diff --git a/.gitignore b/.gitignore
index 0d3538e..e5e34d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,6 @@ venv/
 # Real device check logs
 logs/real_device/
 
+# Temporary PR body
+pr_body.md
+
diff --git a/README.md b/README.md
index 5e89409..56b212e 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,16 @@ PR本文テンプレートを表示、またはファイルへ保存します。
 
 これらのスクリプトは実機通信、`real_device_check.py`、`git push`、PR作成、mergeを自動実行しません。
 
+PR作業の開始、公開準備、merge後の同期を補助します。
+
+```powershell
+.\scripts\new_task.ps1 -Branch codex/example-task
+.\scripts\publish_pr.ps1 -Message "Add PR helper scripts" -Title "Add PR helper scripts"
+.\scripts\sync_after_merge.ps1 -Branch codex/example-task
+```
+
+`publish_pr.ps1` は確認後に `git commit` と `git push` を実行します。PR作成とmergeは自動実行しません。
+
 ## mock TCPサーバーの使い方
 
 UTRリーダライタ実機の代わりに、localhost 上で mock TCPサーバーを起動できます。
diff --git a/scripts/new_task.ps1 b/scripts/new_task.ps1
new file mode 100644
index 0000000..2f61be4
--- /dev/null
+++ b/scripts/new_task.ps1
@@ -0,0 +1,61 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$Branch
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+
+function Invoke-Step {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Title,
+
+        [Parameter(Mandatory = $true)]
+        [scriptblock]$Command
+    )
+
+    Write-Host ""
+    Write-Host "== $Title =="
+    $global:LASTEXITCODE = 0
+    & $Command
+    if ($LASTEXITCODE -ne 0) {
+        throw "$Title failed with exit code $LASTEXITCODE"
+    }
+}
+
+Push-Location $repoRoot
+try {
+    $changes = git status --porcelain
+    if ($changes) {
+        Write-Host "ERROR: Uncommitted changes exist. Commit or stash them before creating a new task branch." -ForegroundColor Red
+        git status --short
+        exit 1
+    }
+
+    git show-ref --verify --quiet "refs/heads/$Branch"
+    if ($LASTEXITCODE -eq 0) {
+        Write-Host "ERROR: Branch already exists: $Branch" -ForegroundColor Red
+        exit 1
+    }
+
+    Invoke-Step "checkout main" {
+        git checkout main
+    }
+
+    Invoke-Step "git pull" {
+        git pull
+    }
+
+    Invoke-Step "create branch $Branch" {
+        git checkout -b $Branch
+    }
+
+    Write-Host ""
+    Write-Host "Created and switched to branch: $Branch"
+}
+finally {
+    Pop-Location
+}
diff --git a/scripts/publish_pr.ps1 b/scripts/publish_pr.ps1
new file mode 100644
index 0000000..9313a47
--- /dev/null
+++ b/scripts/publish_pr.ps1
@@ -0,0 +1,162 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$Message,
+
+    [string]$Title,
+
+    [string[]]$Paths
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+if (-not $Title) {
+    $Title = $Message
+}
+
+function Invoke-Step {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$TitleText,
+
+        [Parameter(Mandatory = $true)]
+        [scriptblock]$Command
+    )
+
+    Write-Host ""
+    Write-Host "== $TitleText =="
+    $global:LASTEXITCODE = 0
+    & $Command
+    if ($LASTEXITCODE -ne 0) {
+        throw "$TitleText failed with exit code $LASTEXITCODE"
+    }
+}
+
+function Get-PullRequestUrl {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Branch,
+
+        [Parameter(Mandatory = $true)]
+        [string]$PrTitle
+    )
+
+    $remote = git remote get-url origin
+    if ($LASTEXITCODE -ne 0 -or -not $remote) {
+        return $null
+    }
+
+    $ownerRepo = $null
+    if ($remote -match "github\.com[:/](?<repo>[^/]+/[^/.]+)(\.git)?$") {
+        $ownerRepo = $Matches["repo"]
+    }
+
+    if (-not $ownerRepo) {
+        return $null
+    }
+
+    $encodedBranch = [System.Uri]::EscapeDataString($Branch)
+    $encodedTitle = [System.Uri]::EscapeDataString($PrTitle)
+    return "https://github.com/$ownerRepo/compare/main...$encodedBranch" + "?expand=1&title=$encodedTitle"
+}
+
+Push-Location $repoRoot
+try {
+    $branch = git branch --show-current
+    if ($LASTEXITCODE -ne 0 -or -not $branch) {
+        Write-Host "ERROR: Could not determine current branch." -ForegroundColor Red
+        exit 1
+    }
+
+    if ($branch -eq "main") {
+        Write-Host "ERROR: Refusing to commit directly on main." -ForegroundColor Red
+        exit 1
+    }
+
+    $preflightScript = Join-Path $PSScriptRoot "git_preflight.ps1"
+    Invoke-Step "git_preflight.ps1" {
+        & $preflightScript
+    }
+
+    $status = git status --short
+    Write-Host ""
+    Write-Host "== Pending changes =="
+    if ($status) {
+        $status | ForEach-Object { Write-Host $_ }
+    }
+    else {
+        Write-Host "No pending changes."
+    }
+
+    Write-Host ""
+    Write-Host "== Publish summary =="
+    Write-Host "Branch: $branch"
+    Write-Host "Commit message: $Message"
+    Write-Host "PR title: $Title"
+    if ($Paths) {
+        Write-Host "git add target: specified paths"
+        $Paths | ForEach-Object { Write-Host "  $_" }
+    }
+    else {
+        Write-Host "git add target: all changes (-A)"
+    }
+
+    Write-Host ""
+    $answer = Read-Host "Type YES to run git add, git commit, and git push"
+    if ($answer -ne "YES") {
+        Write-Host "Canceled."
+        exit 1
+    }
+
+    if ($Paths) {
+        Invoke-Step "git add specified paths" {
+            git add -- $Paths
+        }
+    }
+    else {
+        Invoke-Step "git add -A" {
+            git add -A
+        }
+    }
+
+    Invoke-Step "git commit" {
+        git commit -m $Message
+    }
+
+    Invoke-Step "git push" {
+        git push -u origin $branch
+    }
+
+    $bodyPath = Join-Path $repoRoot "pr_body.md"
+    $prBodyScript = Join-Path $PSScriptRoot "pr_body.ps1"
+    Invoke-Step "create pr_body.md" {
+        & $prBodyScript -OutputPath $bodyPath
+    }
+
+    try {
+        if (Get-Command Set-Clipboard -ErrorAction SilentlyContinue) {
+            Get-Content -LiteralPath $bodyPath -Raw | Set-Clipboard
+            Write-Host "Copied pr_body.md to clipboard."
+        }
+    }
+    catch {
+        Write-Host "Could not copy pr_body.md to clipboard: $_" -ForegroundColor Yellow
+    }
+
+    $url = Get-PullRequestUrl -Branch $branch -PrTitle $Title
+    Write-Host ""
+    if ($url) {
+        Write-Host "PR creation URL:"
+        Write-Host $url
+    }
+    else {
+        Write-Host "PR URLを推定できませんでした。GitHub上で手動作成してください" -ForegroundColor Yellow
+    }
+
+    Write-Host ""
+    Write-Host "PR creation and merge were not automated."
+}
+finally {
+    Pop-Location
+}
diff --git a/scripts/sync_after_merge.ps1 b/scripts/sync_after_merge.ps1
new file mode 100644
index 0000000..c982495
--- /dev/null
+++ b/scripts/sync_after_merge.ps1
@@ -0,0 +1,63 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$Branch
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+
+function Invoke-Step {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Title,
+
+        [Parameter(Mandatory = $true)]
+        [scriptblock]$Command
+    )
+
+    Write-Host ""
+    Write-Host "== $Title =="
+    $global:LASTEXITCODE = 0
+    & $Command
+    if ($LASTEXITCODE -ne 0) {
+        throw "$Title failed with exit code $LASTEXITCODE"
+    }
+}
+
+if ($Branch -eq "main") {
+    Write-Host "ERROR: Refusing to delete main." -ForegroundColor Red
+    exit 1
+}
+
+Push-Location $repoRoot
+try {
+    Write-Host "Branch to delete locally: $Branch"
+    Write-Host "This uses git branch -d only. It will not delete the branch on GitHub."
+    $answer = Read-Host "Type YES to checkout main, pull, delete the local branch, and run dev_check"
+    if ($answer -ne "YES") {
+        Write-Host "Canceled."
+        exit 1
+    }
+
+    Invoke-Step "checkout main" {
+        git checkout main
+    }
+
+    Invoke-Step "git pull" {
+        git pull
+    }
+
+    Invoke-Step "delete local branch $Branch" {
+        git branch -d $Branch
+    }
+
+    $devCheckScript = Join-Path $PSScriptRoot "dev_check.ps1"
+    Invoke-Step "dev_check.ps1" {
+        & $devCheckScript
+    }
+}
+finally {
+    Pop-Location
+}