diff --git a/docs/development/current/main/10-Now.md b/docs/development/current/main/10-Now.md
index ec479ad4..8109a43c 100644
--- a/docs/development/current/main/10-Now.md
+++ b/docs/development/current/main/10-Now.md
@@ -3,7 +3,7 @@
 ## Current Focus
 
 - Phase: `docs/development/current/main/phases/phase-29ao/README.md`
-- Next: Phase 29ao P35（TBD）
+- Next: Phase 29ao P36（TBD）
 
 ## Gate (SSOT)
 
diff --git a/docs/development/current/main/30-Backlog.md b/docs/development/current/main/30-Backlog.md
index 1cf41408..2f771db8 100644
--- a/docs/development/current/main/30-Backlog.md
+++ b/docs/development/current/main/30-Backlog.md
@@ -5,7 +5,7 @@ Scope: 「次にやる候補」を短く列挙するメモ。入口は `docs/dev
 
 ## Active
 
-- CorePlan migration: `docs/development/current/main/phases/phase-29ao/README.md`（Next: P35 TBD）
+- CorePlan migration: `docs/development/current/main/phases/phase-29ao/README.md`（Next: P36 TBD）
 
 ## Near-Term Candidates
 
diff --git a/docs/development/current/main/design/coreplan-migration-roadmap-ssot.md b/docs/development/current/main/design/coreplan-migration-roadmap-ssot.md
index 23f10e24..95b01b33 100644
--- a/docs/development/current/main/design/coreplan-migration-roadmap-ssot.md
+++ b/docs/development/current/main/design/coreplan-migration-roadmap-ssot.md
@@ -34,8 +34,8 @@ Related:
 ## 1.1 Current (active)
 
 - Active phase: `docs/development/current/main/phases/phase-29ao/README.md`
-- Next step: Phase 29ao P35 (TBD)
-- After P35: TBD
+- Next step: Phase 29ao P36 (TBD)
+- After P36: TBD
 
 ## 2. すでに固めた SSOT（再発防止の土台）
 
diff --git a/docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md b/docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md
new file mode 100644
index 00000000..1b7d13c1
--- /dev/null
+++ b/docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md
@@ -0,0 +1,54 @@
+---
+Status: SSOT
+Scope: strict/dev の CorePlan shadow-adopt 観測（タグ）の必須/禁止と回帰スモーク対応
+Related:
+- docs/development/current/main/phases/phase-29ae/README.md
+- docs/development/current/main/phases/phase-29ao/README.md
+- docs/development/current/main/design/coreplan-migration-roadmap-ssot.md
+---
+
+# CorePlan shadow-adopt tag coverage (SSOT)
+
+目的: “strict/dev の shadow adopt が踏まれた/踏まれていない” を、回帰スモークで安定に固定する。
+
+## 前提
+
+- タグは strict/dev の診断・観測用途であり、release の既定挙動を変えない。
+- 一部のスモークは `filter_noise` によりタグが落ちるため、タグ検証は raw output を参照する。
+
+## Tag vocabulary (SSOT)
+
+- Pattern1: `[coreplan/shadow_adopt:pattern1_simplewhile]`
+- Pattern2: `[coreplan/shadow_adopt:pattern2_break_subset]`
+- Pattern3: `[coreplan/shadow_adopt:pattern3_ifphi]`
+- Pattern5: `[coreplan/shadow_adopt:pattern5_infinite_early_exit]`
+- Pattern6: `[coreplan/shadow_adopt:pattern6_scan_with_init]`
+- Pattern7: `[coreplan/shadow_adopt:pattern7_split_scan]`
+
+## Required tags (positive gates)
+
+| Scenario | Smoke | Tag |
+|---|---|---|
+| Pattern1 strict shadow adopt | `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_strict_shadow_vm.sh` | `pattern1_simplewhile` |
+| Pattern2 break subset (planner) | `tools/smokes/v2/profiles/integration/apps/phase29ai_pattern2_break_plan_subset_ok_min_vm.sh` | `pattern2_break_subset` |
+| Pattern2 realworld (phase263) | `tools/smokes/v2/profiles/integration/apps/phase263_pattern2_seg_realworld_min_vm.sh` | `pattern2_break_subset` |
+| Pattern2 loopbodylocal (2 cases) | `tools/smokes/v2/profiles/integration/apps/phase29ab_pattern2_loopbodylocal_min_vm.sh` | `pattern2_break_subset` |
+| Pattern2 loopbodylocal seg (2 cases) | `tools/smokes/v2/profiles/integration/apps/phase29ab_pattern2_loopbodylocal_seg_min_vm.sh` | `pattern2_break_subset` |
+| Pattern3 If-Phi | `tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_vm.sh` | `pattern3_ifphi` |
+| Pattern5 strict shadow adopt | `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern5_strict_shadow_vm.sh` | `pattern5_infinite_early_exit` |
+| Pattern6 strict shadow adopt | `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern6_strict_shadow_vm.sh` | `pattern6_scan_with_init` |
+| Pattern7 strict shadow adopt | `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern7_strict_shadow_vm.sh` | `pattern7_split_scan` |
+
+## Forbidden tags (negative gates)
+
+| Scenario | Smoke | Forbidden tag |
+|---|---|---|
+| Pattern2 NotApplicable | `tools/smokes/v2/profiles/integration/apps/phase29ab_pattern2_seg_notapplicable_min_vm.sh` | `pattern2_break_subset` |
+| Pattern2 Freeze | `tools/smokes/v2/profiles/integration/apps/phase29ab_pattern2_seg_freeze_min_vm.sh` | `pattern2_break_subset` |
+| Pattern1 subset reject (extra stmt) | `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh` | `pattern1_simplewhile` |
+
+## Gate (SSOT)
+
+- Integration gate:
+  - `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
+  - このパックに “positive/negative” のタグ検証が含まれていることが前提。
diff --git a/docs/development/current/main/design/planfrag-ssot-registry.md b/docs/development/current/main/design/planfrag-ssot-registry.md
index 5a751d49..8abd5fc0 100644
--- a/docs/development/current/main/design/planfrag-ssot-registry.md
+++ b/docs/development/current/main/design/planfrag-ssot-registry.md
@@ -27,6 +27,7 @@ Scope: JoinIR plan/frag 導線（仕様不変）
 - Plan/Frag overview: `docs/development/current/main/design/edgecfg-fragments.md`
 - Pattern6/7 contracts: `docs/development/current/main/design/pattern6-7-contracts.md`
 - CorePlan Skeleton/Feature model: `docs/development/current/main/design/coreplan-skeleton-feature-model.md`
+- Shadow-adopt tag coverage SSOT: `docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md`
 - Post-PHI final form SSOT: `docs/development/current/main/design/post-phi-final-form-ssot.md`
 - Effect classification SSOT: `docs/development/current/main/design/effect-classification-ssot.md`
 - ExitKind/Cleanup/Effect contract SSOT: `docs/development/current/main/design/exitkind-cleanup-effect-contract-ssot.md`
diff --git a/docs/development/current/main/phases/phase-29ae/README.md b/docs/development/current/main/phases/phase-29ae/README.md
index c86bc9c7..39cad6d8 100644
--- a/docs/development/current/main/phases/phase-29ae/README.md
+++ b/docs/development/current/main/phases/phase-29ae/README.md
@@ -22,6 +22,7 @@ Goal: JoinIR の最小回帰セットを SSOT として固定する。
 - phase286_pattern9_* は plugins disabled 経路の mismatch があるため legacy pack 側で SKIP（phase29ae pack には含めない）
 - shadow adopt tag（`[coreplan/shadow_adopt:*]`）は `filter_noise` で除去される
 - タグ検証が必要な smoke は raw output（filter 前）を参照する
+- タグ coverage SSOT: `docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md`
 
 ## Header PHI Entry/Latch Contract (SSOT)
 
diff --git a/docs/development/current/main/phases/phase-29ao/P35-SHADOW-ADOPT-TAG-COVERAGE-SSOT-AND-PATTERN1-NEGATIVE-GATE-INSTRUCTIONS.md b/docs/development/current/main/phases/phase-29ao/P35-SHADOW-ADOPT-TAG-COVERAGE-SSOT-AND-PATTERN1-NEGATIVE-GATE-INSTRUCTIONS.md
new file mode 100644
index 00000000..774ed6aa
--- /dev/null
+++ b/docs/development/current/main/phases/phase-29ao/P35-SHADOW-ADOPT-TAG-COVERAGE-SSOT-AND-PATTERN1-NEGATIVE-GATE-INSTRUCTIONS.md
@@ -0,0 +1,72 @@
+---
+Status: Ready
+Scope: strict/dev の shadow adopt 観測を SSOT 化し、negative ケースを回帰で固定する（仕様不変）
+Related:
+- docs/development/current/main/phases/phase-29ao/README.md
+- docs/development/current/main/phases/phase-29ae/README.md
+- docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md
+---
+
+# Phase 29ao P35: Shadow-adopt tag coverage SSOT + Pattern1 negative gate
+
+## 目的
+
+- strict/dev の shadow adopt は「通った/通ってない」が出力で観測できるが、回帰で “どの smoke が何を保証するか” が曖昧になりやすい。
+- P35 は「タグの必須/禁止」の責務と対応 smoke を SSOT として固定し、抜けを 1 件（Pattern1 subset reject）埋める。
+
+## 非目的
+
+- release の既定挙動・エラー文字列・恒常ログの変更
+- 新しい環境変数追加
+- by-name のパターン名分岐追加
+
+## 成果物
+
+1. SSOT 追加（表形式）
+   - `docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md`
+2. negative gate 追加（Pattern1 subset reject）
+   - `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh`
+3. 参照導線の追記（任意）
+   - `docs/development/current/main/design/planfrag-ssot-registry.md`
+
+## 実装手順
+
+### Step 1: coverage SSOT を追加
+
+- 新規作成:
+  - `docs/development/current/main/design/coreplan-shadow-adopt-tag-coverage-ssot.md`
+- 内容:
+  - “必須タグ / 禁止タグ / 対応 smoke / raw output 参照の理由” を 1 枚にまとめる
+
+### Step 2: Pattern1 subset reject を negative gate にする
+
+- 変更:
+  - `tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh`
+- 追加するチェック:
+  - strict/dev 実行の raw output に `[coreplan/shadow_adopt:pattern1_simplewhile]` が出たら FAIL
+  - 既存の exit code=3 期待は維持（副作用 drop 誤マッチ検出の本体）
+
+### Step 3: SSOT registry に参照追加（任意）
+
+- 更新:
+  - `docs/development/current/main/design/planfrag-ssot-registry.md`
+- `References` に coverage SSOT を 1 行追加
+
+### Step 4: Phase 29ao の進捗を更新
+
+- 更新:
+  - `docs/development/current/main/phases/phase-29ao/README.md`
+  - `docs/development/current/main/10-Now.md`
+  - `docs/development/current/main/30-Backlog.md`
+  - `docs/development/current/main/design/coreplan-migration-roadmap-ssot.md`（Next のみ）
+
+## 検証（必須）
+
+- `cargo build --release`
+- `./tools/smokes/v2/run.sh --profile quick`
+- `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
+
+## コミット
+
+- `git add -A`
+- `git commit -m "phase29ao(p35): ssot shadow-adopt tag coverage and pattern1 negative gate"`
diff --git a/docs/development/current/main/phases/phase-29ao/README.md b/docs/development/current/main/phases/phase-29ao/README.md
index 61c1e84a..d3244469 100644
--- a/docs/development/current/main/phases/phase-29ao/README.md
+++ b/docs/development/current/main/phases/phase-29ao/README.md
@@ -196,7 +196,12 @@ Gate（SSOT）:
 - 指示書: `docs/development/current/main/phases/phase-29ao/P34-PATTERN2-NEGATIVE-SHADOW-ADOPT-TAG-GATES-INSTRUCTIONS.md`
 - ねらい: `phase29ab_pattern2_seg_{freeze,notapplicable}` で shadow adopt タグが出ないことを回帰で固定（仕様不変）
 
+## P35: Shadow-adopt tag coverage SSOT + Pattern1 negative gate ✅
+
+- 指示書: `docs/development/current/main/phases/phase-29ao/P35-SHADOW-ADOPT-TAG-COVERAGE-SSOT-AND-PATTERN1-NEGATIVE-GATE-INSTRUCTIONS.md`
+- ねらい: タグ必須/禁止を SSOT 化し、Pattern1 subset reject の negative gate を回帰で固定（仕様不変）
+
 ## Next（planned）
 
-- Next: P35（TBD）
-- After P35: TBD
+- Next: P36（TBD）
+- After P36: TBD
diff --git a/tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh b/tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh
index 1f94f62e..8b7fe3fa 100644
--- a/tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh
+++ b/tools/smokes/v2/profiles/integration/joinir/phase29ao_pattern1_subset_reject_extra_stmt_vm.sh
@@ -12,6 +12,7 @@ require_env || exit 2
 
 FIXTURE="$NYASH_ROOT/apps/tests/phase29ao_pattern1_subset_reject_extra_stmt.hako"
 RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-10}
+SHADOW_TAG='[coreplan/shadow_adopt:pattern1_simplewhile]'
 
 set +e
 OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1 "$NYASH_BIN" --backend vm "$FIXTURE" 2>&1)
@@ -29,5 +30,11 @@ if [ "$EXIT_CODE" -ne 3 ]; then
     exit 1
 fi
 
+if echo "$OUTPUT" | grep -qF "$SHADOW_TAG"; then
+    log_error "phase29ao_pattern1_subset_reject_extra_stmt_vm: shadow adopt tag must not appear: $SHADOW_TAG"
+    echo "$OUTPUT"
+    exit 1
+fi
+
 log_success "phase29ao_pattern1_subset_reject_extra_stmt_vm: PASS (exit=3)"
 exit 0