feat(core): Allow filtering workflows by availableInMCP (#18646)

packages/@n8n/db/src/repositories/workflow.repository.ts

@@ -435,6 +435,30 @@ export class WorkflowRepository extends Repository<WorkflowEntity> {
 		this.applyTagsFilter(qb, filter);
 		this.applyProjectFilter(qb, filter);
 		this.applyParentFolderFilter(qb, filter);
+		this.applyAvailableInMCPFilter(qb, filter);
+	}
+
+	private applyAvailableInMCPFilter(
+		qb: SelectQueryBuilder<WorkflowEntity>,
+		filter: ListQuery.Options['filter'],
+	): void {
+		if (typeof filter?.availableInMCP === 'boolean') {
+			const dbType = this.globalConfig.database.type;
+
+			if (['postgresdb'].includes(dbType)) {
+				qb.andWhere("workflow.settings ->> 'availableInMCP' = :availableInMCP", {
+					availableInMCP: filter.availableInMCP.toString(),
+				});
+			} else if (['mysqldb', 'mariadb'].includes(dbType)) {
+				qb.andWhere("JSON_EXTRACT(workflow.settings, '$.availableInMCP') = :availableInMCP", {
+					availableInMCP: filter.availableInMCP,
+				});
+			} else if (dbType === 'sqlite') {
+				qb.andWhere("JSON_EXTRACT(workflow.settings, '$.availableInMCP') = :availableInMCP", {
+					availableInMCP: filter.availableInMCP ? 1 : 0, // SQLite stores booleans as 0/1
+				});
+			}
+		}
 	}
 
 	private applyNameFilter(

packages/cli/src/middlewares/list-query/dtos/workflow.filter.dto.ts

@@ -35,6 +35,11 @@ export class WorkflowFilter extends BaseFilter {
 	@Expose()
 	parentFolderId?: string;
 
+	@IsBoolean()
+	@IsOptional()
+	@Expose()
+	availableInMCP?: boolean;
+
 	static async fromString(rawFilter: string) {
 		return await this.toFilter(rawFilter, WorkflowFilter);
 	}

packages/cli/src/workflows/workflow.request.ts

@@ -53,6 +53,7 @@ export declare namespace WorkflowRequest {
 			includeScopes?: string;
 			includeFolders?: string;
 			onlySharedWithMe?: string;
+			availableInMCP?: string;
 		}
 	> & {
 		listQueryOptions: ListQuery.Options;

packages/cli/test/integration/workflows/workflows.controller.test.ts

@@ -859,6 +859,21 @@ describe('GET /workflows', () => {
 			});
 		});
 
+		test('should filter workflows by field: availableInMCP', async () => {
+			const workflow1 = await createWorkflow({ settings: { availableInMCP: true } }, owner);
+			await createWorkflow({ settings: {} }, owner);
+
+			const response = await authOwnerAgent
+				.get('/workflows')
+				.query('filter={ "availableInMCP": true }')
+				.expect(200);
+
+			expect(response.body).toEqual({
+				count: 1,
+				data: [objectContaining({ id: workflow1.id })],
+			});
+		});
+
 		test('should filter workflows by field: tags (AND operator)', async () => {
 			const workflow1 = await createWorkflow({ name: 'First' }, owner);
 			const workflow2 = await createWorkflow({ name: 'Second' }, owner);

packages/workflow/src/interfaces.ts

@@ -2604,6 +2604,7 @@ export interface IWorkflowSettings {
 	executionTimeout?: number;
 	executionOrder?: 'v0' | 'v1';
 	timeSavedPerExecution?: number;
+	availableInMCP?: boolean;
 }
 
 export interface WorkflowFEMeta {