Fix MCP server search in playground (#22824)

- Added showSearch prop to enable search input in MCP server selector
- Added filterOption to search across server name, alias, server_id, and description
- Search is case-insensitive and filters in real-time
- Added test to verify search input appears when dropdown opens
- Updated tsconfig.json with Next.js auto-configuration (jsx: react-jsx)

Fixes issue where MCP server search was not working in the playground.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Ishaan Jaff <ishaan-jaff@users.noreply.github.com>

ui/litellm-dashboard/src/components/playground/chat_ui/ChatUI.test.tsx

@@ -373,4 +373,43 @@ describe("ChatUI", () => {
     const customProxyInput = screen.getByPlaceholderText("Optional: Enter custom proxy URL (e.g., http://localhost:5000)");
     expect(customProxyInput).toHaveValue(testProxyUrl);
   });
+
+  it("should enable search functionality for MCP server selector", async () => {
+    render(
+      <ChatUI
+        accessToken="1234567890"
+        token="1234567890"
+        userRole="user"
+        userID="1234567890"
+        disabledPersonalKeyCreation={false}
+      />
+    );
+
+    await waitFor(() => {
+      expect(screen.getByText("Test Key")).toBeInTheDocument();
+    });
+
+    const mcpServersText = screen.queryByText("MCP Servers");
+    expect(mcpServersText).toBeInTheDocument();
+
+    if (mcpServersText) {
+      const selectContainer = mcpServersText.parentElement?.nextElementSibling;
+      const selectElement = selectContainer?.querySelector(".ant-select-selector");
+      expect(selectElement).toBeInTheDocument();
+
+      if (selectElement) {
+        fireEvent.mouseDown(selectElement);
+
+        await waitFor(() => {
+          const allServersOption = screen.queryByText("All MCP Servers");
+          if (allServersOption) {
+            expect(allServersOption).toBeInTheDocument();
+          }
+        });
+
+        const searchInput = document.querySelector(".ant-select-selection-search-input");
+        expect(searchInput).toBeInTheDocument();
+      }
+    }
+  });
 });

ui/litellm-dashboard/src/components/playground/chat_ui/ChatUI.tsx

@@ -1636,9 +1636,27 @@ const ChatUI: React.FC<ChatUIProps> = ({
                   loading={isLoadingMCPServers}
                   className="mb-2"
                   allowClear
+                  showSearch
                   optionLabelProp="label"
                   disabled={!MCP_SUPPORTED_ENDPOINTS.has(endpointType as EndpointType)}
                   maxTagCount={endpointType === EndpointType.MCP ? 1 : "responsive"}
+                  filterOption={(input, option) => {
+                    if (option?.value === "__all__") {
+                      return "All MCP Servers".toLowerCase().includes(input.toLowerCase());
+                    }
+                    const server = mcpServers.find((s) => s.server_id === option?.value);
+                    if (!server) return false;
+                    const searchText = [
+                      server.server_name,
+                      server.alias,
+                      server.server_id,
+                      server.description,
+                    ]
+                      .filter(Boolean)
+                      .join(" ")
+                      .toLowerCase();
+                    return searchText.includes(input.toLowerCase());
+                  }}
                 >
                   {/* All MCP Servers option - hidden for MCP direct mode */}
                   {endpointType !== EndpointType.MCP && (

ui/litellm-dashboard/tsconfig.json

@@ -14,7 +14,7 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "incremental": true,
     "plugins": [
       {