diff --git a/app/api/chat/__tests__/route.test.ts b/app/api/chat/__tests__/route.test.ts
new file mode 100644
index 000000000..e903c3768
--- /dev/null
+++ b/app/api/chat/__tests__/route.test.ts
@@ -0,0 +1,30 @@
+import { describe, it, expect, vi } from "vitest";
+import { NextRequest } from "next/server";
+
+import { POST, OPTIONS } from "@/app/api/chat/route";
+import { handleChatWorkflowStream } from "@/lib/chat/handleChatWorkflowStream";
+
+vi.mock("@/lib/chat/handleChatWorkflowStream", () => ({
+  handleChatWorkflowStream: vi.fn(async () => new Response("ok", { status: 200 })),
+}));
+
+vi.mock("@/lib/networking/getCorsHeaders", () => ({
+  getCorsHeaders: vi.fn(() => ({ "Access-Control-Allow-Origin": "*" })),
+}));
+
+describe("POST /api/chat route shell", () => {
+  it("delegates to handleChatWorkflowStream (canonical path; alias of /api/chat/workflow)", async () => {
+    const req = new NextRequest("http://localhost/api/chat", { method: "POST" });
+    const res = await POST(req);
+
+    expect(handleChatWorkflowStream).toHaveBeenCalledWith(req);
+    expect(res.status).toBe(200);
+  });
+
+  it("OPTIONS returns 200 with CORS headers", async () => {
+    const res = await OPTIONS();
+
+    expect(res.status).toBe(200);
+    expect(res.headers.get("Access-Control-Allow-Origin")).toBe("*");
+  });
+});
diff --git a/app/api/chat/workflow/route.ts b/app/api/chat/route.ts
similarity index 74%
rename from app/api/chat/workflow/route.ts
rename to app/api/chat/route.ts
index 19445c03b..2df3c5016 100644
--- a/app/api/chat/workflow/route.ts
+++ b/app/api/chat/route.ts
@@ -18,11 +18,12 @@ export async function OPTIONS() {
 }
 
 /**
- * POST /api/chat/workflow
+ * POST /api/chat
  *
- * Streams a sandbox-driven agent loop (Vercel Workflow) for an existing
- * session + chat. Currently returns a hardcoded UIMessage stream stub —
- * the workflow is wired up in a follow-up PR.
+ * Canonical path for the sandbox-driven agent loop (Vercel Workflow).
+ * Delegates to the same handler as `POST /api/chat/workflow`, which is
+ * retained as a backward-compatible alias while consumers (chat,
+ * open-agents, API-key callers) migrate to `/api/chat`.
  *
  * Contract: https://developers.recoupable.com/api-reference/chat/workflow
  *