[WRONG BRANCH] fix(antigravity): route partial Gemini 3.7 discovery tiers to tiered wire id

src/providers/antigravity-models.ts

@@ -48,6 +48,15 @@ const RETIRED_FLASH_TIERS: Record<string, string> = {
   "gemini-3-flash-agent": "high",
 };
 
+// Some discovery responses still publish the current Flash thinking levels as
+// separate rows. These IDs are picker-visible when the response contains only a
+// partial tier set, but CCA accepts them only through the tiered wire ID.
+const CURRENT_FLASH_DISCOVERY_TIERS: Record<string, string> = {
+  "gemini-3.7-flash-low": "low",
+  "gemini-3.7-flash-medium": "medium",
+  "gemini-3.7-flash-high": "high",
+};
+
 const ANTIGRAVITY_WIRE_MODELS = [
   "gemini-3.7-flash-tiered",
   "gemini-3.1-pro-low",
@@ -361,16 +370,24 @@ export function retiredAntigravityFlashTier(modelId: string): string | undefined
  * Resolve a picker-visible base model + optional reasoning effort to the CCA wire model ID.
  *
  * Precedence (evaluated in order):
- * 1. Suffix wire ID or compat alias → resolve via `resolveAntigravityWireModelId`, no thinkingConfig.
- * 2. Mapped Gemini base with effort → return mapped wire ID + thinkingLevel.
- * 3. Mapped Gemini base without effort → return default-effort wire ID, no thinkingConfig.
- * 4. Claude Opus with effort → return identity + thinkingLevel (no suffix variants exist).
- * 5. All other IDs → return `resolveAntigravityWireModelId(modelId)`, no thinkingConfig.
+ * 1. Current Flash discovery tier → tiered wire ID + its thinkingLevel.
+ * 2. Suffix wire ID or compat alias → resolve via `resolveAntigravityWireModelId`, no thinkingConfig.
+ * 3. Mapped Gemini base with effort → return mapped wire ID + thinkingLevel.
+ * 4. Mapped Gemini base without effort → return default-effort wire ID, no thinkingConfig.
+ * 5. Claude Opus with effort → return identity + thinkingLevel (no suffix variants exist).
+ * 6. All other IDs → return `resolveAntigravityWireModelId(modelId)`, no thinkingConfig.
  */
 export function resolveAntigravityEffortWireModel(
   modelId: string,
   effort?: string,
 ): { wireModelId: string; thinkingLevel?: string } {
+  const discoveryTier = Object.hasOwn(CURRENT_FLASH_DISCOVERY_TIERS, modelId)
+    ? CURRENT_FLASH_DISCOVERY_TIERS[modelId]
+    : undefined;
+  if (discoveryTier) {
+    return { wireModelId: GEMINI_FLASH_WIRE_ID, thinkingLevel: discoveryTier };
+  }
+
   // Rule 0: retired Flash id — Google has taken the wire id offline, so route to the
   // current generation and carry the tier the retired id encoded. This runs BEFORE the
   // suffix check because those ids are aliases, and rule 1 would drop the tier.

tests/google-antigravity-wire.test.ts

@@ -197,6 +197,24 @@ describe("antigravity CCA envelope", () => {
     }
   });
 
+  test("routes partial Gemini 3.7 discovery tiers through thinkingLevel", async () => {
+    for (const [modelId, thinkingLevel] of [
+      ["gemini-3.7-flash-low", "low"],
+      ["gemini-3.7-flash-medium", "medium"],
+      ["gemini-3.7-flash-high", "high"],
+    ] as const) {
+      expect(resolveAntigravityEffortWireModel(modelId)).toEqual({
+        wireModelId: "gemini-3.7-flash-tiered",
+        thinkingLevel,
+      });
+
+      const req = await createGoogleAdapter(effortProvider).buildRequest(parsedWithEffort(modelId));
+      const env = JSON.parse(req.body);
+      expect(env.model).toBe("gemini-3.7-flash-tiered");
+      expect(env.request.generationConfig.thinkingConfig).toEqual({ thinkingLevel });
+    }
+  });
+
   test("ignores inherited CCA model and alias properties", () => {
     const inheritedModels = Object.create(null) as Record<string, unknown>;
     Object.defineProperty(inheritedModels, "__proto__", {