diff --git a/apps/app/src/lib/__tests__/agent-url-regression.test.ts b/apps/app/src/lib/__tests__/agent-url-regression.test.ts
new file mode 100644
index 0000000..d5a59f4
--- /dev/null
+++ b/apps/app/src/lib/__tests__/agent-url-regression.test.ts
@@ -0,0 +1,3 @@
+import { it, expect } from "vitest";
+import { normalizeLanggraphUrl } from "../copilotkit-runtime-options";
+it.each([["   ","http://localhost:8123"],[" https://agent.example.com/ ","https://agent.example.com/"],[" agent:8123 ","http://agent:8123"],["HTTPS://agent.example.com","HTTPS://agent.example.com"]])("normalizes deployment URL %s", (raw,expected) => expect(normalizeLanggraphUrl(raw)).toBe(expected));
diff --git a/apps/app/src/lib/copilotkit-runtime-options.ts b/apps/app/src/lib/copilotkit-runtime-options.ts
index 0e34681..73515b8 100644
--- a/apps/app/src/lib/copilotkit-runtime-options.ts
+++ b/apps/app/src/lib/copilotkit-runtime-options.ts
@@ -17,8 +17,9 @@ export interface RuntimeOptionsEnv {
 
 // Normalize Render's fromService hostport (bare host:port) into a full URL
 export function normalizeLanggraphUrl(raw?: string): string {
-  if (!raw) return "http://localhost:8123";
-  return raw.startsWith("http") ? raw : `http://${raw}`;
+  const value = raw?.trim();
+  if (!value) return "http://localhost:8123";
+  return /^https?:\/\//i.test(value) ? value : `http://${value}`;
 }
 
 export function buildRuntimeOptions(env: RuntimeOptionsEnv) {