build: validate duplicate MCP tool names before packaging

build.gradle

@@ -49,3 +49,20 @@ subprojects {
         useJUnitPlatform()
     }
 }
+
+def toolCoreProject = project(':dap-tool-core')
+
+tasks.register('validateMcpToolNames', JavaExec) {
+    group = 'verification'
+    description = 'Checks duplicate @McpFunction names across all Tool modules before packaging.'
+    dependsOn toolCoreProject.tasks.named('classes')
+    classpath = toolCoreProject.sourceSets.main.runtimeClasspath
+    mainClass.set('io.shinhanlife.dap.lib.validation.McpToolNameValidationRunner')
+    args rootProject.projectDir.absolutePath
+}
+
+subprojects {
+    tasks.matching { it.name == 'bootJar' }.configureEach {
+        dependsOn rootProject.tasks.named('validateMcpToolNames')
+    }
+}