AI-powered assignment generation with enriched data and streaming UI

- Add aiPreview mutation with full project/juror data (bios, descriptions,
  documents, categories, ocean issues, countries, team sizes)
- Increase AI description limit from 300 to 2000 chars for richer context
- Update GPT system prompt to use all available data fields
- Add mode toggle (AI default / Algorithm fallback) in assignment preview
- Lift AI mutation to parent page for background generation persistence
- Show visual indicator on page while AI generates (spinner + progress card)
- Toast notification with "Review" action when AI completes
- Staggered reveal animation for assignment results (streaming feel)
- Fix assignment balance with dynamic penalty (25pts per existing assignment)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(admin)/admin/competitions/[competitionId]/assignments/page.tsx

@@ -2,7 +2,8 @@
 
 import { useState } from 'react'
 import { useParams, useRouter } from 'next/navigation'
-import { ArrowLeft, PlayCircle } from 'lucide-react'
+import { ArrowLeft, Loader2, PlayCircle, Zap } from 'lucide-react'
+import { toast } from 'sonner'
 import { trpc } from '@/lib/trpc/client'
 import { Button } from '@/components/ui/button'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -26,6 +27,16 @@ export default function AssignmentsDashboardPage() {
   const [selectedRoundId, setSelectedRoundId] = useState<string>('')
   const [previewSheetOpen, setPreviewSheetOpen] = useState(false)
 
+  const aiAssignmentMutation = trpc.roundAssignment.aiPreview.useMutation({
+    onSuccess: () => {
+      toast.success('AI assignments ready!', {
+        action: { label: 'Review', onClick: () => setPreviewSheetOpen(true) },
+        duration: 10000,
+      })
+    },
+    onError: (err) => toast.error(`AI generation failed: ${err.message}`),
+  })
+
   const { data: competition, isLoading: isLoadingCompetition } = trpc.competition.getById.useQuery({
     id: competitionId,
   })
@@ -104,11 +115,24 @@ export default function AssignmentsDashboardPage() {
 
       {selectedRoundId && (
         <div className="space-y-6">
-          <div className="flex justify-end">
-            <Button onClick={() => setPreviewSheetOpen(true)}>
-              <PlayCircle className="mr-2 h-4 w-4" />
-              Generate Assignments
+          <div className="flex justify-end gap-2">
+            <Button
+              onClick={() => {
+                aiAssignmentMutation.mutate({ roundId: selectedRoundId, requiredReviews })
+              }}
+              disabled={aiAssignmentMutation.isPending}
+            >
+              {aiAssignmentMutation.isPending ? (
+                <><Loader2 className="mr-2 h-4 w-4 animate-spin" />Generating...</>
+              ) : (
+                <><Zap className="mr-2 h-4 w-4" />{aiAssignmentMutation.data ? 'Regenerate' : 'Generate with AI'}</>
+              )}
             </Button>
+            {aiAssignmentMutation.data && (
+              <Button variant="outline" onClick={() => setPreviewSheetOpen(true)}>
+                Review Assignments
+              </Button>
+            )}
           </div>
 
           <Tabs defaultValue="coverage" className="w-full">
@@ -170,6 +194,10 @@ export default function AssignmentsDashboardPage() {
             open={previewSheetOpen}
             onOpenChange={setPreviewSheetOpen}
             requiredReviews={requiredReviews}
+            aiResult={aiAssignmentMutation.data ?? null}
+            isAIGenerating={aiAssignmentMutation.isPending}
+            onGenerateAI={() => aiAssignmentMutation.mutate({ roundId: selectedRoundId, requiredReviews })}
+            onResetAI={() => aiAssignmentMutation.reset()}
           />
         </div>
       )}

src/app/(admin)/admin/rounds/[roundId]/page.tsx

@@ -170,6 +170,22 @@ export default function RoundDetailPage() {
   const pendingSaveRef = useRef(false)
   const [activeTab, setActiveTab] = useState('overview')
   const [previewSheetOpen, setPreviewSheetOpen] = useState(false)
+
+  // AI assignment generation (lifted to page level so it persists when sheet closes)
+  const aiAssignmentMutation = trpc.roundAssignment.aiPreview.useMutation({
+    onSuccess: () => {
+      toast.success('AI assignments ready!', {
+        action: {
+          label: 'Review',
+          onClick: () => setPreviewSheetOpen(true),
+        },
+        duration: 10000,
+      })
+    },
+    onError: (err) => {
+      toast.error(`AI generation failed: ${err.message}`)
+    },
+  })
   const [exportOpen, setExportOpen] = useState(false)
   const [advanceDialogOpen, setAdvanceDialogOpen] = useState(false)
   const [aiRecommendations, setAiRecommendations] = useState<{
@@ -1514,23 +1530,62 @@ export default function RoundDetailPage() {
             <CoverageReport roundId={roundId} requiredReviews={(config.requiredReviewsPerProject as number) || 3} />
 
             {/* Generate Assignments */}
-            <Card>
+            <Card className={cn(aiAssignmentMutation.isPending && 'border-violet-300 shadow-violet-100 shadow-sm')}>
               <CardHeader>
                 <div className="flex items-center justify-between">
                   <div>
-                    <CardTitle className="text-base">Assignment Generation</CardTitle>
+                    <CardTitle className="text-base flex items-center gap-2">
+                      Assignment Generation
+                      {aiAssignmentMutation.isPending && (
+                        <Badge variant="outline" className="gap-1.5 text-violet-600 border-violet-300 animate-pulse">
+                          <Loader2 className="h-3 w-3 animate-spin" />
+                          AI generating...
+                        </Badge>
+                      )}
+                      {aiAssignmentMutation.data && !aiAssignmentMutation.isPending && (
+                        <Badge variant="outline" className="gap-1 text-emerald-600 border-emerald-300">
+                          <CheckCircle2 className="h-3 w-3" />
+                          {aiAssignmentMutation.data.stats.assignmentsGenerated} ready
+                        </Badge>
+                      )}
+                    </CardTitle>
                     <CardDescription>
                       AI-suggested jury-to-project assignments based on expertise and workload
                     </CardDescription>
                   </div>
+                  <div className="flex items-center gap-2">
+                    {aiAssignmentMutation.data && !aiAssignmentMutation.isPending && (
                       <Button
                         size="sm"
+                        variant="outline"
                         onClick={() => setPreviewSheetOpen(true)}
-                    disabled={projectCount === 0 || !juryGroup}
                       >
-                    <Zap className="h-4 w-4 mr-1.5" />
-                    Generate Assignments
+                        Review Assignments
                       </Button>
+                    )}
+                    <Button
+                      size="sm"
+                      onClick={() => {
+                        aiAssignmentMutation.mutate({
+                          roundId,
+                          requiredReviews: (config.requiredReviewsPerProject as number) || 3,
+                        })
+                      }}
+                      disabled={projectCount === 0 || !juryGroup || aiAssignmentMutation.isPending}
+                    >
+                      {aiAssignmentMutation.isPending ? (
+                        <>
+                          <Loader2 className="h-4 w-4 mr-1.5 animate-spin" />
+                          Generating...
+                        </>
+                      ) : (
+                        <>
+                          <Zap className="h-4 w-4 mr-1.5" />
+                          {aiAssignmentMutation.data ? 'Regenerate' : 'Generate with AI'}
+                        </>
+                      )}
+                    </Button>
+                  </div>
                 </div>
               </CardHeader>
               <CardContent>
@@ -1546,12 +1601,41 @@ export default function RoundDetailPage() {
                     Add projects to this round first.
                   </div>
                 )}
-                {juryGroup && projectCount > 0 && (
+                {juryGroup && projectCount > 0 && !aiAssignmentMutation.isPending && !aiAssignmentMutation.data && (
                   <p className="text-sm text-muted-foreground">
-                    Click &quot;Generate Assignments&quot; to preview AI-suggested assignments.
-                    You can review and execute them from the preview sheet.
+                    Click &quot;Generate with AI&quot; to create assignments using GPT analysis of juror expertise, project descriptions, and documents. Or open the preview to use the algorithm instead.
                   </p>
                 )}
+                {aiAssignmentMutation.isPending && (
+                  <div className="flex items-center gap-3 p-3 rounded-lg bg-violet-50 border border-violet-200 dark:bg-violet-950/20 dark:border-violet-800">
+                    <div className="relative">
+                      <div className="h-8 w-8 rounded-full border-2 border-violet-300 border-t-violet-600 animate-spin" />
+                    </div>
+                    <div>
+                      <p className="text-sm font-medium text-violet-800 dark:text-violet-200">AI is analyzing projects and jurors...</p>
+                      <p className="text-xs text-violet-600 dark:text-violet-400">
+                        Matching expertise, reviewing bios, and balancing workloads
+                      </p>
+                    </div>
+                  </div>
+                )}
+                {aiAssignmentMutation.data && !aiAssignmentMutation.isPending && (
+                  <div className="flex items-center gap-3 p-3 rounded-lg bg-emerald-50 border border-emerald-200 dark:bg-emerald-950/20 dark:border-emerald-800">
+                    <CheckCircle2 className="h-5 w-5 text-emerald-600 shrink-0" />
+                    <div className="flex-1">
+                      <p className="text-sm font-medium text-emerald-800 dark:text-emerald-200">
+                        {aiAssignmentMutation.data.stats.assignmentsGenerated} assignments generated
+                      </p>
+                      <p className="text-xs text-emerald-600 dark:text-emerald-400">
+                        {aiAssignmentMutation.data.stats.totalJurors} jurors, {aiAssignmentMutation.data.stats.totalProjects} projects
+                        {aiAssignmentMutation.data.fallbackUsed && ' (algorithm fallback)'}
+                      </p>
+                    </div>
+                    <Button size="sm" variant="outline" onClick={() => setPreviewSheetOpen(true)}>
+                      Review &amp; Execute
+                    </Button>
+                  </div>
+                )}
               </CardContent>
             </Card>
 
@@ -1582,6 +1666,13 @@ export default function RoundDetailPage() {
               open={previewSheetOpen}
               onOpenChange={setPreviewSheetOpen}
               requiredReviews={(config.requiredReviewsPerProject as number) || 3}
+              aiResult={aiAssignmentMutation.data ?? null}
+              isAIGenerating={aiAssignmentMutation.isPending}
+              onGenerateAI={() => aiAssignmentMutation.mutate({
+                roundId,
+                requiredReviews: (config.requiredReviewsPerProject as number) || 3,
+              })}
+              onResetAI={() => aiAssignmentMutation.reset()}
             />
 
             {/* CSV Export Dialog */}

src/components/admin/assignment/assignment-preview-sheet.tsx

@@ -1,18 +1,19 @@
 'use client'
 
-import { useState, useEffect, useMemo } from 'react'
+import { useState, useEffect, useMemo, useRef } from 'react'
 import {
   AlertTriangle,
-  Bot,
   CheckCircle2,
   ChevronDown,
   ChevronRight,
+  Cpu,
   Loader2,
   Plus,
   Sparkles,
   Tag,
   User,
   X,
+  Zap,
 } from 'lucide-react'
 import { toast } from 'sonner'
 import { trpc } from '@/lib/trpc/client'
@@ -49,6 +50,8 @@ import {
 } from '@/components/ui/tooltip'
 import { cn } from '@/lib/utils'
 
+type AssignmentMode = 'ai' | 'algorithm'
+
 type EditableAssignment = {
   localId: string
   userId: string
@@ -63,11 +66,27 @@ type EditableAssignment = {
   isManual: boolean
 }
 
+type AIPreviewData = {
+  assignments: any[]
+  warnings: string[]
+  stats: { totalProjects: number; totalJurors: number; assignmentsGenerated: number; unassignedProjects: number }
+  fallbackUsed?: boolean
+  tokensUsed?: number
+}
+
 type AssignmentPreviewSheetProps = {
   roundId: string
   open: boolean
   onOpenChange: (open: boolean) => void
   requiredReviews?: number
+  /** AI preview result from parent (lifted mutation) */
+  aiResult?: AIPreviewData | null
+  /** Whether AI is currently generating */
+  isAIGenerating?: boolean
+  /** Trigger AI generation from parent */
+  onGenerateAI?: () => void
+  /** Reset AI results */
+  onResetAI?: () => void
 }
 
 export function AssignmentPreviewSheet({
@@ -75,25 +94,38 @@ export function AssignmentPreviewSheet({
   open,
   onOpenChange,
   requiredReviews = 3,
+  aiResult,
+  isAIGenerating = false,
+  onGenerateAI,
+  onResetAI,
 }: AssignmentPreviewSheetProps) {
   const utils = trpc.useUtils()
 
+  const [mode, setMode] = useState<AssignmentMode>('ai')
   const [assignments, setAssignments] = useState<EditableAssignment[]>([])
   const [initialized, setInitialized] = useState(false)
   const [expandedJurors, setExpandedJurors] = useState<Set<string>>(new Set())
   const [addJurorId, setAddJurorId] = useState<string>('')
   const [addProjectId, setAddProjectId] = useState<string>('')
+  // Track staggered reveal for streaming effect
+  const [visibleCount, setVisibleCount] = useState(0)
+  const staggerTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
 
   // ── Queries ──────────────────────────────────────────────────────────────
+
+  // Algorithm mode query (only runs when algorithm mode is selected)
   const {
-    data: preview,
-    isLoading,
-    refetch,
+    data: algoPreview,
+    isLoading: isAlgoLoading,
   } = trpc.roundAssignment.preview.useQuery(
     { roundId, honorIntents: true, requiredReviews },
-    { enabled: open },
+    { enabled: open && mode === 'algorithm' },
   )
 
+  // Active preview data based on mode
+  const preview = mode === 'ai' ? aiResult : algoPreview
+  const isLoading = mode === 'ai' ? isAIGenerating : isAlgoLoading
+
   // Fetch round data for jury group members
   const { data: round } = trpc.round.getById.useQuery(
     { id: roundId },
@@ -127,12 +159,12 @@ export function AssignmentPreviewSheet({
       },
     })
 
-  // ── Initialize local state from preview ──────────────────────────────────
+  // ── Initialize local state from preview with staggered reveal ──────────
   useEffect(() => {
     if (preview && !initialized) {
       const mapped: EditableAssignment[] = preview.assignments.map(
         (a: any, idx: number) => ({
-          localId: `ai-${idx}`,
+          localId: `${mode}-${idx}`,
           userId: a.userId,
           userName: a.userName,
           projectId: a.projectId,
@@ -146,14 +178,36 @@ export function AssignmentPreviewSheet({
         }),
       )
       setAssignments(mapped)
+
       // Auto-expand all jurors
       const jurorIds = new Set(mapped.map((a) => a.userId))
       setExpandedJurors(jurorIds)
       setInitialized(true)
-    }
-  }, [preview, initialized])
 
-  // Reset when sheet closes
+      // Staggered reveal: show assignments one by one
+      setVisibleCount(0)
+      const totalGroups = new Set(mapped.map((a) => a.userId)).size
+      let count = 0
+      const reveal = () => {
+        count++
+        setVisibleCount(count)
+        if (count < totalGroups) {
+          staggerTimerRef.current = setTimeout(reveal, 150)
+        }
+      }
+      // Start after a small delay for visual effect
+      staggerTimerRef.current = setTimeout(reveal, 100)
+    }
+  }, [preview, initialized, mode])
+
+  // Cleanup stagger timer
+  useEffect(() => {
+    return () => {
+      if (staggerTimerRef.current) clearTimeout(staggerTimerRef.current)
+    }
+  }, [])
+
+  // Reset when sheet closes (but preserve AI results in parent)
   useEffect(() => {
     if (!open) {
       setInitialized(false)
@@ -161,9 +215,21 @@ export function AssignmentPreviewSheet({
       setExpandedJurors(new Set())
       setAddJurorId('')
       setAddProjectId('')
+      setVisibleCount(0)
+      if (staggerTimerRef.current) clearTimeout(staggerTimerRef.current)
     }
   }, [open])
 
+  // Reset assignments when mode changes
+  const handleModeChange = (newMode: AssignmentMode) => {
+    if (newMode === mode) return
+    setMode(newMode)
+    setInitialized(false)
+    setAssignments([])
+    setExpandedJurors(new Set())
+    setVisibleCount(0)
+  }
+
   // ── Derived data ─────────────────────────────────────────────────────────
   const juryMembers = useMemo(() => {
     if (!round?.juryGroup?.members) return []
@@ -271,8 +337,9 @@ export function AssignmentPreviewSheet({
       },
     ])
 
-    // Expand the juror's section
+    // Expand the juror's section and make visible
     setExpandedJurors((prev) => new Set([...prev, addJurorId]))
+    setVisibleCount((prev) => Math.max(prev, groupedByJuror.length + 1))
     setAddProjectId('')
   }
 
@@ -329,25 +396,139 @@ export function AssignmentPreviewSheet({
       <SheetContent className="w-full sm:max-w-2xl p-0 flex flex-col">
         <SheetHeader className="px-6 pt-6 pb-4 border-b shrink-0">
           <SheetTitle className="text-lg">Assignment Preview</SheetTitle>
-          <SheetDescription className="flex flex-wrap items-center gap-2 text-sm">
-            <Badge variant="outline" className="text-xs gap-1 shrink-0">
-              <Bot className="h-3 w-3" />
-              AI Suggested
-            </Badge>
-            Review and fine-tune before executing.
+          <SheetDescription className="text-sm">
+            Review and fine-tune assignments before executing.
           </SheetDescription>
+
+          {/* Mode toggle */}
+          <div className="flex items-center gap-1 mt-2 p-1 rounded-lg bg-muted/50 w-fit">
+            <button
+              type="button"
+              onClick={() => handleModeChange('ai')}
+              className={cn(
+                'flex items-center gap-1.5 px-3 py-1.5 rounded-md text-xs font-medium transition-all',
+                mode === 'ai'
+                  ? 'bg-background shadow-sm text-foreground'
+                  : 'text-muted-foreground hover:text-foreground',
+              )}
+            >
+              <Sparkles className="h-3.5 w-3.5" />
+              AI (GPT)
+            </button>
+            <button
+              type="button"
+              onClick={() => handleModeChange('algorithm')}
+              className={cn(
+                'flex items-center gap-1.5 px-3 py-1.5 rounded-md text-xs font-medium transition-all',
+                mode === 'algorithm'
+                  ? 'bg-background shadow-sm text-foreground'
+                  : 'text-muted-foreground hover:text-foreground',
+              )}
+            >
+              <Cpu className="h-3.5 w-3.5" />
+              Algorithm
+            </button>
+          </div>
         </SheetHeader>
 
         <ScrollArea className="flex-1 min-h-0">
           <div className="px-6 py-4 space-y-4">
+            {/* AI mode: show generate button if no results yet */}
+            {mode === 'ai' && !aiResult && !isAIGenerating && (
+              <Card className="border-dashed">
+                <CardContent className="flex flex-col items-center justify-center py-8 gap-3">
+                  <div className="h-12 w-12 rounded-full bg-violet-100 dark:bg-violet-950 flex items-center justify-center">
+                    <Sparkles className="h-6 w-6 text-violet-600" />
+                  </div>
+                  <div className="text-center space-y-1">
+                    <p className="font-medium text-sm">AI-Powered Assignments</p>
+                    <p className="text-xs text-muted-foreground max-w-xs">
+                      Uses GPT to analyze juror expertise, bios, project descriptions,
+                      and documents to generate optimal assignments.
+                    </p>
+                  </div>
+                  <Button
+                    onClick={onGenerateAI}
+                    className="gap-2 bg-violet-600 hover:bg-violet-700"
+                    disabled={!onGenerateAI}
+                  >
+                    <Zap className="h-4 w-4" />
+                    Generate with AI
+                  </Button>
+                </CardContent>
+              </Card>
+            )}
+
+            {/* Loading state */}
             {isLoading ? (
               <div className="space-y-3">
+                {mode === 'ai' && (
+                  <Card className="border-violet-200 bg-violet-50/50 dark:bg-violet-950/20">
+                    <CardContent className="flex items-center gap-3 py-4">
+                      <div className="relative">
+                        <div className="h-6 w-6 rounded-full border-2 border-violet-300 border-t-violet-600 animate-spin" />
+                      </div>
+                      <div>
+                        <p className="text-sm font-medium">Generating AI assignments...</p>
+                        <p className="text-xs text-muted-foreground">
+                          Analyzing juror expertise and project data with GPT
+                        </p>
+                      </div>
+                    </CardContent>
+                  </Card>
+                )}
                 {[1, 2, 3, 4].map((i) => (
                   <Skeleton key={i} className="h-16 w-full" />
                 ))}
               </div>
             ) : preview ? (
               <>
+                {/* AI metadata */}
+                {mode === 'ai' && aiResult && (
+                  <div className="flex flex-wrap items-center gap-2 text-xs">
+                    <Badge variant="outline" className="gap-1 text-violet-600 border-violet-300">
+                      <Sparkles className="h-3 w-3" />
+                      AI Generated
+                    </Badge>
+                    {aiResult.fallbackUsed && (
+                      <Badge variant="outline" className="gap-1 text-amber-600 border-amber-300">
+                        <AlertTriangle className="h-3 w-3" />
+                        Fallback algorithm used
+                      </Badge>
+                    )}
+                    {(aiResult.tokensUsed ?? 0) > 0 && (
+                      <span className="text-muted-foreground">
+                        {aiResult.tokensUsed?.toLocaleString()} tokens used
+                      </span>
+                    )}
+                    <Button
+                      variant="ghost"
+                      size="sm"
+                      className="h-6 px-2 text-xs"
+                      onClick={() => {
+                        setInitialized(false)
+                        setAssignments([])
+                        setVisibleCount(0)
+                        onGenerateAI?.()
+                      }}
+                    >
+                      Regenerate
+                    </Button>
+                  </div>
+                )}
+
+                {mode === 'algorithm' && (
+                  <div className="flex items-center gap-2 text-xs">
+                    <Badge variant="outline" className="gap-1">
+                      <Cpu className="h-3 w-3" />
+                      Algorithm
+                    </Badge>
+                    <span className="text-muted-foreground">
+                      Tag overlap + bio match + workload balancing
+                    </span>
+                  </div>
+                )}
+
                 {/* ── Summary stats ── */}
                 <div className="grid grid-cols-4 gap-2">
                   {[
@@ -402,7 +583,7 @@ export function AssignmentPreviewSheet({
                   </Card>
                 )}
 
-                {/* ── Juror groups ── */}
+                {/* ── Juror groups with staggered reveal ── */}
                 <div className="space-y-2">
                   <h3 className="text-xs font-semibold uppercase tracking-wider text-muted-foreground">
                     Assignments by Juror
@@ -414,9 +595,17 @@ export function AssignmentPreviewSheet({
                       </CardContent>
                     </Card>
                   ) : (
-                    groupedByJuror.map((group) => (
-                      <JurorGroup
+                    groupedByJuror.map((group, index) => (
+                      <div
                         key={group.userId}
+                        className={cn(
+                          'transition-all duration-300',
+                          index < visibleCount
+                            ? 'opacity-100 translate-y-0'
+                            : 'opacity-0 translate-y-2 pointer-events-none h-0 overflow-hidden',
+                        )}
+                      >
+                        <JurorGroup
                           group={group}
                           expanded={expandedJurors.has(group.userId)}
                           onToggle={() => toggleJuror(group.userId)}
@@ -427,6 +616,7 @@ export function AssignmentPreviewSheet({
                           availableProjects={getAvailableProjectsForJuror(group.userId)}
                           requiredReviews={requiredReviews}
                         />
+                      </div>
                     ))
                   )}
                 </div>
@@ -504,11 +694,11 @@ export function AssignmentPreviewSheet({
                   </CardContent>
                 </Card>
               </>
-            ) : (
+            ) : mode === 'algorithm' ? (
               <p className="text-sm text-muted-foreground">
                 No preview data available
               </p>
-            )}
+            ) : null}
           </div>
         </ScrollArea>
 
@@ -561,7 +751,6 @@ function JurorGroup({
   onRemove,
   onAddProject,
   availableProjects,
-  requiredReviews,
 }: JurorGroupProps) {
   const [inlineProjectId, setInlineProjectId] = useState('')
 
@@ -571,8 +760,6 @@ function JurorGroup({
     setInlineProjectId('')
   }
 
-  const aiCount = group.assignments.filter((a) => !a.isManual).length
-  const manualCount = group.assignments.filter((a) => a.isManual).length
   const avgScore =
     group.assignments.length > 0
       ? Math.round(

src/server/routers/roundAssignment.ts

@@ -7,10 +7,205 @@ import {
   getRoundCoverageReport,
   getUnassignedQueue,
 } from '../services/round-assignment'
+import { generateAIAssignments } from '../services/ai-assignment'
 
 export const roundAssignmentRouter = router({
   /**
-   * Preview round assignments without committing
+   * AI-powered assignment preview using GPT with enriched project/juror data
+   */
+  aiPreview: adminProcedure
+    .input(
+      z.object({
+        roundId: z.string(),
+        requiredReviews: z.number().int().min(1).max(20).default(3),
+      })
+    )
+    .mutation(async ({ ctx, input }) => {
+      // Load round with jury group
+      const round = await ctx.prisma.round.findUnique({
+        where: { id: input.roundId },
+        include: {
+          juryGroup: {
+            include: {
+              members: {
+                include: {
+                  user: {
+                    select: {
+                      id: true, name: true, email: true,
+                      bio: true, expertiseTags: true, country: true,
+                    },
+                  },
+                },
+              },
+            },
+          },
+        },
+      })
+
+      if (!round) {
+        throw new TRPCError({ code: 'NOT_FOUND', message: 'Round not found' })
+      }
+
+      if (!round.juryGroup) {
+        return {
+          assignments: [],
+          warnings: ['Round has no linked jury group'],
+          stats: { totalProjects: 0, totalJurors: 0, assignmentsGenerated: 0, unassignedProjects: 0 },
+          fallbackUsed: false,
+          tokensUsed: 0,
+        }
+      }
+
+      // Load projects with rich data (descriptions, tags, files, team members, etc.)
+      const projectStates = await ctx.prisma.projectRoundState.findMany({
+        where: { roundId: input.roundId, state: { in: ['PENDING', 'IN_PROGRESS'] } },
+        include: {
+          project: {
+            include: {
+              projectTags: { include: { tag: true } },
+              files: { select: { fileType: true, size: true, pageCount: true } },
+              _count: { select: { teamMembers: true } },
+            },
+          },
+        },
+      })
+
+      if (projectStates.length === 0) {
+        return {
+          assignments: [],
+          warnings: ['No active projects in this round'],
+          stats: { totalProjects: 0, totalJurors: round.juryGroup.members.length, assignmentsGenerated: 0, unassignedProjects: 0 },
+          fallbackUsed: false,
+          tokensUsed: 0,
+        }
+      }
+
+      // Load existing assignments
+      const existingAssignments = await ctx.prisma.assignment.findMany({
+        where: { roundId: input.roundId },
+        select: { userId: true, projectId: true },
+      })
+
+      // Load COI records to exclude
+      const coiRecords = await ctx.prisma.conflictOfInterest.findMany({
+        where: { assignment: { roundId: input.roundId }, hasConflict: true },
+        select: { userId: true, projectId: true },
+      })
+      const coiPairs = new Set(coiRecords.map((c: { userId: string; projectId: string }) => `${c.userId}:${c.projectId}`))
+
+      // Build enriched juror data for AI
+      const jurors = round.juryGroup.members.map((m) => ({
+        id: m.user.id,
+        name: m.user.name,
+        email: m.user.email,
+        expertiseTags: (m.user.expertiseTags as string[]) ?? [],
+        bio: m.user.bio as string | null,
+        country: m.user.country as string | null,
+        maxAssignments: (m as any).maxAssignments as number | null ?? null,
+        _count: {
+          assignments: existingAssignments.filter((a) => a.userId === m.user.id).length,
+        },
+      }))
+
+      // Build enriched project data for AI
+      const projects = projectStates.map((ps) => {
+        const p = ps.project as any
+        return {
+          id: p.id as string,
+          title: p.title as string,
+          description: p.description as string | null,
+          tags: (p.projectTags?.map((pt: any) => pt.tag?.name).filter(Boolean) ?? p.tags ?? []) as string[],
+          tagConfidences: p.projectTags?.map((pt: any) => ({
+            name: pt.tag?.name as string,
+            confidence: (pt.confidence as number) ?? 1.0,
+          })) as Array<{ name: string; confidence: number }> | undefined,
+          teamName: p.teamName as string | null,
+          competitionCategory: p.competitionCategory as string | null,
+          oceanIssue: p.oceanIssue as string | null,
+          country: p.country as string | null,
+          institution: p.institution as string | null,
+          teamSize: (p._count?.teamMembers as number) ?? 0,
+          fileTypes: (p.files?.map((f: any) => f.fileType).filter(Boolean) ?? []) as string[],
+          _count: {
+            assignments: existingAssignments.filter((a) => a.projectId === p.id).length,
+          },
+        }
+      })
+
+      // Build constraints
+      const configJson = round.configJson as Record<string, unknown> | null
+      const maxPerJuror = (configJson?.maxAssignmentsPerJuror as number) ?? undefined
+
+      const constraints = {
+        requiredReviewsPerProject: input.requiredReviews,
+        maxAssignmentsPerJuror: maxPerJuror,
+        existingAssignments: existingAssignments.map((a) => ({
+          jurorId: a.userId,
+          projectId: a.projectId,
+        })),
+      }
+
+      // Call AI service
+      const result = await generateAIAssignments(
+        jurors,
+        projects,
+        constraints,
+        ctx.user.id,
+        input.roundId,
+      )
+
+      // Filter out COI pairs and already-assigned pairs
+      const existingPairSet = new Set(existingAssignments.map((a) => `${a.userId}:${a.projectId}`))
+      const filteredSuggestions = result.suggestions.filter((s) =>
+        !coiPairs.has(`${s.jurorId}:${s.projectId}`) &&
+        !existingPairSet.has(`${s.jurorId}:${s.projectId}`)
+      )
+
+      // Map to common AssignmentPreview format
+      const jurorNameMap = new Map(jurors.map((j) => [j.id, j.name ?? 'Unknown']))
+      const projectTitleMap = new Map(projects.map((p) => [p.id, p.title]))
+
+      const assignments = filteredSuggestions.map((s) => ({
+        userId: s.jurorId,
+        userName: jurorNameMap.get(s.jurorId) ?? 'Unknown',
+        projectId: s.projectId,
+        projectTitle: projectTitleMap.get(s.projectId) ?? 'Unknown',
+        score: Math.round(s.confidenceScore * 100),
+        breakdown: {
+          tagOverlap: Math.round(s.expertiseMatchScore * 100),
+          bioMatch: 0,
+          workloadBalance: 0,
+          countryMatch: 0,
+          geoDiversityPenalty: 0,
+          previousRoundFamiliarity: 0,
+          coiPenalty: 0,
+          availabilityPenalty: 0,
+          categoryQuotaPenalty: 0,
+        },
+        reasoning: [s.reasoning],
+        matchingTags: [] as string[],
+        policyViolations: [] as string[],
+        fromIntent: false,
+      }))
+
+      const assignedProjectIds = new Set(assignments.map((a) => a.projectId))
+
+      return {
+        assignments,
+        warnings: result.error ? [result.error] : [],
+        stats: {
+          totalProjects: projects.length,
+          totalJurors: jurors.length,
+          assignmentsGenerated: assignments.length,
+          unassignedProjects: projects.length - assignedProjectIds.size,
+        },
+        fallbackUsed: result.fallbackUsed ?? false,
+        tokensUsed: result.tokensUsed ?? 0,
+      }
+    }),
+
+  /**
+   * Preview round assignments without committing (algorithmic)
    */
   preview: adminProcedure
     .input(

src/server/services/ai-assignment.ts

@@ -35,11 +35,15 @@ const ASSIGNMENT_BATCH_SIZE = 15
 const ASSIGNMENT_SYSTEM_PROMPT = `You are an expert jury assignment optimizer for an ocean conservation competition.
 
 ## Your Role
-Match jurors to projects based on expertise alignment, workload balance, and coverage requirements.
+Match jurors to projects based on expertise alignment, workload balance, geographic diversity, and coverage requirements. You have access to rich data about both jurors and projects — use ALL available information to make optimal assignments.
+
+## Available Data
+- **Jurors**: expertiseTags (areas of expertise), bio (background description with deeper domain knowledge), country, currentAssignmentCount, maxAssignments
+- **Projects**: title, description (detailed project overview), tags (with confidence 0-1), category (e.g. STARTUP, BUSINESS_CONCEPT), oceanIssue (focus area like CORAL_REEFS, POLLUTION), country, institution, teamSize, fileTypes (submitted document types)
 
 ## Matching Criteria (Weighted)
-- Expertise Match (50%): How well juror tags/expertise align with project topics. Project tags include a confidence score (0-1) — weight higher-confidence tags more heavily as they are more reliably assigned. A tag with confidence 0.9 is a strong signal; one with 0.5 is uncertain.
-- Workload Balance (30%): Distribute assignments evenly; prefer jurors below capacity
+- Expertise & Domain Match (50%): How well juror tags, bio, and background align with project topics, category, ocean issue, and description. Use bio text to identify deeper domain expertise beyond explicit tags — e.g., a bio mentioning "20 years of coral research" matches coral-related projects even without explicit tags. Weight higher-confidence tags more heavily.
+- Workload Balance (30%): Distribute assignments as evenly as possible; strongly prefer jurors below capacity. Never let one juror get significantly more assignments than another.
 - Minimum Target (20%): Prioritize jurors who haven't reached their minimum assignment count
 
 ## Output Format
@@ -51,18 +55,20 @@ Return a JSON object:
       "project_id": "PROJECT_001",
       "confidence_score": 0.0-1.0,
       "expertise_match_score": 0.0-1.0,
-      "reasoning": "1-2 sentence justification"
+      "reasoning": "1-2 sentence justification referencing specific expertise matches"
     }
   ]
 }
 
 ## Guidelines
-- Each project should receive the required number of reviews
+- Each project MUST receive the required number of reviews — ensure full coverage
+- Distribute assignments as evenly as possible across all jurors
 - Do not assign jurors who are at or above their capacity
-- Favor geographic and disciplinary diversity in assignments
-- confidence_score reflects overall assignment quality; expertise_match_score reflects tag overlap only
-- A strong match: shared expertise tags + available capacity + under minimum target
-- An acceptable match: related domain + available capacity
+- Favor geographic diversity: avoid assigning jurors from the same country as the project when possible
+- Consider disciplinary diversity: mix different expertise backgrounds per project
+- confidence_score reflects overall assignment quality; expertise_match_score reflects tag/expertise overlap
+- A strong match: shared expertise tags + relevant bio background + available capacity
+- An acceptable match: related domain/ocean issue + available capacity
 - A poor match: no expertise overlap, only assigned for coverage`
 
 // ─── Types ───────────────────────────────────────────────────────────────────
@@ -88,6 +94,8 @@ interface JurorForAssignment {
   name?: string | null
   email: string
   expertiseTags: string[]
+  bio?: string | null
+  country?: string | null
   maxAssignments?: number | null
   _count?: {
     assignments: number
@@ -101,6 +109,12 @@ interface ProjectForAssignment {
   tags: string[]
   tagConfidences?: Array<{ name: string; confidence: number }>
   teamName?: string | null
+  competitionCategory?: string | null
+  oceanIssue?: string | null
+  country?: string | null
+  institution?: string | null
+  teamSize?: number
+  fileTypes?: string[]
   _count?: {
     assignments: number
   }

src/server/services/anonymization.ts

@@ -21,7 +21,7 @@ import type {
 // ─── Description Limits ──────────────────────────────────────────────────────
 
 export const DESCRIPTION_LIMITS = {
-  ASSIGNMENT: 300,
+  ASSIGNMENT: 2000,
   FILTERING: 500,
   ELIGIBILITY: 400,
   MENTOR: 350,
@@ -46,6 +46,8 @@ export interface AnonymizedJuror {
   expertiseTags: string[]
   currentAssignmentCount: number
   maxAssignments: number | null
+  bio?: string | null
+  country?: string | null
 }
 
 export interface AnonymizedProject {
@@ -54,6 +56,12 @@ export interface AnonymizedProject {
   description: string | null
   tags: Array<{ name: string; confidence: number }>
   teamName: string | null
+  category?: string | null
+  oceanIssue?: string | null
+  country?: string | null
+  institution?: string | null
+  teamSize?: number
+  fileTypes?: string[]
 }
 
 export interface JurorMapping {
@@ -200,6 +208,8 @@ interface JurorInput {
   name?: string | null
   email: string
   expertiseTags: string[]
+  bio?: string | null
+  country?: string | null
   maxAssignments?: number | null
   _count?: {
     assignments: number
@@ -213,6 +223,12 @@ interface ProjectInput {
   tags: string[]
   tagConfidences?: Array<{ name: string; confidence: number }>
   teamName?: string | null
+  competitionCategory?: string | null
+  oceanIssue?: string | null
+  country?: string | null
+  institution?: string | null
+  teamSize?: number
+  fileTypes?: string[]
 }
 
 /**
@@ -238,6 +254,8 @@ export function anonymizeForAI(
       expertiseTags: juror.expertiseTags,
       currentAssignmentCount: juror._count?.assignments ?? 0,
       maxAssignments: juror.maxAssignments ?? null,
+      bio: juror.bio ? truncateAndSanitize(juror.bio, 500) : null,
+      country: juror.country ?? null,
     }
   })
 
@@ -260,6 +278,12 @@ export function anonymizeForAI(
           ? project.tagConfidences
           : project.tags.map((t) => ({ name: t, confidence: 1.0 })),
         teamName: project.teamName ? `Team ${index + 1}` : null,
+        category: project.competitionCategory ?? null,
+        oceanIssue: project.oceanIssue ?? null,
+        country: project.country ?? null,
+        institution: project.institution ? sanitizeText(project.institution) : null,
+        teamSize: project.teamSize,
+        fileTypes: project.fileTypes,
       }
     }
   )

src/server/services/round-assignment.ts

@@ -303,19 +303,47 @@ export async function previewRoundAssignment(
     }
   }
 
-  // Sort by score descending
-  suggestions.sort((a, b) => b.score - a.score)
+  // Balance-aware greedy assignment: at each step, pick the best suggestion
+  // while dynamically penalizing jurors who already have more assignments
+  // to distribute work as evenly as possible.
+  const BALANCE_PENALTY_PER_ASSIGNMENT = 25
 
-  // Greedy assignment: pick top suggestions respecting caps
   const finalAssignments: AssignmentSuggestion[] = []
   const finalJurorCounts = new Map(jurorAssignmentCounts)
   const finalProjectCounts = new Map(projectAssignmentCounts)
+  const consumed = new Set<number>()
+
+  while (consumed.size < suggestions.length) {
+    let bestIdx = -1
+    let bestAdjustedScore = -Infinity
+
+    for (let i = 0; i < suggestions.length; i++) {
+      if (consumed.has(i)) continue
+      const s = suggestions[i]
+
+      const projectCount = finalProjectCounts.get(s.projectId) ?? 0
+      if (projectCount >= requiredReviews) {
+        consumed.add(i)
+        continue
+      }
+
+      const jurorCount = finalJurorCounts.get(s.userId) ?? 0
+      // Dynamic balance penalty: penalize jurors who already have more assignments
+      const balancePenalty = jurorCount * BALANCE_PENALTY_PER_ASSIGNMENT
+      const adjustedScore = s.score - balancePenalty
+
+      if (adjustedScore > bestAdjustedScore) {
+        bestAdjustedScore = adjustedScore
+        bestIdx = i
+      }
+    }
+
+    if (bestIdx === -1) break
+
+    const suggestion = suggestions[bestIdx]
+    consumed.add(bestIdx)
 
-  for (const suggestion of suggestions) {
     const jurorCount = finalJurorCounts.get(suggestion.userId) ?? 0
-    const projectCount = finalProjectCounts.get(suggestion.projectId) ?? 0
-
-    if (projectCount >= requiredReviews) continue
 
     // Re-check cap
     const member = members.find((m: any) => m.userId === suggestion.userId)
@@ -334,7 +362,7 @@ export async function previewRoundAssignment(
 
     finalAssignments.push(suggestion)
     finalJurorCounts.set(suggestion.userId, jurorCount + 1)
-    finalProjectCounts.set(suggestion.projectId, projectCount + 1)
+    finalProjectCounts.set(suggestion.projectId, (finalProjectCounts.get(suggestion.projectId) ?? 0) + 1)
   }
 
   const unassignedProjects = projects.filter(