diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index 4600ff4b..a50c6c2c 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -18,9 +18,6 @@ jobs:
           # - "3.12"
           # - "3.13"
     runs-on: "${{ matrix.github_actions_runner }}"
-    env:
-      LOCK: true
-      TEST: true
     steps:
       - if: startsWith(matrix.github_actions_runner, 'ubuntu-')
         name: Install PySide6 system dependencies
@@ -34,16 +31,22 @@ jobs:
       - uses: "actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c" # v5.0.0
         with:
           python-version: "${{ matrix.python_version }}"
-      - run: ".tools/sync.ps1"
+      - run: ". .tools/sync.ps1"
+        shell: "pwsh"
+      - run: "SETUP"
+        shell: "pwsh"
+      - run: "CI_ONLY_SETUP"
+        shell: "pwsh"
+      - run: "LOCK"
+        shell: "pwsh"
+      - run: "TEST"
         shell: "pwsh"
       - uses: "actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3" #v4.3.1
         with:
-          path: ".lock/*"
+          path: ".lock/${{ matrix.github_actions_runner }}/${{ matrix.python_version }}"
   combine:
     needs: ["lock"]
     runs-on: "ubuntu-22.04"
-    env:
-      COMBINE: true
     steps:
       - uses: "actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11" # v4.1.1
         with:
@@ -55,7 +58,13 @@ jobs:
       - uses: "actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c" # v5.0.0
         with:
           python-version: "3.11"
-      - run: ".tools/sync.ps1"
+      - run: ". .tools/sync.ps1"
+        shell: "pwsh"
+      - run: "SETUP"
+        shell: "pwsh"
+      - run: "CI_ONLY_SETUP"
+        shell: "pwsh"
+      - run: "COMBINE"
         shell: "pwsh"
       - uses: "stefanzweifel/git-auto-commit-action@8756aa072ef5b4a080af5dc8fef36c5d586e521d" # v5.0.0
         with:
diff --git a/.tools/boilercv_tools.py b/.tools/boilercv_tools.py
index ec871dd3..c931c929 100644
--- a/.tools/boilercv_tools.py
+++ b/.tools/boilercv_tools.py
@@ -68,7 +68,7 @@ def sync():
 DEV = Path(".tools/requirements/dev.in")
 NODEPS = Path(".tools/requirements/nodeps.in")
 PLATFORM_LOCKS = Path(".lock")
-ENVIRONMENT = "_".join(["requirements", RUNNER, PYTHON_VERSION.replace(".", "")])
+ENVIRONMENT = "_".join(["requirements", RUNNER, PYTHON_VERSION])
 ENVIRONMENT_LOCK = PLATFORM_LOCKS / ENVIRONMENT
 LOCK = ENVIRONMENT_LOCK / f"{ENVIRONMENT}.txt"
 
diff --git a/.tools/sync.ps1 b/.tools/sync.ps1
index 11b2203f..246e5a7e 100644
--- a/.tools/sync.ps1
+++ b/.tools/sync.ps1
@@ -9,63 +9,41 @@ Param(
 )
 
 $PSNativeCommandUseErrorActionPreference = $true
+$PSNativeCommandUseErrorActionPreference | Out-Null
 
-function Main {
-    function Main {
-        run "pip install uv"
-        inst "-e .tools/."
-        $tools = 'boilercv_tools'
-        $lock = run "$tools get-lockfile"
-        if ($Env:CI) {
-            run "$tools sync"
-            if ($Env:LOCK) {
-                run "$tools lock"
-                sync $lock
-                run "$tools lock --highest"
-            }
-            # ! Invoke-Expression "$Py -m copier update --defaults --vcs-ref $(git rev-parse HEAD:submodules/template)"
-            #! if ($Env:TEST) { Invoke-Expression "$Py -m pytest" }
-            elseif ($Env:COMBINE) {
-                run "$tools combine-locks"
-            }
-            elseif ($Env:TEST) {
-                run "pytest"
-            }
-            return
-        }
-        run "$tools find-lock"
-        sync $lock
+function Start-PythonEnv {
+    <#.SYNOPSIS
+    Activate a Python virtual environment and return its interpreter.
+    #>
+    Param(
+        # Virtual environment name to activate.
+        [Parameter(ValueFromPipeline)][string]$Name = '.venv'
+    )
+    if ($IsWindows) {
+        . "$Name/Scripts/activate"
+        return "$Env:VIRTUAL_ENV/Scripts/python.exe"
     }
-
-    $Py = Get-Python
-
-    function run {
-        Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
-        Invoke-Expression "$Py -m $String"
+    else {
+        . "$Name/bin/activate"
+        return "$Env:VIRTUAL_ENV/bin/python"
     }
-    function inst {
-        Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
-        if ($Env:CI) {
-            run "uv pip install --system --break-system-packages $String"
-        }
-        else {
-            run "uv pip install $String"
+}
+
+function Get-GlobalPython {
+    <#.SYNOPSIS
+    Get the global Python interpreter for a certain Python version.
+    #>
+    if (Get-Command 'py' -ErrorAction Ignore) {
+        if (py --list | Select-String -Pattern "^\s?-V:$([Regex]::Escape($Version))") {
+            return "py -$Version"
         }
     }
-    function sync {
-        Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
-        if ($Env:CI) {
-            run "uv pip sync  --system --break-system-packages $String"
-        }
-        else {
-            run "uv pip sync $String"
-        }
+    elseif (Get-Command "python$Version" -ErrorAction Ignore) {
+        return "python$Version"
     }
-
-    Main
+    Write-Warning "Python $Version does not appear to be installed. Download and install from 'https://www.python.org/downloads/'."
+    return
 }
-
-
 function Get-Python {
     <#.SYNOPSIS
     Get Python environment for this project.
@@ -90,38 +68,68 @@ function Get-Python {
     return $Py
 }
 
-function Get-GlobalPython {
-    <#.SYNOPSIS
-    Get the global Python interpreter for a certain Python version.
-    #>
-    if (Get-Command 'py' -ErrorAction Ignore) {
-        if (py --list | Select-String -Pattern "^\s?-V:$([Regex]::Escape($Version))") {
-            return "py -$Version"
-        }
+$Py = Get-Python
+
+function run {
+    Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
+    Invoke-Expression "$Py -m $String"
+}
+
+function inst {
+    Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
+    if ($Env:CI) {
+        run "uv pip install --system --break-system-packages $String"
     }
-    elseif (Get-Command "python$Version" -ErrorAction Ignore) {
-        return "python$Version"
+    else {
+        run "uv pip install $String"
     }
-    Write-Warning "Python $Version does not appear to be installed. Download and install from 'https://www.python.org/downloads/'."
-    return
 }
 
-function Start-PythonEnv {
-    <#.SYNOPSIS
-    Activate a Python virtual environment and return its interpreter.
-    #>
-    Param(
-        # Virtual environment name to activate.
-        [Parameter(Mandatory, ValueFromPipeline)][string]$Name = '.venv'
-    )
-    if ($IsWindows) {
-        . "$Name/Scripts/activate"
-        return "$Env:VIRTUAL_ENV/Scripts/python.exe"
+function sync {
+    Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
+    if ($Env:CI) {
+        run "uv pip sync  --system --break-system-packages $String"
     }
     else {
-        . "$Name/bin/activate"
-        return "$Env:VIRTUAL_ENV/bin/python"
+        run "uv pip sync $String"
     }
 }
 
-Main
+function tools {
+    Param([Parameter(Mandatory, ValueFromPipeline)][string]$String)
+    run "boilercv_tools $String"
+}
+
+function SETUP {
+    run 'pip install uv'
+    inst '-e .tools/.'
+    run "$tools find-lock"
+    sync $lock
+}
+
+function CI_ONLY_SETUP {
+    run "copier update --defaults --vcs-ref $(git rev-parse HEAD:submodules/template)"
+    run "$tools sync"
+}
+
+function LOCK {
+    $lock = tools 'get-lockfile'
+    run "$tools lock"
+    sync $lock
+    run "$tools lock --highest"
+    elseif ($Env:TEST) {
+        run 'pytest'
+    }
+}
+
+function TEST {
+    run 'pytest'
+}
+
+# * -------------------------------------------------------------------------------- * #
+
+function COMBINE {
+    tools 'combine-locks'
+    run "$tools sync"
+    run "$tools combine-locks"
+}