Q65: every call path records real tokens, cache, reasoning and cost

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/stream-usage-request.test.ts

@@ -0,0 +1,32 @@
+import { afterEach, describe, expect, test, vi } from "vitest";
+import { providerAdapters } from "../../src/main/services/provider-adapters";
+import { makeChatCompletionsTurn } from "../../src/main/services/provider-tool-turns/turns";
+
+const bodies: Array<Record<string, unknown>> = [];
+
+function sseResponse(): Response {
+  const text = "data: {\"choices\":[{\"delta\":{\"content\":\"ok\"},\"finish_reason\":\"stop\"}]}\n\ndata: [DONE]\n\n";
+  return new Response(text, { status: 200, headers: { "content-type": "text/event-stream" } });
+}
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  bodies.length = 0;
+});
+
+describe("stream usage requests", () => {
+  test("xAI and Groq streams ask for token usage; Mistral and Cerebras streams do not", async () => {
+    vi.stubGlobal("fetch", async (_url: string, init: RequestInit) => {
+      bodies.push(JSON.parse(String(init.body)) as Record<string, unknown>);
+      return sseResponse();
+    });
+    for (const key of ["xai", "groq", "mistral", "cerebras"] as const) {
+      const result = await providerAdapters[key].streamResponse({ authProfile: { type: "api_key", apiKey: "k" }, model: "m", prompt: "p", instructions: null });
+      for await (const event of result.events) void event;
+    }
+    expect(bodies.map((body) => body.stream_options ?? null)).toEqual([{ include_usage: true }, { include_usage: true }, null, null]);
+
+    await makeChatCompletionsTurn("https://api.x.ai/v1/chat/completions", "xAI", true)({ credential: { apiKey: "k" }, model: "m", instructions: null, messages: [{ role: "user", text: "hi" }], tools: [] });
+    expect(bodies.at(-1)?.stream_options).toEqual({ include_usage: true });
+  });
+});