@@ -2377,6 +2377,87 @@ describe("openai transport stream", () => {
23772377}
23782378});
237923792380+it("keeps distinct overlong Copilot Responses replay item ids distinct", () => {
2381+const sharedToolItemPrefix = "iVec" + "A".repeat(160);
2382+const firstToolCallId = `call_first|${sharedToolItemPrefix}Aa`;
2383+const secondToolCallId = `call_second|${sharedToolItemPrefix}BB`;
2384+const params = buildOpenAIResponsesParams(
2385+{
2386+id: "gpt-5.5",
2387+name: "GPT-5.5",
2388+api: "openai-responses",
2389+provider: "github-copilot",
2390+baseUrl: "https://api.githubcopilot.com",
2391+reasoning: true,
2392+input: ["text"],
2393+cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
2394+contextWindow: 200000,
2395+maxTokens: 8192,
2396+} satisfies Model<"openai-responses">,
2397+{
2398+systemPrompt: "system",
2399+messages: [
2400+{
2401+role: "assistant",
2402+api: "openai-responses",
2403+provider: "github-copilot",
2404+model: "gpt-5.5",
2405+usage: {
2406+input: 0,
2407+output: 0,
2408+cacheRead: 0,
2409+cacheWrite: 0,
2410+totalTokens: 0,
2411+cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
2412+},
2413+stopReason: "toolUse",
2414+timestamp: 1,
2415+content: [
2416+{ type: "toolCall", id: firstToolCallId, name: "read", arguments: { path: "a" } },
2417+{ type: "toolCall", id: secondToolCallId, name: "read", arguments: { path: "b" } },
2418+],
2419+},
2420+{
2421+role: "toolResult",
2422+toolCallId: firstToolCallId,
2423+toolName: "read",
2424+content: [{ type: "text", text: "a" }],
2425+isError: false,
2426+timestamp: 2,
2427+},
2428+{
2429+role: "toolResult",
2430+toolCallId: secondToolCallId,
2431+toolName: "read",
2432+content: [{ type: "text", text: "b" }],
2433+isError: false,
2434+timestamp: 3,
2435+},
2436+{ role: "user", content: "continue", timestamp: 4 },
2437+],
2438+tools: [],
2439+} as never,
2440+{ sessionId: "session-123" },
2441+) as {
2442+input?: Array<{ type?: string; id?: string; call_id?: string }>;
2443+};
2444+2445+const functionCalls = params.input?.filter((item) => item.type === "function_call") ?? [];
2446+const functionOutputs =
2447+params.input?.filter((item) => item.type === "function_call_output") ?? [];
2448+expect(functionCalls).toHaveLength(2);
2449+expect(functionOutputs).toHaveLength(2);
2450+expect(functionCalls.map((item) => item.id)).toEqual([
2451+expect.stringMatching(/^fc_/),
2452+expect.stringMatching(/^fc_/),
2453+]);
2454+expect(new Set(functionCalls.map((item) => item.id)).size).toBe(2);
2455+for (const item of functionCalls) {
2456+expect(item.id?.length).toBeLessThanOrEqual(64);
2457+}
2458+expect(functionOutputs.map((item) => item.call_id)).toEqual(["call_first", "call_second"]);
2459+});
2460+23802461it("adds minimal user input for Codex responses when only the system prompt is present", () => {
23812462const params = buildOpenAIResponsesParams(
23822463{
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