diff --git a/litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py b/litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py
index dcb8a4a6f61..319db48ee98 100644
--- a/litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py
+++ b/litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py
@@ -3642,7 +3642,7 @@ class MCPRequestHandler:
         requires_fresh_policy: bool = False,
     ) -> list[str]:
         """
-        Resolve MCP access groups to server IDs by querying BOTH the MCP server table (DB) AND config-loaded servers.
+        Resolve MCP access groups against the operation snapshot, or database and config outside an operation.
         ``requires_fresh_policy`` reads the writer and propagates a read fault instead of resolving to no servers.
         """
         from litellm.proxy.proxy_server import prisma_client
@@ -3653,6 +3653,10 @@ class MCPRequestHandler:
                 global_mcp_server_manager,
             )
 
+            snapshot: Final = global_mcp_server_manager.catalog.current()
+            if snapshot is not None:
+                return list(MCPRequestHandler._get_config_server_ids_for_access_groups(snapshot.servers, access_groups))
+
             # Use the new helper for config-loaded servers
             server_ids: Final = MCPRequestHandler._get_config_server_ids_for_access_groups(
                 global_mcp_server_manager.config_mcp_servers, access_groups
diff --git a/tests/unit/proxy/_experimental/mcp_server/test_mcp_server_manager.py b/tests/unit/proxy/_experimental/mcp_server/test_mcp_server_manager.py
index 74be8bcb827..9b04021340b 100644
--- a/tests/unit/proxy/_experimental/mcp_server/test_mcp_server_manager.py
+++ b/tests/unit/proxy/_experimental/mcp_server/test_mcp_server_manager.py
@@ -18607,3 +18607,21 @@ async def test_catalog_revision_failure_preserves_state_and_recovers(monkeypatch
     assert unavailable.value.detail == "MCP server configuration could not be refreshed"
     assert manager.registry["catalog-server"].name == "initial"
     assert (await manager.catalog.resolve("catalog-server")).name == "updated"
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("groups", [[], ["catalog-group"]])
+async def test_access_group_resolution_uses_the_operation_catalog(monkeypatch, groups):
+    from litellm.proxy._experimental.mcp_server import mcp_server_manager
+    from litellm.proxy._experimental.mcp_server.auth.user_api_key_auth_mcp import MCPRequestHandler
+
+    row = _catalog_row().model_copy(update={"mcp_access_groups": groups})
+    _catalog_database(monkeypatch, AsyncMock(return_value=[row]))
+    manager = MCPServerManager()
+    monkeypatch.setattr(mcp_server_manager, "global_mcp_server_manager", manager)
+    stale = AsyncMock(return_value=set() if groups else {row.server_id})
+    monkeypatch.setattr(MCPRequestHandler, "_get_db_server_ids_for_access_groups", stale)
+    async with manager.catalog.operation():
+        allowed = await MCPRequestHandler._get_mcp_servers_from_access_groups(["catalog-group"])
+        assert set(allowed) == ({row.server_id} if groups else set())
+    stale.assert_not_awaited()