test: add gemini 3 antigravity switch live repro

src/agents/google-gemini-switch.live.test.ts

@@ -0,0 +1,83 @@
+import { completeSimple, getModel } from "@mariozechner/pi-ai";
+import { describe, expect, it } from "vitest";
+
+const GEMINI_KEY = process.env.GEMINI_API_KEY ?? "";
+const LIVE =
+  process.env.GEMINI_LIVE_TEST === "1" || process.env.LIVE === "1";
+
+const describeLive = LIVE && GEMINI_KEY ? describe : describe.skip;
+
+describeLive("gemini live switch", () => {
+  it(
+    "handles unsigned tool calls from Antigravity when switching to Gemini 3",
+    async () => {
+      const now = Date.now();
+      const model = getModel("google", "gemini-3-pro-preview");
+
+      const res = await completeSimple(
+        model,
+        {
+          messages: [
+            {
+              role: "user",
+              content: "Reply with ok.",
+              timestamp: now,
+            },
+            {
+              role: "assistant",
+              content: [
+                {
+                  type: "toolCall",
+                  id: "call_1",
+                  name: "bash",
+                  arguments: { command: "ls -la" },
+                  // No thoughtSignature: simulates Claude via Antigravity.
+                },
+              ],
+              api: "google-gemini-cli",
+              provider: "google-antigravity",
+              model: "claude-sonnet-4-20250514",
+              usage: {
+                input: 0,
+                output: 0,
+                cacheRead: 0,
+                cacheWrite: 0,
+                totalTokens: 0,
+                cost: {
+                  input: 0,
+                  output: 0,
+                  cacheRead: 0,
+                  cacheWrite: 0,
+                  total: 0,
+                },
+              },
+              stopReason: "stop",
+              timestamp: now,
+            },
+          ],
+          tools: [
+            {
+              name: "bash",
+              description: "Run shell command",
+              parameters: {
+                type: "object",
+                properties: {
+                  command: { type: "string" },
+                },
+                required: ["command"],
+              },
+            },
+          ],
+        },
+        {
+          apiKey: GEMINI_KEY,
+          reasoning: "low",
+          maxTokens: 128,
+        },
+      );
+
+      expect(res.stopReason).not.toBe("error");
+    },
+    20000,
+  );
+});