Function rpc

apps/host-cloudflare/src/worker.e2e.node.test.ts:199–208

(sessionId: string | null, body: unknown)

    // follow-up back to the same isolate, so the tool list comes through.
    const accept = "application/json, text/event-stream";
    const rpc = (sessionId: string | null, body: unknown) =>
      worker.fetch("/mcp", {
        method: "POST",
        headers: {
          "content-type": "application/json",
          accept,
          ...(sessionId ? { "mcp-session-id": sessionId } : {}),
        },
        body: JSON.stringify(body),
      });

    const init = await rpc(null, {
      jsonrpc: "2.0",