Angular Developer

Angular (Google)OfficialCreated by Google LLCDistributed by Angular (Google)

Skill
Tool integration
Software development
MIT
No issues found

From the author

Generates Angular code and provides architectural guidance. Trigger when creating projects, components, services, or HTTP communication, or for best practices on reactivity (signals, linkedSignal, resource, httpResource), queries and content projection, forms, dependency injection, routing, server and hybrid rendering (SSR, prerendering, hydration), accessibility (ARIA), animations, styling (component styles, Tailwind CSS), testing, naming conventions, or CLI tooling.

— the description by Google LLC

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The Angular Developer skill assists in building and maintaining Angular applications. It provides structured guidance on project scaffolding, component architecture, state management with signals, HTTP communication, and accessibility. It emphasizes the use of the Angular CLI for consistency and mandates build verification to ensure code quality. The skill covers modern Angular features including signal-based reactivity, deferrable views, and headless accessibility components via Angular Aria.

What it does

Generates boilerplate code for components, services, and routes using the Angular CLI.
Provides architectural advice on state management using signals, linked signals, and resources.
Offers guidance on implementing accessible UI patterns using Angular Aria directives.
Advises on modern rendering strategies including SSR, prerendering, and hydration.
Ensures code quality by requiring build verification after generation.
Recommends modern naming conventions and styling approaches like Tailwind CSS.

When to use it

When scaffolding a new Angular project or adding new features to an existing one.
When needing to implement complex state management or asynchronous data fetching.
When building accessible custom components like accordions, listboxes, or comboboxes.
When refactoring older code to modern Angular standards or migrating to newer versions.
When troubleshooting build errors or optimizing component performance.

Advantages

Promotes consistency by enforcing Angular CLI usage and standard naming conventions.
Reduces technical debt by prioritizing modern signal-based reactivity and form management.
Improves accessibility by integrating headless ARIA patterns.
Ensures functional reliability through mandatory build verification steps.
Provides context-aware guidance based on the specific Angular version of the project.

Usage examples

“Create a new Angular component for a user profile with signal-based inputs.”: The agent generates the component structure using the Angular CLI, implementing signal-based inputs as per the latest framework standards.
“How do I implement an accessible accordion in my Angular application?”: The agent provides the necessary imports from the Angular Aria package and demonstrates the correct HTML structure using the required directives.
“Help me refactor my legacy animation code to the modern approach.”: The agent analyzes the project version and provides a guide on transitioning to native CSS animations using the recommended enter and leave classes.
“What is the best way to fetch data in a component using signals?”: The agent explains the use of the resource API for asynchronous data fetching and provides a code example for integrating it into the component.

Install

Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/angular/angular-developer/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip angular-developer.zip -d .agents/skills

Documentation by Google LLC

Angular Developer Guidelines

Always analyze the project's Angular version before providing guidance, as best practices and available features can vary significantly between versions. If creating a new project with Angular CLI, do not specify a version unless prompted by the user.
When generating code, follow Angular's style guide and best practices for maintainability and performance. Use the Angular CLI for scaffolding components, services, directives, pipes, and routes to ensure consistency.
Once you finish generating code, run ng build to ensure there are no build errors. If there are errors, analyze the error messages and fix them before proceeding. Do not skip this step, as it is critical for ensuring the generated code is correct and functional.

Creating New Projects

If no guidelines are provided by the user, here are some default rules to follow when creating a new Angular project:

Use the latest stable version of Angular unless the user specifies otherwise.
Use Signal Forms for form management in new projects (stable in Angular v22 and newer) Find out more.

Execution Rules for ng new: When asked to create a new Angular project, you must determine the correct execution command by following these strict steps:

Step 1: Check for an explicit user version.

IF the user requests a specific version (e.g., Angular 15), bypass local installations and strictly use npx.
Command: npx @angular/cli@<requested_version> new <project-name>

Step 2: Check for an existing Angular installation.

IF no specific version is requested, run ng version in the terminal to check if the Angular CLI is already installed on the system.
IF the command succeeds and returns an installed version, use the local/global installation directly.
Command: ng new <project-name>

Step 3: Fallback to Latest.

IF no specific version is requested AND the ng version command fails (indicating no Angular installation exists), you must use npx to fetch the latest version.
Command: npx @angular/cli@latest new <project-name>

Components

When working with Angular components, consult the following references based on the task:

Fundamentals: Anatomy, metadata, core concepts, self-closing tags, and template control flow (@if, @for, @switch). Read components.md
Inputs: Signal-based inputs, transforms, and model inputs. Read inputs.md
Outputs: Signal-based outputs and custom event best practices. Read outputs.md
Host Elements: Host bindings and attribute injection. Read host-elements.md
Naming Conventions: Modern Angular v20+ naming style ("Intent over Role") for files, components, services, directives, pipes, and models. Read naming-conventions.md
Queries and Content Projection: Signal-based view and content queries (viewChild, viewChildren, contentChild, contentChildren) and content projection with <ng-content> slots and fallback content. Read queries-and-projection.md
Deferrable Views: Lazy loading, code splitting, triggers, prefetching, loading states, SSR, and layout stability with @defer. Read deferrable-views.md

If you require deeper documentation not found in the references above, read the documentation at https://angular.dev/guide/components.

Reactivity and Data Management

When managing state and data reactivity, use Angular Signals and consult the following references:

Signals Overview: Core signal concepts (signal, computed), reactive contexts, and untracked. Read signals-overview.md
Dependent State (linkedSignal): Creating writable state linked to source signals. Read linked-signal.md
Async Reactivity (resource): Fetching asynchronous data directly into signal state. Read resource.md
Side Effects (effect): Logging, third-party DOM manipulation (afterRenderEffect), and when NOT to use effects. Read effects.md

HTTP Communication

When communicating with backend services, use Angular HTTP APIs and consult the following reference:

HTTP Client and Resources: provideHttpClient, HttpClient, interceptors, and httpResource. Read http-client.md

Forms

In most cases for new apps, prefer signal forms. When making a forms decision, analyze the project and consider the following guidelines:

If the application is using v22 or newer and this is a new form, prefer Signal Forms.
For older applications or when working with existing forms, use the appropriate form type that matches the applications current form strategy.
Signal Forms: Use signals for form state management. Read signal-forms.md
Template-driven forms: Use for simple forms. Read template-driven-forms.md
Reactive forms: Use for complex forms. Read reactive-forms.md

Dependency Injection

When implementing dependency injection in Angular, follow these guidelines:

Fundamentals: Overview of Dependency Injection, services, and the inject() function. Read di-fundamentals.md
Creating and Using Services: Creating services, the providedIn: 'root' option, and injecting into components or other services. Read creating-services.md
Defining Dependency Providers: Automatic vs manual provision, InjectionToken, useClass, useValue, useFactory, and scopes. Read defining-providers.md
Injection Context: Where inject() is allowed, runInInjectionContext, and assertInInjectionContext. Read injection-context.md
Hierarchical Injectors: The EnvironmentInjector vs ElementInjector, resolution rules, modifiers (optional, skipSelf), and providers vs viewProviders. Read hierarchical-injectors.md

Pipes

When formatting values in templates, creating custom pipes, or reusing pipe-like logic in TypeScript, consult the following reference. Prefer pipes in templates; outside templates, avoid injecting pipe classes just to call transform().

Pipes: Built-in pipe imports, custom pipe naming and implementation, pure vs impure pipes, and TypeScript reuse patterns using standalone formatting functions or extracted plain functions. Read pipes.md

Angular Aria

When building accessible custom components for any of the following patterns: Accordion, Listbox, Combobox, Menu, Tabs, Toolbar, Tree, Grid, consult the following reference:

Angular Aria Components: Building headless, accessible components (Accordion, Listbox, Combobox, Menu, Tabs, Toolbar, Tree, Grid) and styling ARIA attributes. Read angular-aria.md

Routing

When implementing navigation in Angular, consult the following references:

Define Routes: URL paths, static vs dynamic segments, wildcards, and redirects. Read define-routes.md
Route Loading Strategies: Eager vs lazy loading, and context-aware loading. Read loading-strategies.md
Show Routes with Outlets: Using <router-outlet>, nested outlets, and named outlets. Read show-routes-with-outlets.md
Navigate to Routes: Declarative navigation with RouterLink and programmatic navigation with Router. Read navigate-to-routes.md
Control Route Access with Guards: Implementing CanActivate, CanMatch, and other guards for security. Read route-guards.md
Data Resolvers: Pre-fetching data before route activation with ResolveFn. Read data-resolvers.md
Router Lifecycle and Events: Chronological order of navigation events and debugging. Read router-lifecycle.md
Rendering Strategies: Choosing between CSR, SSG (prerendering), and SSR. Read rendering-strategies.md
Server and Hybrid Rendering: Implementing server routes, prerendering, hydration, server-compatible code, and request data in an SSR-configured app. Read server-side-rendering.md
Route Transition Animations: Enabling and customizing the View Transitions API. Read route-animations.md

If you require deeper documentation or more context, visit the official Angular Routing guide.

Styling and Animations

When implementing styling and animations in Angular, consult the following references:

Using Tailwind CSS with Angular: Integrating Tailwind CSS into Angular projects. Read tailwind-css.md
Angular Animations: Using native CSS (recommended) or the legacy DSL for dynamic effects. Read angular-animations.md
Styling components: Best practices for component styles and encapsulation. Read component-styling.md

Testing

When writing or updating tests, consult the following references based on the task:

Fundamentals: Best practices for unit testing (Vitest), async patterns, and TestBed. Read testing-fundamentals.md
Component Harnesses: Standard patterns for robust component interaction. Read component-harnesses.md
Router Testing: Using RouterTestingHarness for reliable navigation tests. Read router-testing.md
End-to-End (E2E) Testing: Setting up and running E2E tests. Read e2e-testing.md

Tooling

When working with Angular tooling, consult the following references:

Angular CLI: Creating applications, generating code (components, routes, services), serving, and building. Read cli.md
Code Modernization: Automatically refactoring to modern standards using migrations. Read migrations.md
Angular MCP Server: Available tools, configuration, and experimental features. Read mcp.md
Environment Configuration: Strategies for build-time and runtime configuration. Read environment-configuration.md

Files

ATTRIBUTION.mdAdded by AutoGineer853 B
SKILL.md11.2 KiB
references/angular-animations.md3.9 KiB
references/angular-aria.md18.2 KiB
references/cli.md3.6 KiB
references/component-harnesses.md2.7 KiB
references/component-styling.md2.5 KiB
references/components.md4.8 KiB
references/creating-services.md3.2 KiB
references/data-resolvers.md1.6 KiB
references/deferrable-views.md2.7 KiB
references/define-routes.md2.1 KiB
references/defining-providers.md2.2 KiB
references/di-fundamentals.md3.4 KiB
references/e2e-testing.md884 B
references/effects.md2.7 KiB
references/environment-configuration.md3.3 KiB
references/hierarchical-injectors.md2.1 KiB
references/host-elements.md2.1 KiB
references/http-client.md5.4 KiB
references/injection-context.md1.9 KiB
references/inputs.md2.4 KiB
references/linked-signal.md3.3 KiB
references/loading-strategies.md1.5 KiB
references/mcp.md3.2 KiB
references/migrations.md2.0 KiB
references/naming-conventions.md5.4 KiB
references/navigate-to-routes.md1.6 KiB
references/outputs.md2.6 KiB
references/pipes.md3.8 KiB
references/queries-and-projection.md9.0 KiB
references/reactive-forms.md3.5 KiB
references/rendering-strategies.md1.8 KiB
references/resource.md3.9 KiB
references/route-animations.md1.6 KiB
references/route-guards.md1.8 KiB
references/router-lifecycle.md1.5 KiB
references/router-testing.md3.7 KiB
references/server-side-rendering.md4.5 KiB
references/show-routes-with-outlets.md1.6 KiB
references/signal-forms.md27.2 KiB
references/signals-overview.md2.8 KiB
references/tailwind-css.md1.8 KiB
references/template-driven-forms.md3.7 KiB
references/testing-fundamentals.md2.7 KiB

references/effects.md

Side Effects with `effect` and `afterRenderEffect`

In Angular, an effect is an operation that runs whenever one or more signal values it tracks change.

When to use `effect`

Effects are intended for syncing signal state to imperative, non-signal APIs.

Valid Use Cases:

Logging analytics.
Syncing state to localStorage or sessionStorage.
Performing custom rendering to a <canvas> or 3rd-party charting library.

CRITICAL RULE: DO NOT use effects to propagate state. If you find yourself using .set() or .update() on a signal inside an effect to keep two signals in sync, you are making a mistake. This causes ExpressionChangedAfterItHasBeenChecked errors and infinite loops. Always use computed() or linkedSignal() for state derivation.

Basic Usage

Effects execute asynchronously during the change detection process. They always run at least once.

import { Component, signal, effect } from '@angular/core';

@Component({...})
export class Example {
  protected readonly count = signal(0);

  constructor() {
    // Effect must be created in an injection context (e.g., a constructor)
    effect((onCleanup) => {
      console.log(`Count changed to ${this.count()}`);

      const timer = setTimeout(() => console.log('Timer finished'), 1000);

      // Cleanup function runs before the next execution, or when destroyed
      onCleanup(() => clearTimeout(timer));
    });
  }
}

DOM Manipulation with `afterRenderEffect`

Standard effect runs before Angular updates the DOM. If you need to manually inspect or modify the DOM based on a signal change (e.g., integrating a 3rd party UI library), use afterRenderEffect.

afterRenderEffect runs after Angular has finished rendering the DOM.

Render Phases

To prevent reflows (forced layout thrashing), afterRenderEffect forces you to divide your DOM reads and writes into specific phases.

import { Component, afterRenderEffect, viewChild, ElementRef } from '@angular/core';

@Component({...})
export class Chart {
  canvas = viewChild.required<ElementRef<HTMLCanvasElement>>('canvas');

  constructor() {
    afterRenderEffect({
      // 1. Read from the DOM
      earlyRead: () => {
        return this.canvas().nativeElement.getBoundingClientRect().width;
      },
      // 2. Write to the DOM (receives the previous phase result as a Signal)
      write: (width) => {
        // NEVER read from the DOM in the write phase.
        setupChart(this.canvas().nativeElement, width());
      }
    });
  }
}

Available Phases (executed in this order):

earlyRead
write (Never read here)
mixedReadWrite (Avoid if possible)
read (Never write here)

Note: afterRenderEffect only runs on the client, never during Server-Side Rendering (SSR).

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs an MCP server, Needs Node.js

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by

Google LLC

Publisher

Angular (Google) (Official)

Distributed by

Angular (Google)

Source

angular/skills · angular-developer · commit 9274c6e

Licence

MIT License (redistribution allowed)

ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-08

AutoGineer is not affiliated with or endorsed by Google LLC or Angular (Google).

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download angular-developer.zip