diff --git a/docs/development/current/main/phases/phase-288/README.md b/docs/development/current/main/phases/phase-288/README.md
index 4ab743cd..8841899f 100644
--- a/docs/development/current/main/phases/phase-288/README.md
+++ b/docs/development/current/main/phases/phase-288/README.md
@@ -16,10 +16,11 @@ SSOT:
 
 ## Completed (P0–P3)
 
-- P0: SSOT doc established/updated (`docs/reference/language/repl.md`)
-- P1: CLI entry point (`--repl` / `-i`)
-- P2: REPL session state isolated (Box-first; runtime-value based)
-- P3: Minimal UX and docs polish
+- ✅ **P0 (docs)**: REPL SSOT 確立 — file mode vs REPL mode 意味論、VMValue 永続化方針 (`docs/reference/language/repl.md` 336行)
+- ✅ **P1 (CLI)**: `--repl` / `-i` 起動、.help/.exit/.reset コマンド、REPL ループ実装
+- ✅ **P2 (state)**: `ReplSessionBox` (VMValue ベース) 実装、暗黙 local 許可（file mode 不変、ValueId 永続化回避）
+- ✅ **P3 (UX)**: print() 出力表示、Main box wrapper（VM entry point 修正）、.reset 実装
+- ✅ **Box化**: `src/runner/repl/` モジュール分離（ReplRunnerBox）、runner/mod.rs -118行 (commit: 3445ef7a7)
 
 ## Next (Phase 288.1)
 
@@ -30,4 +31,3 @@ The MVP intentionally deferred these:
 - Multi-line input handling (continuations)
 
 Entry: `docs/development/current/main/phases/phase-288/P1-INSTRUCTIONS.md`
-
diff --git a/docs/reference/language/repl.md b/docs/reference/language/repl.md
index 6b2317a1..b41ea49e 100644
--- a/docs/reference/language/repl.md
+++ b/docs/reference/language/repl.md
@@ -1,6 +1,6 @@
 # REPL Mode (Read–Eval–Print Loop) — Specification (SSOT)
 
-**Status**: Phase 288 MVP Implementation (2025-12-25) — partial (dev tool)
+**Status**: Phase 288 P0–P3 complete (2025-12-25, MVP) / Phase 288.1 next (session persistence + auto-display)
 
 ## Philosophy: Two Execution Contexts, One Language