diff --git a/.Jules/palette.md b/.Jules/palette.md
deleted file mode 100644
index 84884829..00000000
--- a/.Jules/palette.md
+++ /dev/null
@@ -1,3 +0,0 @@
-## 2024-07-13 - R Backend Package without Frontend
-**Learning:** 본 프로젝트(aFIPC)는 순수 R 백엔드 패키지이며, HTML/React/CSS 등의 프론트엔드 UI 컴포넌트가 존재하지 않음을 재차 확인했습니다.
-**Action:** 사용자 인터페이스 개선(UX/a11y)을 적용할 대상이 없으므로, PR을 생성하지 않고 작업을 종료합니다.
diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index a8207a48..b8420c53 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -2,3 +2,8 @@
 **Vulnerability:** Unvalidated inputs passed to `if()` statements can cause process crashes (`condition has length > 1`) or unexpected coercion vulnerabilities.
 **Learning:** In R, optional boolean parameters that default to `NULL` should be validated using explicit runtime type validation (e.g., `if (!is.null(flag) && (!is.logical(flag) || length(flag) != 1 || is.na(flag)))`).
 **Prevention:** Always implement explicit runtime type validation for optional boolean parameters.
+
+## 2024-08-13 - Fix DoS vulnerability in readline integer coercion
+**Vulnerability:** Weak regex validation (`^[0-9]+$`) allows large numbers to be entered in `readline()` which coerces to `NA` via `as.integer()`, breaking `if` conditions and causing unhandled exceptions.
+**Learning:** In R, large integer inputs coerce to `NA` leading to unexpected vulnerabilities.
+**Prevention:** Use strictly bounded exact-match regex like `^[12]$` to prevent coercion crashes and DoS vulnerabilities.
diff --git a/.semgrepignore b/.semgrepignore
deleted file mode 100644
index 570a1149..00000000
--- a/.semgrepignore
+++ /dev/null
@@ -1 +0,0 @@
-packrat/**
diff --git a/R/aFIPC.R b/R/aFIPC.R
index 62546519..918e19b1 100644
--- a/R/aFIPC.R
+++ b/R/aFIPC.R
@@ -141,7 +141,7 @@ autoFIPC <-
       }
       for (attempt in seq_len(3)) {
         n <- readline(prompt = "Is it correct? (1: Yes 2: No) : ")
-        if (grepl("^[0-9]+$", n)) {
+        if (grepl("^[12]$", n)) {
           return(as.integer(n))
         }
       }
@@ -171,7 +171,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for oldform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }
@@ -390,7 +390,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for newform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }