vercel-composition-patterns

SKILL.md

React Composition Patterns

Composition patterns for building flexible, maintainable React components. Avoid
boolean prop proliferation by using compound components, lifting state, and
composing internals. These patterns make codebases easier for both humans and AI
agents to work with as they scale.

When to Apply

Reference these guidelines when:

Refactoring components with many boolean props

Building reusable component libraries

Designing flexible component APIs

Reviewing component architecture

Working with compound components or context providers

Rule Categories by Priority

Priority
Category
Impact
Prefix

1
Component Architecture
HIGH
architecture-

2
State Management
MEDIUM
state-

3
Implementation Patterns
MEDIUM
patterns-

4
React 19 APIs
MEDIUM
react19-

Quick Reference

1. Component Architecture (HIGH)

architecture-avoid-boolean-props - Don't add boolean props to customize
behavior; use composition

architecture-compound-components - Structure complex components with shared
context

2. State Management (MEDIUM)

state-decouple-implementation - Provider is the only place that knows how
state is managed

state-context-interface - Define generic interface with state, actions, meta
for dependency injection

state-lift-state - Move state into provider components for sibling access

3. Implementation Patterns (MEDIUM)

patterns-explicit-variants - Create explicit variant components instead of
boolean modes

patterns-children-over-render-props - Use children for composition instead
of renderX props

4. React 19 APIs (MEDIUM)

⚠️ React 19+ only. Skip this section if using React 18 or earlier.

react19-no-forwardref - Don't use forwardRef; use use() instead of useContext()

How to Use

Read individual rule files for detailed explanations and code examples:

rules/architecture-avoid-boolean-props.md
rules/state-context-interface.md

Each rule file contains:

Brief explanation of why it matters

Incorrect code example with explanation

Correct code example with explanation

Additional context and references

Full Compiled Document

For the complete guide with all rules expanded: AGENTS.md
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