diff --git a/biome.json b/biome.json
index 921a7a5..e51b525 100644
--- a/biome.json
+++ b/biome.json
@@ -20,7 +20,12 @@
 	"linter": {
 		"enabled": true,
 		"rules": {
-			"recommended": true
+			"recommended": true,
+			"correctness": {
+				"noUnusedVariables": "error",
+				"noUnusedImports": "error",
+				"noUnusedFunctionParameters": "error"
+			}
 		}
 	},
 	"javascript": {
diff --git a/src/routes/guild/[id]/delete.ts b/src/routes/guild/[id]/delete.ts
index 2c801df..7e67889 100644
--- a/src/routes/guild/[id]/delete.ts
+++ b/src/routes/guild/[id]/delete.ts
@@ -82,6 +82,8 @@ async function handler(request: ExtendedRequest): Promise<Response> {
 			data: { id: guildId, name: row.name },
 		});
 	} catch (error) {
+		logger.error(["Failed to delete guild", error as Error]);
+
 		return jsonResponse(500, {
 			message: "Internal server error",
 			error: "Failed to delete guild",
diff --git a/src/routes/guild/[id]/invite/create.ts b/src/routes/guild/[id]/invite/create.ts
index a638610..0267588 100644
--- a/src/routes/guild/[id]/invite/create.ts
+++ b/src/routes/guild/[id]/invite/create.ts
@@ -100,6 +100,8 @@ async function handler(
 			},
 		});
 	} catch (error) {
+		logger.error(["Failed to create guild invite", error as Error]);
+
 		return jsonResponse(500, {
 			message: "Internal server error",
 			error: "Failed to create invite",
diff --git a/src/routes/guild/create.ts b/src/routes/guild/create.ts
index d6dc38c..6947641 100644
--- a/src/routes/guild/create.ts
+++ b/src/routes/guild/create.ts
@@ -94,6 +94,8 @@ async function handler(
 			},
 		});
 	} catch (error) {
+		logger.error(["Failed to create guild", error as Error]);
+
 		return jsonResponse(500, {
 			message: "Internal server error",
 			error: "Failed to create guild",
diff --git a/src/routes/user/register.ts b/src/routes/user/register.ts
index dc7e23e..a2eeb91 100644
--- a/src/routes/user/register.ts
+++ b/src/routes/user/register.ts
@@ -118,6 +118,8 @@ async function handler(
 			"34",
 		);
 	} catch (error) {
+		logger.error(["User registration error", error as Error]);
+
 		return jsonResponse(500, {
 			message: "Internal server error",
 			error: "Failed to register user",
diff --git a/src/websocket.ts b/src/websocket.ts
index 7b65476..12f7056 100644
--- a/src/websocket.ts
+++ b/src/websocket.ts
@@ -20,7 +20,7 @@ class WebSocketHandler {
 		}
 	}
 
-	public handleClose(ws: ServerWebSocket, code: number, reason: string): void {
+	public handleClose(_ws: ServerWebSocket, code: number, reason: string): void {
 		logger.warn(`WebSocket closed with code ${code}, reason: ${reason}`);
 	}
 }