diff --git a/.changeset/rare-waves-help.md b/.changeset/rare-waves-help.md
new file mode 100644
index 0000000000000..1406344ae4ec8
--- /dev/null
+++ b/.changeset/rare-waves-help.md
@@ -0,0 +1,6 @@
+---
+"@rocket.chat/meteor": patch
+"@rocket.chat/rest-typings": patch
+---
+
+Add OpenAPI support for the Rocket.Chat users.getAvatarSuggestion API endpoints by migrating to a modern chained route definition syntax and utilizing shared AJV schemas for validation to enhance API documentation and ensure type safety through response validation.
diff --git a/apps/meteor/app/api/server/v1/users.ts b/apps/meteor/app/api/server/v1/users.ts
index b418d555761fd..5b831214d6a22 100644
--- a/apps/meteor/app/api/server/v1/users.ts
+++ b/apps/meteor/app/api/server/v1/users.ts
@@ -19,6 +19,7 @@ import {
 	isUsersCheckUsernameAvailabilityParamsGET,
 	isUsersSendConfirmationEmailParamsPOST,
 } from '@rocket.chat/rest-typings';
+import { ajv } from '@rocket.chat/rest-typings/src/v1/Ajv';
 import { getLoginExpirationInMs, wrapExceptions } from '@rocket.chat/tools';
 import { Accounts } from 'meteor/accounts-base';
 import { Match, check } from 'meteor/check';
@@ -68,6 +69,7 @@ import { deleteUserOwnAccount } from '../../../lib/server/methods/deleteUserOwnA
 import { settings } from '../../../settings/server';
 import { isSMTPConfigured } from '../../../utils/server/functions/isSMTPConfigured';
 import { getURL } from '../../../utils/server/getURL';
+import type { ExtractRoutesFromAPI } from '../ApiClass';
 import { API } from '../api';
 import { getPaginationItems } from '../helpers/getPaginationItems';
 import { getUserFromParams } from '../helpers/getUserFromParams';
@@ -94,17 +96,93 @@ API.v1.addRoute(
 	},
 );
 
-API.v1.addRoute(
+const usersGetAvatarSuggestionEndpoints = API.v1.get(
 	'users.getAvatarSuggestion',
 	{
 		authRequired: true,
+		response: {
+			400: ajv.compile<{
+				error?: string;
+				errorType?: string;
+				stack?: string;
+				details?: string;
+			}>({
+				type: 'object',
+				properties: {
+					success: { type: 'boolean', enum: [false] },
+					stack: { type: 'string' },
+					error: { type: 'string' },
+					errorType: { type: 'string' },
+					details: { type: 'string' },
+				},
+				required: ['success'],
+				additionalProperties: false,
+			}),
+			401: ajv.compile({
+				type: 'object',
+				properties: {
+					success: {
+						type: 'boolean',
+						enum: [false],
+					},
+					status: { type: 'string' },
+					message: { type: 'string' },
+					error: { type: 'string' },
+					errorType: { type: 'string' },
+				},
+				required: ['success'],
+				additionalProperties: false,
+			}),
+			200: ajv.compile<{
+				suggestions: Record<
+					string,
+					{
+						blob: string;
+						contentType: string;
+						service: string;
+						url: string;
+					}
+				>;
+			}>({
+				type: 'object',
+				properties: {
+					success: {
+						type: 'boolean',
+						enum: [true],
+					},
+					suggestions: {
+						type: 'object',
+						additionalProperties: {
+							type: 'object',
+							properties: {
+								blob: {
+									type: 'string',
+								},
+								contentType: {
+									type: 'string',
+								},
+								service: {
+									type: 'string',
+								},
+								url: {
+									type: 'string',
+									format: 'uri',
+								},
+							},
+							required: ['blob', 'contentType', 'service', 'url'],
+							additionalProperties: false,
+						},
+					},
+				},
+				required: ['success', 'suggestions'],
+				additionalProperties: false,
+			}),
+		},
 	},
-	{
-		async get() {
-			const suggestions = await getAvatarSuggestionForUser(this.user);
+	async function action() {
+		const suggestions = await getAvatarSuggestionForUser(this.user);
 
-			return API.v1.success({ suggestions });
-		},
+		return API.v1.success({ suggestions });
 	},
 );
 
@@ -1424,3 +1502,12 @@ settings.watch<number>('Rate_Limiter_Limit_RegisterUser', (value) => {
 
 	API.v1.updateRateLimiterDictionaryForRoute(userRegisterRoute, value);
 });
+
+type UsersGetAvatarSuggestionEndpoints = ExtractRoutesFromAPI<typeof usersGetAvatarSuggestionEndpoints>;
+
+export type UsersEndpoints = UsersGetAvatarSuggestionEndpoints;
+
+declare module '@rocket.chat/rest-typings' {
+	// eslint-disable-next-line @typescript-eslint/naming-convention, @typescript-eslint/no-empty-interface
+	interface Endpoints extends UsersGetAvatarSuggestionEndpoints {}
+}
diff --git a/packages/rest-typings/src/v1/users.ts b/packages/rest-typings/src/v1/users.ts
index 6d4e62331bcf8..fddf1bf5c11a3 100644
--- a/packages/rest-typings/src/v1/users.ts
+++ b/packages/rest-typings/src/v1/users.ts
@@ -259,20 +259,6 @@ export type UsersEndpoints = {
 		};
 	};
 
-	'/v1/users.getAvatarSuggestion': {
-		GET: () => {
-			suggestions: Record<
-				string,
-				{
-					blob: string;
-					contentType: string;
-					service: string;
-					url: string;
-				}
-			>;
-		};
-	};
-
 	'/v1/users.checkUsernameAvailability': {
 		GET: (params: { username: string }) => {
 			result: boolean;