feat: add codex image tool (#650)

src/tools/impl/ViewImage.ts

@@ -0,0 +1,39 @@
+import * as path from "node:path";
+import { read, type ToolReturnContent } from "./Read";
+import { validateRequiredParams } from "./validation.js";
+
+interface ViewImageArgs {
+  path: string;
+}
+
+const IMAGE_EXTENSIONS = new Set([
+  ".png",
+  ".jpg",
+  ".jpeg",
+  ".gif",
+  ".webp",
+  ".bmp",
+]);
+
+function isImageFile(filePath: string): boolean {
+  const ext = path.extname(filePath).toLowerCase();
+  return IMAGE_EXTENSIONS.has(ext);
+}
+
+export async function view_image(
+  args: ViewImageArgs,
+): Promise<{ content: ToolReturnContent }> {
+  validateRequiredParams(args, ["path"], "view_image");
+
+  const userCwd = process.env.USER_CWD || process.cwd();
+  const resolvedPath = path.isAbsolute(args.path)
+    ? args.path
+    : path.resolve(userCwd, args.path);
+
+  if (!isImageFile(resolvedPath)) {
+    throw new Error(`Unsupported image file type: ${resolvedPath}`);
+  }
+
+  const result = await read({ file_path: resolvedPath });
+  return { content: result.content };
+}