diff --git a/packages/web-ui/src/agent/agent.ts b/packages/web-ui/src/agent/agent.ts
index 7e92505e..befc59d1 100644
--- a/packages/web-ui/src/agent/agent.ts
+++ b/packages/web-ui/src/agent/agent.ts
@@ -54,7 +54,7 @@ export interface AgentOptions {
 	debugListener?: (entry: DebugLogEntry) => void;
 	transport: AgentTransport;
 	// Transform app messages to LLM-compatible messages before sending to transport
-	messageTransformer?: (messages: AppMessage[]) => Message[];
+	messageTransformer?: (messages: AppMessage[]) => Message[] | Promise<Message[]>;
 }
 
 export class Agent {
@@ -73,7 +73,7 @@ export class Agent {
 	private abortController?: AbortController;
 	private transport: AgentTransport;
 	private debugListener?: (entry: DebugLogEntry) => void;
-	private messageTransformer: (messages: AppMessage[]) => Message[];
+	private messageTransformer: (messages: AppMessage[]) => Message[] | Promise<Message[]>;
 
 	constructor(opts: AgentOptions) {
 		this._state = { ...this._state, ...opts.initialState };
@@ -170,7 +170,7 @@ export class Agent {
 			let turnStart = 0;
 
 			// Transform app messages to LLM-compatible messages
-			const llmMessages = this.messageTransformer(this._state.messages);
+			const llmMessages = await this.messageTransformer(this._state.messages);
 
 			for await (const ev of this.transport.run(
 				llmMessages,
diff --git a/packages/web-ui/src/index.ts b/packages/web-ui/src/index.ts
index f52c9724..f87009bf 100644
--- a/packages/web-ui/src/index.ts
+++ b/packages/web-ui/src/index.ts
@@ -78,4 +78,4 @@ export type { Attachment } from "./utils/attachment-utils.js";
 export { loadAttachment } from "./utils/attachment-utils.js";
 export { clearAuthToken, getAuthToken } from "./utils/auth-token.js";
 export { formatCost, formatModelCost, formatTokenCount, formatUsage } from "./utils/format.js";
-export { i18n, setLanguage } from "./utils/i18n.js";
+export { i18n, setLanguage, translations } from "./utils/i18n.js";
diff --git a/packages/web-ui/src/utils/i18n.ts b/packages/web-ui/src/utils/i18n.ts
index 279efc0d..b7588935 100644
--- a/packages/web-ui/src/utils/i18n.ts
+++ b/packages/web-ui/src/utils/i18n.ts
@@ -138,7 +138,7 @@ declare module "@mariozechner/mini-lit" {
 	}
 }
 
-const translations = {
+export const translations = {
 	en: {
 		...defaultEnglish,
 		Free: "Free",