diff --git a/apps/meteor/app/slashcommands-join/client/client.ts b/apps/meteor/app/slashcommands-join/client/client.ts
index 3fb1ac1c949d..fcf56d6e55a6 100644
--- a/apps/meteor/app/slashcommands-join/client/client.ts
+++ b/apps/meteor/app/slashcommands-join/client/client.ts
@@ -10,8 +10,8 @@ slashCommands.add(
 		params: '#channel',
 		permission: 'view-c-room',
 	},
-	function (err: Meteor.Error, _result: unknown, params: Record<string, any>) {
-		if (err.error === 'error-user-already-in-room') {
+	function (err, _result: unknown, params: Record<string, any>) {
+		if ((err as Meteor.Error).error === 'error-user-already-in-room') {
 			params.cmd = 'open';
 			params.msg.msg = params.msg.msg.replace('join', 'open');
 			return slashCommands.run('open', params.params, params.msg, '');
diff --git a/packages/core-typings/src/SlashCommands/index.ts b/packages/core-typings/src/SlashCommands/index.ts
index b8e0d5d9a7f9..928d34008c5e 100644
--- a/packages/core-typings/src/SlashCommands/index.ts
+++ b/packages/core-typings/src/SlashCommands/index.ts
@@ -43,7 +43,7 @@ export type SlashCommand<T extends string = string> = {
 	description: SlashCommandOptions['description'];
 	permission: SlashCommandOptions['permission'];
 	clientOnly?: SlashCommandOptions['clientOnly'];
-	result?: (err: Meteor.Error, result: never, data: { cmd: string; params: string; msg: IMessage }) => void;
+	result?: (err: unknown, result: never, data: { cmd: string; params: string; msg: IMessage }) => void;
 	providesPreview: boolean;
 	previewer?: SlashCommandPreviewer;
 	previewCallback?: SlashCommandPreviewCallback;
diff --git a/packages/rest-typings/src/v1/commands.ts b/packages/rest-typings/src/v1/commands.ts
index 32e14b1c0393..aec14e57c669 100644
--- a/packages/rest-typings/src/v1/commands.ts
+++ b/packages/rest-typings/src/v1/commands.ts
@@ -5,7 +5,7 @@ import type { PaginatedResult } from '../helpers/PaginatedResult';
 export type CommandsEndpoints = {
 	'commands.get': {
 		GET: (params: { command: string }) => {
-			command: SlashCommand;
+			command: Pick<SlashCommand, 'clientOnly' | 'command' | 'description' | 'params' | 'providesPreview'>;
 		};
 	};
 	'commands.list': {
@@ -14,7 +14,7 @@ export type CommandsEndpoints = {
 				fields?: string;
 			}>,
 		) => PaginatedResult<{
-			commands: SlashCommand[];
+			commands: Pick<SlashCommand, 'clientOnly' | 'command' | 'description' | 'params' | 'providesPreview'>[];
 		}>;
 	};
 	'commands.run': {