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angular-modern-apis

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Guidelines for using modern Angular APIs (signals, inject, control flow)

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/mgechev/skillgrade/blob/HEAD/examples/angular-modern/SKILL.md

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Angular Modern APIs

This skill describes the mandatory coding standards for Angular components in our codebase.

Rules

All Angular components must follow these rules:

  1. Use signal-based inputs — Use input() and output() instead of @Input() and @Output() decorators
  2. Use inject() for DI — Use inject() function instead of constructor parameter injection
  3. Use built-in control flow — Use @if, @for, @switch instead of *ngIf, *ngFor, *ngSwitch

Examples

Signal inputs (correct)

import { Component, input, output } from '@angular/core';

@Component({ ... })
export class UserProfileComponent {
  name = input.required<string>();
  age = input(0);
  saved = output<void>();
}

inject() for DI (correct)

import { Component, inject } from '@angular/core';
import { UserService } from './user.service';

@Component({ ... })
export class UserProfileComponent {
  private userService = inject(UserService);
}

Built-in control flow (correct)

@if (user()) {
  <h1>{{ user().name }}</h1>
} @else {
  <p>No user found</p>
}

@for (item of items(); track item.id) {
  <li>{{ item.name }}</li>
}