diff --git a/.github/agents/pr/SHARED-RULES.md b/.github/agents/pr/SHARED-RULES.md
index 6f9b1a0827c2..4a5f547f0422 100644
--- a/.github/agents/pr/SHARED-RULES.md
+++ b/.github/agents/pr/SHARED-RULES.md
@@ -119,6 +119,43 @@ EOF
 
 ---
 
+## Agent Labels (Automated by Review-PR.ps1)
+
+After all phases complete, `Review-PR.ps1` automatically applies GitHub labels based on phase outcomes. The agent does NOT need to apply labels — just write accurate `content.md` files.
+
+### Label Categories
+
+**Outcome labels** (mutually exclusive — exactly one per PR):
+| Label | When Applied |
+|-------|-------------|
+| `s/agent-approved` | Report recommends APPROVE |
+| `s/agent-changes-requested` | Report recommends REQUEST CHANGES |
+| `s/agent-review-incomplete` | Agent didn't complete all phases |
+
+**Signal labels** (additive — multiple can coexist):
+| Label | When Applied |
+|-------|-------------|
+| `s/agent-gate-passed` | Gate phase passes |
+| `s/agent-gate-failed` | Gate phase fails |
+| `s/agent-fix-win` | Agent found a better alternative fix than the PR |
+| `s/agent-fix-pr-picked` | PR's fix is the best — agent couldn't beat it |
+
+**Tracking label** (always applied):
+| Label | When Applied |
+|-------|-------------|
+| `s/agent-reviewed` | Every completed agent run |
+
+### How Labels Are Determined
+
+Labels are parsed from `content.md` files:
+- **Outcome**: from `report/content.md` — looks for `Final Recommendation: APPROVE` or `REQUEST CHANGES`
+- **Gate**: from `gate/content.md` — looks for `PASSED` or `FAILED`
+- **Fix**: from `try-fix/content.md` — looks for alternative selected (win = agent beat PR) vs `Selected Fix: PR` (lose = PR was best)
+
+**Agent responsibility**: Write clear, parseable `content.md` with standard markers (`✅ PASSED`, `❌ FAILED`, `Selected Fix: PR`, `Final Recommendation: APPROVE`).
+
+---
+
 ## No Direct Git Commands
 
 **Never run git commands that change branch or file state.**
diff --git a/.github/docs/agent-labels.md b/.github/docs/agent-labels.md
new file mode 100644
index 000000000000..7025d26f8f2e
--- /dev/null
+++ b/.github/docs/agent-labels.md
@@ -0,0 +1,171 @@
+# Agent Workflow Labels
+
+GitHub labels for tracking outcomes of the AI agent PR review workflow (`Review-PR.ps1`).
+
+All labels use the **`s/agent-*`** prefix for easy querying on GitHub.
+
+---
+
+## Label Categories
+
+### Outcome Labels
+
+Mutually exclusive — exactly **one** is applied per PR review run.
+
+| Label | Color | Description | Applied When |
+|-------|-------|-------------|--------------|
+| `s/agent-approved` | 🟢 `#2E7D32` | AI agent recommends approval — PR fix is correct and optimal | Report phase recommends APPROVE |
+| `s/agent-changes-requested` | 🟠 `#E65100` | AI agent recommends changes — found a better alternative or issues | Report phase recommends REQUEST CHANGES |
+| `s/agent-review-incomplete` | 🔴 `#B71C1C` | AI agent could not complete all phases (blocker, timeout, error) | Agent exits without completing all phases |
+
+When a new outcome label is applied, any previously applied outcome label is automatically removed.
+
+### Signal Labels
+
+Additive — **multiple** can coexist on a single PR.
+
+| Label | Color | Description | Applied When |
+|-------|-------|-------------|--------------|
+| `s/agent-gate-passed` | 🟢 `#4CAF50` | AI verified tests catch the bug (fail without fix, pass with fix) | Gate phase passes |
+| `s/agent-gate-failed` | 🟠 `#FF9800` | AI could not verify tests catch the bug | Gate phase fails |
+| `s/agent-fix-win` | 🟢 `#66BB6A` | AI found a better alternative fix than the PR | Fix phase: alternative selected over PR's fix |
+| `s/agent-fix-pr-picked` | 🟠 `#FF7043` | AI could not beat the PR fix — PR is the best among all candidates | Fix phase: PR selected as best after comparison |
+
+Gate labels (`gate-passed`/`gate-failed`) are mutually exclusive with each other. Fix labels (`fix-win`/`fix-lose`) are mutually exclusive with each other.
+
+### Tracking Label
+
+Always applied on every completed agent run.
+
+| Label | Color | Description | Applied When |
+|-------|-------|-------------|--------------|
+| `s/agent-reviewed` | 🔵 `#1565C0` | PR was reviewed by AI agent workflow (full 4-phase review) | Every completed agent run |
+
+### Manual Label
+
+Applied by MAUI maintainers, not by automation.
+
+| Label | Color | Description | Applied When |
+|-------|-------|-------------|--------------|
+| `s/agent-fix-implemented` | 🟣 `#7B1FA2` | PR author implemented the agent's suggested fix | Maintainer applies when PR author adopts agent's recommendation |
+
+---
+
+## How It Works
+
+### Architecture
+
+```
+Review-PR.ps1
+├── Phase 1: PR Agent Review (Copilot CLI)
+│   ├── Pre-Flight → writes content.md
+│   ├── Gate       → writes content.md
+│   ├── Fix        → writes content.md
+│   └── Report     → writes content.md
+├── Phase 2: PR Finalize (optional)
+├── Phase 3: Post Comments (optional)
+└── Phase 4: Apply Labels  ← labels are applied here
+    ├── Parse content.md files
+    ├── Determine outcome + signal labels
+    ├── Apply via GitHub REST API
+    └── Non-fatal: errors warn but don't fail the workflow
+```
+
+Labels are applied exclusively from `Review-PR.ps1` Phase 4. No other script applies agent labels. This single-source design avoids label conflicts and simplifies debugging.
+
+### How Labels Are Parsed
+
+The `Parse-PhaseOutcomes` function in `Update-AgentLabels.ps1` reads `content.md` files from each phase directory:
+
+| Source File | What's Parsed | Resulting Label |
+|-------------|---------------|-----------------|
+| `gate/content.md` | `**Result:** ✅ PASSED` | `s/agent-gate-passed` |
+| `gate/content.md` | `**Result:** ❌ FAILED` | `s/agent-gate-failed` |
+| `try-fix/content.md` | `**Selected Fix:** Candidate ...` | `s/agent-fix-win` |
+| `try-fix/content.md` | `**Selected Fix:** PR ...` | `s/agent-fix-pr-picked` |
+| `report/content.md` | `Final Recommendation: APPROVE` | `s/agent-approved` |
+| `report/content.md` | `Final Recommendation: REQUEST CHANGES` | `s/agent-changes-requested` |
+| *(missing report)* | No report file exists | `s/agent-review-incomplete` |
+
+### Self-Bootstrapping
+
+Labels are created automatically on first use via `Ensure-LabelExists`. No manual setup required. If a label already exists but has a stale description or color, it is updated.
+
+---
+
+## Querying Labels
+
+All labels use the `s/agent-*` prefix, making them easy to filter on GitHub.
+
+### Common Queries
+
+```
+# PRs the agent approved
+is:pr label:s/agent-approved
+
+# PRs where agent found a better fix
+is:pr label:s/agent-fix-pr-picked
+
+# PRs where agent found better fix AND author implemented it
+is:pr label:s/agent-changes-requested label:s/agent-fix-implemented
+
+# PRs where tests don't catch the bug
+is:pr label:s/agent-gate-failed
+
+# Agent-reviewed PRs that are still open
+is:pr is:open label:s/agent-reviewed
+
+# All agent-reviewed PRs (total count)
+is:pr label:s/agent-reviewed
+```
+
+### Metrics You Can Derive
+
+| Metric | Query |
+|--------|-------|
+| Total agent reviews | `is:pr label:s/agent-reviewed` |
+| Approval rate | Compare `label:s/agent-approved` vs `label:s/agent-changes-requested` counts |
+| Gate pass rate | Compare `label:s/agent-gate-passed` vs `label:s/agent-gate-failed` counts |
+| Fix win rate | Compare `label:s/agent-fix-win` vs `label:s/agent-fix-pr-picked` counts |
+| Agent adoption rate | `label:s/agent-fix-implemented` / `label:s/agent-changes-requested` |
+| Incomplete review rate | `label:s/agent-review-incomplete` / `label:s/agent-reviewed` |
+
+---
+
+## Implementation Details
+
+### Files
+
+| File | Purpose |
+|------|---------|
+| `.github/scripts/shared/Update-AgentLabels.ps1` | Label helper module (all label logic) |
+| `.github/scripts/Review-PR.ps1` | Orchestrator that calls `Apply-AgentLabels` in Phase 4 |
+| `.github/agents/pr/SHARED-RULES.md` | Documents label system for the PR agent |
+
+### Key Functions
+
+| Function | Description |
+|----------|-------------|
+| `Apply-AgentLabels` | Main entry point — parses phases and applies all labels |
+| `Parse-PhaseOutcomes` | Reads `content.md` files, returns outcome/gate/fix results |
+| `Update-AgentOutcomeLabel` | Applies one outcome label, removes conflicting ones |
+| `Update-AgentSignalLabels` | Adds/removes gate and fix signal labels |
+| `Update-AgentReviewedLabel` | Ensures tracking label is present |
+| `Ensure-LabelExists` | Creates or updates a label in the repository |
+
+### Design Principles
+
+- **Idempotent**: Safe to re-run — checks before add/remove, GitHub ignores duplicate adds
+- **Non-fatal**: Label failures emit warnings but never fail the overall workflow
+- **Single source**: All labels applied from `Review-PR.ps1` only — no other scripts touch labels
+- **Self-bootstrapping**: Labels are created on first use via GitHub API
+- **Mutual exclusivity enforced**: Outcome labels and same-category signal labels automatically remove their counterpart
+
+---
+
+## Migrated From
+
+The following old infrastructure was removed as part of this implementation:
+
+- **`Update-VerificationLabels`** function in `verify-tests-fail.ps1` — removed (labels now come from `Review-PR.ps1` only)
+- **`s/ai-reproduction-confirmed`** / **`s/ai-reproduction-failed`** labels — superseded by `s/agent-gate-passed` / `s/agent-gate-failed`
diff --git a/.github/scripts/Review-PR.ps1 b/.github/scripts/Review-PR.ps1
index 0844fafb5893..9a83d73634b2 100644
--- a/.github/scripts/Review-PR.ps1
+++ b/.github/scripts/Review-PR.ps1
@@ -531,6 +531,30 @@ if ($DryRun) {
             }
         }
 
+        # Phase 4: Apply Labels
+        Write-Host ""
+        Write-Host "╔═══════════════════════════════════════════════════════════╗" -ForegroundColor Blue
+        Write-Host "║  PHASE 4: APPLY LABELS                                    ║" -ForegroundColor Blue
+        Write-Host "╚═══════════════════════════════════════════════════════════╝" -ForegroundColor Blue
+        Write-Host ""
+
+        $labelHelperPath = Join-Path $RepoRoot ".github/scripts/shared/Update-AgentLabels.ps1"
+        if (-not (Test-Path $labelHelperPath)) {
+            Write-Host "⚠️ Label helper missing, attempting targeted recovery..." -ForegroundColor Yellow
+            git checkout $savedHead -- $labelHelperPath 2>&1 | Out-Null
+        }
+
+        if (Test-Path $labelHelperPath) {
+            try {
+                . $labelHelperPath
+                Apply-AgentLabels -PRNumber $PRNumber -RepoRoot $RepoRoot
+            }
+            catch {
+                Write-Host "⚠️ Label application failed (non-fatal): $_" -ForegroundColor Yellow
+            }
+        } else {
+            Write-Host "⚠️ Label helper not found at: $labelHelperPath — skipping labels" -ForegroundColor Yellow
+        }
     }
 }
 
diff --git a/.github/scripts/shared/Update-AgentLabels.ps1 b/.github/scripts/shared/Update-AgentLabels.ps1
new file mode 100644
index 000000000000..818992fc00ff
--- /dev/null
+++ b/.github/scripts/shared/Update-AgentLabels.ps1
@@ -0,0 +1,460 @@
+#!/usr/bin/env pwsh
+<#
+.SYNOPSIS
+    Shared functions for managing agent workflow labels on GitHub PRs.
+
+.DESCRIPTION
+    Provides idempotent label management for the PR agent review workflow.
+    Labels use the 's/agent-*' prefix convention for easy querying.
+
+    Label categories:
+    - Outcome labels (mutually exclusive): agent-approved, agent-changes-requested, agent-review-incomplete
+    - Signal labels (additive): agent-gate-passed, agent-gate-failed, agent-fix-win, agent-fix-pr-picked
+    - Manual labels (applied by maintainers): agent-fix-implemented
+    - Tracking label: agent-reviewed (always applied on completed run)
+
+.NOTES
+    All functions are designed to be non-fatal: label failures emit warnings
+    but do not throw or exit with error codes.
+#>
+
+# ============================================================
+# Label definitions
+# ============================================================
+
+$script:OutcomeLabels = @{
+    's/agent-approved'          = @{ Description = 'AI agent recommends approval - PR fix is correct and optimal'; Color = '2E7D32' }
+    's/agent-changes-requested' = @{ Description = 'AI agent recommends changes - found a better alternative or issues'; Color = 'E65100' }
+    's/agent-review-incomplete' = @{ Description = 'AI agent could not complete all phases (blocker, timeout, error)'; Color = 'B71C1C' }
+}
+
+$script:SignalLabels = @{
+    's/agent-gate-passed' = @{ Description = 'AI verified tests catch the bug (fail without fix, pass with fix)'; Color = '4CAF50' }
+    's/agent-gate-failed' = @{ Description = 'AI could not verify tests catch the bug'; Color = 'FF9800' }
+    's/agent-fix-win'     = @{ Description = 'AI found a better alternative fix than the PR'; Color = '66BB6A' }
+    's/agent-fix-pr-picked'    = @{ Description = 'AI could not beat the PR fix - PR is the best among all candidates'; Color = 'FF7043' }
+}
+
+$script:ManualLabels = @{
+    's/agent-fix-implemented' = @{ Description = 'PR author implemented the agent suggested fix'; Color = '7B1FA2' }
+}
+
+$script:TrackingLabel = @{
+    's/agent-reviewed' = @{ Description = 'PR was reviewed by AI agent workflow (full 4-phase review)'; Color = '1565C0' }
+}
+
+# All label definitions combined
+$script:AllLabelDefs = @{}
+foreach ($group in @($script:OutcomeLabels, $script:SignalLabels, $script:ManualLabels, $script:TrackingLabel)) {
+    foreach ($key in $group.Keys) {
+        $script:AllLabelDefs[$key] = $group[$key]
+    }
+}
+
+# ============================================================
+# Helper: Ensure a label exists in the repository
+# ============================================================
+function Ensure-LabelExists {
+    <#
+    .SYNOPSIS
+        Creates a label in the repository if it doesn't already exist.
+        Updates description/color if the label exists but has stale metadata.
+    #>
+    param(
+        [Parameter(Mandatory)] [string]$LabelName,
+        [Parameter(Mandatory)] [string]$Description,
+        [Parameter(Mandatory)] [string]$Color,
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    try {
+        # Check if label exists
+        $existing = gh api "repos/$Owner/$Repo/labels/$([uri]::EscapeDataString($LabelName))" 2>$null | ConvertFrom-Json
+        if ($LASTEXITCODE -eq 0 -and $existing) {
+            # Label exists — update if description or color changed
+            $needsUpdate = ($existing.description -ne $Description) -or ($existing.color -ne $Color)
+            if ($needsUpdate) {
+                gh api "repos/$Owner/$Repo/labels/$([uri]::EscapeDataString($LabelName))" `
+                    --method PATCH `
+                    -f description="$Description" `
+                    -f color="$Color" 2>$null | Out-Null
+                Write-Host "  🏷️  Updated label: $LabelName" -ForegroundColor Gray
+            }
+        } else {
+            # Label doesn't exist — create it
+            gh api "repos/$Owner/$Repo/labels" `
+                --method POST `
+                -f name="$LabelName" `
+                -f description="$Description" `
+                -f color="$Color" 2>$null | Out-Null
+            if ($LASTEXITCODE -eq 0) {
+                Write-Host "  🏷️  Created label: $LabelName" -ForegroundColor Green
+            } else {
+                Write-Host "  ⚠️  Failed to create label: $LabelName" -ForegroundColor Yellow
+            }
+        }
+    }
+    catch {
+        Write-Host "  ⚠️  Label operation failed for '$LabelName': $_" -ForegroundColor Yellow
+    }
+}
+
+# ============================================================
+# Helper: Get current agent labels on a PR
+# ============================================================
+function Get-AgentLabels {
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    $labels = gh api "repos/$Owner/$Repo/issues/$PRNumber/labels" --jq '.[].name' 2>$null
+    if ($LASTEXITCODE -ne 0) { return @() }
+    return @($labels | Where-Object { $_ -like 's/agent-*' })
+}
+
+# ============================================================
+# Helper: Add a label to a PR
+# ============================================================
+function Add-Label {
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [Parameter(Mandatory)] [string]$LabelName,
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    gh api "repos/$Owner/$Repo/issues/$PRNumber/labels" `
+        --method POST `
+        -f "labels[]=$LabelName" 2>$null | Out-Null
+    return $LASTEXITCODE -eq 0
+}
+
+# ============================================================
+# Helper: Remove a label from a PR
+# ============================================================
+function Remove-Label {
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [Parameter(Mandatory)] [string]$LabelName,
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    gh api "repos/$Owner/$Repo/issues/$PRNumber/labels/$([uri]::EscapeDataString($LabelName))" `
+        --method DELETE 2>$null | Out-Null
+    return $LASTEXITCODE -eq 0
+}
+
+# ============================================================
+# Update-AgentOutcomeLabel
+# ============================================================
+function Update-AgentOutcomeLabel {
+    <#
+    .SYNOPSIS
+        Applies exactly one outcome label, removing any conflicting outcome labels.
+
+    .PARAMETER Outcome
+        One of: 'approved', 'changes-requested', 'review-incomplete'
+    #>
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [Parameter(Mandatory)]
+        [ValidateSet('approved', 'changes-requested', 'review-incomplete')]
+        [string]$Outcome,
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    $targetLabel = "s/agent-$Outcome"
+    Write-Host "  📌 Outcome: $targetLabel" -ForegroundColor Cyan
+
+    # Ensure the target label exists in the repo
+    $def = $script:OutcomeLabels[$targetLabel]
+    Ensure-LabelExists -LabelName $targetLabel -Description $def.Description -Color $def.Color -Owner $Owner -Repo $Repo
+
+    # Get current labels on the PR
+    $currentLabels = Get-AgentLabels -PRNumber $PRNumber -Owner $Owner -Repo $Repo
+
+    # Remove conflicting outcome labels
+    foreach ($olName in $script:OutcomeLabels.Keys) {
+        if ($olName -ne $targetLabel -and $currentLabels -contains $olName) {
+            Write-Host "  🗑️  Removing stale: $olName" -ForegroundColor Yellow
+            Remove-Label -PRNumber $PRNumber -LabelName $olName -Owner $Owner -Repo $Repo
+        }
+    }
+
+    # Add the target label (idempotent — GitHub ignores duplicates)
+    if ($currentLabels -notcontains $targetLabel) {
+        $ok = Add-Label -PRNumber $PRNumber -LabelName $targetLabel -Owner $Owner -Repo $Repo
+        if ($ok) {
+            Write-Host "  ✅ Applied: $targetLabel" -ForegroundColor Green
+        } else {
+            Write-Host "  ⚠️  Failed to apply: $targetLabel" -ForegroundColor Yellow
+        }
+    } else {
+        Write-Host "  ✅ Already present: $targetLabel" -ForegroundColor Green
+    }
+}
+
+# ============================================================
+# Update-AgentSignalLabels
+# ============================================================
+function Update-AgentSignalLabels {
+    <#
+    .SYNOPSIS
+        Adds or removes signal labels based on phase results.
+
+    .PARAMETER GateResult
+        Gate phase result: 'passed', 'failed', or $null (skipped)
+
+    .PARAMETER FixResult
+        Fix phase result: 'win' (PR best), 'lose' (alternative better), or $null (skipped)
+    #>
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [string]$GateResult,    # 'passed', 'failed', or $null
+        [string]$FixResult,     # 'win' (agent found better alternative), 'lose' (PR is best), or $null
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    $currentLabels = Get-AgentLabels -PRNumber $PRNumber -Owner $Owner -Repo $Repo
+
+    # --- Gate labels ---
+    if ($GateResult -eq 'passed') {
+        $label = 's/agent-gate-passed'
+        $def = $script:SignalLabels[$label]
+        Ensure-LabelExists -LabelName $label -Description $def.Description -Color $def.Color -Owner $Owner -Repo $Repo
+
+        # Add gate-passed, remove gate-failed
+        if ($currentLabels -notcontains $label) {
+            Add-Label -PRNumber $PRNumber -LabelName $label -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  ✅ Signal: $label" -ForegroundColor Green
+        }
+        if ($currentLabels -contains 's/agent-gate-failed') {
+            Remove-Label -PRNumber $PRNumber -LabelName 's/agent-gate-failed' -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  🗑️  Removed stale: s/agent-gate-failed" -ForegroundColor Yellow
+        }
+    }
+    elseif ($GateResult -eq 'failed') {
+        $label = 's/agent-gate-failed'
+        $def = $script:SignalLabels[$label]
+        Ensure-LabelExists -LabelName $label -Description $def.Description -Color $def.Color -Owner $Owner -Repo $Repo
+
+        # Add gate-failed, remove gate-passed
+        if ($currentLabels -notcontains $label) {
+            Add-Label -PRNumber $PRNumber -LabelName $label -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  ✅ Signal: $label" -ForegroundColor Green
+        }
+        if ($currentLabels -contains 's/agent-gate-passed') {
+            Remove-Label -PRNumber $PRNumber -LabelName 's/agent-gate-passed' -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  🗑️  Removed stale: s/agent-gate-passed" -ForegroundColor Yellow
+        }
+    }
+
+    # --- Fix labels ---
+    if ($FixResult -eq 'win') {
+        $label = 's/agent-fix-win'
+        $def = $script:SignalLabels[$label]
+        Ensure-LabelExists -LabelName $label -Description $def.Description -Color $def.Color -Owner $Owner -Repo $Repo
+
+        if ($currentLabels -notcontains $label) {
+            Add-Label -PRNumber $PRNumber -LabelName $label -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  ✅ Signal: $label" -ForegroundColor Green
+        }
+        if ($currentLabels -contains 's/agent-fix-pr-picked') {
+            Remove-Label -PRNumber $PRNumber -LabelName 's/agent-fix-pr-picked' -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  🗑️  Removed stale: s/agent-fix-pr-picked" -ForegroundColor Yellow
+        }
+    }
+    elseif ($FixResult -eq 'lose') {
+        $label = 's/agent-fix-pr-picked'
+        $def = $script:SignalLabels[$label]
+        Ensure-LabelExists -LabelName $label -Description $def.Description -Color $def.Color -Owner $Owner -Repo $Repo
+
+        if ($currentLabels -notcontains $label) {
+            Add-Label -PRNumber $PRNumber -LabelName $label -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  ✅ Signal: $label" -ForegroundColor Green
+        }
+        if ($currentLabels -contains 's/agent-fix-win') {
+            Remove-Label -PRNumber $PRNumber -LabelName 's/agent-fix-win' -Owner $Owner -Repo $Repo | Out-Null
+            Write-Host "  🗑️  Removed stale: s/agent-fix-win" -ForegroundColor Yellow
+        }
+    }
+}
+
+# ============================================================
+# Update-AgentReviewedLabel
+# ============================================================
+function Update-AgentReviewedLabel {
+    <#
+    .SYNOPSIS
+        Ensures the s/agent-reviewed tracking label is on the PR.
+    #>
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    $label = 's/agent-reviewed'
+    $def = $script:TrackingLabel[$label]
+    Ensure-LabelExists -LabelName $label -Description $def.Description -Color $def.Color -Owner $Owner -Repo $Repo
+
+    $currentLabels = Get-AgentLabels -PRNumber $PRNumber -Owner $Owner -Repo $Repo
+    if ($currentLabels -notcontains $label) {
+        $ok = Add-Label -PRNumber $PRNumber -LabelName $label -Owner $Owner -Repo $Repo
+        if ($ok) {
+            Write-Host "  ✅ Tracking: $label" -ForegroundColor Green
+        } else {
+            Write-Host "  ⚠️  Failed to apply: $label" -ForegroundColor Yellow
+        }
+    } else {
+        Write-Host "  ✅ Already present: $label" -ForegroundColor Green
+    }
+}
+
+# ============================================================
+# Parse-PhaseOutcomes — read content.md files to determine labels
+# ============================================================
+function Parse-PhaseOutcomes {
+    <#
+    .SYNOPSIS
+        Reads phase output content.md files and determines outcome + signal labels.
+
+    .OUTPUTS
+        Hashtable with keys: Outcome, GateResult, FixResult
+    #>
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [string]$RepoRoot = (git rev-parse --show-toplevel 2>$null)
+    )
+
+    $baseDir = Join-Path $RepoRoot "CustomAgentLogsTmp/PRState/$PRNumber/PRAgent"
+    $result = @{
+        Outcome    = $null  # 'approved', 'changes-requested', 'review-incomplete'
+        GateResult = $null  # 'passed', 'failed'
+        FixResult  = $null  # 'win', 'lose'
+    }
+
+    # --- Parse Gate content.md ---
+    $gateFile = Join-Path $baseDir "gate/content.md"
+    if (Test-Path $gateFile) {
+        $gateContent = Get-Content $gateFile -Raw -ErrorAction SilentlyContinue
+        if ($gateContent) {
+            # Match the Result line specifically to avoid false matches from other text
+            if ($gateContent -match '(?im)^\*?\*?Result\*?\*?:.*(?:✅|PASSED)') {
+                $result.GateResult = 'passed'
+            }
+            elseif ($gateContent -match '(?im)^\*?\*?Result\*?\*?:.*(?:❌|FAILED|SKIPPED)') {
+                $result.GateResult = 'failed'
+            }
+        }
+    }
+
+    # --- Parse try-fix content.md for fix result ---
+    $fixFile = Join-Path $baseDir "try-fix/content.md"
+    if (Test-Path $fixFile) {
+        $fixContent = Get-Content $fixFile -Raw -ErrorAction SilentlyContinue
+        if ($fixContent) {
+            # Extract just the fix name (before any reason separator like " — ")
+            # to avoid false matches from reason text containing keywords like "try-fix" or "alternative"
+            if ($fixContent -match '(?i)Selected Fix:\s*\*?\*?\s*(.+?)(?:\s*—|\s*$)') {
+                $fixName = $matches[1].Trim()
+                # Agent wins: fix name starts with Candidate/Alternative/try-fix
+                if ($fixName -match '(?i)^(?:Candidate|Alternative|try-fix)') {
+                    $result.FixResult = 'win'
+                }
+                # Agent loses: fix name starts with PR
+                elseif ($fixName -match '(?i)^(?:\*?\*?\s*)?PR\b') {
+                    $result.FixResult = 'lose'
+                }
+            }
+        }
+    }
+
+    # --- Parse report content.md for outcome ---
+    $reportFile = Join-Path $baseDir "report/content.md"
+    if (Test-Path $reportFile) {
+        $reportContent = Get-Content $reportFile -Raw -ErrorAction SilentlyContinue
+        if ($reportContent) {
+            if ($reportContent -match '(?i)Final\s+Recommendation:\s*APPROVE|✅\s*Final\s+Recommendation:\s*APPROVE') {
+                $result.Outcome = 'approved'
+            }
+            elseif ($reportContent -match '(?i)Final\s+Recommendation:\s*REQUEST.CHANGES|⚠️\s*Final\s+Recommendation:\s*REQUEST.CHANGES') {
+                $result.Outcome = 'changes-requested'
+            }
+            else {
+                $result.Outcome = 'review-incomplete'
+            }
+        } else {
+            $result.Outcome = 'review-incomplete'
+        }
+    } else {
+        # No report means the agent didn't finish
+        $result.Outcome = 'review-incomplete'
+    }
+
+    return $result
+}
+
+# ============================================================
+# Apply-AgentLabels — main entry point
+# ============================================================
+function Apply-AgentLabels {
+    <#
+    .SYNOPSIS
+        Main entry point: parses phase outputs and applies all appropriate labels.
+
+    .DESCRIPTION
+        1. Parses content.md files from each phase
+        2. Applies exactly one outcome label
+        3. Applies signal labels based on phase results
+        4. Always applies s/agent-reviewed
+
+    .PARAMETER PRNumber
+        The GitHub PR number.
+
+    .PARAMETER RepoRoot
+        Repository root path. Defaults to git rev-parse --show-toplevel.
+    #>
+    param(
+        [Parameter(Mandatory)] [string]$PRNumber,
+        [string]$RepoRoot = (git rev-parse --show-toplevel 2>$null),
+        [string]$Owner = 'dotnet',
+        [string]$Repo = 'maui'
+    )
+
+    Write-Host ""
+    Write-Host "🏷️  Applying agent labels to PR #$PRNumber..." -ForegroundColor Cyan
+
+    # Parse phase outcomes from content.md files
+    $outcomes = Parse-PhaseOutcomes -PRNumber $PRNumber -RepoRoot $RepoRoot
+    Write-Host "  📊 Parsed outcomes:" -ForegroundColor Gray
+    Write-Host "     Outcome:    $($outcomes.Outcome ?? '(none)')" -ForegroundColor Gray
+    Write-Host "     Gate:       $($outcomes.GateResult ?? '(skipped)')" -ForegroundColor Gray
+    Write-Host "     Fix:        $($outcomes.FixResult ?? '(skipped)')" -ForegroundColor Gray
+
+    try {
+        # 1. Apply outcome label (exactly one)
+        if ($outcomes.Outcome) {
+            Update-AgentOutcomeLabel -PRNumber $PRNumber -Outcome $outcomes.Outcome -Owner $Owner -Repo $Repo
+        }
+
+        # 2. Apply signal labels
+        Update-AgentSignalLabels -PRNumber $PRNumber -GateResult $outcomes.GateResult -FixResult $outcomes.FixResult -Owner $Owner -Repo $Repo
+
+        # 3. Always apply tracking label
+        Update-AgentReviewedLabel -PRNumber $PRNumber -Owner $Owner -Repo $Repo
+
+        Write-Host ""
+        Write-Host "  ✅ Labels applied successfully" -ForegroundColor Green
+    }
+    catch {
+        Write-Host ""
+        Write-Host "  ⚠️  Label application error (non-fatal): $_" -ForegroundColor Yellow
+    }
+}