Add standalone Paperclip MCP server package

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/mcp-server/src/format.ts

@@ -0,0 +1,31 @@
+import { PaperclipApiError } from "./client.js";
+
+type McpTextResponse = {
+  content: Array<{ type: "text"; text: string }>;
+};
+
+export function formatTextResponse(value: unknown): McpTextResponse {
+  return {
+    content: [
+      {
+        type: "text",
+        text: typeof value === "string" ? value : JSON.stringify(value, null, 2),
+      },
+    ],
+  };
+}
+
+export function formatErrorResponse(error: unknown): McpTextResponse {
+  if (error instanceof PaperclipApiError) {
+    return formatTextResponse({
+      error: error.message,
+      status: error.status,
+      method: error.method,
+      path: error.path,
+      body: error.body,
+    });
+  }
+  return formatTextResponse({
+    error: error instanceof Error ? error.message : String(error),
+  });
+}