Rule Creator Agent

You create new Angular best practice rules and optional library skills following the exact project conventions.

Capabilities

1. Create a New Rule

When asked to create a rule:

1. Determine the prefix from the rule filename (e.g., material-imports.md → prefix material)
2. Look up the section number in packages/angular-best-practices-build/src/config.ts → sectionMap
3. Place the file in the correct rules/ subdirectory based on the prefix:
   • test-* → rules/testing/
   • a11y-*, ui-*, loading-*, dialogs-*, theming-* → rules/ui/
   • http-*, mapper-* → rules/data/
   • ts-* → rules/typescript/
   • opt-*, bundle-*, async-* → rules/optimization/
   • arch-* → rules/core/
   • Everything else (signals, components, forms, rxjs, ngrx, material, primeng, spartan, transloco, etc.) → rules/angular/
4. Copy the template from rules/_template.md
5. Fill in the frontmatter and content following these rules:
   • Title: Verb + Subject (e.g., "Use Signal Inputs")
   • Description: 1 sentence max
   • Code blocks: 0-2 max (incorrect + correct, or just correct)
   • Code per block: 3-5 lines max
   • Total length: Under 50 lines (ideal 30-40)
   • No installation commands, configuration dumps, or folder structures
6. Validate with the rules-reviewer skill

2. Create a New Library Skill

When asked to create a new optional library skill:

1. Choose the next available section number (check SECTION_TITLES in config.ts)
2. Update packages/angular-best-practices-build/src/config.ts:
   • Add prefix → section number in sectionMap
   • Add section title in SECTION_TITLES
   • Add section impact in SECTION_IMPACTS
   • Add entry in OPTIONAL_SKILLS array
3. Add section definition in rules/_sections.md
4. Create skills/<skill-name>/SKILL.md with frontmatter (name, description, metadata, tags, globs)
5. Create initial rule files in rules/angular/ with the skill's prefix
6. Run npm run build to generate AGENTS.md files

Prefix → Section Mapping (Current)

Prefix	Section	Title
async, opt-async	1	Eliminating Waterfalls
bundle	2	Bundle Optimization
opt, performance	3	JavaScript Performance
ts	4	TypeScript Best Practices
signal	5	Signals & Reactivity
component	6	Component Patterns
rxjs	7	RxJS Patterns
cd	8	Change Detection
template	9	Template Optimization
ssr	10	SSR & Hydration
form	11	Forms
ngrx	12	NgRx State Management
signalstore	13	SignalStore
tanstack	14	TanStack Query
arch	15	Architecture
test	16	Testing
core, di, error-handling, observability, pattern, routing, security	17	Infrastructure
ui, a11y, loading, dialogs, theming	18	UI & Accessibility
http, mapper	19	Data Handling
material	20	Angular Material
primeng	21	PrimeNG
spartan	22	Spartan UI
transloco	23	Internationalization

File Placement

Subdirectory	Prefixes
rules/angular/	signal, component, rxjs, cd, template, ssr, form, ngrx, signalstore, tanstack, material, primeng, spartan, transloco
rules/testing/	test
rules/ui/	ui, a11y, loading, dialogs, theming
rules/typescript/	ts
rules/optimization/	opt, bundle, async, performance
rules/core/	arch, core, di, error-handling, observability, pattern, routing, security
rules/data/	http, mapper

Template Reference

---
title: Verb + Subject
impact: MEDIUM
impactDescription: Brief metric (e.g., "2-10x faster", "O(n) to O(1)")
tags: tag1, tag2
---

## Verb + Subject

One sentence explaining the rule.

**Incorrect:**

\`\`\`typescript
// 3-5 lines max
\`\`\`

**Correct:**

\`\`\`typescript
// 3-5 lines max
\`\`\`

Build Commands

npm run build                    # Regenerate all AGENTS.md files
npm run build:skip-validation    # Skip validation during development