refactor: move ListDatabases output schema to tool file and remove validations from UI

Author: tsck

src/schemas/listDatabases.ts

@@ -3,9 +3,24 @@ import { MongoDBToolBase } from "../mongodbTool.js";
 import type * as bson from "bson";
 import type { OperationType } from "../../tool.js";
 import { formatUntrustedData } from "../../tool.js";
-import { ListDatabasesOutputSchema, type ListDatabasesOutput } from "../../../schemas/listDatabases.js";
+import { z } from "zod";
 
-export { ListDatabasesOutputSchema, type ListDatabasesOutput };
+/**
+ * Schema for the list-databases tool output.
+ * Used by the MCP protocol for structured content validation.
+ */
+export const ListDatabasesOutputSchema = {
+    databases: z.array(
+        z.object({
+            name: z.string(),
+            size: z.number(),
+        })
+    ),
+    totalCount: z.number(),
+};
+
+/** Type derived from the output schema */
+export type ListDatabasesOutput = z.infer<z.ZodObject<typeof ListDatabasesOutputSchema>>;
 
 export class ListDatabasesTool extends MongoDBToolBase {
     public name = "list-databases";

src/tools/mongodb/metadata/listDatabases.ts

@@ -1,5 +1,4 @@
 import React from "react";
-import { z } from "zod";
 import { useRenderData } from "../../hooks/index.js";
 import {
     Cell as LGCell,
@@ -11,14 +10,12 @@ import {
     TableHead,
 } from "@leafygreen-ui/table";
 import { tableStyles } from "./ListDatabases.styles.js";
-import { ListDatabasesOutputSchema, type ListDatabasesOutput } from "../../../schemas/listDatabases.js";
+import type { ListDatabasesOutput } from "../../../tools/mongodb/metadata/listDatabases.js";
 
 const HeaderCell = LGHeaderCell as React.FC<React.ComponentPropsWithoutRef<"th">>;
 const Cell = LGCell as React.FC<React.ComponentPropsWithoutRef<"td">>;
 const Row = LGRow as React.FC<React.ComponentPropsWithoutRef<"tr">>;
 
-const ListDatabasesDataSchema = z.object(ListDatabasesOutputSchema);
-
 function formatBytes(bytes: number): string {
     if (bytes === 0) return "0 Bytes";
 
@@ -40,10 +37,7 @@ export const ListDatabases = (): React.ReactElement | null => {
         return <div>Error: {error}</div>;
     }
 
-    const validationResult = ListDatabasesDataSchema.safeParse(data);
-
-    if (!validationResult.success) {
-        console.error("[ListDatabases] Validation error:", validationResult.error);
+    if (!data) {
         return null;
     }