diff --git a/.claude/CLAUDE.md b/.claude/CLAUDE.md
index a38ba5b6..b1a3f3f0 100644
--- a/.claude/CLAUDE.md
+++ b/.claude/CLAUDE.md
@@ -26,6 +26,7 @@ Makefile は `nix develop --command bash -c "..."` でラップ済み。AI は
 | マイグレーション | `make migrate` / `make migrate-create MSG="..."` |
 | インフラ validate | `make infra-validate` |
 | コード重複検知 | `make dupe-check` （結果: `report/dupe/jscpd-report.json`） |
+| ミューテーションテスト | `make mutation-backend` / `make mutation-web` （**長時間**。通常 CI には含まれない週次実行。詳細: 下記「ミューテーションテスト・Slack 通知」） |
 
 セットアップ詳細・各コマンドの目的は `docs/development.md` を参照。
 
@@ -102,6 +103,24 @@ nix develop --command bash -c "cd web && npm run test:e2e"
 
 CI 定義: `.github/workflows/ci.yml`
 
+## ミューテーションテスト・Slack 通知（ADR-0017）
+
+テストの検出力（弱い assertion / 実装なぞり）を週次のミューテーションテストで可視化し、CI 結果は用途別 Slack チャンネルへ通知する。詳細（ローカル実行・レポート確認・Secrets 登録手順）は `docs/development.md`「ミューテーションテスト」「Slack 通知」節が正本。
+
+- **ローカル実行**: `make mutation-backend`（mutmut）/ `make mutation-web`（Stryker）。**フル実行は長時間**のため、対象を絞る場合は `nix develop --command bash -c "cd backend && .venv/bin/python -m mutmut run 'app.services.shared.sort_utils*'"` / `nix develop --command bash -c "cd web && npx stryker run --mutate 'src/utils/text.ts'"`
+- **対象スコープの正本**: backend = `backend/pyproject.toml` の `[tool.mutmut]`、web = `web/stryker.conf.json`。決定論的ビジネスロジックに限定（schemas / models / routers / 自動生成コード等は対象外）
+- **CI**: `.github/workflows/mutation.yml`（週次 月曜 3:00 JST + workflow_dispatch。**PR/push では動かない・fail しない warn-only**）
+- **pytest の `--cov` は addopts に戻さない**: mutmut 干渉回避のため Makefile / test.yml の呼び出し側で付与している（ADR-0017）
+
+| Slack Secret | 用途 | 送信元 workflow |
+|---|---|---|
+| `SLACK_WEBHOOK_URL_CI` | 通常 CI の失敗のみ | `notify.yml`（workflow_run） |
+| `SLACK_WEBHOOK_URL_DEPLOY` | Cloud Run / Cloudflare Pages デプロイ結果（成功・失敗とも） | `notify.yml`（workflow_run） |
+| `SLACK_WEBHOOK_URL_QUALITY` | ミューテーションテスト結果（score が閾値未満で ⚠️ 強調） | `mutation.yml` |
+| `SLACK_WEBHOOK_URL_DEPS` | Renovate / Dependabot の PR 起票 | `deps-notify.yml`（pull_request_target） |
+
+Secrets は未登録の間は通知が静かに skip される（CI は green のまま）。チャンネル作成後の登録は `gh secret set SLACK_WEBHOOK_URL_CI --body "https://hooks.slack.com/services/..."`（4 つとも。手順詳細: `docs/development.md`）。
+
 ## 作業開始時のブランチ運用（デフォルト）
 
 **新しい作業に着手するときは、最初に main から作業ブランチを切る。** これはデフォルト挙動であり、合言葉や明示指示を待たない。
diff --git a/.github/workflows/deps-notify.yml b/.github/workflows/deps-notify.yml
new file mode 100644
index 00000000..3cb55e97
--- /dev/null
+++ b/.github/workflows/deps-notify.yml
@@ -0,0 +1,70 @@
+# Renovate / Dependabot が依存更新 PR を起票したら SLACK_WEBHOOK_URL_DEPS へ通知する（ADR-0017）。
+#
+# pull_request_target を使う理由: Dependabot が actor の pull_request イベントは
+# Actions secrets ではなく Dependabot secrets しか参照できず Webhook が空になる。
+# pull_request_target は base ブランチのコンテキストで実行され通常の secrets を参照できる。
+# PR のコードは一切 checkout / 実行せず（イベントペイロードの文字列のみ扱う）、
+# actor をボットに限定しているため pull_request_target でも安全。
+# PR タイトル等の外部入力は run 内に直接式展開せず env 経由で渡す（インジェクション対策）。
+name: Deps Notify
+
+on:
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  contents: read
+
+jobs:
+  notify-deps:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    # github.actor は「最後にイベントを起こした actor」でスプーフ可能なため、
+    # PR 作成者（pull_request.user.login）で判定する（zizmor bot-conditions）
+    if: github.event.pull_request.user.login == 'renovate[bot]' || github.event.pull_request.user.login == 'dependabot[bot]'
+    env:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_DEPS }}
+
+    steps:
+      - name: 通知メッセージを組み立て
+        id: compose
+        if: env.SLACK_WEBHOOK_URL != ''
+        env:
+          WF_NAME: ${{ github.workflow }}
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          PR_BRANCH: ${{ github.event.pull_request.head.ref }}
+          PR_ACTOR: ${{ github.event.pull_request.user.login }}
+        run: |
+          summary="📦 依存更新 PR: #${PR_NUMBER} ${PR_TITLE}"
+          body=$(printf '%s\n' \
+            "📦 *${WF_NAME}*: ${PR_ACTOR} が依存更新 PR を起票しました" \
+            "> #${PR_NUMBER} ${PR_TITLE} (branch: \`${PR_BRANCH}\`)" \
+            "<${PR_URL}|→ PR を開く>")
+          # untrusted 値（PR タイトル）が GITHUB_OUTPUT のデリミタ行と衝突しないよう run 毎にランダム生成する
+          delim="GHOUT_$(openssl rand -hex 8)"
+          {
+            echo "summary<<$delim"; echo "$summary"; echo "$delim"
+            echo "body<<$delim";    echo "$body";    echo "$delim"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Slack 通知 (依存更新 PR)
+        if: env.SLACK_WEBHOOK_URL != ''
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.0
+        with:
+          webhook: ${{ env.SLACK_WEBHOOK_URL }}
+          webhook-type: incoming-webhook
+          payload: |
+            {
+              "text": ${{ toJSON(steps.compose.outputs.summary) }},
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": ${{ toJSON(steps.compose.outputs.body) }}
+                  }
+                }
+              ]
+            }
diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
new file mode 100644
index 00000000..f2d2925f
--- /dev/null
+++ b/.github/workflows/mutation.yml
@@ -0,0 +1,273 @@
+# 週次ミューテーションテスト（ADR-0017）。
+# テストスイートの検出力（弱い assertion / 実装なぞりテスト）を可視化する。
+# フル実行が長時間かかるため通常 CI（ci.yml）には組み込まず、週次 schedule と
+# 手動実行（workflow_dispatch）のみとする。結果は warn-only（fail させない）で、
+# SLACK_WEBHOOK_URL_QUALITY へ killed / survived / score を通知する。
+name: Mutation
+
+on:
+  schedule:
+    # 毎週月曜 3:00 JST（= 日曜 18:00 UTC）
+    - cron: "0 18 * * 0"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  # mutation score（%）がこの値未満のとき Slack 通知を ⚠️ で強調する
+  MUTATION_SCORE_THRESHOLD: "80"
+
+concurrency:
+  group: mutation-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  # Backend: mutmut（対象: backend/pyproject.toml の [tool.mutmut] を参照）
+  mutation-backend:
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    outputs:
+      killed: ${{ steps.stats.outputs.killed }}
+      survived: ${{ steps.stats.outputs.survived }}
+      score: ${{ steps.stats.outputs.score }}
+      stats_ok: ${{ steps.stats.outputs.stats_ok }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          # 読み取り専用ジョブのため checkout の認証情報をディスクに残さない（サプライチェーン保護）。
+          persist-credentials: false
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
+        with:
+          version: "latest"
+          enable-cache: true
+          cache-dependency-glob: "backend/requirements.txt"
+
+      - name: Setup Python
+        run: uv python install 3.13
+
+      - name: WeasyPrint 用システムライブラリのインストール
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libpango-1.0-0 libpangoft2-1.0-0 libpangocairo-1.0-0 \
+            libglib2.0-0 libgobject-2.0-0 libffi-dev libcairo2
+
+      - name: Install backend dependencies
+        working-directory: backend
+        run: uv pip install -r requirements.txt
+
+      # 生存ミュータントがあっても集計と通知は行うため continue-on-error にする
+      - name: Run mutmut
+        id: run
+        working-directory: backend
+        continue-on-error: true
+        run: uv run mutmut run 2>&1 | tee mutmut-run.log
+
+      # 生存ミュータントの一覧（調査用）。run が途中で落ちても best-effort で出力する
+      - name: 生存ミュータント一覧を出力
+        working-directory: backend
+        continue-on-error: true
+        run: uv run mutmut results > mutmut-results.txt
+
+      - name: 結果集計
+        id: stats
+        working-directory: backend
+        run: |
+          # export-cicd-stats が mutants/mutmut-cicd-stats.json に統計を書き出す。
+          # score の定義（ADR-0017 / Stryker と同基準）:
+          #   killed   = killed + timeout（無限ループ化もテストによる検出とみなす）
+          #   survived = survived + no_tests（どのテストにも触れられない = 検出不能）
+          #   score    = killed * 100 / (killed + survived + suspicious + segfault)
+          uv run mutmut export-cicd-stats || true
+          STATS=mutants/mutmut-cicd-stats.json
+          if [ -f "$STATS" ]; then
+            killed=$(jq '.killed + .timeout' "$STATS")
+            survived=$(jq '.survived + .no_tests' "$STATS")
+            denom=$(jq '.killed + .timeout + .survived + .no_tests + .suspicious + .segfault' "$STATS")
+            if [ "$denom" -gt 0 ]; then
+              score=$(( killed * 100 / denom ))
+            else
+              score=0
+            fi
+            {
+              echo "killed=$killed"
+              echo "survived=$survived"
+              echo "score=$score"
+              echo "stats_ok=true"
+            } >> "$GITHUB_OUTPUT"
+          else
+            echo "::warning::mutmut の統計ファイルが見つかりません（run が途中で失敗した可能性）"
+            {
+              echo "killed=0"
+              echo "survived=0"
+              echo "score=0"
+              echo "stats_ok=false"
+            } >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: レポートを artifact 化
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
+        with:
+          name: mutmut-report
+          path: |
+            backend/mutmut-run.log
+            backend/mutmut-results.txt
+            backend/mutants/mutmut-cicd-stats.json
+          if-no-files-found: warn
+          retention-days: 14
+
+  # Frontend: Stryker（対象: web/stryker.conf.json を参照）
+  mutation-web:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    outputs:
+      killed: ${{ steps.stats.outputs.killed }}
+      survived: ${{ steps.stats.outputs.survived }}
+      score: ${{ steps.stats.outputs.score }}
+      stats_ok: ${{ steps.stats.outputs.stats_ok }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        with:
+          persist-credentials: false
+
+      - name: Setup Node
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        with:
+          node-version: "20"
+          cache: npm
+          cache-dependency-path: web/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci --prefix web
+
+      # 生存ミュータントがあっても集計と通知は行うため continue-on-error にする
+      - name: Run Stryker
+        id: run
+        continue-on-error: true
+        run: npm run test:mutation --prefix web
+
+      - name: 結果集計
+        id: stats
+        run: |
+          # score の定義（ADR-0017 / mutmut 側と同基準）:
+          #   killed   = Killed + Timeout
+          #   survived = Survived + NoCoverage
+          #   score    = killed * 100 / (killed + survived)
+          REPORT=web/reports/mutation/mutation.json
+          if [ -f "$REPORT" ]; then
+            killed=$(jq '[.files[].mutants[].status | select(. == "Killed" or . == "Timeout")] | length' "$REPORT")
+            survived=$(jq '[.files[].mutants[].status | select(. == "Survived" or . == "NoCoverage")] | length' "$REPORT")
+            if [ $(( killed + survived )) -gt 0 ]; then
+              score=$(( killed * 100 / (killed + survived) ))
+            else
+              score=0
+            fi
+            {
+              echo "killed=$killed"
+              echo "survived=$survived"
+              echo "score=$score"
+              echo "stats_ok=true"
+            } >> "$GITHUB_OUTPUT"
+          else
+            echo "::warning::Stryker のレポートが見つかりません（run が途中で失敗した可能性）"
+            {
+              echo "killed=0"
+              echo "survived=0"
+              echo "score=0"
+              echo "stats_ok=false"
+            } >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: レポートを artifact 化
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
+        with:
+          name: stryker-report
+          path: web/reports/mutation/
+          if-no-files-found: warn
+          retention-days: 14
+
+  # 結果を SLACK_WEBHOOK_URL_QUALITY へ 1 メッセージで通知する。
+  # secrets はジョブ/ステップの if で直接参照できないため、env 経由で空判定する
+  # （Secret 未登録の間は静かに skip され、workflow は green のまま）。
+  notify-quality:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    needs: [mutation-backend, mutation-web]
+    if: always()
+    env:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_QUALITY }}
+
+    steps:
+      - name: 通知メッセージを組み立て
+        id: compose
+        if: env.SLACK_WEBHOOK_URL != ''
+        env:
+          BE_RESULT: ${{ needs.mutation-backend.result }}
+          BE_STATS_OK: ${{ needs.mutation-backend.outputs.stats_ok }}
+          BE_KILLED: ${{ needs.mutation-backend.outputs.killed }}
+          BE_SURVIVED: ${{ needs.mutation-backend.outputs.survived }}
+          BE_SCORE: ${{ needs.mutation-backend.outputs.score }}
+          WEB_RESULT: ${{ needs.mutation-web.result }}
+          WEB_STATS_OK: ${{ needs.mutation-web.outputs.stats_ok }}
+          WEB_KILLED: ${{ needs.mutation-web.outputs.killed }}
+          WEB_SURVIVED: ${{ needs.mutation-web.outputs.survived }}
+          WEB_SCORE: ${{ needs.mutation-web.outputs.score }}
+          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+          WORKFLOW: ${{ github.workflow }}
+          BRANCH: ${{ github.ref_name }}
+        run: |
+          threshold="$MUTATION_SCORE_THRESHOLD"
+          # 全体ステータス: ジョブ失敗/統計欠落 → ❌、いずれかの score が閾値未満 → ⚠️、それ以外 → ✅
+          if [ "$BE_RESULT" != "success" ] || [ "$WEB_RESULT" != "success" ] || \
+             [ "$BE_STATS_OK" != "true" ] || [ "$WEB_STATS_OK" != "true" ]; then
+            emoji="❌"
+            headline="Mutation testing がエラーで完走しませんでした"
+          elif [ "$BE_SCORE" -lt "$threshold" ] || [ "$WEB_SCORE" -lt "$threshold" ]; then
+            emoji="⚠️"
+            headline="*mutation score が閾値（${threshold}%）を下回っています*"
+          else
+            emoji="✅"
+            headline="mutation score は閾値（${threshold}%）以上です"
+          fi
+          body=$(printf '%s\n' \
+            "${emoji} *${WORKFLOW}* (branch: \`${BRANCH}\`)" \
+            "${headline}" \
+            "• *Backend (mutmut)* — killed: ${BE_KILLED} / survived: ${BE_SURVIVED} / score: *${BE_SCORE}%*" \
+            "• *Web (Stryker)* — killed: ${WEB_KILLED} / survived: ${WEB_SURVIVED} / score: *${WEB_SCORE}%*" \
+            "<${RUN_URL}|→ 実行結果とレポート artifact を開く>")
+          summary="${emoji} Mutation weekly report (${BRANCH})"
+          # GITHUB_OUTPUT のデリミタ行と本文が衝突しないよう run 毎にランダム生成する（他通知 workflow と統一）
+          delim="GHOUT_$(openssl rand -hex 8)"
+          {
+            echo "summary<<$delim"; echo "$summary"; echo "$delim"
+            echo "body<<$delim";    echo "$body";    echo "$delim"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Slack 通知 (QUALITY)
+        if: env.SLACK_WEBHOOK_URL != ''
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.0
+        with:
+          webhook: ${{ env.SLACK_WEBHOOK_URL }}
+          webhook-type: incoming-webhook
+          payload: |
+            {
+              "text": ${{ toJSON(steps.compose.outputs.summary) }},
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": ${{ toJSON(steps.compose.outputs.body) }}
+                  }
+                }
+              ]
+            }
diff --git a/.github/workflows/notify.yml b/.github/workflows/notify.yml
new file mode 100644
index 00000000..fdc0381c
--- /dev/null
+++ b/.github/workflows/notify.yml
@@ -0,0 +1,182 @@
+# CI ワークフローの完了を workflow_run で受けて Slack 通知する（ADR-0017）。
+# - notify-ci:     CI 失敗時のみ SLACK_WEBHOOK_URL_CI へ通知（cancelled は
+#                  concurrency の cancel-in-progress によるノイズのため通知しない）
+# - notify-deploy: main/stg/dev への push で deploy ジョブが実行された場合に
+#                  SLACK_WEBHOOK_URL_DEPLOY へ環境別の成功/失敗を通知（成功も通知する）
+# workflow_run の payload にはジョブ単位の結果が含まれないため、jobs API
+# （permissions: actions: read + runner 標準搭載の gh CLI）で補完する。
+# secrets はジョブ/ステップの if で直接参照できないため、env 経由で空判定する
+# （Secret 未登録の間は静かに skip され、workflow は green のまま）。
+name: Notify
+
+on:
+  workflow_run:
+    workflows: ["CI"]
+    types: [completed]
+
+permissions:
+  contents: read
+  actions: read
+
+jobs:
+  notify-ci:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    # timeout-minutes 到達時の conclusion は failure ではなく timed_out になるため両方拾う
+    if: contains(fromJSON('["failure", "timed_out"]'), github.event.workflow_run.conclusion)
+    env:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_CI }}
+
+    steps:
+      - name: 失敗ジョブ名を収集
+        id: failed
+        if: env.SLACK_WEBHOOK_URL != ''
+        env:
+          GH_TOKEN: ${{ github.token }}
+          RUN_ID: ${{ github.event.workflow_run.id }}
+          REPO: ${{ github.repository }}
+        run: |
+          # gh api の失敗（rate limit / 一時障害）で通知が黙って欠落しないよう明示チェックする
+          if ! names=$(gh api "repos/${REPO}/actions/runs/${RUN_ID}/jobs?per_page=100" --paginate \
+            --jq '[.jobs[] | select(.conclusion == "failure") | .name] | join(", ")'); then
+            echo "::warning::jobs API の取得に失敗しました（失敗ジョブ名なしで通知します）"
+            names="⚠️ 失敗ジョブ名の取得に失敗しました"
+          fi
+          echo "names=${names:-（ジョブ単位の失敗なし）}" >> "$GITHUB_OUTPUT"
+
+      - name: 通知メッセージを組み立て
+        id: compose
+        if: env.SLACK_WEBHOOK_URL != ''
+        env:
+          # PR タイトル等の外部入力を含みうる値は run 内に直接式展開せず env 経由で渡す（インジェクション対策）
+          WF_NAME: ${{ github.event.workflow_run.name }}
+          TITLE: ${{ github.event.workflow_run.display_title }}
+          BRANCH: ${{ github.event.workflow_run.head_branch }}
+          EVENT: ${{ github.event.workflow_run.event }}
+          RUN_URL: ${{ github.event.workflow_run.html_url }}
+          FAILED_JOBS: ${{ steps.failed.outputs.names }}
+        run: |
+          summary="❌ ${WF_NAME} failed (${BRANCH})"
+          body=$(printf '%s\n' \
+            "❌ *${WF_NAME}* failed (branch: \`${BRANCH}\` / event: ${EVENT})" \
+            "> ${TITLE}" \
+            "失敗ジョブ: ${FAILED_JOBS}" \
+            "<${RUN_URL}|→ 失敗した Run を開く>")
+          # untrusted 値（display_title 等）が GITHUB_OUTPUT のデリミタ行と衝突しないよう run 毎にランダム生成する
+          delim="GHOUT_$(openssl rand -hex 8)"
+          {
+            echo "summary<<$delim"; echo "$summary"; echo "$delim"
+            echo "body<<$delim";    echo "$body";    echo "$delim"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Slack 通知 (CI 失敗)
+        if: env.SLACK_WEBHOOK_URL != ''
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.0
+        with:
+          webhook: ${{ env.SLACK_WEBHOOK_URL }}
+          webhook-type: incoming-webhook
+          payload: |
+            {
+              "text": ${{ toJSON(steps.compose.outputs.summary) }},
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": ${{ toJSON(steps.compose.outputs.body) }}
+                  }
+                }
+              ]
+            }
+
+  notify-deploy:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    # deploy ジョブ（ci.yml の deploy-dev / deploy-stg / deploy-prod）は
+    # main/stg/dev への push でのみ実行される。PR の run はここで除外する
+    if: >
+      github.event.workflow_run.event == 'push' &&
+      contains(fromJSON('["main", "stg", "dev"]'), github.event.workflow_run.head_branch)
+    env:
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_DEPLOY }}
+
+    steps:
+      - name: デプロイジョブの結果を収集
+        id: deploys
+        if: env.SLACK_WEBHOOK_URL != ''
+        env:
+          GH_TOKEN: ${{ github.token }}
+          RUN_ID: ${{ github.event.workflow_run.id }}
+          REPO: ${{ github.repository }}
+        run: |
+          # 再利用ワークフロー（deploy.yml）内のジョブは "deploy-dev / deploy-web" の
+          # 形式で列挙される。"tests / deploy-gate" は startswith にマッチしない。
+          # skipped（deploy_gate 不通過・変更なし等）は通知対象にしない。
+          # gh api の失敗でデプロイ結果通知が黙ってスキップ（count=0）されないよう明示チェックする
+          if ! lines=$(gh api "repos/${REPO}/actions/runs/${RUN_ID}/jobs?per_page=100" --paginate \
+            --jq '[.jobs[] | select(.name | startswith("deploy-"))
+                          | select(.conclusion == "success" or .conclusion == "failure")
+                          | "\(if .conclusion == "success" then "✅" else "❌" end) \(.name)"] | join("\n")'); then
+            echo "::warning::jobs API の取得に失敗しました（デプロイ結果を取得できず通知します）"
+            lines="⚠️ deploy ジョブ結果の取得に失敗しました"
+          fi
+          count=$(printf '%s' "$lines" | grep -c . || true)
+          # ジョブ名等が GITHUB_OUTPUT のデリミタ行と衝突しないよう run 毎にランダム生成する（他の出力と統一）
+          delim="GHOUT_$(openssl rand -hex 8)"
+          {
+            echo "count=$count"
+            echo "lines<<$delim"
+            echo "$lines"
+            echo "$delim"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: 通知メッセージを組み立て
+        id: compose
+        if: env.SLACK_WEBHOOK_URL != '' && steps.deploys.outputs.count != '0'
+        env:
+          WF_NAME: ${{ github.event.workflow_run.name }}
+          TITLE: ${{ github.event.workflow_run.display_title }}
+          BRANCH: ${{ github.event.workflow_run.head_branch }}
+          RUN_URL: ${{ github.event.workflow_run.html_url }}
+          DEPLOY_LINES: ${{ steps.deploys.outputs.lines }}
+        run: |
+          if printf '%s' "$DEPLOY_LINES" | grep -q '❌'; then
+            emoji="❌"
+          elif printf '%s' "$DEPLOY_LINES" | grep -q '⚠️'; then
+            emoji="⚠️"
+          else
+            emoji="✅"
+          fi
+          summary="${emoji} Deploy (${BRANCH})"
+          body=$(printf '%s\n' \
+            "${emoji} *${WF_NAME}* deploy result (branch: \`${BRANCH}\`)" \
+            "> ${TITLE}" \
+            "$DEPLOY_LINES" \
+            "<${RUN_URL}|→ Run を開く>")
+          # untrusted 値（display_title 等）が GITHUB_OUTPUT のデリミタ行と衝突しないよう run 毎にランダム生成する
+          delim="GHOUT_$(openssl rand -hex 8)"
+          {
+            echo "summary<<$delim"; echo "$summary"; echo "$delim"
+            echo "body<<$delim";    echo "$body";    echo "$delim"
+          } >> "$GITHUB_OUTPUT"
+
+      # count=0（deploy ジョブが 1 つも実行されなかった run）は通知しない
+      - name: Slack 通知 (デプロイ結果)
+        if: env.SLACK_WEBHOOK_URL != '' && steps.deploys.outputs.count != '0'
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.0
+        with:
+          webhook: ${{ env.SLACK_WEBHOOK_URL }}
+          webhook-type: incoming-webhook
+          payload: |
+            {
+              "text": ${{ toJSON(steps.compose.outputs.summary) }},
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": ${{ toJSON(steps.compose.outputs.body) }}
+                  }
+                }
+              ]
+            }
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 98b59e41..3efd7161 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -202,7 +202,8 @@ jobs:
 
       - name: Run backend tests
         working-directory: backend
-        run: uv run pytest -q tests
+        # --cov は pyproject の addopts ではなくここで付与する（mutmut 干渉回避 / ADR-0017）
+        run: uv run pytest -q --cov=app --cov-report=term-missing tests
 
   # OpenAPI → TypeScript 型のドリフト検知 (ADR-0007)。
   # backend schema を変更したのに web/src/api/generated.ts を再生成して
diff --git a/.gitignore b/.gitignore
index b5547dd8..50325bc1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,6 +53,11 @@ backend/.env
 # AI レビュー出力（BE_refacter / WEB_refacter skill が書き出す）
 report/
 
+# Mutation testing の生成物（ADR-0017）
+backend/mutants/
+web/reports/
+web/.stryker-tmp/
+
 # OS
 .DS_Store
 .direnv/
diff --git a/Makefile b/Makefile
index 013f8f2a..0e845fb8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 .PHONY: help \
 	setup install-hooks install-backend install-web generate-keys \
 	dev dev-build dev-down dev-amd64 dev-amd64-build dev-web preview-web dev-proxy dev-proxy-only stripe-webhook \
-	test test-backend test-web \
+	test test-backend test-web mutation-backend mutation-web \
 	lint lint-backend typecheck-backend lint-web lint-web-messages lint-env-keys lint-fix \
 	format format-check \
 	ci \
@@ -38,6 +38,8 @@ help:
 	@echo "  test              全テスト (backend + web)"
 	@echo "  test-backend      Backend: pytest"
 	@echo "  test-web     Frontend: vitest"
+	@echo "  mutation-backend  Backend: mutmut (長時間。結果閲覧: cd backend && .venv/bin/python -m mutmut browse)"
+	@echo "  mutation-web      Frontend: Stryker (長時間。レポート: web/reports/mutation/)"
 	@echo "  lint              全リント (backend + web)"
 	@echo "  lint-backend      Backend: ruff check"
 	@echo "  typecheck-backend Backend: pyright 型チェック"
@@ -136,12 +138,22 @@ ci: lint test build-web
 
 test: test-backend test-web
 
+# --cov は pyproject の addopts ではなくここで付与する（mutmut 干渉回避 / ADR-0017）
 test-backend:
-	nix develop --command bash -c "cd backend && .venv/bin/python -m pytest -q tests"
+	nix develop --command bash -c "cd backend && .venv/bin/python -m pytest -q --cov=app --cov-report=term-missing tests"
 
 test-web:
 	nix develop --command bash -c "cd web && npm test"
 
+# ミューテーションテスト（ADR-0017）。フル実行は長時間かかるため通常 CI には含めず、
+# 週次の .github/workflows/mutation.yml で実行する。対象は pyproject [tool.mutmut] /
+# web/stryker.conf.json を参照。
+mutation-backend:
+	nix develop --command bash -c "cd backend && .venv/bin/python -m mutmut run"
+
+mutation-web:
+	nix develop --command bash -c "cd web && npm run test:mutation"
+
 lint: lint-backend typecheck-backend lint-web lint-web-messages lint-env-keys
 
 lint-backend:
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index d6d3bcff..4a1f9fc4 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -1,8 +1,29 @@
 [tool.pytest.ini_options]
 pythonpath = ["."]
-addopts = "--cov=app --cov-report=term-missing -p no:cacheprovider"
+# --cov は Makefile / CI 側の pytest 呼び出しで付与する。addopts に置くと mutmut が
+# mutants/ 内で pytest を内部実行する際にも全ミュータントへ coverage 計測が載り干渉するため（ADR-0017）
+addopts = "-p no:cacheprovider"
 testpaths = ["tests"]
 
+# ミューテーションテスト（週次 CI: .github/workflows/mutation.yml / ADR-0017）
+# 対象は高価値な決定論的ビジネスロジックに限定する。source_paths の app 全体は
+# mutants/ へコピーされる（import・JSON リソース解決のため）が、変異を加えるのは
+# only_mutate のグロブ（fnmatch。"*" は "/" にもマッチ）に一致するファイルのみ。
+# schemas / models / routers / alembic_migrations / prompts / LLM クライアント等の
+# I/O 層・宣言層は対象外（テストで殺せないミュータントがノイズになるため）
+[tool.mutmut]
+source_paths = ["app"]
+only_mutate = [
+    "app/services/blog/scorer.py",                        # ブログ技術記事スコアリング
+    "app/services/billing/pricing.py",                    # 課金レート表
+    "app/services/billing/credit_service.py",             # クレジット計算・残高
+    "app/services/intelligence/skills/*",                 # スキル推論（aggregator/linguist/パーサ群）
+    "app/services/intelligence/github/repo_analyzer.py",  # リポジトリ解析
+    "app/services/intelligence/github/contributions.py",  # コントリビューション集計
+    "app/services/shared/*",                              # sort_utils / resume_format
+    "app/services/tasks/worker.py",                       # タスク状態遷移
+]
+
 [tool.ruff]
 line-length = 100
 target-version = "py313"
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 7608a012..cb17f2cc 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -39,3 +39,5 @@ google-cloud-tasks==2.23.0
 pyasn1==0.6.3
 # CVE-2026-53538 / CVE-2026-53539 / CVE-2026-53540 対策で 0.0.31 へ更新
 python-multipart==0.0.32
+# ミューテーションテスト（週次 CI: .github/workflows/mutation.yml / ADR-0017）
+mutmut==3.6.0
diff --git a/backend/tests/test_error_code_sync.py b/backend/tests/test_error_code_sync.py
index f49cb584..2cac1dad 100644
--- a/backend/tests/test_error_code_sync.py
+++ b/backend/tests/test_error_code_sync.py
@@ -12,9 +12,25 @@
 
 from app.core.errors import ErrorCode
 
-# backend/tests/ から見たリポジトリルート（monorepo 前提で frontend が隣接する）
-_REPO_ROOT = Path(__file__).resolve().parents[2]
-_ERROR_CODES_TS = _REPO_ROOT / "web" / "src" / "constants" / "errorCodes.ts"
+# errorCodes.ts のリポジトリルートからの相対パス（monorepo 前提で frontend が隣接する）
+_ERROR_CODES_TS_RELATIVE = Path("web") / "src" / "constants" / "errorCodes.ts"
+
+
+def _locate_error_codes_ts() -> Path:
+    """祖先ディレクトリを遡って FE の ``errorCodes.ts`` を探す。
+
+    mutmut がテストを ``backend/mutants/tests/`` へコピーして実行する際は
+    本ファイルの深さが 1 段増えるため、固定段数の ``parents[N]`` では
+    リポジトリルートを特定できない（ADR-0017）。
+    """
+    here = Path(__file__).resolve()
+    for candidate in here.parents:
+        target = candidate / _ERROR_CODES_TS_RELATIVE
+        if target.exists():
+            return target
+    raise FileNotFoundError(
+        f"FE のエラーコード定義が祖先ディレクトリに見つからない: {_ERROR_CODES_TS_RELATIVE}"
+    )
 
 # `export const ERROR_CODES = [ ... ] as const;` のブロックを取り出す
 _ARRAY_BLOCK = re.compile(r"ERROR_CODES\s*=\s*\[(.*?)\]\s*as\s+const", re.DOTALL)
@@ -24,10 +40,7 @@
 
 def _parse_frontend_error_codes() -> set[str]:
     """FE の ``errorCodes.ts`` から ``ERROR_CODES`` の値集合を抽出する。"""
-    assert _ERROR_CODES_TS.exists(), (
-        f"FE のエラーコード定義が見つからない: {_ERROR_CODES_TS}"
-    )
-    source = _ERROR_CODES_TS.read_text(encoding="utf-8")
+    source = _locate_error_codes_ts().read_text(encoding="utf-8")
     match = _ARRAY_BLOCK.search(source)
     assert match is not None, (
         "errorCodes.ts に `ERROR_CODES = [...] as const` ブロックが見つからない"
diff --git a/docs/adr/0017-mutation-testing-and-slack-notifications.md b/docs/adr/0017-mutation-testing-and-slack-notifications.md
new file mode 100644
index 00000000..72b38aff
--- /dev/null
+++ b/docs/adr/0017-mutation-testing-and-slack-notifications.md
@@ -0,0 +1,98 @@
+# ADR-0017: ミューテーションテスト週次実行と Slack 通知チャンネル分割
+
+## ステータス
+
+Accepted
+
+## コンテキスト
+
+- backend のテストスイートが 500 件規模（51 ファイル・約 670 テスト）に成長し、行カバレッジ（86%）だけでは「実装をなぞっているだけのテスト」「assertion が弱いテスト」を検出できなくなった。テストの**検出力**そのものを測る仕組みが必要。
+- GitHub 通知（メール / Web）は流量が多くノイズに埋もれるため、Slack へ移行し通知の種類ごとにチャンネルを分けたい。
+- ミューテーションテストはフル実行に数十分〜時間単位かかるため、PR ごとの CI（ci.yml）に入れるとブロッキングチェックとして開発体験を大きく損なう。
+
+## 決定内容
+
+### ツール選定
+
+| 領域 | ツール | 実行系 |
+|---|---|---|
+| backend | mutmut 3.x（`requirements.txt` で固定） | pytest を `mutants/` 内で in-process 実行 |
+| web | Stryker（`@stryker-mutator/core` + `@stryker-mutator/vitest-runner`） | 既存 vitest（`vite.config.ts` 内蔵設定）をそのまま利用 |
+
+- **backend は uv 管理ではない**（pyproject に `[project]` なし・lockfile は `requirements.txt`）ため、mutmut も既存慣例どおり `requirements.txt` にバージョン固定で追加する。
+- Stryker の TS checker は使わない（tsconfig が project-references + noEmit 構成のため）。ランナーは vitest-runner（peer: `vitest >=2.0.0`、vitest 4 対応確認済み）。
+
+### 対象スコープ（決定論的ビジネスロジックに限定）
+
+I/O 層・宣言層（schemas / models / routers / LLM クライアント / 自動生成コード / 定数カタログ）はテストで殺せないミュータントがノイズになるため対象外とし、テストで検証すべき純ロジックに絞る。
+
+- backend（`pyproject.toml` の `[tool.mutmut]` が正本）: blog スコアリング、billing（料金・クレジット計算）、skills 推論（aggregator / linguist / パーサ群）、repo_analyzer / contributions、shared（sort_utils / resume_format）、tasks/worker（状態遷移）
+- web（`web/stryker.conf.json` が正本）: `src/utils/**`、`formMappers.ts`、`payloadBuilders.ts`、`src/hooks/**`、store の slice、`constants/agentModels.ts`
+
+### 実行タイミングと fail ポリシー
+
+- 週次（毎週月曜 3:00 JST = cron `0 18 * * 0`）+ `workflow_dispatch` の専用ワークフロー `.github/workflows/mutation.yml`。backend / web は並列ジョブ。
+- **warn-only**（jscpd の Phase 1 と同じ方針）: 生存ミュータントがあってもワークフローは fail させず、Slack 通知とレポート artifact（14 日保持）で可視化する。閾値ゲート化は baseline 確定後に検討。
+
+### score の定義（backend / web 共通基準）
+
+```
+killed   = killed + timeout          # 無限ループ化もテストによる検出とみなす（Stryker と同基準）
+survived = survived + no_tests       # どのテストにも触れられない = 検出不能（Stryker の NoCoverage 相当）
+score    = killed * 100 / (killed + survived + suspicious + segfault)
+```
+
+閾値は `mutation.yml` の env `MUTATION_SCORE_THRESHOLD`（初期値 80%）。未満なら Slack 通知を ⚠️ で強調する。
+
+### pytest-cov との干渉回避
+
+mutmut は `mutants/` に app / tests / pyproject.toml をコピーし pytest を in-process 実行する。pyproject の `addopts` に `--cov` があると全ミュータント実行に coverage 計測が載り干渉するため、**`--cov=app --cov-report=term-missing` は addopts から外し、呼び出し側（Makefile `test-backend` / test.yml の pytest step）で付与する**。カバレッジ出力は従来どおり維持される。
+
+### Slack 通知チャンネル分割（4 Webhook）
+
+| Secret 名 | 用途 | 送信元 workflow | 通知条件 |
+|---|---|---|---|
+| `SLACK_WEBHOOK_URL_CI` | 通常 CI の失敗 | `notify.yml` | CI conclusion = failure のみ（cancelled は concurrency キャンセルのノイズのため通知しない） |
+| `SLACK_WEBHOOK_URL_DEPLOY` | Cloud Run / Cloudflare Pages デプロイ結果 | `notify.yml` | main/stg/dev への push で deploy ジョブが実行された run（成功・失敗とも） |
+| `SLACK_WEBHOOK_URL_QUALITY` | ミューテーションテスト結果 | `mutation.yml` | 週次 / 手動実行の完了時（killed / survived / score%、閾値未満は ⚠️ 強調） |
+| `SLACK_WEBHOOK_URL_DEPS` | 依存更新 PR の起票 | `deps-notify.yml` | renovate[bot] / dependabot[bot] の PR opened |
+
+- 送信は `slackapi/slack-github-action` v2（既存慣例どおり commit SHA ピン。Renovate `helpers:pinGitHubActionDigests` が以後管理）。
+- **Secrets はプレースホルダー**: Slack チャンネル未作成のため値は未登録。各通知ステップは `env` 経由の空判定で **Secret 未登録の間は静かに skip** され、ワークフローは green のまま（登録手順は `docs/development.md`）。
+
+### 通知の実装方式
+
+- **CI / デプロイ通知は `workflow_run`**（`workflows: ["CI"]` / `types: [completed]`）で受ける。ci.yml 側には一切手を入れず疎結合にする。workflow_run の payload にはジョブ単位の結果が無いため、jobs API（`permissions: actions: read` + runner 標準の `gh` CLI）で失敗ジョブ名・deploy ジョブ結果（再利用ワークフローは `deploy-dev / deploy-web` 形式で列挙）を補完する。
+- **依存更新通知は `pull_request_target` [opened]**: Dependabot actor の `pull_request` イベントは Actions secrets を参照できない（Dependabot secrets に分離される）ため。PR コードは checkout せず、actor をボットに限定しているため安全。
+- **インジェクション対策**: PR タイトル・display_title 等の外部入力は `run` スクリプトへ直接式展開せず `env` 経由で渡し、Slack payload へは `toJSON()` でエスケープして埋め込む。
+
+## 代替案
+
+- **mutmut ではなく cosmic-ray（backend）**: 並列実行は強いが設定が重く、pytest との統合と結果の可読性（`mutmut browse` / `export-cicd-stats`）で mutmut が優位。
+- **PR ごとの差分ミューテーション（incremental）**: 検出は早いが実行時間が PR CI を直撃する。まず週次で baseline を作る方が導入コストが低い。
+- **通知を ci.yml 内のジョブとして追加**: workflow_run より実装が単純だが、ci.yml / test.yml（再利用ワークフロー）に secrets 配線が増え、通知都合の変更が CI 本体の変更履歴に混ざる。疎結合な workflow_run を採用。
+- **DEPS 通知を `pull_request` トリガーで実装**: Dependabot の secrets 分離で Webhook が参照できず不成立。
+- **Slack App（chat.postMessage）方式**: チャンネル増減に強いが Bot トークン管理が必要。まず Incoming Webhook のチャンネル分割で開始し、必要になれば移行する。
+
+## トレードオフ・既知のリスク
+
+- **実行時間**: backend は実 SQLite に当てる統合テスト主体のため、フル実行が 120 分の timeout に達する可能性がある。その場合は `[tool.mutmut]` の対象を削るか `mutate_only_covered_lines` を検討する。
+- **warn-only 期間はスコア悪化を強制できない**: ゲート化までは Slack の ⚠️ 通知と週次レビュー運用が頼り。
+- **`slackapi/slack-github-action` の SHA は初回実行で要検証**: 導入時の実行環境から外部リポジトリの SHA 解決ができず、`v2.1.0` の SHA は事後検証前提でピンしている。初回の workflow_dispatch で action 解決に失敗した場合は SHA を修正する（Renovate の `pinDigests` が以後のバージョン追従を管理）。
+- **workflow_run のジョブ名依存**: deploy 通知は「ジョブ名が `deploy-` で始まる」ことに依存する。ci.yml のジョブ名を変更する場合は notify.yml の jq フィルタも見直すこと。
+- **週次 cron は main ブランチの定義でのみ発火**: feature ブランチ上の mutation.yml は schedule では動かない（workflow_dispatch で検証する）。
+
+## 将来の移行条件
+
+- baseline が安定したら `MUTATION_SCORE_THRESHOLD` を実測に合わせて調整し、`thresholds.break`（Stryker）/ CI ゲート化（mutmut）へ移行する。
+- 通知チャンネルが増えたら Incoming Webhook 方式から Slack App（Bot トークン + チャンネル指定）へ移行する。
+- backend が uv 管理（PEP 621 + uv.lock）へ移行した場合、mutmut は dev dependency group（`uv add --dev`）へ移す。
+
+## 関連リンク
+
+- `.github/workflows/mutation.yml` / `notify.yml` / `deps-notify.yml`
+- `backend/pyproject.toml`（`[tool.mutmut]` / pytest addopts）
+- `web/stryker.conf.json`
+- `docs/development.md`「ミューテーションテスト」節（ローカル実行・Secrets 登録手順）
+- ADR-0014（Renovate。Action の SHA ピン運用）
+- mutmut: https://mutmut.readthedocs.io/ / Stryker: https://stryker-mutator.io/docs/
diff --git a/docs/development.md b/docs/development.md
index 162f2a15..aeb96b11 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -159,3 +159,62 @@ make infra-validate         # dev / stg / prod を順に validate
 ```
 
 詳細は [deployment.md](./deployment.md) の「インフラ構成（OpenTofu）」を参照。
+
+### ミューテーションテスト（mutmut / Stryker）— 週次
+
+テストスイートの検出力（弱い assertion / 実装なぞりテスト）を測る（設計判断: [ADR-0017](./adr/0017-mutation-testing-and-slack-notifications.md)）。
+**フル実行は長時間かかるため通常 CI には含まれない。** 週次（毎週月曜 3:00 JST）の `.github/workflows/mutation.yml` が実行し、結果を Slack（`SLACK_WEBHOOK_URL_QUALITY`）へ通知する。手動実行は GitHub Actions の workflow_dispatch（`gh workflow run mutation.yml`）。
+
+```bash
+make mutation-backend   # mutmut（対象: backend/pyproject.toml の [tool.mutmut]）
+make mutation-web       # Stryker（対象: web/stryker.conf.json）
+```
+
+ローカルで短時間だけ試す場合（対象を絞る）:
+
+```bash
+# backend: ミュータント名のグロブで絞る（モジュールパス + '*'）
+nix develop --command bash -c "cd backend && .venv/bin/python -m mutmut run 'app.services.shared.sort_utils*'"
+# web: --mutate でファイルを絞る
+nix develop --command bash -c "cd web && npx stryker run --mutate 'src/utils/text.ts'"
+```
+
+結果の確認:
+
+```bash
+# backend: 生存ミュータント一覧 / TUI ブラウズ / CI 用 JSON（mutants/mutmut-cicd-stats.json）
+nix develop --command bash -c "cd backend && .venv/bin/python -m mutmut results"
+nix develop --command bash -c "cd backend && .venv/bin/python -m mutmut browse"
+# web: HTML レポート
+open web/reports/mutation/mutation.html
+```
+
+- 生成物（`backend/mutants/` / `web/reports/` / `web/.stryker-tmp/`）は gitignore 済み。
+- score が `MUTATION_SCORE_THRESHOLD`（初期値 80%。`mutation.yml` の env）未満だと Slack 通知が ⚠️ で強調される。Phase 1 は warn-only（fail しない）。
+
+## Slack 通知（CI / デプロイ / 品質 / 依存更新）
+
+GitHub Actions の結果を用途別の Slack チャンネルへ Incoming Webhook で通知する（[ADR-0017](./adr/0017-mutation-testing-and-slack-notifications.md)）。
+
+| GitHub Secret | 用途 | 送信元 workflow |
+|---|---|---|
+| `SLACK_WEBHOOK_URL_CI` | 通常 CI の失敗のみ | `notify.yml` |
+| `SLACK_WEBHOOK_URL_DEPLOY` | Cloud Run / Cloudflare Pages デプロイ結果（成功・失敗とも） | `notify.yml` |
+| `SLACK_WEBHOOK_URL_QUALITY` | 週次ミューテーションテスト結果（killed / survived / score） | `mutation.yml` |
+| `SLACK_WEBHOOK_URL_DEPS` | Renovate / Dependabot の依存更新 PR 起票 | `deps-notify.yml` |
+
+### Secrets の登録手順（チャンネル作成後）
+
+1. Slack で通知先チャンネルを作成し、各チャンネルに [Incoming Webhook](https://api.slack.com/messaging/webhooks) を発行する（チャンネルごとに 1 つ）
+2. 発行された Webhook URL を GitHub Secrets に登録する:
+
+   ```bash
+   gh secret set SLACK_WEBHOOK_URL_CI      --body "https://hooks.slack.com/services/..."
+   gh secret set SLACK_WEBHOOK_URL_DEPLOY  --body "https://hooks.slack.com/services/..."
+   gh secret set SLACK_WEBHOOK_URL_QUALITY --body "https://hooks.slack.com/services/..."
+   gh secret set SLACK_WEBHOOK_URL_DEPS    --body "https://hooks.slack.com/services/..."
+   ```
+
+3. 動作確認: `gh workflow run mutation.yml` を手動実行し QUALITY チャンネルへの通知を確認する
+
+> **Secret 未登録の間の挙動**: 各通知ステップは Webhook が空だと静かに skip される（ワークフローは green のまま）。チャンネル作成前に導入しても CI は壊れない。
diff --git a/web/package-lock.json b/web/package-lock.json
index 86600083..bc90b536 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -22,6 +22,8 @@
       "devDependencies": {
         "@eslint/js": "^10.0.0",
         "@playwright/test": "^1.56.0",
+        "@stryker-mutator/core": "^9.6.1",
+        "@stryker-mutator/vitest-runner": "^9.6.1",
         "@testing-library/jest-dom": "^6.9.1",
         "@testing-library/react": "^16.3.2",
         "@testing-library/user-event": "^14.6.1",
@@ -180,6 +182,19 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/helper-annotate-as-pure": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.29.7.tgz",
+      "integrity": "sha512-OoK6239jHPuSQOoS0kfTVKn0b/rVTk0seKq4Gd2UMLtmOVLjDC0ki3e+c90Trqv2gMfvJFqkiljrr568+qddiw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/types": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/helper-compilation-targets": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.29.7.tgz",
@@ -197,6 +212,28 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/helper-create-class-features-plugin": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.29.7.tgz",
+      "integrity": "sha512-IY3ZD9Tmooqr3TUhc3DUWxiuo8xx1DWLhd5M7hQ+ZWJamqM2BbalrBJb2MisSLoYorOj75U03qULCxQTY9r3hg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-annotate-as-pure": "^7.29.7",
+        "@babel/helper-member-expression-to-functions": "^7.29.7",
+        "@babel/helper-optimise-call-expression": "^7.29.7",
+        "@babel/helper-replace-supers": "^7.29.7",
+        "@babel/helper-skip-transparent-expression-wrappers": "^7.29.7",
+        "@babel/traverse": "^7.29.7",
+        "semver": "^6.3.1"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0"
+      }
+    },
     "node_modules/@babel/helper-globals": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-globals/-/helper-globals-7.29.7.tgz",
@@ -207,6 +244,20 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/helper-member-expression-to-functions": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.29.7.tgz",
+      "integrity": "sha512-j+7JYmk1JYDtACIGj0QJqqWZjoUpMoEikQGADMaHgCMCSDqd2+P32rfcibUNrGOMWrlzK1WJBdxrB3JJQZwWtg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/traverse": "^7.29.7",
+        "@babel/types": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/helper-module-imports": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.29.7.tgz",
@@ -239,6 +290,61 @@
         "@babel/core": "^7.0.0"
       }
     },
+    "node_modules/@babel/helper-optimise-call-expression": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.29.7.tgz",
+      "integrity": "sha512-+kmGVjcT9RGYzoDwdwEqEvGgKe3BYq+O1iGzjFubaNgZHwYHP6lsF2Yghf4kEuv9BV7tYDZ913aBW9am6YKong==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/types": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-plugin-utils": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.29.7.tgz",
+      "integrity": "sha512-G7sHYigPY17oO5SYWnfD/0MTBwVR781S/JI643e/JhUYgVgWE/61SoW3NH9KWUKyKq5LVh3npif99Wkt6j86Jw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-replace-supers": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.29.7.tgz",
+      "integrity": "sha512-atfGXWSeCiF4DnKZIfmJfQRkSw9b9gNNXR1kqKjbhG4pGYCOnkp8OcTB8E3NXjBu8NpheSnOeNKz8KT7UNFTmQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-member-expression-to-functions": "^7.29.7",
+        "@babel/helper-optimise-call-expression": "^7.29.7",
+        "@babel/traverse": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0"
+      }
+    },
+    "node_modules/@babel/helper-skip-transparent-expression-wrappers": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-skip-transparent-expression-wrappers/-/helper-skip-transparent-expression-wrappers-7.29.7.tgz",
+      "integrity": "sha512-brcMGQaVzIeUb+6/bs1Av0f8YuNNjKY2JyvfRCsFuFsdKccEQ5Ges2y74D74NZ1Rz8lKJ9ksJkfqwQFJ/iNEyQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/traverse": "^7.29.7",
+        "@babel/types": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/helper-string-parser": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.29.7.tgz",
@@ -299,6 +405,163 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/@babel/plugin-proposal-decorators": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-decorators/-/plugin-proposal-decorators-7.29.7.tgz",
+      "integrity": "sha512-EtU0Hi3GvrTqD56xKmZvV/uCXK2ZbwVNPNLAquVItcAZpUhkXwWlo3Fmj0c2LxgSf2I8IDULeAepwNP1OefLXg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-create-class-features-plugin": "^7.29.7",
+        "@babel/helper-plugin-utils": "^7.29.7",
+        "@babel/plugin-syntax-decorators": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-syntax-decorators": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-decorators/-/plugin-syntax-decorators-7.29.7.tgz",
+      "integrity": "sha512-9MTTLbF39X6sqM92JPEsoI7++26hjZvzkxKZy64aMhWLH2mPkJ/Q3AV4QLmls3R14FpSpkOwQQfUh962JGQxxg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-syntax-jsx": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-jsx/-/plugin-syntax-jsx-7.29.7.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-syntax-typescript": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-typescript/-/plugin-syntax-typescript-7.29.7.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-transform-destructuring": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-destructuring/-/plugin-transform-destructuring-7.29.7.tgz",
+      "integrity": "sha512-iPX8aD6H9zV5s7ZsqTdNocPN/MGQ5sSMnElKrktxjJRMnB2jN/1p2+R7GkfD6CAYoVFqy5A4XnSIUeGgJzIWpg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.29.7",
+        "@babel/traverse": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-transform-explicit-resource-management": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-explicit-resource-management/-/plugin-transform-explicit-resource-management-7.29.7.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.29.7",
+        "@babel/plugin-transform-destructuring": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-transform-modules-commonjs": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-modules-commonjs/-/plugin-transform-modules-commonjs-7.29.7.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-module-transforms": "^7.29.7",
+        "@babel/helper-plugin-utils": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/plugin-transform-typescript": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.29.7.tgz",
+      "integrity": "sha512-jK52h8LaLc7JarhQV2ofeFMts4H7vnOXnqZNA6fYglBTZewRBE51KWt3BUltW1P+KoPsYkHoJeXePuz4zo2LMw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-annotate-as-pure": "^7.29.7",
+        "@babel/helper-create-class-features-plugin": "^7.29.7",
+        "@babel/helper-plugin-utils": "^7.29.7",
+        "@babel/helper-skip-transparent-expression-wrappers": "^7.29.7",
+        "@babel/plugin-syntax-typescript": "^7.29.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
+    "node_modules/@babel/preset-typescript": {
+      "version": "7.28.5",
+      "resolved": "https://registry.npmjs.org/@babel/preset-typescript/-/preset-typescript-7.28.5.tgz",
+      "integrity": "sha512-+bQy5WOI2V6LJZpPVxY+yp66XdZ2yifu0Mc1aP5CQKgjn4QM5IN2i5fAZ4xKop47pr8rpVhiAeu+nDQa12C8+g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/helper-plugin-utils": "^7.27.1",
+        "@babel/helper-validator-option": "^7.27.1",
+        "@babel/plugin-syntax-jsx": "^7.27.1",
+        "@babel/plugin-transform-modules-commonjs": "^7.27.1",
+        "@babel/plugin-transform-typescript": "^7.28.5"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
     "node_modules/@babel/runtime": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.7.tgz",
@@ -1441,9 +1704,6 @@
         "arm"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -1461,9 +1721,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -1481,9 +1738,6 @@
         "ppc64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
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       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.5.tgz",
@@ -6310,6 +7114,43 @@
         "node": ">=12"
       }
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+    "node_modules/mutation-server-protocol": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/mutation-server-protocol/-/mutation-server-protocol-0.4.1.tgz",
+      "integrity": "sha512-SBGK0j8hLDne7bktgThKI8kGvGTx3rY3LAeQTmOKZ5bVnL/7TorLMvcVF7dIPJCu5RNUWhkkuF53kurygYVt3g==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "zod": "^4.1.12"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/mutation-testing-elements": {
+      "version": "3.7.3",
+      "resolved": "https://registry.npmjs.org/mutation-testing-elements/-/mutation-testing-elements-3.7.3.tgz",
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+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/mutation-testing-metrics": {
+      "version": "3.7.3",
+      "resolved": "https://registry.npmjs.org/mutation-testing-metrics/-/mutation-testing-metrics-3.7.3.tgz",
+      "integrity": "sha512-B8QrP0ZomErzTPNlhrzKWPNBln+3afwBZPHv0Q7N8wZZTYxMptzb/Gdm3ExXVmioVYrtZAtsDs7W/T/b2AixOQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "mutation-testing-report-schema": "3.7.3"
+      }
+    },
+    "node_modules/mutation-testing-report-schema": {
+      "version": "3.7.3",
+      "resolved": "https://registry.npmjs.org/mutation-testing-report-schema/-/mutation-testing-report-schema-3.7.3.tgz",
+      "integrity": "sha512-BHm3MYq+ckO+t5CtlG8zpqxc75rdJCkxVlE+fGuGJM3F7tNCQ/OW2N+TQVHN3BHsYa84+BFc6g3AwDYkUsw2MA==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
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       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-3.0.0.tgz",
@@ -6366,6 +7207,36 @@
         "node": ">=18"
       }
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+    "node_modules/npm-run-path": {
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+      "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-6.0.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "path-key": "^4.0.0",
+        "unicorn-magic": "^0.3.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/npm-run-path/node_modules/path-key": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-4.0.0.tgz",
+      "integrity": "sha512-haREypq7xkM7ErfgIyA0z+Bj4AGKlMSdlQE2jvJo6huWD1EdkKYV+G/T4nq0YEF2vgTT8kqMFKo1uHn950r4SQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/object-inspect": {
       "version": "1.13.4",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.4.tgz",
@@ -6525,6 +7396,19 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/parse-ms": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/parse-ms/-/parse-ms-4.0.0.tgz",
+      "integrity": "sha512-TXfryirbmq34y8QBwgqCVLi+8oA3oWx2eAnSn62ITyEhEYaWRlVZ2DvMM9eZbMs/RfxPu/PK/aBLyGj4IrqMHw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/parse5": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/parse5/-/parse5-8.0.1.tgz",
@@ -6735,6 +7619,32 @@
       "license": "MIT",
       "peer": true
     },
+    "node_modules/pretty-ms": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/pretty-ms/-/pretty-ms-9.3.0.tgz",
+      "integrity": "sha512-gjVS5hOP+M3wMm5nmNOucbIrqudzs9v/57bWRHQWLYklXqoXKrVfYW2W9+glfGsqtPgpiz5WwyEEB+ksXIx3gQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "parse-ms": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/progress": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
+      "integrity": "sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -7413,6 +8323,16 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/source-map": {
+      "version": "0.7.6",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.6.tgz",
+      "integrity": "sha512-i5uvt8C3ikiWeNZSVZNWcfZPItFQOsYTUAOkcUPGd8DqDy1uOUikjt5dG+uRlwyvR108Fb9DOd4GvXfT0N2/uQ==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -7501,6 +8421,19 @@
         "url": "https://github.com/chalk/ansi-regex?sponsor=1"
       }
     },
+    "node_modules/strip-final-newline": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-4.0.0.tgz",
+      "integrity": "sha512-aulFJcD6YK8V1G7iRB5tigAP4TsHBZZrOV8pjV++zdUwmeV8uzbY7yn6h9MswN62adStNZFuCIx4haBnRuMDaw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/strip-indent": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
@@ -7727,6 +8660,16 @@
       "dev": true,
       "license": "0BSD"
     },
+    "node_modules/tunnel": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.6.tgz",
+      "integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6.11 <=0.7.0 || >=0.7.3"
+      }
+    },
     "node_modules/type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -7789,6 +8732,49 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/typed-inject": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/typed-inject/-/typed-inject-5.0.0.tgz",
+      "integrity": "sha512-0Ql2ORqBORLMdAW89TQKZsb1PQkFGImFfVmncXWe7a+AA3+7dh7Se9exxZowH4kbnlvKEFkMxUYdHUpjYWFJaA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/typed-rest-client": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/typed-rest-client/-/typed-rest-client-2.3.1.tgz",
+      "integrity": "sha512-k4kX5Up6qA68D0Cby2AK+6+vM5k3qTxe+/3FqhnHRExjY5cfbOnzjQZbP/LXleF8hVoDvDqxlgk9KK83HoBZlQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "des.js": "^1.1.0",
+        "js-md4": "^0.3.2",
+        "qs": "6.15.1",
+        "tunnel": "0.0.6",
+        "underscore": "^1.13.8"
+      },
+      "engines": {
+        "node": ">= 16.0.0"
+      }
+    },
+    "node_modules/typed-rest-client/node_modules/qs": {
+      "version": "6.15.1",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.1.tgz",
+      "integrity": "sha512-6YHEFRL9mfgcAvql/XhwTvf5jKcOiiupt2FiJxHkiX1z4j7WL8J/jRHYLluORvc1XxB5rV20KoeK00gVJamspg==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "side-channel": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=0.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -7827,6 +8813,13 @@
         "typescript": ">=4.8.4 <6.1.0"
       }
     },
+    "node_modules/underscore": {
+      "version": "1.13.8",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.8.tgz",
+      "integrity": "sha512-DXtD3ZtEQzc7M8m4cXotyHR+FAS18C64asBYY5vqZexfYryNNnDc02W4hKg3rdQuqOYas1jkseX0+nZXjTXnvQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/undici": {
       "version": "7.28.0",
       "resolved": "https://registry.npmjs.org/undici/-/undici-7.28.0.tgz",
@@ -7854,6 +8847,19 @@
         "pathe": "^2.0.3"
       }
     },
+    "node_modules/unicorn-magic": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/unicorn-magic/-/unicorn-magic-0.3.0.tgz",
+      "integrity": "sha512-+QBBXBCvifc56fsbuxZQ6Sic3wqqc3WWaqxs58gvJrcOuN83HGTCwz3oS5phzU9LthRNE9VrJCFCLUgHeeFnfA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -8194,6 +9200,13 @@
         "loose-envify": "^1.0.0"
       }
     },
+    "node_modules/weapon-regex": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/weapon-regex/-/weapon-regex-1.3.6.tgz",
+      "integrity": "sha512-wsf1m1jmMrso5nhwVFJJHSubEBf3+pereGd7+nBKtYJ18KoB/PWJOHS3WRkwS04VrOU0iJr2bZU+l1QaTJ+9nA==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/webidl-conversions": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
@@ -8496,6 +9509,19 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/yoctocolors": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yoctocolors/-/yoctocolors-2.1.2.tgz",
+      "integrity": "sha512-CzhO+pFNo8ajLM2d2IW/R93ipy99LWjtwblvC1RsoSUMZgyLbYFr221TnSNT7GjGdYui6P459mw9JH/g/zW2ug==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/youch": {
       "version": "4.1.0-beta.10",
       "resolved": "https://registry.npmjs.org/youch/-/youch-4.1.0-beta.10.tgz",
diff --git a/web/package.json b/web/package.json
index de9cda3e..1d52f9c5 100644
--- a/web/package.json
+++ b/web/package.json
@@ -11,6 +11,7 @@
     "test:unit": "tsc --target ES2020 --module CommonJS --moduleResolution Node --strict --skipLibCheck --outDir .test-dist --rootDir src src/payloadBuilders.ts && node -e \"require('node:fs').writeFileSync('.test-dist/package.json', '{\\\"type\\\":\\\"commonjs\\\"}')\" && node --test tests/payloadBuilders.test.cjs",
     "test:vitest": "vitest run",
     "test:coverage": "vitest run --coverage",
+    "test:mutation": "stryker run",
     "test:e2e": "playwright test",
     "test:e2e:ui": "playwright test --ui",
     "lint": "eslint src/",
@@ -34,6 +35,8 @@
   "devDependencies": {
     "@eslint/js": "^10.0.0",
     "@playwright/test": "^1.56.0",
+    "@stryker-mutator/core": "^9.6.1",
+    "@stryker-mutator/vitest-runner": "^9.6.1",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
diff --git a/web/stryker.conf.json b/web/stryker.conf.json
new file mode 100644
index 00000000..3dfd6f3a
--- /dev/null
+++ b/web/stryker.conf.json
@@ -0,0 +1,34 @@
+{
+  "$schema": "./node_modules/@stryker-mutator/core/schema/stryker-schema.json",
+  "_comment": "ミューテーションテスト設定（ADR-0017）。対象は純ロジック層（utils / hooks / store slice / フォーム変換）に限定し、自動生成コード（src/api/generated.ts）・定数カタログ（constants/messages 等）・UI シェル（main.tsx / App.tsx / components）・型定義のみのファイルは対象外。週次 CI（.github/workflows/mutation.yml）で実行され、Phase 1 は warn-only（break: null）。TS checker は project-references + noEmit 構成のため使用しない",
+  "testRunner": "vitest",
+  "vitest": {
+    "configFile": "vite.config.ts"
+  },
+  "mutate": [
+    "src/utils/**/*.ts",
+    "src/formMappers.ts",
+    "src/payloadBuilders.ts",
+    "src/hooks/**/*.ts",
+    "src/store/*Slice.ts",
+    "src/constants/agentModels.ts",
+    "!src/**/*.test.ts",
+    "!src/**/*.test.tsx",
+    "!src/**/*.d.ts",
+    "!src/utils/pdfjs.ts"
+  ],
+  "checkers": [],
+  "reporters": ["progress", "clear-text", "html", "json"],
+  "htmlReporter": {
+    "fileName": "reports/mutation/mutation.html"
+  },
+  "jsonReporter": {
+    "fileName": "reports/mutation/mutation.json"
+  },
+  "thresholds": {
+    "high": 90,
+    "low": 80,
+    "break": null
+  },
+  "tempDirName": ".stryker-tmp"
+}