feat(chat): add 'add inputs' button to chat window

apps/sim/app/globals.css

@@ -281,6 +281,8 @@
     --c-F4F4F4: #f4f4f4;
     --c-F5F5F5: #f5f5f5;
 
+    --c-CFCFCF: #cfcfcf;
+
     /* Blues and cyans */
     --c-00B0B0: #00b0b0;
     --c-264F78: #264f78;

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/chat/chat.tsx

@@ -2,7 +2,6 @@
 
 import { type KeyboardEvent, useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { AlertCircle, ArrowDownToLine, ArrowUp, MoreVertical, Paperclip, X } from 'lucide-react'
-import { useParams } from 'next/navigation'
 import {
   Badge,
   Button,
@@ -14,20 +13,27 @@ import {
   PopoverTrigger,
   Trash,
 } from '@/components/emcn'
+import { useSession } from '@/lib/auth-client'
 import { createLogger } from '@/lib/logs/console/logger'
 import {
   extractBlockIdFromOutputId,
   extractPathFromOutputId,
   parseOutputContentSafely,
 } from '@/lib/response-format'
 import { cn } from '@/lib/utils'
+import { normalizeInputFormatValue } from '@/lib/workflows/input-format-utils'
+import { StartBlockPath, TriggerUtils } from '@/lib/workflows/triggers'
+import { START_BLOCK_RESERVED_FIELDS } from '@/lib/workflows/types'
 import { useScrollManagement } from '@/app/workspace/[workspaceId]/w/[workflowId]/hooks'
 import { useWorkflowExecution } from '@/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-workflow-execution'
 import type { BlockLog, ExecutionResult } from '@/executor/types'
 import { getChatPosition, useChatStore } from '@/stores/chat/store'
 import { useExecutionStore } from '@/stores/execution/store'
+import { useOperationQueue } from '@/stores/operation-queue/store'
 import { useTerminalConsoleStore } from '@/stores/terminal'
 import { useWorkflowRegistry } from '@/stores/workflows/registry/store'
+import { useSubBlockStore } from '@/stores/workflows/subblock/store'
+import { useWorkflowStore } from '@/stores/workflows/workflow/store'
 import { ChatMessage, OutputSelect } from './components'
 import { useChatBoundarySync, useChatDrag, useChatFileUpload, useChatResize } from './hooks'
 
@@ -124,6 +130,14 @@ const formatOutputContent = (output: any): string => {
   return ''
 }
 
+interface StartInputFormatField {
+  id?: string
+  name?: string
+  type?: string
+  value?: unknown
+  collapsed?: boolean
+}
+
 /**
  * Floating chat modal component
  *
@@ -137,9 +151,10 @@ const formatOutputContent = (output: any): string => {
  * position across sessions using the floating chat store.
  */
 export function Chat() {
-  const params = useParams()
-  const workspaceId = params.workspaceId as string
   const { activeWorkflowId } = useWorkflowRegistry()
+  const blocks = useWorkflowStore((state) => state.blocks)
+  const triggerWorkflowUpdate = useWorkflowStore((state) => state.triggerUpdate)
+  const setSubBlockValue = useSubBlockStore((state) => state.setValue)
 
   // Chat state (UI and messages from unified store)
   const {
@@ -164,6 +179,8 @@ export function Chat() {
   const { entries } = useTerminalConsoleStore()
   const { isExecuting } = useExecutionStore()
   const { handleRunWorkflow } = useWorkflowExecution()
+  const { data: session } = useSession()
+  const { addToQueue } = useOperationQueue()
 
   // Local state
   const [chatMessage, setChatMessage] = useState('')
@@ -190,6 +207,71 @@ export function Chat() {
     handleDrop,
   } = useChatFileUpload()
 
+  /**
+   * Resolves the unified start block for chat execution, if available.
+   */
+  const startBlockCandidate = useMemo(() => {
+    if (!activeWorkflowId) {
+      return null
+    }
+
+    if (!blocks || Object.keys(blocks).length === 0) {
+      return null
+    }
+
+    const candidate = TriggerUtils.findStartBlock(blocks, 'chat')
+    if (!candidate || candidate.path !== StartBlockPath.UNIFIED) {
+      return null
+    }
+
+    return candidate
+  }, [activeWorkflowId, blocks])
+
+  const startBlockId = startBlockCandidate?.blockId ?? null
+
+  /**
+   * Reads the current input format for the unified start block from the subblock store,
+   * falling back to the workflow store if no explicit value is stored yet.
+   */
+  const startBlockInputFormat = useSubBlockStore((state) => {
+    if (!activeWorkflowId || !startBlockId) {
+      return null
+    }
+
+    const workflowValues = state.workflowValues[activeWorkflowId]
+    const fromStore = workflowValues?.[startBlockId]?.inputFormat
+    if (fromStore !== undefined && fromStore !== null) {
+      return fromStore
+    }
+
+    const startBlock = blocks[startBlockId]
+    return startBlock?.subBlocks?.inputFormat?.value ?? null
+  })
+
+  /**
+   * Determines which reserved start inputs are missing from the input format.
+   */
+  const missingStartReservedFields = useMemo(() => {
+    if (!startBlockId) {
+      return START_BLOCK_RESERVED_FIELDS
+    }
+
+    const normalizedFields = normalizeInputFormatValue(startBlockInputFormat)
+    const existingNames = new Set(
+      normalizedFields
+        .map((field) => field.name)
+        .filter((name): name is string => typeof name === 'string' && name.trim() !== '')
+        .map((name) => name.trim().toLowerCase())
+    )
+
+    return START_BLOCK_RESERVED_FIELDS.filter(
+      (fieldName) => !existingNames.has(fieldName.toLowerCase())
+    )
+  }, [startBlockId, startBlockInputFormat])
+
+  const shouldShowConfigureStartInputsButton =
+    Boolean(startBlockId) && missingStartReservedFields.length > 0
+
   // Get actual position (default if not set)
   const actualPosition = useMemo(
     () => getChatPosition(chatPosition, chatWidth, chatHeight),
@@ -564,7 +646,67 @@ export function Chat() {
     setIsChatOpen(false)
   }, [setIsChatOpen])
 
-  // Don't render if not open
+  /**
+   * Adds any missing reserved inputs (input, conversationId, files) to the unified start block.
+   */
+  const handleConfigureStartInputs = useCallback(() => {
+    if (!activeWorkflowId || !startBlockId) {
+      logger.warn('Cannot configure start inputs: missing active workflow ID or start block ID')
+      return
+    }
+
+    try {
+      const normalizedExisting = normalizeInputFormatValue(startBlockInputFormat)
+
+      const newReservedFields: StartInputFormatField[] = missingStartReservedFields.map(
+        (fieldName) => {
+          const defaultType = fieldName === 'files' ? 'files' : 'string'
+
+          return {
+            id: crypto.randomUUID(),
+            name: fieldName,
+            type: defaultType,
+            value: '',
+            collapsed: false,
+          }
+        }
+      )
+
+      const updatedFields: StartInputFormatField[] = [...newReservedFields, ...normalizedExisting]
+
+      setSubBlockValue(startBlockId, 'inputFormat', updatedFields)
+
+      const userId = session?.user?.id || 'unknown'
+      addToQueue({
+        id: crypto.randomUUID(),
+        operation: {
+          operation: 'subblock-update',
+          target: 'subblock',
+          payload: {
+            blockId: startBlockId,
+            subblockId: 'inputFormat',
+            value: updatedFields,
+          },
+        },
+        workflowId: activeWorkflowId,
+        userId,
+      })
+
+      triggerWorkflowUpdate()
+    } catch (error) {
+      logger.error('Failed to configure start block reserved inputs', error)
+    }
+  }, [
+    activeWorkflowId,
+    missingStartReservedFields,
+    setSubBlockValue,
+    startBlockId,
+    startBlockInputFormat,
+    triggerWorkflowUpdate,
+    session,
+    addToQueue,
+  ])
+
   if (!isChatOpen) return null
 
   return (
@@ -583,17 +725,32 @@ export function Chat() {
     >
       {/* Header with drag handle */}
       <div
-        className='flex h-[32px] flex-shrink-0 cursor-grab items-center justify-between bg-[var(--surface-1)] p-0 active:cursor-grabbing'
+        className='flex h-[32px] flex-shrink-0 cursor-grab items-center justify-between gap-[10px] bg-[var(--surface-1)] p-0 active:cursor-grabbing'
         onMouseDown={handleMouseDown}
       >
-        <div className='flex items-center'>
-          <span className='flex-shrink-0 font-medium text-[14px] text-[var(--text-primary)]'>
-            Chat
-          </span>
-        </div>
+        <span className='flex-shrink-0 pr-[2px] font-medium text-[14px] text-[var(--text-primary)]'>
+          Chat
+        </span>
+
+        {/* Start inputs button and output selector - with max-width to prevent overflow */}
+        <div
+          className='ml-auto flex min-w-0 flex-shrink items-center gap-[6px]'
+          onMouseDown={(e) => e.stopPropagation()}
+        >
+          {shouldShowConfigureStartInputsButton && (
+            <Badge
+              variant='outline'
+              className='flex-none cursor-pointer whitespace-nowrap rounded-[6px]'
+              title='Add chat inputs to Start block'
+              onMouseDown={(e) => {
+                e.stopPropagation()
+                handleConfigureStartInputs()
+              }}
+            >
+              <span className='whitespace-nowrap text-[12px]'>Add inputs</span>
+            </Badge>
+          )}
 
-        {/* Output selector - centered with mx-auto */}
-        <div className='mr-[6px] ml-auto' onMouseDown={(e) => e.stopPropagation()}>
           <OutputSelect
             workflowId={activeWorkflowId}
             selectedOutputs={selectedOutputs}
@@ -605,7 +762,7 @@ export function Chat() {
           />
         </div>
 
-        <div className='flex items-center gap-[8px]'>
+        <div className='flex flex-shrink-0 items-center gap-[8px]'>
           {/* More menu with actions */}
           <Popover variant='default'>
             <PopoverTrigger asChild>
@@ -628,22 +785,22 @@ export function Chat() {
                 <PopoverItem
                   onClick={(e) => {
                     e.stopPropagation()
-                    if (activeWorkflowId) clearChat(activeWorkflowId)
+                    if (activeWorkflowId) exportChatCSV(activeWorkflowId)
                   }}
-                  disabled={messages.length === 0}
+                  disabled={workflowMessages.length === 0}
                 >
-                  <Trash className='h-[14px] w-[14px]' />
-                  <span>Clear</span>
+                  <ArrowDownToLine className='h-[13px] w-[13px]' />
+                  <span>Download</span>
                 </PopoverItem>
                 <PopoverItem
                   onClick={(e) => {
                     e.stopPropagation()
-                    if (activeWorkflowId) exportChatCSV(activeWorkflowId)
+                    if (activeWorkflowId) clearChat(activeWorkflowId)
                   }}
-                  disabled={messages.length === 0}
+                  disabled={workflowMessages.length === 0}
                 >
-                  <ArrowDownToLine className='h-[14px] w-[14px]' />
-                  <span>Download</span>
+                  <Trash className='h-[13px] w-[13px]' />
+                  <span>Clear</span>
                 </PopoverItem>
               </PopoverScrollArea>
             </PopoverContent>
@@ -662,7 +819,7 @@ export function Chat() {
         <div className='flex-1 overflow-hidden'>
           {workflowMessages.length === 0 ? (
             <div className='flex h-full items-center justify-center text-[#8D8D8D] text-[13px]'>
-              No messages yet
+              Workflow input: {'<start.input>'}
             </div>
           ) : (
             <div ref={scrollAreaRef} className='h-full overflow-y-auto overflow-x-hidden'>

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/chat/hooks/use-chat-resize.ts

@@ -178,16 +178,11 @@ export function useChatResize({
     (e: MouseEvent) => {
       if (!isResizingRef.current || !activeDirectionRef.current) return
 
-      const deltaX = e.clientX - resizeStartRef.current.x
-      const deltaY = e.clientY - resizeStartRef.current.y
+      let deltaX = e.clientX - resizeStartRef.current.x
+      let deltaY = e.clientY - resizeStartRef.current.y
       const initial = initialStateRef.current
       const direction = activeDirectionRef.current
 
-      let newX = initial.x
-      let newY = initial.y
-      let newWidth = initial.width
-      let newHeight = initial.height
-
       // Get layout bounds
       const sidebarWidth = Number.parseInt(
         getComputedStyle(document.documentElement).getPropertyValue('--sidebar-width') || '0'
@@ -199,6 +194,56 @@ export function useChatResize({
         getComputedStyle(document.documentElement).getPropertyValue('--terminal-height') || '0'
       )
 
+      // Clamp vertical drag when resizing from the top so the chat does not grow downward
+      // after its top edge hits the top of the viewport.
+      if (direction === 'top' || direction === 'top-left' || direction === 'top-right') {
+        // newY = initial.y + deltaY should never be less than 0
+        const maxUpwardDelta = initial.y
+        if (deltaY < -maxUpwardDelta) {
+          deltaY = -maxUpwardDelta
+        }
+      }
+
+      // Clamp vertical drag when resizing from the bottom so the chat does not grow upward
+      // after its bottom edge hits the top of the terminal.
+      if (direction === 'bottom' || direction === 'bottom-left' || direction === 'bottom-right') {
+        const maxBottom = window.innerHeight - terminalHeight
+        const initialBottom = initial.y + initial.height
+        const maxDeltaY = maxBottom - initialBottom
+
+        if (deltaY > maxDeltaY) {
+          deltaY = maxDeltaY
+        }
+      }
+
+      // Clamp horizontal drag when resizing from the left so the chat does not grow to the right
+      // after its left edge hits the sidebar.
+      if (direction === 'left' || direction === 'top-left' || direction === 'bottom-left') {
+        const minLeft = sidebarWidth
+        const minDeltaX = minLeft - initial.x
+
+        if (deltaX < minDeltaX) {
+          deltaX = minDeltaX
+        }
+      }
+
+      // Clamp horizontal drag when resizing from the right so the chat does not grow to the left
+      // after its right edge hits the panel.
+      if (direction === 'right' || direction === 'top-right' || direction === 'bottom-right') {
+        const maxRight = window.innerWidth - panelWidth
+        const initialRight = initial.x + initial.width
+        const maxDeltaX = maxRight - initialRight
+
+        if (deltaX > maxDeltaX) {
+          deltaX = maxDeltaX
+        }
+      }
+
+      let newX = initial.x
+      let newY = initial.y
+      let newWidth = initial.width
+      let newHeight = initial.height
+
       // Calculate new dimensions based on resize direction
       switch (direction) {
         // Corners