diff --git a/CURRENT_TASK.md b/CURRENT_TASK.md
index 05b3f7f4..ab25f69c 100644
--- a/CURRENT_TASK.md
+++ b/CURRENT_TASK.md
@@ -39,7 +39,7 @@ Update — 2025-09-28 (json_query_vm PASS・最終ガード適用)
 
 Update — 2025-10-31 (Phase 20.33 bring-up)
 - Stage-A map literal parser hardened（空／空白／エスケープ）; quick `index_operator_hako` expands coverage。
-- Stage-B entry separated (`lang/src/compiler/entry/compiler_stageb.hako`); FlowEntry `emit_v0_from_ast_with_context` (using/extern) を既定採用。`--v1-compat` で MirJsonV1Adapter 経路へ opt-in。opt-in canaries（binop/if/index + nested/boundary、v1）緑。
+- Stage-B entry separated (`lang/src/compiler/entry/compiler_stageb.hako`); `compiler.hako -- --stage-b` から StageBMain を呼び出し、FlowEntry `emit_v0_from_ast_with_context` (using/extern) を既定採用。`--v1-compat` は MirJsonV1Adapter 経路へ opt-in（現状は未配線のため SKIP）。opt-in canaries（binop/if/index + nested/boundary…）は Stage-B 本体が未整備な場合は SKIP 振る舞い。
 - `nyash.toml` modules updated to expose lang/compiler/shared/vm namespaces for resolver。
 - quick profile: 72/72 PASS（FileBox 未展開時は SKIP ハンドリング）。
 
diff --git a/lang/src/compiler/entry/compiler.hako b/lang/src/compiler/entry/compiler.hako
index 6aebab2d..f93f1800 100644
--- a/lang/src/compiler/entry/compiler.hako
+++ b/lang/src/compiler/entry/compiler.hako
@@ -2,6 +2,8 @@
 // - When invoked with --min-json, emit minimal Program JSON v0 to stdout
 // - Otherwise, act as a silent placeholder (return 0)
 
+using "lang/src/compiler/entry/compiler_stageb.hako" as StageBMain
+
 static box Main {
   _parse_signed_int(raw) {
     if raw == null { return null }
@@ -28,7 +30,7 @@ static box Main {
 
   _collect_flags(args) {
     // Stage-A flags: emit/source/return only
-    local flags = { emit: 0, ret: null, source: null }
+    local flags = { emit: 0, ret: null, source: null, stage_b: 0 }
     if args == null { return flags }
 
     local i = 0
@@ -37,6 +39,8 @@ static box Main {
       local token = "" + args.get(i)
       if token == "--min-json" {
         flags.emit = 1
+      } else if token == "--stage-b" {
+        flags.stage_b = 1
       } else if token == "--source" && i + 1 < n {
         flags.source = "" + args.get(i + 1)
         i = i + 1
@@ -464,6 +468,9 @@ static box Main {
 
   main(args) {
     local flags = me._collect_flags(args)
+    if flags.stage_b == 1 {
+      return StageBMain.main(args)
+    }
     if flags.emit == 1 {
       local json = me._compile_source_to_json_v0(flags.source)
       print(json)