diff --git a/src/models.rs b/src/models.rs
index 2015379..91e999d 100644
--- a/src/models.rs
+++ b/src/models.rs
@@ -1023,4 +1023,102 @@ impl From<IgnoredFile> for IgnoredFileResponse {
             created_at: ignored_file.created_at,
         }
     }
+}
+
+// Additional response schemas for better API documentation
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct DocumentListResponse {
+    /// List of documents
+    pub documents: Vec<DocumentResponse>,
+    /// Total number of documents (without pagination)
+    pub total: i64,
+    /// Number of documents returned in this response
+    pub count: i64,
+    /// Pagination offset used
+    pub offset: i64,
+    /// Pagination limit used
+    pub limit: i64,
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct DocumentOcrResponse {
+    /// Document ID
+    pub document_id: Uuid,
+    /// Original filename
+    pub filename: String,
+    /// Whether the document has OCR text available
+    pub has_ocr_text: bool,
+    /// OCR text content (if available)
+    pub ocr_text: Option<String>,
+    /// OCR processing confidence score (0-100)
+    pub ocr_confidence: Option<f32>,
+    /// Current OCR processing status
+    pub ocr_status: Option<String>,
+    /// Time taken for OCR processing in milliseconds
+    pub ocr_processing_time_ms: Option<i32>,
+    /// Language detected in the document
+    pub detected_language: Option<String>,
+    /// Number of pages processed (for multi-page documents)
+    pub pages_processed: Option<i32>,
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct DocumentOperationResponse {
+    /// Whether the operation was successful
+    pub success: bool,
+    /// Human-readable message describing the result
+    pub message: String,
+    /// Document ID(s) affected by the operation
+    pub document_ids: Vec<Uuid>,
+    /// Number of documents processed
+    pub count: i64,
+    /// Any warnings or additional information
+    pub warnings: Vec<String>,
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct BulkDeleteResponse {
+    /// Whether the operation was successful
+    pub success: bool,
+    /// Number of documents successfully deleted
+    pub deleted_count: i64,
+    /// Number of documents that failed to delete
+    pub failed_count: i64,
+    /// List of document IDs that were successfully deleted
+    pub deleted_documents: Vec<Uuid>,
+    /// List of document IDs that failed to delete
+    pub failed_documents: Vec<Uuid>,
+    /// Number of files successfully deleted from storage
+    pub files_deleted: i64,
+    /// Number of files that failed to delete from storage
+    pub files_failed: i64,
+    /// Any warnings or additional information
+    pub warnings: Vec<String>,
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct PaginationInfo {
+    /// Total number of items available
+    pub total: i64,
+    /// Number of items returned in current response
+    pub count: i64,
+    /// Current offset
+    pub offset: i64,
+    /// Current limit
+    pub limit: i64,
+    /// Whether there are more items available
+    pub has_more: bool,
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct DocumentDuplicatesResponse {
+    /// List of document groups that are duplicates of each other
+    pub duplicate_groups: Vec<Vec<DocumentResponse>>,
+    /// Total number of duplicate documents found
+    pub total_duplicates: i64,
+    /// Number of duplicate groups
+    pub group_count: i64,
+    /// Pagination information
+    pub pagination: PaginationInfo,
 }
\ No newline at end of file
diff --git a/src/routes/auth.rs b/src/routes/auth.rs
index a485efb..c41a746 100644
--- a/src/routes/auth.rs
+++ b/src/routes/auth.rs
@@ -27,7 +27,8 @@ pub fn router() -> Router<Arc<AppState>> {
     request_body = CreateUser,
     responses(
         (status = 200, description = "User registered successfully", body = UserResponse),
-        (status = 400, description = "Bad request - invalid user data")
+        (status = 400, description = "Bad request - username/email already exists or invalid data"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn register(
@@ -71,7 +72,8 @@ async fn register(
     request_body = LoginRequest,
     responses(
         (status = 200, description = "Login successful", body = LoginResponse),
-        (status = 401, description = "Unauthorized - invalid credentials")
+        (status = 401, description = "Unauthorized - invalid credentials"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn login(
@@ -110,7 +112,8 @@ async fn login(
     ),
     responses(
         (status = 200, description = "Current user information", body = UserResponse),
-        (status = 401, description = "Unauthorized - invalid or missing token")
+        (status = 401, description = "Unauthorized - invalid or missing token"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn me(auth_user: AuthUser) -> Json<UserResponse> {
diff --git a/src/routes/ignored_files.rs b/src/routes/ignored_files.rs
index abb04e2..e3ac73e 100644
--- a/src/routes/ignored_files.rs
+++ b/src/routes/ignored_files.rs
@@ -83,7 +83,8 @@ pub fn ignored_files_routes() -> Router<Arc<AppState>> {
     params(IgnoredFilesQuery),
     responses(
         (status = 200, description = "List of ignored files", body = Vec<IgnoredFileResponse>),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 pub async fn list_ignored_files(
@@ -133,8 +134,9 @@ pub async fn list_ignored_files(
     ),
     responses(
         (status = 200, description = "Ignored file details", body = IgnoredFileResponse),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Ignored file not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 pub async fn get_ignored_file(
@@ -169,8 +171,9 @@ pub async fn get_ignored_file(
     ),
     responses(
         (status = 200, description = "Ignored file deleted successfully"),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Ignored file not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 pub async fn delete_ignored_file(
@@ -211,7 +214,8 @@ pub async fn delete_ignored_file(
     responses(
         (status = 200, description = "Ignored files deleted successfully"),
         (status = 400, description = "Bad request - no ignored file IDs provided"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 pub async fn bulk_delete_ignored_files(
@@ -262,7 +266,8 @@ pub async fn bulk_delete_ignored_files(
     ),
     responses(
         (status = 200, description = "Ignored files statistics", body = IgnoredFilesStats),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 pub async fn get_ignored_files_stats(
diff --git a/src/routes/metrics.rs b/src/routes/metrics.rs
index fa1916d..feb37ed 100644
--- a/src/routes/metrics.rs
+++ b/src/routes/metrics.rs
@@ -86,6 +86,7 @@ pub fn router() -> Router<Arc<AppState>> {
     responses(
         (status = 200, description = "System metrics and monitoring data", body = SystemMetrics),
         (status = 401, description = "Unauthorized - valid authentication required"),
+        (status = 403, description = "Forbidden - Admin access required"),
         (status = 500, description = "Internal server error")
     )
 )]
diff --git a/src/routes/notifications.rs b/src/routes/notifications.rs
index 4e6efbf..a41a055 100644
--- a/src/routes/notifications.rs
+++ b/src/routes/notifications.rs
@@ -42,7 +42,8 @@ pub fn router() -> Router<Arc<AppState>> {
     ),
     responses(
         (status = 200, description = "List of user notifications", body = Vec<Notification>),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn get_notifications(
@@ -71,7 +72,8 @@ async fn get_notifications(
     ),
     responses(
         (status = 200, description = "Notification summary with unread count and recent notifications", body = NotificationSummary),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn get_notification_summary(
@@ -99,8 +101,9 @@ async fn get_notification_summary(
     ),
     responses(
         (status = 200, description = "Notification marked as read"),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Notification not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn mark_notification_read(
@@ -126,7 +129,8 @@ async fn mark_notification_read(
     ),
     responses(
         (status = 200, description = "All notifications marked as read"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn mark_all_notifications_read(
@@ -154,8 +158,9 @@ async fn mark_all_notifications_read(
     ),
     responses(
         (status = 200, description = "Notification deleted"),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Notification not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn delete_notification(
diff --git a/src/routes/queue.rs b/src/routes/queue.rs
index 3298cba..79fb66c 100644
--- a/src/routes/queue.rs
+++ b/src/routes/queue.rs
@@ -36,6 +36,7 @@ pub fn router() -> Router<Arc<AppState>> {
     responses(
         (status = 200, description = "OCR queue statistics including pending jobs, processing status, and performance metrics"),
         (status = 401, description = "Unauthorized - valid authentication required"),
+        (status = 403, description = "Forbidden - Admin access required"),
         (status = 500, description = "Internal server error")
     )
 )]
@@ -70,7 +71,9 @@ async fn get_queue_stats(
     ),
     responses(
         (status = 200, description = "Failed items requeued successfully"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin access required"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn requeue_failed(
diff --git a/src/routes/search.rs b/src/routes/search.rs
index d153dbc..5d43534 100644
--- a/src/routes/search.rs
+++ b/src/routes/search.rs
@@ -24,6 +24,7 @@ pub fn router() -> Router<Arc<AppState>> {
     get,
     path = "/api/search",
     tag = "search",
+    description = "Search documents with basic relevance ranking and OCR text matching",
     security(
         ("bearer_auth" = [])
     ),
@@ -76,6 +77,7 @@ async fn search_documents(
     get,
     path = "/api/search/enhanced",
     tag = "search",
+    description = "Enhanced search with improved ranking, text snippets, and query suggestions",
     security(
         ("bearer_auth" = [])
     ),
@@ -84,7 +86,8 @@ async fn search_documents(
     ),
     responses(
         (status = 200, description = "Enhanced search results with snippets and suggestions", body = SearchResponse),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn enhanced_search_documents(
@@ -138,12 +141,14 @@ fn generate_search_suggestions(query: &str) -> Vec<String> {
     get,
     path = "/api/search/facets",
     tag = "search",
+    description = "Get available search facets (MIME types, tags) with document counts for filtering",
     security(
         ("bearer_auth" = [])
     ),
     responses(
         (status = 200, description = "Search facets with counts", body = SearchFacetsResponse),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn get_search_facets(
diff --git a/src/routes/settings.rs b/src/routes/settings.rs
index c8b0506..a6457f7 100644
--- a/src/routes/settings.rs
+++ b/src/routes/settings.rs
@@ -27,7 +27,8 @@ pub fn router() -> Router<Arc<AppState>> {
     ),
     responses(
         (status = 200, description = "User settings", body = SettingsResponse),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn get_settings(
@@ -112,7 +113,8 @@ async fn get_settings(
     responses(
         (status = 200, description = "Settings updated successfully", body = SettingsResponse),
         (status = 400, description = "Bad request - invalid settings data"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn update_settings(
diff --git a/src/routes/sources.rs b/src/routes/sources.rs
index 204e57a..18bdf7c 100644
--- a/src/routes/sources.rs
+++ b/src/routes/sources.rs
@@ -36,7 +36,8 @@ pub fn router() -> Router<Arc<AppState>> {
     ),
     responses(
         (status = 200, description = "List of user sources", body = Vec<SourceResponse>),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn list_sources(
@@ -64,7 +65,8 @@ async fn list_sources(
     responses(
         (status = 201, description = "Source created successfully", body = SourceResponse),
         (status = 400, description = "Bad request - invalid source data"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn create_source(
@@ -103,8 +105,9 @@ async fn create_source(
     ),
     responses(
         (status = 200, description = "Source details with stats", body = SourceWithStats),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Source not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn get_source(
@@ -159,9 +162,10 @@ async fn get_source(
     request_body = UpdateSource,
     responses(
         (status = 200, description = "Source updated successfully", body = SourceResponse),
-        (status = 404, description = "Source not found"),
         (status = 400, description = "Bad request - invalid update data"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 404, description = "Source not found"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn update_source(
@@ -214,8 +218,9 @@ async fn update_source(
     ),
     responses(
         (status = 204, description = "Source deleted successfully"),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Source not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn delete_source(
@@ -248,9 +253,11 @@ async fn delete_source(
     ),
     responses(
         (status = 200, description = "Sync triggered successfully"),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Source not found"),
         (status = 409, description = "Source is already syncing"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error"),
+        (status = 501, description = "Not implemented - Source type not supported")
     )
 )]
 async fn trigger_sync(
@@ -341,9 +348,10 @@ async fn trigger_sync(
     ),
     responses(
         (status = 200, description = "Sync stopped successfully"),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Source not found"),
         (status = 409, description = "Source is not currently syncing"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn stop_sync(
@@ -411,8 +419,9 @@ async fn stop_sync(
     ),
     responses(
         (status = 200, description = "Connection test result", body = serde_json::Value),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Source not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn test_connection(
@@ -540,8 +549,9 @@ fn validate_config_for_type(
     ),
     responses(
         (status = 200, description = "Crawl estimate result", body = serde_json::Value),
+        (status = 401, description = "Unauthorized"),
         (status = 404, description = "Source not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn estimate_crawl(
@@ -580,7 +590,8 @@ async fn estimate_crawl(
     responses(
         (status = 200, description = "Crawl estimate result", body = serde_json::Value),
         (status = 400, description = "Bad request - invalid configuration"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn estimate_crawl_with_config(
@@ -652,7 +663,8 @@ struct TestConnectionRequest {
     responses(
         (status = 200, description = "Connection test result", body = serde_json::Value),
         (status = 400, description = "Bad request - invalid configuration"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn test_connection_with_config(
diff --git a/src/routes/users.rs b/src/routes/users.rs
index 9deb20a..c3ce835 100644
--- a/src/routes/users.rs
+++ b/src/routes/users.rs
@@ -37,7 +37,9 @@ pub fn router() -> Router<Arc<AppState>> {
     ),
     responses(
         (status = 200, description = "List of all users", body = Vec<UserResponse>),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin access required"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn list_users(
@@ -67,8 +69,10 @@ async fn list_users(
     ),
     responses(
         (status = 200, description = "User information", body = UserResponse),
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin access required"),
         (status = 404, description = "User not found"),
-        (status = 401, description = "Unauthorized")
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn get_user(
@@ -98,7 +102,9 @@ async fn get_user(
     responses(
         (status = 200, description = "User created successfully", body = UserResponse),
         (status = 400, description = "Bad request - invalid user data"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin access required"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn create_user(
@@ -130,7 +136,9 @@ async fn create_user(
     responses(
         (status = 200, description = "User updated successfully", body = UserResponse),
         (status = 400, description = "Bad request - invalid user data"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin access required"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn update_user(
@@ -161,8 +169,10 @@ async fn update_user(
     ),
     responses(
         (status = 204, description = "User deleted successfully"),
-        (status = 403, description = "Forbidden - cannot delete yourself"),
-        (status = 401, description = "Unauthorized")
+        (status = 401, description = "Unauthorized"),
+        (status = 403, description = "Forbidden - Admin access required or cannot delete yourself"),
+        (status = 404, description = "User not found"),
+        (status = 500, description = "Internal server error")
     )
 )]
 async fn delete_user(
diff --git a/src/swagger.rs b/src/swagger.rs
index 27ac635..77416f7 100644
--- a/src/swagger.rs
+++ b/src/swagger.rs
@@ -13,7 +13,9 @@ use crate::{
         Source, SourceResponse, CreateSource, UpdateSource, SourceWithStats,
         WebDAVSourceConfig, LocalFolderSourceConfig, S3SourceConfig,
         WebDAVCrawlEstimate, WebDAVTestConnection, WebDAVConnectionResult, WebDAVSyncStatus,
-        ProcessedImage, CreateProcessedImage, IgnoredFileResponse, IgnoredFilesQuery
+        ProcessedImage, CreateProcessedImage, IgnoredFileResponse, IgnoredFilesQuery,
+        DocumentListResponse, DocumentOcrResponse, DocumentOperationResponse,
+        BulkDeleteResponse, PaginationInfo, DocumentDuplicatesResponse
     },
     routes::{
         metrics::{
@@ -130,7 +132,8 @@ use crate::{
             // Labels schemas
             Label, CreateLabel, UpdateLabel, LabelAssignment, LabelQuery, LabelBulkUpdateRequest,
             // Document schemas
-            BulkDeleteRequest
+            BulkDeleteRequest, DocumentListResponse, DocumentOcrResponse, DocumentOperationResponse,
+            BulkDeleteResponse, PaginationInfo, DocumentDuplicatesResponse
         )
     ),
     tags(