diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1f040a..d5481c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,8 +10,9 @@ CalVer image tags (`stable-YYYY.MM.N`, `dev-YYYY.MM.N`) are produced for every C
 
 ## [Unreleased]
 
-<!-- Add bullets here. Group: Added / Changed / Fixed / Removed / Internal.
-     Mark breaking changes with **BREAKING** at the start of the bullet. -->
+### Added
+
+- **Windows/PowerShell wrapper for local dev.** New `scripts/run-local-dev.ps1` mirrors `scripts/run-local-dev.sh` for operators on Windows where GNU Make / bash aren't available — same compose stack (`docker-compose.yml` + `docker-compose.dev.yml` + `docker-compose.local-dev.yml`), same `LOCAL_DEV_GROUPS` default seeding, same `up` / `down` / `logs` actions. Run `.\scripts\run-local-dev.ps1` for the fast path (reuses existing image) or `.\scripts\run-local-dev.ps1 -Build` to force `--build` after `pyproject.toml` / `Dockerfile` changes. Verified on Docker Desktop for Windows. See `docs/local-development.md`.
 
 ## [0.12.1] — 2026-04-28
 
diff --git a/docs/local-development.md b/docs/local-development.md
index 1c85bc7..ceb07ab 100644
--- a/docs/local-development.md
+++ b/docs/local-development.md
@@ -10,6 +10,15 @@ make local-dev
 
 Then open <http://localhost:8000>. You land on `/dashboard` already logged in as `dev@localhost` (role `admin`) and your `/profile` shows two mocked Workspace groups. No login screen, no `.env` file, no SMTP, no GCP project — just code.
 
+On Windows (or anywhere GNU Make / bash aren't available), `scripts\run-local-dev.ps1` is the feature-equivalent sibling — same compose stack, same `LOCAL_DEV_GROUPS` default. Verified on Docker Desktop for Windows.
+
+```powershell
+.\scripts\run-local-dev.ps1            # up — reuses existing image (auto-builds first run)
+.\scripts\run-local-dev.ps1 -Build     # up --build — after pyproject.toml / Dockerfile changes
+.\scripts\run-local-dev.ps1 down       # stop + remove containers (data volume preserved)
+.\scripts\run-local-dev.ps1 logs       # tail logs
+```
+
 What `make local-dev` actually does:
 
 - Stacks three Compose files: `docker-compose.yml` (base) + `docker-compose.dev.yml` (hot-reload + source bind mount) + `docker-compose.local-dev.yml` (LOCAL_DEV_MODE overlay).
diff --git a/scripts/run-local-dev.ps1 b/scripts/run-local-dev.ps1
new file mode 100644
index 0000000..842f5ae
--- /dev/null
+++ b/scripts/run-local-dev.ps1
@@ -0,0 +1,128 @@
+<#
+.SYNOPSIS
+    Windows/PowerShell sibling of scripts/run-local-dev.sh.
+
+.DESCRIPTION
+    Runs Agnes locally with auth bypass + dev-mode magic links. Stacks three compose files:
+      1. docker-compose.yml          - base services
+      2. docker-compose.dev.yml - hot-reload + source bind mount
+      3. docker-compose.local-dev.yml - LOCAL_DEV_MODE=1, drops .env requirement
+
+    After startup visit http://localhost:8000 - you'll land on /dashboard logged in as
+    dev@localhost (role=admin). No login screen, no email delivery needed.
+
+    Source code is bind-mounted from the host, so Python changes are picked up by
+    uvicorn --reload. Rebuild is only needed when pyproject.toml or Dockerfile change
+    (e.g. after a `git pull` that adds deps). Use -Build for those cases.
+
+.PARAMETER Action
+    up    (default) docker compose up. The image is auto-built on first run.
+    down  docker compose down (stop + remove containers; data volume preserved).
+    logs  docker compose logs -f (tail).
+
+.PARAMETER Build
+    Force --build on `up`. Use after pulling changes that touch pyproject.toml or
+    Dockerfile, or when you hit ModuleNotFoundError from a stale cached image.
+
+.NOTES
+    Anything else on the command line (e.g. -d, --remove-orphans) lands in
+    PowerShell's automatic $args variable and is forwarded to docker compose.
+
+.EXAMPLE
+    .\scripts\run-local-dev.ps1
+    # up - fast path; reuses existing image (auto-builds if none exists yet)
+
+.EXAMPLE
+    .\scripts\run-local-dev.ps1 -Build
+    # up --build - force rebuild after dep / Dockerfile changes
+
+.EXAMPLE
+    .\scripts\run-local-dev.ps1 up -d
+    # detached
+
+.EXAMPLE
+    .\scripts\run-local-dev.ps1 down
+    # stop + remove containers (data volume preserved)
+
+.EXAMPLE
+    .\scripts\run-local-dev.ps1 logs
+    # tail logs from the running stack
+#>
+# Deliberately keep this a SIMPLE (non-advanced) script — no [CmdletBinding()]
+# and no [Parameter(...)] attributes. Both promote the script to an advanced
+# function, which auto-injects the common parameters (-Debug, -Verbose,
+# -ErrorAction, ...) that PowerShell binds via prefix match. Documented
+# examples like `up -d` (detached) and `down -v` (remove volumes) would
+# silently have `-d` / `-v` eaten by `-Debug` / `-Verbose` instead of reaching
+# docker compose. [ValidateSet(...)] and [switch] do NOT promote and stay.
+# Unbound positional args land in PowerShell's automatic $args variable in a
+# non-advanced script; we forward them to docker compose.
+param(
+    [ValidateSet('up', 'down', 'logs')]
+    [string]$Action = 'up',
+
+    [switch]$Build
+)
+
+$ErrorActionPreference = 'Stop'
+
+# PowerShell scripts execute in the caller's runspace (unlike bash, which forks
+# a child process), so Set-Location and $env:* assignments leak back into the
+# user's shell after the script exits. Wrap the body in Push-Location /
+# Pop-Location with try/finally and snapshot the LOCAL_DEV_GROUPS env-var so
+# the operator's session is restored on any exit path (success, error, Ctrl+C
+# during `up`/`logs`).
+Push-Location (Split-Path -Parent $PSScriptRoot)
+$localDevGroupsWasSet = Test-Path Env:LOCAL_DEV_GROUPS
+$localDevGroupsOriginal = if ($localDevGroupsWasSet) { $env:LOCAL_DEV_GROUPS } else { $null }
+try {
+    # docker-compose.yml declares env_file: .env on several services. Compose
+    # validates that path even for profiled services that never start, so make
+    # sure it exists.
+    if (-not (Test-Path .env)) {
+        New-Item -ItemType File -Path .env -Force | Out-Null
+    }
+
+    # Default LOCAL_DEV_GROUPS so /profile and group-aware code see *something* on
+    # first boot. Mirrors scripts/run-local-dev.sh. Override/disable:
+    #   $env:LOCAL_DEV_GROUPS = '[...]'; .\scripts\run-local-dev.ps1
+    #   $env:LOCAL_DEV_GROUPS = '';      .\scripts\run-local-dev.ps1   # exercise no-groups path
+    # Test-Path on Env: distinguishes unset (apply default) from set-to-empty
+    # (honor operator intent) — same contract as the bash sibling.
+    if (-not $localDevGroupsWasSet) {
+        $env:LOCAL_DEV_GROUPS = '[{"id":"local-dev-engineers@example.com","name":"Local Dev Engineers"},{"id":"local-dev-admins@example.com","name":"Local Dev Admins"}]'
+    }
+
+    $composeFiles = @(
+        '-f', 'docker-compose.yml',
+        '-f', 'docker-compose.dev.yml',
+        '-f', 'docker-compose.local-dev.yml'
+    )
+
+    switch ($Action) {
+        'up' {
+            $cmd = @('up')
+            if ($Build) { $cmd += '--build' }
+        }
+        'down' {
+            $cmd = @('down')
+        }
+        'logs' {
+            $cmd = @('logs', '-f')
+        }
+    }
+
+    if ($args) { $cmd += $args }
+
+    Write-Host "> docker compose $($composeFiles + $cmd -join ' ')" -ForegroundColor Cyan
+    & docker compose @composeFiles @cmd
+} finally {
+    Pop-Location
+    if ($localDevGroupsWasSet) {
+        $env:LOCAL_DEV_GROUPS = $localDevGroupsOriginal
+    } else {
+        Remove-Item Env:LOCAL_DEV_GROUPS -ErrorAction SilentlyContinue
+    }
+}
+
+exit $LASTEXITCODE