diff --git a/packages/backend/src/server/api/endpoints/notes/children.ts b/packages/backend/src/server/api/endpoints/notes/children.ts
index 9047fcce1..dc536df62 100644
--- a/packages/backend/src/server/api/endpoints/notes/children.ts
+++ b/packages/backend/src/server/api/endpoints/notes/children.ts
@@ -1,4 +1,3 @@
-import { Brackets } from "typeorm";
 import { Notes } from "@/models/index.js";
 import define from "../../define.js";
 import { makePaginationQuery } from "../../common/make-pagination-query.js";
@@ -23,13 +22,14 @@ export const meta = {
 			ref: "Note",
 		},
 	},
-};
+} as const;
 
 export const paramDef = {
 	type: "object",
 	properties: {
 		noteId: { type: "string", format: "misskey:id" },
 		limit: { type: "integer", minimum: 1, maximum: 100, default: 10 },
+		depth: { type: "integer", minimum: 1, maximum: 100, default: 12},
 		sinceId: { type: "string", format: "misskey:id" },
 		untilId: { type: "string", format: "misskey:id" },
 	},
diff --git a/packages/backend/src/server/api/endpoints/notes/conversation.ts b/packages/backend/src/server/api/endpoints/notes/conversation.ts
index 2e8f5ef73..47c672736 100644
--- a/packages/backend/src/server/api/endpoints/notes/conversation.ts
+++ b/packages/backend/src/server/api/endpoints/notes/conversation.ts
@@ -51,7 +51,7 @@ export default define(meta, paramDef, async (ps, user) => {
 	const conversation: Note[] = [];
 	let i = 0;
 
-	async function get(id: any) {
+	async function get(id: string) {
 		i++;
 		const p = await getNote(id, user).catch((e) => {
 			if (e.id === "9725d0ce-ba28-4dde-95a7-2cbb2c15de24") return null;
@@ -60,7 +60,7 @@ export default define(meta, paramDef, async (ps, user) => {
 
 		if (p == null) return;
 
-		if (i > ps.offset!) {
+		if (i > ps.offset) {
 			conversation.push(p);
 		}