diff --git a/build.gradle.kts b/build.gradle.kts
index 4020069..3367772 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,3 +1,9 @@
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.TaskAction
+import org.gradle.process.ExecOperations
+import javax.inject.Inject
+import java.io.ByteArrayOutputStream
+
 plugins {
     kotlin("jvm") version "1.9.25" apply false
     kotlin("plugin.spring") version "1.9.25" apply false
@@ -24,3 +30,101 @@ subprojects {
         useJUnitPlatform()
     }
 }
+
+abstract class FindBuildModuleTask @Inject constructor(
+    private val execOps: ExecOperations
+) : DefaultTask() {
+
+    @TaskAction
+    fun run() {
+        val allowedBuildModules = listOf(
+            "exporter",
+            "ai",
+            "cli"
+        )
+
+        fun execAndCapture(vararg cmd: String): String {
+            val output = ByteArrayOutputStream()
+            execOps.exec {
+                commandLine(*cmd)
+                standardOutput = output
+                errorOutput = ByteArrayOutputStream()
+                isIgnoreExitValue = true
+            }
+            return output.toString().trim()
+        }
+
+        val currentBranch = execAndCapture("git", "rev-parse", "--abbrev-ref", "HEAD")
+        println("🔍 현재 브랜치: $currentBranch")
+
+        execOps.exec {
+            commandLine("git", "fetch", "origin", "master")
+            isIgnoreExitValue = true
+        }
+
+        val mergeBaseOutput = ByteArrayOutputStream()
+        execOps.exec {
+            commandLine("git", "merge-base", "HEAD", "origin/master")
+            standardOutput = mergeBaseOutput
+            isIgnoreExitValue = true
+        }
+        val mergeBase = mergeBaseOutput.toString().trim()
+
+        if (mergeBase.isBlank()) {
+            println("⚠️ merge-base를 찾을 수 없습니다. 브랜치 동기화 상태를 확인하세요.")
+            return
+        }
+
+        val diffOutput = ByteArrayOutputStream()
+        execOps.exec {
+            commandLine(
+                "bash", "-c", """
+                    git diff --name-only $mergeBase..HEAD
+                    git diff --cached --name-only
+                    git diff --name-only
+                """.trimIndent()
+            )
+            standardOutput = diffOutput
+            isIgnoreExitValue = true
+        }
+
+        val changedFiles = diffOutput.toString().trim().lines().filter { it.isNotBlank() }
+
+        if (changedFiles.isEmpty()) {
+            println("✅ 변경된 파일이 없습니다.")
+            return
+        }
+
+        val changedModules = mutableSetOf<String>()
+        val rootPath = project.rootDir.absolutePath
+
+        project.rootProject.subprojects.forEach { sub ->
+            val relPath = sub.projectDir.absolutePath
+                .replace(rootPath + File.separator, "")
+                .replace("\\", "/")
+
+            changedFiles.forEach { file ->
+                if (file.startsWith("$relPath/") && allowedBuildModules.contains(sub.name)) {
+                    changedModules += sub.name
+                }
+            }
+        }
+
+        println()
+        println("🟨 감지된 빌드 대상 모듈 (exporter, ai, cli 한정)")
+        if (changedModules.isEmpty()) {
+            println(" (없음)")
+        } else {
+            changedModules.forEach { println(" - $it") }
+        }
+
+        println()
+        println("[참고] master와 diff 기준으로 감지되므로, 브랜치가 오래되면 결과 정확도가 떨어질 수 있습니다.")
+    }
+}
+
+tasks.register<FindBuildModuleTask>("findBuildModule") {
+    group = "build analysis"
+    description = "Detect changed modules among exporter, ai, cli only"
+}
+