Admin-side architecture patterns for Webiny extensions. Use this skill when building frontend features with headless features (UseCase/Repository/Gateway), presentation features (Presenter/ViewModel/hooks/components), MobX-based presenters, RegisterFeature, and Admin BuildParams. Covers the admin/ directory structure for both features/ and presentation/ layers.

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webiny-form-model

webiny/webiny-js

Building forms with the FormModel system — field types, renderers, layout, validation, conditional rules, computed fields, and dynamic zones. Use this skill when the developer needs to define form fields with the builder API, choose renderers, build layouts with tabs/rows/separators, add validation (Zod or imperative), use conditional visibility/disable rules, create computed fields, or work with object fields and templates (dynamic zones).

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wb-preview-url-modifier

webiny/webiny-js

Covers the PreviewUrlModifier extension point in Website Builder. Use when a user wants to inject custom query parameters into live preview URLs — e.g. signed tokens, tenant identifiers, feature flags — from their Webiny project. Handles the full registration pattern: implementing the interface, wiring via createFeature + RegisterFeature, and registering via webiny.config.tsx. Supports async modifier methods (e.g. remote token fetch).

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api-bundle-size-limit

webiny/webiny-js

Covers how to configure the maximum allowed size of the Webiny API Lambda bundle using the Infra.Api.MaxBundleSize extension in webiny.config.tsx. Use when a project's API bundle exceeds the default 4.5 MB limit or when you want to enforce a stricter limit. Handles the extension syntax, byte calculations, and interpreting the build error message.

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name	webiny-api-aco-catalog
context	webiny-api
description	API — ACO — 30 abstractions. Folder event handlers and use cases.

API — ACO

Folder event handlers and use cases.

How to Use

Find the abstraction you need below
You MUST read the source file to get the exact interface and types!
Import: import { Name } from "<importPath>";
See webiny-use-case-pattern or webiny-event-handler-pattern skills for implementation patterns

Abstractions

Name: CreateFlpUseCase Import: import { CreateFlpUseCase } from "webiny/api/aco/flp" Source: @webiny/api-aco/features/flp/CreateFlp/abstractions.ts Description: Create a folder-level permission.

Name: CreateFolderRepository Import: import { CreateFolderRepository } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/CreateFolder/abstractions.ts Description: Persist a newly created folder.

Name: CreateFolderUseCase Import: import { CreateFolderUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/CreateFolder/abstractions.ts Description: Create a new folder.

Name: DeleteFlpUseCase Import: import { DeleteFlpUseCase } from "webiny/api/aco/flp" Source: @webiny/api-aco/features/flp/DeleteFlp/abstractions.ts Description: Delete a folder-level permission.

Name: DeleteFolderRepository Import: import { DeleteFolderRepository } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/DeleteFolder/abstractions.ts Description: Persist folder deletion.

Name: DeleteFolderUseCase Import: import { DeleteFolderUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/DeleteFolder/abstractions.ts Description: Delete a folder.

Name: EnsureFolderIsEmpty Import: import { EnsureFolderIsEmpty } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/EnsureFolderIsEmpty/abstractions.ts Description: Verify a folder has no children before deletion.

Name: FilterStorageOperations Import: import { FilterStorageOperations } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/shared/abstractions.ts Description: Storage operations for folder filtering.

Name: FolderAfterCreateEventHandler Import: import { FolderAfterCreateEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/CreateFolder/abstractions.ts Description: Hook into folder lifecycle after a folder is created.

Name: FolderAfterDeleteEventHandler Import: import { FolderAfterDeleteEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/DeleteFolder/abstractions.ts Description: Hook into folder lifecycle after a folder is deleted.

Name: FolderAfterGetEventHandler Import: import { FolderAfterGetEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetFolder/abstractions.ts Description: Hook into folder lifecycle after a folder is retrieved.

Name: FolderAfterUpdateEventHandler Import: import { FolderAfterUpdateEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/UpdateFolder/abstractions.ts Description: Hook into folder lifecycle after a folder is updated.

Name: FolderBeforeCreateEventHandler Import: import { FolderBeforeCreateEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/CreateFolder/abstractions.ts Description: Hook into folder lifecycle before a folder is created.

Name: FolderBeforeDeleteEventHandler Import: import { FolderBeforeDeleteEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/DeleteFolder/abstractions.ts Description: Hook into folder lifecycle before a folder is deleted.

Name: FolderBeforeGetEventHandler Import: import { FolderBeforeGetEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetFolder/abstractions.ts Description: Hook into folder lifecycle before a folder is retrieved.

Name: FolderBeforeUpdateEventHandler Import: import { FolderBeforeUpdateEventHandler } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/UpdateFolder/abstractions.ts Description: Hook into folder lifecycle before a folder is updated.

Name: FolderLevelPermissions Import: import { FolderLevelPermissions } from "webiny/api/aco/flp" Source: @webiny/api-aco/features/flp/FolderLevelPermissions/abstractions.ts Description: Manage folder-level access control.

Name: GetAncestorsRepository Import: import { GetAncestorsRepository } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetAncestors/abstractions.ts Description: Fetch ancestor folders from storage.

Name: GetAncestorsUseCase Import: import { GetAncestorsUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetAncestors/abstractions.ts Description: Retrieve ancestor folders in the hierarchy.

Name: GetFlpUseCase Import: import { GetFlpUseCase } from "webiny/api/aco/flp" Source: @webiny/api-aco/features/flp/GetFlp/abstractions.ts Description: Retrieve a folder-level permission.

Name: GetFolderHierarchyRepository Import: import { GetFolderHierarchyRepository } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetFolderHierarchy/abstractions.ts Description: Fetch folder hierarchy from storage.

Name: GetFolderHierarchyUseCase Import: import { GetFolderHierarchyUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetFolderHierarchy/abstractions.ts Description: Retrieve the full folder hierarchy.

Name: GetFolderUseCase Import: import { GetFolderUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/GetFolder/abstractions.ts Description: Retrieve a folder.

Name: ListFlpsUseCase Import: import { ListFlpsUseCase } from "webiny/api/aco/flp" Source: @webiny/api-aco/features/flp/ListFlps/abstractions.ts Description: List folder-level permissions.

Name: ListFolderLevelPermissionsTargetsUseCase Import: import { ListFolderLevelPermissionsTargetsUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/ListFolderLevelPermissionsTargets/abstractions.ts Description: List targets for folder-level permissions.

Name: ListFoldersRepository Import: import { ListFoldersRepository } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/ListFolders/abstractions.ts Description: Fetch folders from storage.

Name: ListFoldersUseCase Import: import { ListFoldersUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/ListFolders/abstractions.ts Description: List folders with filtering.

Name: UpdateFlpUseCase Import: import { UpdateFlpUseCase } from "webiny/api/aco/flp" Source: @webiny/api-aco/features/flp/UpdateFlp/abstractions.ts Description: Update a folder-level permission.

Name: UpdateFolderRepository Import: import { UpdateFolderRepository } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/UpdateFolder/abstractions.ts Description: Persist folder updates.

Name: UpdateFolderUseCase Import: import { UpdateFolderUseCase } from "webiny/api/aco/folder" Source: @webiny/api-aco/features/folder/UpdateFolder/abstractions.ts Description: Update a folder.