 200, y: 0 },
+            config: {},
+          },
+          {
+            id: 'target-false',
+            metadata: { id: 'api', name: 'False Path' },
+            position: { x: 200, y: 100 },
+            config: {},
+          },
+        ],
+        connections: [
+          { source: 'agent-block-1', target: 'cond-block-1' },
+          { source: 'cond-block-1', target: 'target-true', sourceHandle: 'condition-cond1' },
+          { source: 'cond-block-1', target: 'target-false', sourceHandle: 'condition-else1' },
+        ],
+        loops: [],
+        parallels: [],
+      }
+
+      const parallelBlockStates = new Map<string, BlockState>([
+        ['agent-block-1₍0₎', { output: { value: 100 }, executed: true }],
+        ['agent-block-1₍1₎', { output: { value: 50 }, executed: true }],
+        ['agent-block-1₍2₎', { output: { value: 5 }, executed: true }], // Branch 2 has value 5
+      ])
+
+      const parallelContext: ExecutionContext = {
+        workflowId: 'test-workflow-id',
+        workspaceId: 'test-workspace-id',
+        workflow: parallelWorkflow,
+        blockStates: parallelBlockStates,
+        blockLogs: [],
+        completedBlocks: new Set(),
+        decisions: {
+          router: new Map(),
+          condition: new Map(),
+        },
+        environmentVariables: {},
+        workflowVariables: {},
+      }
+
+      // Condition checks if value > 20 - should be false for branch 2 (value=5)
+      const conditions = [
+        { id: 'cond1', title: 'if', value: 'context.value > 20' },
+        { id: 'else1', title: 'else', value: '' },
+      ]
+      const inputs = { conditions: JSON.stringify(conditions) }
+
+      const result = await handler.execute(parallelContext, parallelConditionBlock, inputs)
+
+      // Should fall back to else path because branch 2's value (5) is not > 20
+      expect((result as any).conditionResult).toBe(true)
+      expect((result as any).selectedOption).toBe('else1')
+      expect((result as any).selectedPath.blockId).toBe('target-false')
+    })
+  })
 })

apps/sim/executor/handlers/condition/condition-handler.ts

@@ -3,6 +3,12 @@ import type { BlockOutput } from '@/blocks/types'
 import { BlockType, CONDITION, DEFAULTS, EDGE } from '@/executor/constants'
 import type { BlockHandler, ExecutionContext } from '@/executor/types'
 import { collectBlockData } from '@/executor/utils/block-data'
+import {
+  buildBranchNodeId,
+  extractBaseBlockId,
+  extractBranchIndex,
+  isBranchNodeId,
+} from '@/executor/utils/subflow-utils'
 import type { SerializedBlock } from '@/serializer/types'
 import { executeTool } from '@/tools'
 
@@ -18,15 +24,16 @@ const CONDITION_TIMEOUT_MS = 5000
 export async function evaluateConditionExpression(
   ctx: ExecutionContext,
   conditionExpression: string,
-  providedEvalContext?: Record<string, any>
+  providedEvalContext?: Record<string, any>,
+  currentNodeId?: string
 ): Promise<boolean> {
   const evalContext = providedEvalContext || {}
 
   try {
     const contextSetup = `const context = ${JSON.stringify(evalContext)};`
     const code = `${contextSetup}\nreturn Boolean(${conditionExpression})`
 
-    const { blockData, blockNameMapping, blockOutputSchemas } = collectBlockData(ctx)
+    const { blockData, blockNameMapping, blockOutputSchemas } = collectBlockData(ctx, currentNodeId)
 
     const result = await executeTool(
       'function_execute',
@@ -83,21 +90,36 @@ export class ConditionBlockHandler implements BlockHandler {
   ): Promise<BlockOutput> {
     const conditions = this.parseConditions(inputs.conditions)
 
-    const sourceBlockId = ctx.workflow?.connections.find((conn) => conn.target === block.id)?.source
+    const baseBlockId = extractBaseBlockId(block.id)
+    const branchIndex = isBranchNodeId(block.id) ? extractBranchIndex(block.id) : null
+
+    const sourceConnection = ctx.workflow?.connections.find((conn) => conn.target === baseBlockId)
+    let sourceBlockId = sourceConnection?.source
+
+    if (sourceBlockId && branchIndex !== null) {
+      const virtualSourceId = buildBranchNodeId(sourceBlockId, branchIndex)
+      if (ctx.blockStates.has(virtualSourceId)) {
+        sourceBlockId = virtualSourceId
+      }
+    }
+
     const evalContext = this.buildEvaluationContext(ctx, sourceBlockId)
     const rawSourceOutput = sourceBlockId ? ctx.blockStates.get(sourceBlockId)?.output : null
 
     // Filter out _pauseMetadata from source output to prevent the engine from
     // thinking this block is pausing (it was already resumed by the HITL block)
     const sourceOutput = this.filterPauseMetadata(rawSourceOutput)
 
-    const outgoingConnections = ctx.workflow?.connections.filter((conn) => conn.source === block.id)
+    const outgoingConnections = ctx.workflow?.connections.filter(
+      (conn) => conn.source === baseBlockId
+    )
 
     const { selectedConnection, selectedCondition } = await this.evaluateConditions(
       conditions,
       outgoingConnections || [],
       evalContext,
-      ctx
+      ctx,
+      block.id
     )
 
     if (!selectedConnection || !selectedCondition) {
@@ -170,7 +192,8 @@ export class ConditionBlockHandler implements BlockHandler {
     conditions: Array<{ id: string; title: string; value: string }>,
     outgoingConnections: Array<{ source: string; target: string; sourceHandle?: string }>,
     evalContext: Record<string, any>,
-    ctx: ExecutionContext
+    ctx: ExecutionContext,
+    currentNodeId?: string
   ): Promise<{
     selectedConnection: { target: string; sourceHandle?: string } | null
     selectedCondition: { id: string; title: string; value: string } | null
@@ -189,7 +212,8 @@ export class ConditionBlockHandler implements BlockHandler {
         const conditionMet = await evaluateConditionExpression(
           ctx,
           conditionValueString,
-          evalContext
+          evalContext,
+          currentNodeId
         )
 
         if (conditionMet) {

apps/sim/executor/utils/block-data.ts

@@ -2,6 +2,11 @@ import { normalizeInputFormatValue } from '@/lib/workflows/input-format'
 import { isTriggerBehavior, normalizeName } from '@/executor/constants'
 import type { ExecutionContext } from '@/executor/types'
 import type { OutputSchema } from '@/executor/utils/block-reference'
+import {
+  extractBaseBlockId,
+  extractBranchIndex,
+  isBranchNodeId,
+} from '@/executor/utils/subflow-utils'
 import type { SerializedBlock } from '@/serializer/types'
 import type { ToolConfig } from '@/tools/types'
 import { getTool } from '@/tools/utils'
@@ -86,14 +91,30 @@ export function getBlockSchema(
   return undefined
 }
 
-export function collectBlockData(ctx: ExecutionContext): BlockDataCollection {
+export function collectBlockData(
+  ctx: ExecutionContext,
+  currentNodeId?: string
+): BlockDataCollection {
   const blockData: Record<string, unknown> = {}
   const blockNameMapping: Record<string, string> = {}
   const blockOutputSchemas: Record<string, OutputSchema> = {}
 
+  const branchIndex =
+    currentNodeId && isBranchNodeId(currentNodeId) ? extractBranchIndex(currentNodeId) : null
+
   for (const [id, state] of ctx.blockStates.entries()) {
     if (state.output !== undefined) {
       blockData[id] = state.output
+
+      if (branchIndex !== null && isBranchNodeId(id)) {
+        const stateBranchIndex = extractBranchIndex(id)
+        if (stateBranchIndex === branchIndex) {
+          const baseId = extractBaseBlockId(id)
+          if (blockData[baseId] === undefined) {
+            blockData[baseId] = state.output
+          }
+        }
+      }
     }
   }