diff --git a/ceres/src/api_service/mono_api_service.rs b/ceres/src/api_service/mono_api_service.rs
index a3fef9e19..291d6ec24 100644
--- a/ceres/src/api_service/mono_api_service.rs
+++ b/ceres/src/api_service/mono_api_service.rs
@@ -581,6 +581,7 @@ impl MonoApiService {
     pub async fn get_sorted_changed_file_list(
         &self,
         mr_link: &str,
+        path: Option<&str>,
     ) -> Result<Vec<String>, MegaError> {
         let mr = self
             .storage
@@ -600,6 +601,13 @@ impl MonoApiService {
         let file_paths: Vec<String> = sorted_changed_files
             .iter()
             .map(|f| f.path().to_string_lossy().to_string())
+            .filter(|file_path| {
+                if let Some(prefix) = path {
+                    file_path.starts_with(prefix)
+                } else {
+                    true
+                }
+            })
             .collect();
 
         Ok(file_paths)
@@ -965,6 +973,53 @@ mod test {
         assert_eq!(old_blobs[0].0, PathBuf::from("deleted_file.txt"));
     }
 
+    #[test]
+    fn test_file_lists_with_roots() {
+        let all_files = vec![
+            "src/main.rs".to_string(),
+            "src/utils/math.rs".to_string(),
+            "src/utils/io.rs".to_string(),
+            "README.md".to_string(),
+        ];
+
+        let root: Option<&str> = None;
+        let filtered_none: Vec<String> = all_files
+            .iter()
+            .filter(|file_path| {
+                if let Some(prefix) = root {
+                    file_path.starts_with(prefix)
+                } else {
+                    true
+                }
+            })
+            .cloned()
+            .collect();
+
+        assert_eq!(filtered_none.len(), 4);
+        assert_eq!(filtered_none, all_files);
+
+        let filtered_some: Vec<String> = all_files
+            .iter()
+            .filter(|file_path| {
+                if let Some(prefix) = Some("src/utils") {
+                    file_path.starts_with(prefix)
+                } else {
+                    true
+                }
+            })
+            .cloned()
+            .collect();
+
+        assert_eq!(filtered_some.len(), 2);
+        assert_eq!(
+            filtered_some,
+            vec![
+                "src/utils/math.rs".to_string(),
+                "src/utils/io.rs".to_string()
+            ]
+        );
+    }
+
     #[test]
     fn test_collect_page_blobs_modified_files() {
         let service = MonoApiService {
diff --git a/ceres/src/merge_checker/gpg_signature_checker.rs b/ceres/src/merge_checker/gpg_signature_checker.rs
index ff0c81b5b..5d6223a57 100644
--- a/ceres/src/merge_checker/gpg_signature_checker.rs
+++ b/ceres/src/merge_checker/gpg_signature_checker.rs
@@ -43,7 +43,7 @@ impl Checker for GpgSignatureChecker {
             }
 
             Err(e) => {
-                res.status = ConditionResult::PASSED;
+                res.status = ConditionResult::FAILED;
                 res.message = format!("Error during GPG signature verification: {e}");
             }
         };
diff --git a/mono/src/api/mr/model.rs b/mono/src/api/mr/model.rs
index 902cc23bf..d3f663af0 100644
--- a/mono/src/api/mr/model.rs
+++ b/mono/src/api/mr/model.rs
@@ -29,3 +29,4 @@ pub struct ReviewerInfo {
     pub username: String,
     pub approved: bool,
 }
+
diff --git a/mono/src/api/mr/mr_router.rs b/mono/src/api/mr/mr_router.rs
index 91ea9fce3..9e40108b9 100644
--- a/mono/src/api/mr/mr_router.rs
+++ b/mono/src/api/mr/mr_router.rs
@@ -1,10 +1,11 @@
 use std::path::PathBuf;
 
 use axum::{
-    extract::{Path, State},
+    extract::{Path, Query, State},
     Json,
 };
 use callisto::sea_orm_active_enums::{ConvTypeEnum, MergeStatusEnum};
+use ceres::model::git::TreeQuery;
 use common::{
     errors::MegaError,
     model::{CommonPage, CommonResult, PageParams},
@@ -13,8 +14,7 @@ use jupiter::service::mr_service::MRService;
 use utoipa_axum::{router::OpenApiRouter, routes};
 
 use crate::api::mr::model::{
-    ChangeReviewStatePayload, ChangeReviewerStatePayload, ReviewerInfo, ReviewerPayload,
-    ReviewersResponse,
+    ChangeReviewStatePayload, ChangeReviewerStatePayload, ReviewerInfo, ReviewerPayload, ReviewersResponse
 };
 use crate::api::{
     api_common::{
@@ -271,6 +271,7 @@ async fn mr_detail(
     get,
     params(
         ("link", description = "MR link"),
+        TreeQuery,
     ),
     path = "/{link}/mui-tree",
     responses(
@@ -280,9 +281,12 @@ async fn mr_detail(
 )]
 async fn mr_mui_tree(
     Path(link): Path<String>,
+    Query(query): Query<TreeQuery>,
     state: State<MonoApiServiceState>,
 ) -> Result<Json<CommonResult<Vec<MuiTreeNode>>>, ApiError> {
-    let files = state.monorepo().get_sorted_changed_file_list(&link).await?;
+    let path = query.path.clone();
+
+    let files = state.monorepo().get_sorted_changed_file_list(&link, Some(&path)).await?;
     let mui_trees = build_forest(files);
     Ok(Json(CommonResult::success(Some(mui_trees))))
 }