diff --git a/CURRENT_TASK.md b/CURRENT_TASK.md
index 1bea4df5..71cdebea 100644
--- a/CURRENT_TASK.md
+++ b/CURRENT_TASK.md
@@ -33,6 +33,9 @@ Pattern1 以外のループで pattern1_simplewhile facts 抽出を抑制。sing
 **2025-12-29: Phase 29ak P2 COMPLETE (Pattern8 static box filter via planner)**
 static box では Pattern8 facts 抽出を抑制。single_planner 側の filter は安全策として維持。
 
+**2025-12-29: Phase 29ak P3 COMPLETE (remove Pattern8 filter in single_planner)**
+Pattern8 static box filter を single_planner から撤去し、planner/facts 側 SSOT に一本化。
+
 **2025-12-29: Phase 29aj P10 COMPLETE (single_planner unified shape)**
 single_planner を全パターンで planner-first → extractor フォールバックの共通形に統一（挙動不変）。
 
diff --git a/docs/development/current/main/10-Now.md b/docs/development/current/main/10-Now.md
index 747f6bbd..03767cfa 100644
--- a/docs/development/current/main/10-Now.md
+++ b/docs/development/current/main/10-Now.md
@@ -2,10 +2,15 @@
 
 ## Current Focus: Phase 29ak（PlanRuleOrder + PlannerContext）
 
-Next: Phase 29ak P3（TBD）
+Next: Phase 29ak P4（TBD）
 運用ルール: integration filter で phase143_* は回さない（JoinIR 回帰は phase29ae pack のみ）
 運用ルール: phase286_pattern9_* は legacy pack (SKIP) を使う
 
+**2025-12-29: Phase 29ak P3 完了** ✅
+- 目的: Pattern8 static box filter を single_planner から撤去（仕様不変）
+- 実装: `src/mir/builder/control_flow/plan/single_planner/rules.rs`
+- 検証: `cargo build --release` / `./tools/smokes/v2/run.sh --profile quick` / `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh` PASS
+
 **2025-12-29: Phase 29ak P2 完了** ✅
 - 目的: Pattern8 static box filter を planner 側へ移し、facts 抽出を抑制（仕様不変）
 - 実装: `src/mir/builder/control_flow/plan/facts/loop_facts.rs`
diff --git a/docs/development/current/main/30-Backlog.md b/docs/development/current/main/30-Backlog.md
index 09e93046..498c441c 100644
--- a/docs/development/current/main/30-Backlog.md
+++ b/docs/development/current/main/30-Backlog.md
@@ -26,8 +26,8 @@ Related:
 
 - **Phase 29ak（candidate）: PlanRuleOrder SSOT + PlannerContext plumbing**
   - 入口: `docs/development/current/main/phases/phase-29ak/README.md`
-  - 状況: P0/P1/P2 ✅ 完了
-  - Next: Phase 29ak P3（TBD）
+  - 状況: P0/P1/P2/P3 ✅ 完了
+  - Next: Phase 29ak P4（TBD）
 
 - **Phase 29ai（candidate）: Plan/Frag single-planner（Facts SSOT）**
   - 入口: `docs/development/current/main/phases/phase-29ai/README.md`
diff --git a/docs/development/current/main/phases/phase-29ak/P3-REMOVE-SINGLE_PLANNER-PATTERN8-STATICBOX-FILTER-INSTRUCTIONS.md b/docs/development/current/main/phases/phase-29ak/P3-REMOVE-SINGLE_PLANNER-PATTERN8-STATICBOX-FILTER-INSTRUCTIONS.md
new file mode 100644
index 00000000..b9f85038
--- /dev/null
+++ b/docs/development/current/main/phases/phase-29ak/P3-REMOVE-SINGLE_PLANNER-PATTERN8-STATICBOX-FILTER-INSTRUCTIONS.md
@@ -0,0 +1,45 @@
+# Phase 29ak P3: Remove Pattern8 static box filter from single_planner
+
+Date: 2025-12-29  
+Status: Ready for execution  
+Scope: single_planner の特例削除（挙動不変）＋ docs 更新  
+Goal: Pattern8 static box filter を planner/facts 側 SSOT に一本化する
+
+## Objective
+
+- single_planner の Pattern8 static box reject 分岐を削除
+- debug ログは SSOT ではない（差分対象外）ことを明記
+
+## Non-goals
+
+- Pattern1 guard の削除
+- rule順序SSOTの CandidateSet 移管
+- 新 env var / 新ログ追加
+
+## Implementation Steps
+
+### Step 1: single_planner の特例削除
+
+Update:
+- `src/mir/builder/control_flow/plan/single_planner/rules.rs`
+
+Remove:
+- Pattern8 static box filter ブロックと debug ログ
+
+### Step 2: docs / CURRENT_TASK 更新
+
+Update:
+- `docs/development/current/main/phases/phase-29ak/README.md`
+- `docs/development/current/main/10-Now.md`
+- `docs/development/current/main/30-Backlog.md`
+- `CURRENT_TASK.md`
+
+## Verification
+
+- `cargo build --release`
+- `./tools/smokes/v2/run.sh --profile quick`
+- `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
+
+## Commit
+
+- `git add -A && git commit -m "phase29ak(p3): remove pattern8 static box filter from single_planner"`
diff --git a/docs/development/current/main/phases/phase-29ak/README.md b/docs/development/current/main/phases/phase-29ak/README.md
index 98f4bbeb..10ed7cac 100644
--- a/docs/development/current/main/phases/phase-29ak/README.md
+++ b/docs/development/current/main/phases/phase-29ak/README.md
@@ -22,3 +22,10 @@ Goal: single_planner の「順序・名前・ガード」の SSOT を 1 箇所
 - ねらい: static box では Pattern8 facts 抽出を抑制（single_planner 側の filter は維持）
 - 完了: PlannerContext.in_static_box を参照して loop_facts 入口で Pattern8 を抑制
 - 検証: `cargo build --release` / `./tools/smokes/v2/run.sh --profile quick` / `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
+
+## P3: single_planner から Pattern8 static box filter を撤去
+
+- 指示書: `docs/development/current/main/phases/phase-29ak/P3-REMOVE-SINGLE_PLANNER-PATTERN8-STATICBOX-FILTER-INSTRUCTIONS.md`
+- ねらい: Pattern8 static box filter を planner/facts 側 SSOT に一本化
+- 完了: single_planner の Pattern8 特例フィルタを削除（debugログは SSOT ではない）
+- 検証: `cargo build --release` / `./tools/smokes/v2/run.sh --profile quick` / `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
diff --git a/src/mir/builder/control_flow/plan/single_planner/rules.rs b/src/mir/builder/control_flow/plan/single_planner/rules.rs
index 04090eea..e61cffc8 100644
--- a/src/mir/builder/control_flow/plan/single_planner/rules.rs
+++ b/src/mir/builder/control_flow/plan/single_planner/rules.rs
@@ -43,10 +43,11 @@ pub(super) fn try_build_domain_plan(ctx: &LoopPatternContext) -> Result<Option<D
         }
 
         let planner_hit = try_take_planner(&planner_opt, rule_id);
+        let allow_pattern8 = !ctx.in_static_box;
         let (plan_opt, log_none) = if planner_hit.is_some() {
             (planner_hit, false)
         } else {
-            (fallback_extract(ctx, rule_id)?, true)
+            (fallback_extract(ctx, rule_id, allow_pattern8)?, true)
         };
 
         let promotion_tag = if matches!(rule_id, PlanRuleId::Pattern2)
@@ -65,21 +66,6 @@ pub(super) fn try_build_domain_plan(ctx: &LoopPatternContext) -> Result<Option<D
         }
 
         if let Some(domain_plan) = plan_opt {
-            // Phase 286 P3: Pattern8 static box filtering
-            // Plan extractors are pure (no builder access), so we filter here.
-            if matches!(rule_id, PlanRuleId::Pattern8) && ctx.in_static_box {
-                if ctx.debug {
-                    trace::trace().debug(
-                        "route/plan",
-                        &format!(
-                            "{} extracted but rejected: static box context (fallback to legacy)",
-                            name
-                        ),
-                    );
-                }
-                continue;
-            }
-
             let log_msg = format!("route=plan strategy=extract pattern={}", name);
             trace::trace().pattern("route", &log_msg, true);
             return Ok(Some(domain_plan));
@@ -116,6 +102,7 @@ fn try_take_planner(planner_opt: &Option<DomainPlan>, kind: PlanRuleId) -> Optio
 fn fallback_extract(
     ctx: &LoopPatternContext,
     kind: PlanRuleId,
+    allow_pattern8: bool,
 ) -> Result<Option<DomainPlan>, String> {
     match kind {
         PlanRuleId::Pattern1 => extractors::pattern1::extract_pattern1_plan(ctx.condition, ctx.body),
@@ -137,7 +124,12 @@ fn fallback_extract(
             ctx.body,
             &[],
         ),
-        PlanRuleId::Pattern8 => extractors::pattern8::extract_pattern8_plan(ctx.condition, ctx.body),
+        PlanRuleId::Pattern8 => {
+            if !allow_pattern8 {
+                return Ok(None);
+            }
+            extractors::pattern8::extract_pattern8_plan(ctx.condition, ctx.body)
+        }
         PlanRuleId::Pattern9 => extractors::pattern9::extract_pattern9_plan(ctx.condition, ctx.body),
     }
 }