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skills/reviewing-state-management/SKILL.md

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+---
+name: reviewing-state-management
+description: Review state management patterns for React 19 best practices. Use when reviewing component state, Context usage, or state architecture.
+review: true
+allowed-tools: Read, Grep
+version: 1.0.0
+---
+
+# Review: State Management
+
+## Checklist
+
+### State Immutability
+- [ ] No direct state mutation
+- [ ] Using spread operators or immutable update patterns
+- [ ] Arrays updated with map/filter/concat (not push/splice)
+- [ ] Objects updated with spread or Object.assign
+
+### State Location
+- [ ] Local state used when appropriate
+- [ ] Context only for cross-cutting concerns
+- [ ] No prop drilling through 3+ levels
+- [ ] Frequently changing state not in Context
+
+### useReducer Usage
+- [ ] Used for complex state logic
+- [ ] Reducer functions are pure
+- [ ] Action types are consistent
+- [ ] State updates follow patterns
+
+### Context Patterns
+- [ ] Split contexts for different concerns
+- [ ] Using `use()` API in React 19 (not `useContext`)
+- [ ] Context providers at appropriate level
+- [ ] No unnecessary re-renders
+
+### Anti-Patterns
+- [ ] ❌ Direct state mutation (`state.push()`, `state.x = y`)
+- [ ] ❌ Context for frequently changing values
+- [ ] ❌ Excessive prop drilling
+- [ ] ❌ God components managing too much state
+
+For comprehensive state patterns, see: `research/react-19-comprehensive.md`.