diff --git a/open-sse/services/__tests__/antigravity-quota-family.test.ts b/open-sse/services/__tests__/antigravity-quota-family.test.ts
index dbdcc69793..c23d79926b 100644
--- a/open-sse/services/__tests__/antigravity-quota-family.test.ts
+++ b/open-sse/services/__tests__/antigravity-quota-family.test.ts
@@ -21,15 +21,17 @@ describe("Antigravity account quota-family cooldown", () => {
   it("maps Gemini variants to Gemini family and Claude/Cloud variants to Claude family", () => {
     expect(getAntigravityQuotaFamily("gemini-3.5-flash-medium")).toBe("gemini");
     expect(getAntigravityQuotaFamily("google/gemini-3.5-flash-low")).toBe("gemini");
+    expect(getAntigravityQuotaFamily("agy/gemini-3.5-flash-medium")).toBe("gemini");
     expect(getAntigravityQuotaFamily("claude-sonnet-4")).toBe("claude");
     expect(getAntigravityQuotaFamily("cloud/claude-opus-4")).toBe("claude");
     expect(getAntigravityQuotaFamily("some-new-model")).toBe("other");
   });
 
   it("uses family-scoped lock key for Antigravity but preserves exact-model scope elsewhere", () => {
-    expect(getQuotaScopedModelForProvider(provider, "gemini-3.5-flash-medium")).toBe(
+    expect(getQuotaScopedModelForProvider("antigravity", "gemini-3.5-flash-medium")).toBe(
       "family:gemini"
     );
+    expect(getQuotaScopedModelForProvider("agy", "gemini-3.5-flash-medium")).toBe("family:gemini");
     expect(getQuotaScopedModelForProvider(provider, "gemini-3.5-flash-low")).toBe("family:gemini");
     expect(getQuotaScopedModelForProvider(provider, "claude-sonnet-4")).toBe("family:claude");
     expect(getQuotaScopedModelForProvider(provider, "unknown-model")).toBe("unknown-model");
diff --git a/open-sse/services/antigravityQuotaFamily.ts b/open-sse/services/antigravityQuotaFamily.ts
index e033291fa0..e9ede18749 100644
--- a/open-sse/services/antigravityQuotaFamily.ts
+++ b/open-sse/services/antigravityQuotaFamily.ts
@@ -18,7 +18,7 @@ function normalizeModelId(model: string | null | undefined): string {
 export function getAntigravityQuotaFamily(
   model: string | null | undefined
 ): AntigravityQuotaFamily {
-  const normalized = normalizeModelId(model).replace(/^antigravity\//, "");
+  const normalized = normalizeModelId(model).replace(/^(antigravity|agy)\//, "");
   const slashIndex = normalized.indexOf("/");
   const bare = slashIndex >= 0 ? normalized.slice(slashIndex + 1) : normalized;
 
@@ -42,7 +42,7 @@ export function getQuotaScopedModelForProvider(
   model: string | null | undefined
 ): string | null {
   if (!model) return null;
-  if (provider !== ANTIGRAVITY_PROVIDER_ID) return model;
+  if (provider !== "antigravity" && provider !== "agy") return model;
   const family = getAntigravityQuotaFamily(model);
   return family === "other" ? model : `family:${family}`;
 }
@@ -51,6 +51,6 @@ export function getQuotaScopeLabelForProvider(
   provider: string | null | undefined,
   model: string | null | undefined
 ): string {
-  if (provider !== ANTIGRAVITY_PROVIDER_ID) return "model";
+  if (provider !== "antigravity" && provider !== "agy") return "model";
   return getAntigravityQuotaFamily(model) === "other" ? "model" : "family";
 }
diff --git a/open-sse/services/rateLimitManager.ts b/open-sse/services/rateLimitManager.ts
index fe5bce878d..ab0e31f58f 100644
--- a/open-sse/services/rateLimitManager.ts
+++ b/open-sse/services/rateLimitManager.ts
@@ -10,6 +10,7 @@
 
 import Bottleneck from "bottleneck";
 import { parseRetryAfterFromBody } from "./accountFallback.ts";
+import { getAntigravityQuotaFamily } from "./antigravityQuotaFamily.ts";
 import { getProviderCategory } from "../config/providerRegistry.ts";
 import { getCodexRateLimitKey } from "../executors/codex.ts";
 import { awaitProviderDefaultSlot, setProviderQuotaOverrides } from "./providerDefaultRateLimit.ts";
@@ -460,6 +461,11 @@ function getLimiterKey(provider, connectionId, model = null) {
   if (provider === "codex" && model) {
     return `${provider}:${getCodexRateLimitKey(connectionId, model)}`;
   }
+  if ((provider === "antigravity" || provider === "agy") && model) {
+    const family = getAntigravityQuotaFamily(model);
+    const scope = family === "other" ? model : family;
+    return `${provider}:${connectionId}:${scope}`;
+  }
   // Gemini AI Studio and GitHub Copilot have per-model quotas — use model-scoped
   // limiter keys so a 429 on one model doesn't pause requests for other models.
   if ((provider === "gemini" || provider === "github") && model) {
diff --git a/src/domain/quotaCache.ts b/src/domain/quotaCache.ts
index 79062d53e2..75b037b986 100644
--- a/src/domain/quotaCache.ts
+++ b/src/domain/quotaCache.ts
@@ -24,6 +24,7 @@ import {
 } from "@/lib/db/quotaSnapshots";
 import { recordProviderQuotaResetEventIfChanged } from "@/lib/db/quotaResetEvents";
 import { getCodexQuotaWindowFilterForModel } from "@omniroute/open-sse/config/codexQuotaScopes.ts";
+import { getAntigravityQuotaFamily } from "@omniroute/open-sse/services/antigravityQuotaFamily.ts";
 
 // ─── Types ──────────────────────────────────────────────────────────────────
 
@@ -205,16 +206,38 @@ export function __clearForTests() {
   cache.clear();
 }
 
-export function isQuotaExhaustedForRequest(
+function isAntigravityQuotaExhausted(
   connectionId: string,
-  provider: string,
-  requestedModel: string | null = null
+  entry: QuotaCacheEntry,
+  requestedModel: string | null
 ): boolean {
-  if (!isAccountQuotaExhausted(connectionId)) return false;
-  if (provider !== "codex" || !requestedModel) return true;
-  const entry = getQuotaCache(connectionId);
-  const quotaNames = Object.keys(entry?.quotas || {});
-  if (quotaNames.length === 0) return true;
+  if (!requestedModel) return entry.exhausted;
+  const quotaNames = Object.keys(entry.quotas || {});
+  if (quotaNames.length === 0) return entry.exhausted;
+  const requestedFamily = getAntigravityQuotaFamily(requestedModel);
+  const cleanRequestedModel = requestedModel.replace(/^(antigravity|agy)\//, "");
+  const matchingWindows = quotaNames.filter((windowName) => {
+    if (requestedFamily === "other") {
+      return windowName.replace(/^(antigravity|agy)\//, "") === cleanRequestedModel;
+    }
+    return getAntigravityQuotaFamily(windowName) === requestedFamily;
+  });
+  return (
+    matchingWindows.length > 0 &&
+    matchingWindows.every(
+      (windowName) => getQuotaWindowStatus(connectionId, windowName, 100)?.reachedThreshold
+    )
+  );
+}
+
+function isCodexQuotaExhausted(
+  connectionId: string,
+  entry: QuotaCacheEntry,
+  requestedModel: string | null
+): boolean {
+  if (!requestedModel) return entry.exhausted;
+  const quotaNames = Object.keys(entry.quotas || {});
+  if (quotaNames.length === 0) return entry.exhausted;
   const filterWindow = getCodexQuotaWindowFilterForModel(requestedModel);
   const scopedWindowNames = quotaNames.filter((windowName) => filterWindow?.(windowName));
   return (
@@ -225,6 +248,40 @@ export function isQuotaExhaustedForRequest(
   );
 }
 
+function isStandardQuotaExhausted(entry: QuotaCacheEntry, now: number): boolean {
+  if (!entry.exhausted) return false;
+  const age = now - entry.fetchedAt;
+  if (!entry.nextResetAt && age > EXHAUSTED_TTL_MS) return false;
+  return true;
+}
+
+export function isQuotaExhaustedForRequest(
+  connectionId: string,
+  provider: string,
+  requestedModel: string | null = null
+): boolean {
+  const entry = cache.get(connectionId) || hydrateQuotaCacheFromSnapshots(connectionId);
+  if (!entry) return false;
+
+  const now = Date.now();
+  const advanced = advancedWindowResetAt(entry, now);
+  if (advanced) {
+    entry.exhausted = false;
+    return false;
+  }
+
+  if (provider === "antigravity" || provider === "agy") {
+    return isAntigravityQuotaExhausted(connectionId, entry, requestedModel);
+  }
+
+  if (provider === "codex") {
+    return isCodexQuotaExhausted(connectionId, entry, requestedModel);
+  }
+
+  // Standard (non-per-model-quota) providers: check connection-wide aggregate
+  return isStandardQuotaExhausted(entry, now);
+}
+
 /**
  * Store quota data for a connection (called by usage endpoint and background refresh).
  */
diff --git a/tests/unit/antigravity-quota-skipping.test.ts b/tests/unit/antigravity-quota-skipping.test.ts
new file mode 100644
index 0000000000..a9b1f7b79b
--- /dev/null
+++ b/tests/unit/antigravity-quota-skipping.test.ts
@@ -0,0 +1,110 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omni-quota-antigravity-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const coreDb = await import("../../src/lib/db/core.ts");
+const quotaCache = await import("../../src/domain/quotaCache.ts");
+
+test.after(() => {
+  coreDb.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+});
+
+test("isQuotaExhaustedForRequest isolates Claude and Gemini quota families for antigravity & agy", () => {
+  const connectionId = "conn-antigravity-test";
+
+  // Simulate Claude Opus being exhausted, while Gemini is NOT.
+  quotaCache.setQuotaCache(connectionId, "antigravity", {
+    "claude-opus-4-6-thinking": { remainingPercentage: 0, resetAt: null },
+    "gemini-3.5-flash-high": { remainingPercentage: 100, resetAt: null },
+  });
+
+  // Verify that Claude models are considered exhausted.
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(
+      connectionId,
+      "antigravity",
+      "antigravity/claude-opus-4-6-thinking"
+    ),
+    true,
+    "Claude Opus should be exhausted"
+  );
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(
+      connectionId,
+      "antigravity",
+      "antigravity/claude-sonnet-4-6"
+    ),
+    true,
+    "Claude Sonnet should share Claude family quota and be exhausted"
+  );
+
+  // Verify that Gemini models are NOT considered exhausted.
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(
+      connectionId,
+      "antigravity",
+      "antigravity/gemini-3.5-flash-high"
+    ),
+    false,
+    "Gemini Flash should NOT be exhausted"
+  );
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(
+      connectionId,
+      "antigravity",
+      "antigravity/gemini-2.5-pro"
+    ),
+    false,
+    "Gemini Pro should share Gemini family quota and NOT be exhausted"
+  );
+
+  // Test that 'agy' spelling behaves the exact same way.
+  const connectionIdAgy = "conn-agy-test";
+  quotaCache.setQuotaCache(connectionIdAgy, "agy", {
+    "claude-opus-4-6-thinking": { remainingPercentage: 0, resetAt: null },
+    "gemini-3.5-flash-high": { remainingPercentage: 100, resetAt: null },
+  });
+
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(connectionIdAgy, "agy", "agy/claude-opus-4-6-thinking"),
+    true,
+    "Claude Opus under 'agy' should be exhausted"
+  );
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(connectionIdAgy, "agy", "agy/gemini-3.5-flash-high"),
+    false,
+    "Gemini Flash under 'agy' should NOT be exhausted"
+  );
+
+  // Test that unknown models (family 'other') preserve exact-model scoping.
+  const connectionIdOther = "conn-other-test";
+  quotaCache.setQuotaCache(connectionIdOther, "antigravity", {
+    "unknown-model-a": { remainingPercentage: 0, resetAt: null },
+    "unknown-model-b": { remainingPercentage: 100, resetAt: null },
+  });
+
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(
+      connectionIdOther,
+      "antigravity",
+      "antigravity/unknown-model-a"
+    ),
+    true,
+    "Unknown model A should be exhausted"
+  );
+  assert.equal(
+    quotaCache.isQuotaExhaustedForRequest(
+      connectionIdOther,
+      "antigravity",
+      "antigravity/unknown-model-b"
+    ),
+    false,
+    "Unknown model B should NOT be exhausted"
+  );
+});