Add enum parameter support in ToolsTab component and corresponding tests

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

client/src/components/ToolsTab.tsx

@@ -5,6 +5,13 @@ import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { TabsContent } from "@/components/ui/tabs";
 import { Textarea } from "@/components/ui/textarea";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
 import DynamicJsonForm, { DynamicJsonFormRef } from "./DynamicJsonForm";
 import type { JsonValue, JsonSchemaType } from "@/utils/jsonUtils";
 import {
@@ -180,6 +187,42 @@ const ToolsTab = ({
                               {prop.description || "Toggle this option"}
                             </label>
                           </div>
+                        ) : prop.type === "string" && prop.enum ? (
+                          <Select
+                            value={
+                              params[key] === undefined
+                                ? ""
+                                : String(params[key])
+                            }
+                            onValueChange={(value) => {
+                              if (value === "") {
+                                setParams({
+                                  ...params,
+                                  [key]: undefined,
+                                });
+                              } else {
+                                setParams({
+                                  ...params,
+                                  [key]: value,
+                                });
+                              }
+                            }}
+                          >
+                            <SelectTrigger id={key} className="mt-1">
+                              <SelectValue
+                                placeholder={
+                                  prop.description || "Select an option"
+                                }
+                              />
+                            </SelectTrigger>
+                            <SelectContent>
+                              {prop.enum.map((option) => (
+                                <SelectItem key={option} value={option}>
+                                  {option}
+                                </SelectItem>
+                              ))}
+                            </SelectContent>
+                          </Select>
                         ) : prop.type === "string" ? (
                           <Textarea
                             id={key}

client/src/components/__tests__/ToolsTab.test.tsx

@@ -638,6 +638,64 @@ describe("ToolsTab", () => {
     });
   });
 
+  describe("Enum Parameters", () => {
+    const toolWithEnumParam: Tool = {
+      name: "enumTool",
+      description: "Tool with enum parameter",
+      inputSchema: {
+        type: "object" as const,
+        properties: {
+          format: {
+            type: "string" as const,
+            enum: ["json", "xml", "csv", "yaml"],
+            description: "Output format",
+          },
+        },
+      },
+    };
+
+    beforeEach(() => {
+      // Mock scrollIntoView for Radix UI Select
+      Element.prototype.scrollIntoView = jest.fn();
+    });
+
+    it("should render enum parameter as dropdown", () => {
+      renderToolsTab({
+        tools: [toolWithEnumParam],
+        selectedTool: toolWithEnumParam,
+      });
+
+      // Should render a select button instead of textarea
+      const selectTrigger = screen.getByRole("combobox", { name: /format/i });
+      expect(selectTrigger).toBeInTheDocument();
+    });
+
+    it("should render non-enum string parameter as textarea", () => {
+      const toolWithStringParam: Tool = {
+        name: "stringTool",
+        description: "Tool with regular string parameter",
+        inputSchema: {
+          type: "object" as const,
+          properties: {
+            text: {
+              type: "string" as const,
+              description: "Some text input",
+            },
+          },
+        },
+      };
+
+      renderToolsTab({
+        tools: [toolWithStringParam],
+        selectedTool: toolWithStringParam,
+      });
+
+      // Should render textarea, not select
+      expect(screen.queryByRole("combobox")).not.toBeInTheDocument();
+      expect(screen.getByRole("textbox")).toBeInTheDocument();
+    });
+  });
+
   describe("JSON Validation Integration", () => {
     const toolWithJsonParams: Tool = {
       name: "jsonTool",