diff --git a/src/discord/bot.ts b/src/discord/bot.ts
index cd4f7f2..9c90dd5 100644
--- a/src/discord/bot.ts
+++ b/src/discord/bot.ts
@@ -37,7 +37,11 @@ export function attachBotHandlers(client: Client, config: AppConfig): void {
   });
 }
 
-function resolveAnchorPosition(guild: { roles: { cache: { get(id: string): { position: number } | undefined } } }, anchorRoleId: string | null): number {
-  if (!anchorRoleId) return 1;
-  return guild.roles.cache.get(anchorRoleId)?.position ?? 1;
+function resolveAnchorPosition(guild: { members: { me: { roles: { highest: { position: number } } } | null }; roles: { cache: { get(id: string): { position: number } | undefined } } }, anchorRoleId: string | null): number {
+  if (!anchorRoleId) return botRolePosition(guild);
+  return guild.roles.cache.get(anchorRoleId)?.position ?? botRolePosition(guild);
+}
+
+function botRolePosition(guild: { members: { me: { roles: { highest: { position: number } } } | null } }): number {
+  return guild.members.me?.roles.highest.position ?? 1;
 }
diff --git a/src/discord/interactionHandler.test.ts b/src/discord/interactionHandler.test.ts
index 211f942..a01baad 100644
--- a/src/discord/interactionHandler.test.ts
+++ b/src/discord/interactionHandler.test.ts
@@ -1,7 +1,8 @@
+import { MessageFlags } from "discord.js";
 import { describe, expect, test } from "bun:test";
 import { handleInteraction, type BoosterRoleCommandService, type ChatInputInteractionLike } from "./interactionHandler";
 
-type Reply = { content: string; ephemeral: boolean };
+type Reply = { content: string; flags: MessageFlags.Ephemeral };
 
 class FakeInteraction implements ChatInputInteractionLike {
   commandName = "booster-role";
@@ -59,7 +60,7 @@ describe("handleInteraction", () => {
     await handleInteraction(interaction, service, { isBoosting: async () => true });
 
     expect(service.calls).toEqual(["claim"]);
-    expect(interaction.replies[0]).toEqual({ content: "Booster role created: <@&role-1>", ephemeral: true });
+    expect(interaction.replies[0]).toEqual({ content: "Booster role created: <@&role-1>", flags: MessageFlags.Ephemeral });
   });
 
   test("routes update subcommands and replies", async () => {
@@ -70,7 +71,7 @@ describe("handleInteraction", () => {
       await handleInteraction(interaction, service, { isBoosting: async () => true });
 
       expect(service.calls).toEqual([subcommand]);
-      expect(interaction.replies[0]?.ephemeral).toBe(true);
+      expect(interaction.replies[0]?.flags).toBe(MessageFlags.Ephemeral);
     }
   });
 
@@ -83,6 +84,6 @@ describe("handleInteraction", () => {
 
     await handleInteraction(interaction, service, { isBoosting: async () => true });
 
-    expect(interaction.replies[0]).toEqual({ content: "Role name is already used", ephemeral: true });
+    expect(interaction.replies[0]).toEqual({ content: "Role name is already used", flags: MessageFlags.Ephemeral });
   });
 });
diff --git a/src/discord/interactionHandler.ts b/src/discord/interactionHandler.ts
index 57cf47a..5cffcd2 100644
--- a/src/discord/interactionHandler.ts
+++ b/src/discord/interactionHandler.ts
@@ -1,3 +1,4 @@
+import { MessageFlags } from "discord.js";
 import type { BoosterRoleRecord, RoleIcon } from "../services/boosterRoleService";
 
 export type ChatInputInteractionLike = {
@@ -5,7 +6,7 @@ export type ChatInputInteractionLike = {
   guildId: string | null;
   user: { id: string };
   isChatInputCommand(): boolean;
-  reply(input: { content: string; ephemeral: boolean }): Promise<unknown>;
+  reply(input: { content: string; flags: MessageFlags.Ephemeral }): Promise<unknown>;
   options: {
     getSubcommand(): string;
     getString(name: string): string | null;
@@ -46,37 +47,37 @@ export async function handleInteraction(
         icon: optionalIcon(interaction, "icon"),
         isBoosting: await deps.isBoosting(guildId, userId)
       });
-      await interaction.reply({ content: `Booster role created: <@&${role.roleId}>`, ephemeral: true });
+      await interaction.reply({ content: `Booster role created: <@&${role.roleId}>`, flags: MessageFlags.Ephemeral });
       return;
     }
 
     if (subcommand === "rename") {
       await service.renameRole({ guildId, userId, name: requireString(interaction, "name") });
-      await interaction.reply({ content: "Booster role renamed.", ephemeral: true });
+      await interaction.reply({ content: "Booster role renamed.", flags: MessageFlags.Ephemeral });
       return;
     }
 
     if (subcommand === "recolor") {
       await service.recolorRole({ guildId, userId, color: requireString(interaction, "color") });
-      await interaction.reply({ content: "Booster role color updated.", ephemeral: true });
+      await interaction.reply({ content: "Booster role color updated.", flags: MessageFlags.Ephemeral });
       return;
     }
 
     if (subcommand === "icon") {
       await service.setRoleIcon({ guildId, userId, icon: requireIcon(interaction, "image") });
-      await interaction.reply({ content: "Booster role icon updated.", ephemeral: true });
+      await interaction.reply({ content: "Booster role icon updated.", flags: MessageFlags.Ephemeral });
       return;
     }
 
     if (subcommand === "delete") {
       await service.deleteRole({ guildId, userId });
-      await interaction.reply({ content: "Booster role deleted.", ephemeral: true });
+      await interaction.reply({ content: "Booster role deleted.", flags: MessageFlags.Ephemeral });
       return;
     }
 
     throw new Error("Unknown booster-role subcommand");
   } catch (error) {
-    await interaction.reply({ content: error instanceof Error ? error.message : "Command failed", ephemeral: true });
+    await interaction.reply({ content: error instanceof Error ? error.message : "Command failed", flags: MessageFlags.Ephemeral });
   }
 }
 
diff --git a/src/services/boosterRoleService.test.ts b/src/services/boosterRoleService.test.ts
index 712c25a..5b741b4 100644
--- a/src/services/boosterRoleService.test.ts
+++ b/src/services/boosterRoleService.test.ts
@@ -20,6 +20,7 @@ class MemoryRoleStore {
 class FakeRoleRepository implements RoleRepository {
   roles = new Map<string, { id: string; name: string; permissions: string[]; position: number; color: string | null; icon?: string | null }>();
   deletedRoleIds: string[] = [];
+  assignedRoles: Array<{ userId: string; roleId: string }> = [];
 
   constructor(initialRoles = [{ id: "existing-vip", name: "VIP", permissions: [], position: 1, color: null }]) {
     for (const role of initialRoles) {
@@ -43,6 +44,10 @@ class FakeRoleRepository implements RoleRepository {
     this.roles.set(roleId, { ...role, ...input });
   }
 
+  async assignRole(userId: string, roleId: string) {
+    this.assignedRoles.push({ userId, roleId });
+  }
+
   async deleteRole(roleId: string) {
     this.deletedRoleIds.push(roleId);
     this.roles.delete(roleId);
@@ -60,6 +65,7 @@ describe("BoosterRoleService", () => {
     expect(claimed.roleId).toBe("created-2");
     expect(roles.roles.get(claimed.roleId)?.permissions).toEqual([]);
     expect(roles.roles.get(claimed.roleId)?.position).toBe(9);
+    expect(roles.assignedRoles).toEqual([{ userId: "user", roleId: claimed.roleId }]);
     expect(await store.findByUser("guild", "user")).toEqual(claimed);
   });
 
diff --git a/src/services/boosterRoleService.ts b/src/services/boosterRoleService.ts
index 97a0fa6..50e6e06 100644
--- a/src/services/boosterRoleService.ts
+++ b/src/services/boosterRoleService.ts
@@ -28,6 +28,7 @@ export type RoleRepository = {
   listRoles(): Promise<ExistingRole[]>;
   createRole(input: { name: string; color: string | null; permissions: string[]; position: number }): Promise<{ id: string }>;
   updateRole(roleId: string, input: { name?: string; color?: string | null; icon?: string | null }): Promise<void>;
+  assignRole(userId: string, roleId: string): Promise<void>;
   deleteRole(roleId: string): Promise<void>;
 };
 
@@ -83,6 +84,8 @@ export class BoosterRoleService {
       await this.roles.updateRole(role.id, { icon: input.icon.dataUri });
     }
 
+    await this.roles.assignRole(userId, role.id);
+
     const timestamp = this.now();
     const record = {
       guildId,
diff --git a/src/services/discordRoleRepository.ts b/src/services/discordRoleRepository.ts
index 1a23d6e..5ddaf07 100644
--- a/src/services/discordRoleRepository.ts
+++ b/src/services/discordRoleRepository.ts
@@ -12,7 +12,7 @@ export class DiscordRoleRepository implements RoleRepository {
   async createRole(input: { name: string; color: string | null; permissions: string[]; position: number }): Promise<{ id: string }> {
     const role = await this.guild.roles.create({
       name: input.name,
-      color: toDiscordColor(input.color),
+      colors: toDiscordColors(input.color),
       permissions: 0n
     });
 
@@ -24,11 +24,16 @@ export class DiscordRoleRepository implements RoleRepository {
     const role = await this.fetchRole(roleId);
     await role.edit({
       name: input.name,
-      color: input.color === undefined ? undefined : toDiscordColor(input.color),
+      colors: input.color === undefined ? undefined : toDiscordColors(input.color),
       icon: input.icon === undefined ? undefined : input.icon
     });
   }
 
+  async assignRole(userId: string, roleId: string): Promise<void> {
+    const member = await this.guild.members.fetch(userId);
+    await member.roles.add(roleId);
+  }
+
   async deleteRole(roleId: string): Promise<void> {
     const role = await this.fetchRole(roleId);
     await role.delete();
@@ -48,6 +53,6 @@ export class DiscordRoleRepository implements RoleRepository {
   }
 }
 
-function toDiscordColor(color: string | null): ColorResolvable | undefined {
-  return color === null ? undefined : (color as ColorResolvable);
+function toDiscordColors(color: string | null): { primaryColor: ColorResolvable } | undefined {
+  return color === null ? undefined : { primaryColor: color as ColorResolvable };
 }