diff --git a/journey/research/260316_Ralph_Loop_참조_및_RAG_적용.md b/journey/research/260316_Ralph_Loop_참조_및_RAG_적용.md
index 5b312b2..cf631ab 100644
--- a/journey/research/260316_Ralph_Loop_참조_및_RAG_적용.md
+++ b/journey/research/260316_Ralph_Loop_참조_및_RAG_적용.md
@@ -70,9 +70,12 @@ tags: [research, ralph-loop, ai-coding, rag, grok, 참조]
 
 ## Unresolved
 
-- Codex 5.4 구독 환경에서 Ralph Loop 도구(Continue/Cursor/Aider) 연동 검증
 - 200GB 전체 인덱싱 시 비용·시간 추정
 
+## 검증
+
+- [ralph_loop_test/](./ralph_loop_test/) — fib(100) 테스트로 실패→수정→통과 루프 검증 완료 (2026-03-16)
+
 ## 관련 문서
 
 - [스킬 계약 문서 기반 컨텍스트 오케스트레이션 리서치](./260314_스킬_계약_문서_기반_컨텍스트_오케스트레이션_리서치.md)
diff --git a/journey/research/ralph_loop_test/__pycache__/fib.cpython-312.pyc b/journey/research/ralph_loop_test/__pycache__/fib.cpython-312.pyc
new file mode 100644
index 0000000..a007870
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diff --git a/journey/research/ralph_loop_test/__pycache__/test_fib.cpython-312-pytest-9.0.2.pyc b/journey/research/ralph_loop_test/__pycache__/test_fib.cpython-312-pytest-9.0.2.pyc
new file mode 100644
index 0000000..001cebb
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diff --git a/journey/research/ralph_loop_test/fib.py b/journey/research/ralph_loop_test/fib.py
new file mode 100644
index 0000000..4eb1e94
--- /dev/null
+++ b/journey/research/ralph_loop_test/fib.py
@@ -0,0 +1,14 @@
+"""랄프 루프 검증용. fib(n) 반환."""
+
+
+def fib(n: int) -> int:
+    if n <= 1:
+        return n
+    a, b = 0, 1
+    for _ in range(2, n + 1):
+        a, b = b, a + b
+    return b
+
+
+if __name__ == "__main__":
+    print(fib(100))
diff --git a/journey/research/ralph_loop_test/test_fib.py b/journey/research/ralph_loop_test/test_fib.py
new file mode 100644
index 0000000..5faa96e
--- /dev/null
+++ b/journey/research/ralph_loop_test/test_fib.py
@@ -0,0 +1,8 @@
+"""fib(100) 검증. 354224848179261915075이어야 함."""
+
+import pytest
+from fib import fib
+
+
+def test_fib_100():
+    assert fib(100) == 354224848179261915075