diff --git a/.changeset/migrate-chat-getDiscussions-to-openapi.md b/.changeset/migrate-chat-getDiscussions-to-openapi.md
new file mode 100644
index 0000000000000..2d63aec428b78
--- /dev/null
+++ b/.changeset/migrate-chat-getDiscussions-to-openapi.md
@@ -0,0 +1,6 @@
+---
+'@rocket.chat/meteor': minor
+'@rocket.chat/rest-typings': minor
+---
+
+Migrated chat.getDiscussions endpoint to new OpenAPI pattern with AJV validation
diff --git a/apps/meteor/app/api/server/v1/chat.ts b/apps/meteor/app/api/server/v1/chat.ts
index a00d57e46ae72..d33dffcde99b2 100644
--- a/apps/meteor/app/api/server/v1/chat.ts
+++ b/apps/meteor/app/api/server/v1/chat.ts
@@ -1,5 +1,5 @@
 import { Message } from '@rocket.chat/core-services';
-import type { IMessage, IThreadMainMessage } from '@rocket.chat/core-typings';
+import type { IMessage, IThreadMainMessage, IRoom } from '@rocket.chat/core-typings';
 import { MessageTypes } from '@rocket.chat/message-types';
 import { Messages, Users, Rooms, Subscriptions } from '@rocket.chat/models';
 import {
@@ -23,9 +23,9 @@ import {
 	isChatGetThreadMessagesProps,
 	isChatSyncThreadMessagesProps,
 	isChatGetStarredMessagesProps,
-	isChatGetDiscussionsProps,
 	validateBadRequestErrorResponse,
 	validateUnauthorizedErrorResponse,
+	type PaginatedRequest,
 } from '@rocket.chat/rest-typings';
 import { escapeRegExp } from '@rocket.chat/string-helpers';
 import { Meteor } from 'meteor/meteor';
@@ -275,6 +275,41 @@ const isChatPinMessageProps = ajv.compile<ChatPinMessage>(ChatPinMessageSchema);
 
 const isChatUnpinMessageProps = ajv.compile<ChatUnpinMessage>(ChatUnpinMessageSchema);
 
+type ChatGetDiscussions = PaginatedRequest<{
+	roomId: IRoom['_id'];
+	text?: string;
+}>;
+
+const ChatGetDiscussionsSchema = {
+	type: 'object',
+	properties: {
+		roomId: {
+			type: 'string',
+			minLength: 1,
+		},
+		text: {
+			type: 'string',
+		},
+		offset: {
+			type: 'number',
+		},
+		count: {
+			type: 'number',
+		},
+		sort: {
+			type: 'string',
+		},
+		query: {
+			type: 'string',
+			nullable: true,
+		},
+	},
+	required: ['roomId'],
+	additionalProperties: false,
+};
+
+const isChatGetDiscussionsLocalProps = ajv.compile<ChatGetDiscussions>(ChatGetDiscussionsSchema);
+
 const chatEndpoints = API.v1
 	.post(
 		'chat.pinMessage',
@@ -558,6 +593,55 @@ const chatEndpoints = API.v1
 
 			return API.v1.success();
 		},
+	)
+	.get(
+		'chat.getDiscussions',
+		{
+			authRequired: true,
+			query: isChatGetDiscussionsLocalProps,
+			response: {
+				200: ajv.compile<{
+					messages: IMessage[];
+					count: number;
+					offset: number;
+					total: number;
+					success: boolean;
+				}>({
+					type: 'object',
+					properties: {
+						messages: {
+							type: 'array',
+							items: { $ref: '#/components/schemas/IMessage' },
+						},
+						count: { type: 'number' },
+						offset: { type: 'number' },
+						total: { type: 'number' },
+						success: { type: 'boolean', enum: [true] },
+					},
+					required: ['messages', 'count', 'offset', 'total', 'success'],
+					additionalProperties: false,
+				}),
+				400: validateBadRequestErrorResponse,
+				401: validateUnauthorizedErrorResponse,
+			},
+		},
+		async function action() {
+			const { roomId, text } = this.queryParams;
+			const { sort } = await this.parseJsonQuery();
+			const { offset, count } = await getPaginationItems(this.queryParams);
+
+			const messages = await findDiscussionsFromRoom({
+				uid: this.userId,
+				roomId,
+				text: text || '',
+				pagination: {
+					offset,
+					count,
+					sort,
+				},
+			});
+			return API.v1.success(messages);
+		},
 	);
 
 API.v1.addRoute(
@@ -1007,30 +1091,6 @@ API.v1.addRoute(
 	},
 );
 
-API.v1.addRoute(
-	'chat.getDiscussions',
-	{ authRequired: true, validateParams: isChatGetDiscussionsProps },
-	{
-		async get() {
-			const { roomId, text } = this.queryParams;
-			const { sort } = await this.parseJsonQuery();
-			const { offset, count } = await getPaginationItems(this.queryParams);
-
-			const messages = await findDiscussionsFromRoom({
-				uid: this.userId,
-				roomId,
-				text: text || '',
-				pagination: {
-					offset,
-					count,
-					sort,
-				},
-			});
-			return API.v1.success(messages);
-		},
-	},
-);
-
 API.v1.addRoute(
 	'chat.getURLPreview',
 	{ authRequired: true, validateParams: isChatGetURLPreviewProps },
diff --git a/packages/rest-typings/src/v1/chat.ts b/packages/rest-typings/src/v1/chat.ts
index b52bba2d61ed5..387ee937de140 100644
--- a/packages/rest-typings/src/v1/chat.ts
+++ b/packages/rest-typings/src/v1/chat.ts
@@ -97,34 +97,6 @@ const ChatGetMessageSchema = {
 
 export const isChatGetMessageProps = ajv.compile<ChatGetMessage>(ChatGetMessageSchema);
 
-type ChatGetDiscussions = PaginatedRequest<{
-	roomId: IRoom['_id'];
-	text?: string;
-}>;
-
-const ChatGetDiscussionsSchema = {
-	type: 'object',
-	properties: {
-		roomId: {
-			type: 'string',
-			minLength: 1,
-		},
-		text: {
-			type: 'string',
-		},
-		offset: {
-			type: 'number',
-		},
-		count: {
-			type: 'number',
-		},
-	},
-	required: ['roomId'],
-	additionalProperties: false,
-};
-
-export const isChatGetDiscussionsProps = ajv.compile<ChatGetDiscussions>(ChatGetDiscussionsSchema);
-
 type ChatReportMessage = {
 	messageId: IMessage['_id'];
 	description: string;
@@ -900,12 +872,6 @@ export type ChatEndpoints = {
 	'/v1/chat.reportMessage': {
 		POST: (params: ChatReportMessage) => void;
 	};
-	'/v1/chat.getDiscussions': {
-		GET: (params: ChatGetDiscussions) => {
-			messages: IMessage[];
-			total: number;
-		};
-	};
 	'/v1/chat.getThreadsList': {
 		GET: (params: ChatGetThreadsList) => {
 			threads: IThreadMainMessage[];