diff --git a/proto/global_admin.proto b/proto/global_admin.proto
index 66ced48..ff5f04a 100644
--- a/proto/global_admin.proto
+++ b/proto/global_admin.proto
@@ -1,5 +1,7 @@
 syntax = "proto3";
 
+import "permissionrules.proto";
+
 option go_package = "github.com/momentohq/client-sdk-go;client_sdk_go";
 option java_multiple_files = true;
 option java_package = "grpc.global_admin";
@@ -22,6 +24,9 @@ service GlobalAdmin {
   rpc RejectInvitation(_RejectInvitationRequest) returns (_RejectInvitationResponse) {}
   rpc ListInvitationsForAccount(_ListInvitationsForAccountRequest) returns (_ListInvitationsForAccountResponse) {}
   rpc RevokeInvitation(_RevokeInvitationRequest) returns (_RevokeInvitationResponse) {}
+  rpc ListRolesForAccount(_ListRolesForAccountRequest) returns (_ListRolesForAccountResponse) {}
+  rpc SetMemberRole(_SetMemberRoleRequest) returns (_SetMemberRoleResponse) {}
+
 }
 
 message _SetAccountNameRequest {
@@ -30,7 +35,6 @@ message _SetAccountNameRequest {
 
 message _SetAccountNameResponse {}
 
-// No parameters required - we derive identity from the auth header.
 message _GetAccountsRequest {
 }
 
@@ -53,6 +57,8 @@ message _GetInvitationsForUserResponse {
 message _Account {
   string id = 1;
   string account_name = 2;
+  string role_id = 3;
+  string role_name = 4;
 }
 
 message _GetAccountSessionTokenRequest {
@@ -61,18 +67,21 @@ message _GetAccountSessionTokenRequest {
 
 message _GetAccountSessionTokenResponse {
   string account_session_token = 1;
+  permission_rules.PermissionSet permissions = 2;
 }
 
 // API Key needs to be provided via the "authorization" header.
 // The Account to add the User to is derived from the API key, which is account-scoped.
 message _InviteMemberRequest {
   string user_name = 1;
+  string role_id = 2;
 }
 
 // This response is for when a Member is invited to the Account,
 // These are some of the Errors and their corresponding GRPC status codes.
 // 1. User is already a Member. grpc code = FAILED_PRECONDITION. Metadata: "err" -> "already_a_member".
 // 2. Account has too many Members. grpc code = RESOURCE_EXHAUSTED. Metadata: "err" -> "max_member_count_exceeded".
+// 3. Invalid role. grpc code = INVALID_ARGUMENT.
 message _InviteMemberResponse {
 }
 
@@ -100,7 +109,8 @@ message _ListInvitationsForAccountRequest {}
 
 message _Invitation {
   string id = 1;
-  _Member member = 2;
+  _Member member = 2; // TODO: deprecate after migrating to new roles
+  _AccountMember account_member = 3;
 }
 
 message _ListInvitationsForAccountResponse {
@@ -144,8 +154,15 @@ message _Member {
   Role role = 2;
 }
 
+message _AccountMember {
+  string user_name = 1;
+  string role_id = 2;
+  string role_name = 3;
+}
+
 message _ListMembersResponse {
-  repeated _Member members = 1;
+  repeated _Member members = 1; // TODO: Deprecate this once we migrate to new roles
+  repeated _AccountMember account_members = 2;
 }
 
 // API Key needs to be provided via the "authorization" header.
@@ -162,3 +179,42 @@ message Endpoint {
   string domain_name = 2; // domain name for talking to this Endpoint, e.g. `cell-4-us-west-2-1.prod.a.momentohq.com`
   string region = 3; // AWS region, e.g. `us-west-2`
 }
+
+message _ListRolesForAccountRequest {
+}
+
+
+enum RoleType {
+  SYSTEM = 0;
+  CUSTOM = 1;
+}
+
+message AccountRole {
+  string role_id = 1; // unique identifier
+  string role_name = 2; // friendly name
+  permission_rules.PermissionSet permissions = 3; // permissions associated with the role
+  RoleType role_type = 4; // system or custom role
+}
+
+// This response is when we list all the roles for an account (system roles + custom roles).
+// These are the error cases:
+// 1. Account does not exist. grpc code = NOT_FOUND. Metadata: "err" -> "account_not_found".
+message _ListRolesForAccountResponse {
+  repeated AccountRole roles = 1;
+}
+
+message _SetMemberRoleRequest {
+  string user_name = 1;
+  string desired_role_id = 2;
+}
+
+// This response is when a Member has their membership status changed successfully.
+// These are the error cases:
+// 1. User is not a member. grpc code = NOT_FOUND. Metadata: "err" -> "user_is_not_a_member".
+// 2. User already has the desired membership status. grpc code = FAILED_PRECONDITION. Metadata: "err" -> "same_role".
+// 3. Last Owner cannot be demoted. grpc code = FAILED_PRECONDITION. Metadata: "err" -> "only_owner_cannot_be_removed".
+// 4. User does not exist. grpc code = NOT_FOUND. Metadata: "err" -> "user_not_found".
+// 5. Account does not exist. grpc code = NOT_FOUND. Metadata: "err" -> "account_not_found".
+// 6. Role does not exist. grpc code = NOT_FOUND. Metadata: "err" -> "role_not_found".
+message _SetMemberRoleResponse {
+}
diff --git a/proto/permissionrules.proto b/proto/permissionrules.proto
new file mode 100644
index 0000000..4a6a488
--- /dev/null
+++ b/proto/permissionrules.proto
@@ -0,0 +1,199 @@
+syntax = "proto3";
+
+option go_package = "github.com/momentohq/client-sdk-go;client_sdk_go";
+option java_multiple_files = true;
+option java_package = "grpc.permission_rules";
+option csharp_namespace = "Momento.Protos.PermissionRules";
+
+package permission_rules;
+
+// This is "Version 2" of permissions in Momento.
+
+// Some general terminology (exceptions to be noted)
+// Read = "access a specific resource without modification"
+// List = "access a unspecified set of resources without modification" List is separated from read many. List actions
+//   cannot predetermine which resources will be accessed. List is always total - it cannot be restricted by a resource
+//   selector.
+// Write = "access a resource or resources with modification"
+
+// Used for generic "everything" resource selectors.
+message All {}
+
+// Permissions related to global account management APIs
+enum AccountManagementPermissions {
+  // Can only read account information
+  AccountRead = 0;
+  // Can take management actions
+  AccountWrite = 1;
+  // Can list accounts
+  AccountList = 2;
+}
+
+// Permissions related to managing authentication resources.
+enum AuthManagementPermissions {
+  // Can only read auth keys/roles metadata. Read does not allow retrieving secrets - that is considered "modification"
+  AuthRead = 0;
+  // Can create and manage auth keys/roles
+  AuthWrite = 1;
+  // Can list auth keys/roles metadata. List does not allow retrieving secrets - that is considered "modification"
+  AuthList = 2;
+}
+
+// Permissions related to managing Momento resources (Caches, Stores, Webhooks, etc.)
+enum ResourceManagementPermissions {
+  // Can only read resources
+  ResourceRead = 0;
+  // Can create/manage resources
+  ResourceWrite = 1;
+  // Can list resources
+  ResourceList = 2;
+}
+
+enum CacheAPIPermissions {
+  // Does not apply to individual resources
+  CacheList = 0;
+  // Restricts access to apis that read data from caches: No higher level resource description or modification.
+  CacheRead = 1;
+  // Restricts access to apis that write to caches: No higher level resource description or modification.
+  CacheWrite = 2;
+}
+
+// Allows specifying specific caches.
+message CacheSelector {
+  oneof kind {
+    string cache_name = 1;
+  }
+}
+
+// Allows specifying specific items within caches.
+message CacheItemSelector {
+  oneof kind {
+    bytes key = 1;
+    bytes key_prefix = 2;
+  }
+}
+
+enum StoreAPIPermissions {
+  // Does not apply to individual resources
+  StoreList = 0;
+  // Restricts access to apis that read data from stores: No higher level resource description or modification.
+  StoreRead = 1;
+  // Restricts access to apis that write to stores: No higher level resource description or modification.
+  StoreWrite = 2;
+}
+
+// Allows specifying specific stores.
+message StoreSelector {
+  oneof kind {
+    string store_name = 1;
+  }
+}
+
+// Allows specifying specific items within stores.
+message StoreItemSelector {
+  oneof kind {
+    bytes key = 1;
+    bytes key_prefix = 2;
+  }
+}
+
+// Topic API Restrictions
+enum TopicAPIPermissions {
+  // Does not apply to individual resources
+  TopicList = 0;
+  // Restricts access to apis that read data from topics: No higher level resource description or modification.
+  TopicRead = 1;
+  // Restricts access to apis that write to topics: No higher level resource description or modification.
+  TopicWrite = 2;
+}
+
+// Allows specifying specific topics within caches.
+message TopicSelector {
+  oneof kind {
+    string topic_name = 1;
+    string topic_name_prefix = 2;
+  }
+}
+
+message PermissionSet {
+  oneof kind {
+    SuperUserPermissions super_user = 1;
+    ExplicitPermissions explicit = 2;
+  }
+}
+
+enum SuperUserPermissions {
+  SuperUser = 0;
+}
+
+message ExplicitPermissions {
+  repeated Rule rules = 1;
+}
+
+message Rule {
+  oneof kind {
+    AccountManagementRule account_management_rule = 1;
+    AuthManagementRule auth_management_rule = 2;
+    ResourceManagementRule resource_management_rule = 3;
+    CacheRule cache_rule = 4;
+    TopicRule topic_rule = 5;
+    StoreRule storage_rule = 6;
+  }
+
+  message AccountManagementRule {
+    repeated AccountManagementPermissions permissions = 1;
+    // No resource selectors here - permissions are inherently account-scoped.
+  }
+
+  message AuthManagementRule {
+    repeated AuthManagementPermissions permissions = 1;
+    // No fine-grained resource control yet.
+    oneof auth_items {
+      All all_items = 2;
+    }
+  }
+
+  message ResourceManagementRule {
+    repeated ResourceManagementPermissions permissions = 1;
+    // No fine-grained resource control yet.
+    oneof resources {
+      All all_resources = 2;
+    }
+  }
+
+  message CacheRule {
+    repeated CacheAPIPermissions permissions = 1;
+    oneof cache {
+      All all_caches = 2;
+      CacheSelector cache_selector = 3;
+    }
+    oneof cache_item {
+      All all_items = 4;
+      CacheItemSelector item_selector = 5;
+    }
+  }
+
+  message TopicRule {
+    repeated TopicAPIPermissions permissions = 1;
+    oneof cache {
+      All all_caches = 2;
+      CacheSelector cache_selector = 3;
+    }
+    oneof topic {
+      All all_topics = 4;
+      TopicSelector topic_selector = 5;
+    }
+  }
+
+  message StoreRule {
+    repeated StoreAPIPermissions permissions = 1;
+    oneof store {
+      All all_stores = 2;
+      StoreSelector store_selector = 3;
+    }
+    oneof store_item {
+      All all_items = 4;
+      StoreItemSelector item_selector = 5;
+    }
+  }
+}