diff --git a/.Rbuildignore b/.Rbuildignore
index 8989c62f..11922399 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -24,3 +24,15 @@
 ^\.jules(/.*)?$
 ^\.trivyignore\.yaml$
 ^trivy\.yaml$
+^mockery$
+^\.semgrepignore$
+^\.gitleaks\.toml$
+^\.yamllint\.yml$
+^trivy\.yaml$
+^\.Jules$
+^AGENTS\.md$
+^ARCHITECTURE\.md$
+^CLAUDE\.md$
+^CONTRIBUTING\.md$
+^\.jules$
+^\.markdownlint\.json$
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 6f24d72a..50423455 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -11,3 +11,5 @@ updates:
     commit-message:
       prefix: "chore"
       include: "scope"
+    cooldown:
+      default-days: 7
diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index a8207a48..354e2639 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -2,3 +2,7 @@
 **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.
+## 2024-07-25 - 대화형 입력값 검증 강화
+**Vulnerability:** `readline()`으로 받은 입력을 `grepl("^[0-9]+$", n)`과 같은 정규식으로만 검증할 경우, 매우 긴 숫자 문자열 입력 시 `as.integer()`에서 정수 오버플로가 발생하여 `NA`가 반환되고 이는 프로세스 크래시(DoS)로 이어질 수 있음.
+**Learning:** 제한된 옵션을 갖는 대화형 숫자를 검증할 때는 오버플로우 우회 공격 및 의도치 않은 캐스팅 오류를 방지하기 위해 반드시 완전 일치 검사(예: `n %in% c("1", "2")`)를 사용해야 함.
+**Prevention:** 대화형 입력값에 대해 항상 허용된 값들의 집합과 완전 일치하는지 엄격히 검증하도록 함.
diff --git a/.markdownlint.json b/.markdownlint.json
new file mode 100644
index 00000000..2a8f612b
--- /dev/null
+++ b/.markdownlint.json
@@ -0,0 +1,5 @@
+{
+  "MD013": false,
+  "MD041": false,
+  "MD022": false
+}
diff --git a/.yamllint.yml b/.yamllint.yml
index 7c7978a4..15351959 100644
--- a/.yamllint.yml
+++ b/.yamllint.yml
@@ -6,3 +6,6 @@ rules:
     max: 140
   truthy:
     allowed-values: ["true", "false", "on", "off"]
+
+ignore: |
+  packrat/
diff --git a/DESCRIPTION b/DESCRIPTION
index f31d3e1a..c90753c5 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -10,7 +10,7 @@ Description: Automates fixed item parameter linking for test linking under
     the item response theory paradigm using mirt package estimates.
 License: GPL-3 | file LICENSE
 Imports: mirt, methods
-Suggests: testthat (>= 3.0.0)
+Suggests: testthat (>= 3.0.0), mockery
 Encoding: UTF-8
 Config/testthat/edition: 3
 Config/roxygen2/version: 8.0.0
diff --git a/R/aFIPC.R b/R/aFIPC.R
index 62546519..118aca09 100644
--- a/R/aFIPC.R
+++ b/R/aFIPC.R
@@ -141,7 +141,7 @@ autoFIPC <-
       }
       for (attempt in seq_len(3)) {
         n <- readline(prompt = "Is it correct? (1: Yes 2: No) : ")
-        if (grepl("^[0-9]+$", n)) {
+        if (n %in% c("1", "2")) {
           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]+$", n)) {
+            if (n %in% c("1", "2")) {
               return(as.integer(n))
             }
           }
@@ -390,7 +390,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for newform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (n %in% c("1", "2")) {
               return(as.integer(n))
             }
           }
diff --git a/tests/testthat/test-sentinel-validation.R b/tests/testthat/test-sentinel-validation.R
index 900f0ee3..79a55b95 100644
--- a/tests/testthat/test-sentinel-validation.R
+++ b/tests/testthat/test-sentinel-validation.R
@@ -35,3 +35,24 @@ test_that("autoFIPC validates boolean flags for newformBILOGprior, oldformBILOGp
     "Security Error: confirmCommonItems must be a single non-NA logical value or NULL"
   )
 })
+
+test_that("interactive readline validation prevents integer overflow coercion DOS", {
+  # We test this behavior by verifying that the function checkCorrect requires exact match,
+  # but since readline is mocked/not available here, we will test the exact match logic indirectly.
+  # If we replace readline with a mock that returns an invalid string, it should exhaust attempts
+  # and stop with an error, not crash with a condition > 1 error.
+
+  mockery::stub(aFIPC::autoFIPC, "interactive", TRUE)
+  mockery::stub(aFIPC::autoFIPC, "readline", "1000000000000000000000000000000000")
+
+  expect_error(
+    aFIPC::autoFIPC(
+      newformXData = data.frame(A=1),
+      oldformYData = data.frame(A=2),
+      newformCommonItemNames = c('A'),
+      oldformCommonItemNames = c('A'),
+      confirmCommonItems = NULL
+    ),
+    "Too many invalid common item confirmation attempts"
+  )
+})