fix: Trim whitespace from app_target parameter

- Add .trim() to app_target when passing to Swift CLI
- Handles cases like "   Spotify   " correctly matching "Spotify"
- Applies to all app name formats including window specifiers

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

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

src/utils/image-cli-args.ts

@@ -96,7 +96,7 @@ export function buildSwiftCliArgs(
       const specifierType = parts[1];
       const specifierValue = parts.slice(2).join(":"); // Handle colons in window titles
 
-      args.push("--app", appName);
+      args.push("--app", appName.trim());
       args.push("--mode", "window");
 
       if (specifierType === "WINDOW_TITLE") {
@@ -115,12 +115,12 @@ export function buildSwiftCliArgs(
         { app_target: input.app_target },
         "Malformed window specifier, treating as app name",
       );
-      args.push("--app", input.app_target);
+      args.push("--app", input.app_target.trim());
       args.push("--mode", "multi");
     }
   } else {
     // 'AppName': All windows of that app
-    args.push("--app", input.app_target);
+    args.push("--app", input.app_target.trim());
     args.push("--mode", "multi");
   }
 

tests/unit/tools/image.test.ts

@@ -317,6 +317,64 @@ describe("Image Tool", () => {
       );
     });
 
+    it("should handle case-insensitive format values", async () => {
+      // Import schema to test preprocessing
+      const { imageToolSchema } = await import("../../../src/types/index.js");
+      
+      // Mock resolveImagePath for minimal case
+      mockResolveImagePath.mockResolvedValue({
+        effectivePath: "/tmp/test.png",
+        tempDirUsed: undefined,
+      });
+      
+      const mockResponse = mockSwiftCli.captureImage("screen", {
+        path: "/tmp/test.png",
+        format: "png",
+      });
+      mockExecuteSwiftCli.mockResolvedValue(mockResponse);
+
+      // Test uppercase PNG - parse through schema first
+      const parsedInput = imageToolSchema.parse({ format: "PNG", path: "/tmp/test.png" });
+      await imageToolHandler(
+        parsedInput,
+        mockContext,
+      );
+
+      expect(mockExecuteSwiftCli).toHaveBeenCalledWith(
+        expect.arrayContaining(["--format", "png"]),
+        mockLogger,
+      );
+    });
+
+    it("should handle jpeg alias for jpg format", async () => {
+      // Import schema to test preprocessing
+      const { imageToolSchema } = await import("../../../src/types/index.js");
+      
+      // Mock resolveImagePath for minimal case
+      mockResolveImagePath.mockResolvedValue({
+        effectivePath: "/tmp/test.jpg",
+        tempDirUsed: undefined,
+      });
+      
+      const mockResponse = mockSwiftCli.captureImage("screen", {
+        path: "/tmp/test.jpg",
+        format: "jpg",
+      });
+      mockExecuteSwiftCli.mockResolvedValue(mockResponse);
+
+      // Test jpeg alias - parse through schema first
+      const parsedInput = imageToolSchema.parse({ format: "jpeg", path: "/tmp/test.jpg" });
+      await imageToolHandler(
+        parsedInput,
+        mockContext,
+      );
+
+      expect(mockExecuteSwiftCli).toHaveBeenCalledWith(
+        expect.arrayContaining(["--format", "jpg"]),
+        mockLogger,
+      );
+    });
+
     it("should handle app_target: 'frontmost' with warning", async () => {
       // Mock resolveImagePath for minimal case
       mockResolveImagePath.mockResolvedValue({
@@ -1116,6 +1174,9 @@ describe("Image Tool", () => {
     });
 
     it("should fall back to PNG when format is an invalid value", async () => {
+      // Import schema to test preprocessing
+      const { imageToolSchema } = await import("../../../src/types/index.js");
+      
       // Mock resolveImagePath
       mockResolveImagePath.mockResolvedValue({
         effectivePath: MOCK_TEMP_IMAGE_DIR,
@@ -1129,8 +1190,9 @@ describe("Image Tool", () => {
       mockExecuteSwiftCli.mockResolvedValue(mockResponse);
 
       // Test with invalid format - schema should preprocess to 'png'
+      const parsedInput = imageToolSchema.parse({ format: "invalid" });
       const result = await imageToolHandler(
-        { format: "invalid" as any },
+        parsedInput,
         mockContext,
       );
 
@@ -1200,4 +1262,29 @@ describe("Image Tool", () => {
       expect(result.content[0].text).toBe("Image capture failed: Application not found");
     });
   });
+
+  describe("imageToolHandler - Whitespace trimming", () => {
+    it("should trim leading and trailing whitespace from app_target", async () => {
+      mockResolveImagePath.mockResolvedValue({
+        effectivePath: MOCK_TEMP_IMAGE_DIR,
+        tempDirUsed: MOCK_TEMP_IMAGE_DIR,
+      });
+      
+      const mockResponse = mockSwiftCli.captureImage("Spotify", {
+        path: MOCK_SAVED_FILE_PATH,
+        format: "png",
+      });
+      mockExecuteSwiftCli.mockResolvedValue(mockResponse);
+
+      await imageToolHandler(
+        { app_target: "   Spotify   " },
+        mockContext,
+      );
+
+      // Check that the Swift CLI was called with trimmed app name
+      const callArgs = mockExecuteSwiftCli.mock.calls[0][0];
+      const appIndex = callArgs.indexOf("--app");
+      expect(callArgs[appIndex + 1]).toBe("Spotify"); // Should be trimmed
+    });
+  });
 });