make it work with start block

Author: icecrasher321

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/components/sub-block/components/input-mapping/input-mapping.tsx

@@ -14,7 +14,7 @@ interface InputFormatField {
 }
 
 interface InputTriggerBlock {
-  type: 'input_trigger'
+  type: 'input_trigger' | 'start_trigger'
   subBlocks?: {
     inputFormat?: { value?: InputFormatField[] }
   }
@@ -33,8 +33,9 @@ interface StarterBlockLegacy {
 }
 
 function isInputTriggerBlock(value: unknown): value is InputTriggerBlock {
+  const type = (value as { type?: unknown }).type
   return (
-    !!value && typeof value === 'object' && (value as { type?: unknown }).type === 'input_trigger'
+    !!value && typeof value === 'object' && (type === 'input_trigger' || type === 'start_trigger')
   )
 }
 
@@ -74,7 +75,7 @@ export function InputMapping({
 
   // Fetch child workflow state via registry API endpoint, using cached metadata when possible
   // Here we rely on live store; the serializer/executor will resolve at runtime too.
-  // We only need the inputFormat from an Input Trigger in the selected child workflow state.
+  // We only need the inputFormat from a Start or Input Trigger in the selected child workflow state.
   const [childInputFields, setChildInputFields] = useState<Array<{ name: string; type?: string }>>(
     []
   )
@@ -97,7 +98,7 @@ export function InputMapping({
         }
         const { data } = await res.json()
         const blocks = (data?.state?.blocks as Record<string, unknown>) || {}
-        // Prefer new input_trigger
+        // Prefer start_trigger or input_trigger
         const triggerEntry = Object.entries(blocks).find(([, b]) => isInputTriggerBlock(b))
         if (triggerEntry && isInputTriggerBlock(triggerEntry[1])) {
           const inputFormat = triggerEntry[1].subBlocks?.inputFormat?.value

apps/sim/blocks/blocks/workflow_input.ts

@@ -19,11 +19,11 @@ const getAvailableWorkflows = (): Array<{ label: string; id: string }> => {
 export const WorkflowInputBlock: BlockConfig = {
   type: 'workflow_input',
   name: 'Workflow',
-  description: 'Execute another workflow and map variables to its Input Form Trigger schema.',
-  longDescription: `Execute another child workflow and map variables to its Input Form Trigger schema. Helps with modularizing workflows.`,
+  description: 'Execute another workflow and map variables to its Start trigger schema.',
+  longDescription: `Execute another child workflow and map variables to its Start trigger schema. Helps with modularizing workflows.`,
   bestPractices: `
   - Usually clarify/check if the user has tagged a workflow to use as the child workflow. Understand the child workflow to determine the logical position of this block in the workflow.
-  - Remember, that the start point of the child workflow is the Input Form Trigger block.
+  - Remember, that the start point of the child workflow is the Start block.
   `,
   category: 'blocks',
   bgColor: '#6366F1', // Indigo - modern and professional
@@ -36,14 +36,14 @@ export const WorkflowInputBlock: BlockConfig = {
       options: getAvailableWorkflows,
       required: true,
     },
-    // Renders dynamic mapping UI based on selected child workflow's Input Trigger inputFormat
+    // Renders dynamic mapping UI based on selected child workflow's Start trigger inputFormat
     {
       id: 'inputMapping',
       title: 'Input Mapping',
       type: 'input-mapping',
       layout: 'full',
       description:
-        "Map fields defined in the child workflow's Input Trigger to variables/values in this workflow.",
+        "Map fields defined in the child workflow's Start block to variables/values in this workflow.",
       dependsOn: ['workflowId'],
     },
   ],

apps/sim/executor/index.ts

@@ -783,17 +783,21 @@ export class Executor {
       if (!initBlock) {
         if (this.isChildExecution) {
           const inputTriggerBlocks = this.actualWorkflow.blocks.filter(
-            (block) => block.metadata?.id === 'input_trigger'
+            (block) =>
+              block.metadata?.id === 'input_trigger' || block.metadata?.id === 'start_trigger'
           )
           if (inputTriggerBlocks.length === 1) {
             initBlock = inputTriggerBlocks[0]
           } else if (inputTriggerBlocks.length > 1) {
-            throw new Error('Child workflow has multiple Input Trigger blocks. Keep only one.')
+            throw new Error(
+              'Child workflow has multiple trigger blocks. Keep only one Start block.'
+            )
           }
         } else {
           // Parent workflows can use any trigger block (dedicated or trigger-mode)
           const triggerBlocks = this.actualWorkflow.blocks.filter(
             (block) =>
+              block.metadata?.id === 'start_trigger' ||
               block.metadata?.id === 'input_trigger' ||
               block.metadata?.id === 'api_trigger' ||
               block.metadata?.id === 'chat_trigger' ||

apps/sim/stores/workflows/registry/store.ts

@@ -442,9 +442,36 @@ export const useWorkflowRegistry = create<WorkflowRegistry>()(
             deploymentStatuses: {},
           }
         } else {
-          // If no state in DB, use empty state - server should have created start block
+          // If no state in DB, create a default Start block
+          const starterId = crypto.randomUUID()
           workflowState = {
-            blocks: {},
+            blocks: {
+              [starterId]: {
+                id: starterId,
+                type: 'start_trigger',
+                name: 'Start',
+                position: { x: 200, y: 300 },
+                enabled: true,
+                horizontalHandles: true,
+                isWide: false,
+                advancedMode: false,
+                triggerMode: false,
+                height: 0,
+                subBlocks: {
+                  inputFormat: {
+                    id: 'inputFormat',
+                    type: 'input-format',
+                    value: [],
+                  },
+                },
+                outputs: {
+                  input: { type: 'string', description: 'Primary user input or message' },
+                  conversationId: { type: 'string', description: 'Conversation thread identifier' },
+                  files: { type: 'files', description: 'User uploaded files' },
+                },
+                data: {},
+              },
+            },
             edges: [],
             loops: {},
             parallels: {},
@@ -454,9 +481,7 @@ export const useWorkflowRegistry = create<WorkflowRegistry>()(
             lastSaved: Date.now(),
           }
 
-          logger.warn(
-            `Workflow ${id} has no state in DB - this should not happen with server-side start block creation`
-          )
+          logger.info(`Created default Start block for empty workflow ${id}`)
         }
 
         if (workflowData?.isDeployed || workflowData?.deployedAt) {