diff --git a/build.ps1 b/build.ps1
index 0fc4e59..9ff38bf 100644
--- a/build.ps1
+++ b/build.ps1
@@ -4,18 +4,51 @@ param(
 
     [string]$GitCodeGuiRepository = 'lzt404/EasyCLIProxyAPI',
 
-    [string]$GitCodeCoreRepository = 'lzt404/CLIProxyAPI'
+    [string]$GitCodeCoreRepository = 'lzt404/CLIProxyAPI',
+
+    [switch]$SkipCopy
 )
 
 Set-StrictMode -Version Latest
 $ErrorActionPreference = 'Stop'
 
 $RootDir = $PSScriptRoot
-$AppBin = Join-Path $RootDir 'src-tauri\target\release\cpa-gui.exe'
+$TargetDir = Join-Path $RootDir 'src-tauri\target'
+$BuildRootMarker = Join-Path $TargetDir '.build-workspace-root'
+$AppBin = Join-Path $TargetDir 'release\cpa-gui.exe'
 $CopyScript = Join-Path $RootDir 'copy.ps1'
 
 Set-Location -LiteralPath $RootDir
 
+function Test-StaleTauriBuildCache {
+    param([string]$BuildDir, [string]$TargetDir)
+
+    if (-not (Test-Path -LiteralPath $BuildDir -PathType Container)) {
+        return $false
+    }
+
+    $TargetPrefix = $TargetDir.TrimEnd('\', '/') + [IO.Path]::DirectorySeparatorChar
+    foreach ($directory in Get-ChildItem -LiteralPath $BuildDir -Directory -Filter 'tauri-*') {
+        $output = Join-Path $directory.FullName 'output'
+        if (-not (Test-Path -LiteralPath $output -PathType Leaf)) {
+            continue
+        }
+        foreach ($line in [IO.File]::ReadLines($output)) {
+            $marker = 'PERMISSION_FILES_PATH='
+            $position = $line.IndexOf($marker, [StringComparison]::Ordinal)
+            if ($position -lt 0) {
+                continue
+            }
+            $permissionPath = $line.Substring($position + $marker.Length).Trim()
+            if (-not $permissionPath.StartsWith($TargetPrefix, [StringComparison]::OrdinalIgnoreCase) -or
+                -not (Test-Path -LiteralPath $permissionPath)) {
+                return $true
+            }
+        }
+    }
+    return $false
+}
+
 if (-not $PSBoundParameters.ContainsKey('BuildJobs')) {
     $BuildJobs = if ($env:CARGO_BUILD_JOBS) {
         [int]$env:CARGO_BUILD_JOBS
@@ -42,24 +75,62 @@ Write-Host "Cargo build jobs: $BuildJobs"
 Write-Host "GitCode GUI fallback repository: $GitCodeGuiRepository"
 Write-Host "GitCode core fallback repository: $GitCodeCoreRepository"
 
+$CachedRoot = if (Test-Path -LiteralPath $BuildRootMarker -PathType Leaf) {
+    (Get-Content -LiteralPath $BuildRootMarker -Raw).Trim()
+}
+else {
+    ''
+}
+if (-not $CachedRoot.Equals($RootDir, [StringComparison]::OrdinalIgnoreCase) -and
+    (Test-StaleTauriBuildCache -BuildDir (Join-Path $TargetDir 'release\build') -TargetDir $TargetDir)) {
+    $ExpectedTargetDir = [IO.Path]::GetFullPath((Join-Path $RootDir 'src-tauri\target'))
+    $ResolvedTargetDir = (Resolve-Path -LiteralPath $TargetDir).Path
+    if (-not $ResolvedTargetDir.Equals($ExpectedTargetDir, [StringComparison]::OrdinalIgnoreCase)) {
+        throw "Refusing to clean an unexpected Cargo target directory: $ResolvedTargetDir"
+    }
+    if (-not (Get-Command cargo -ErrorAction SilentlyContinue)) {
+        throw 'cargo is required to refresh the stale Tauri build cache.'
+    }
+    Write-Host 'Tauri release cache references a previous workspace path; rebuilding its generated permissions.'
+    for ($attempt = 1; $attempt -le 3; $attempt++) {
+        & cargo clean --manifest-path (Join-Path $RootDir 'src-tauri\Cargo.toml') --target-dir $TargetDir -p tauri --release
+        if ($LASTEXITCODE -eq 0) {
+            break
+        }
+        if ($attempt -eq 3) {
+            throw "Failed to refresh the Tauri release cache (exit code $LASTEXITCODE)."
+        }
+        Start-Sleep -Seconds $attempt
+    }
+}
+
 & bun install
 if ($LASTEXITCODE -ne 0) {
     throw "bun install failed with exit code $LASTEXITCODE."
 }
 
 $PreviousBuildJobs = $env:CARGO_BUILD_JOBS
+$PreviousCargoTargetDir = $env:CARGO_TARGET_DIR
 $PreviousGitCodeGuiRepository = $env:GITCODE_GUI_REPOSITORY
 $PreviousGitCodeCoreRepository = $env:GITCODE_CORE_REPOSITORY
 try {
     $env:CARGO_BUILD_JOBS = [string]$BuildJobs
+    $env:CARGO_TARGET_DIR = $TargetDir
     $env:GITCODE_GUI_REPOSITORY = $GitCodeGuiRepository
     $env:GITCODE_CORE_REPOSITORY = $GitCodeCoreRepository
     & bun tauri build --no-bundle
     if ($LASTEXITCODE -ne 0) {
         throw "Tauri build failed with exit code $LASTEXITCODE."
     }
+    [IO.File]::WriteAllText($BuildRootMarker, $RootDir, [Text.UTF8Encoding]::new($false))
 }
 finally {
+    if ($null -eq $PreviousCargoTargetDir) {
+        Remove-Item Env:CARGO_TARGET_DIR -ErrorAction SilentlyContinue
+    }
+    else {
+        $env:CARGO_TARGET_DIR = $PreviousCargoTargetDir
+    }
     if ($null -eq $PreviousBuildJobs) {
         Remove-Item Env:CARGO_BUILD_JOBS -ErrorAction SilentlyContinue
     }
@@ -85,4 +156,9 @@ if (-not (Test-Path -LiteralPath $AppBin -PathType Leaf)) {
 }
 
 Write-Host "Built: $AppBin"
-& $CopyScript
+if ($SkipCopy) {
+    Write-Host 'Portable copy skipped; run .\copy.ps1 after closing the running app.'
+}
+else {
+    & $CopyScript
+}