# Install the "React 19 Core Patterns" skill

You are installing an AgenticMarket skill into this workspace. Follow these steps exactly.

## 1. Detect your environment and choose the destination file
- Andromity: `.andromity/skills/react-19-mastery/SKILL.md` (or user scope `~/.andromity/skills/react-19-mastery/SKILL.md`)
- Antigravity / Gemini CLI: `.agent/skills/react-19-mastery/SKILL.md`
- Cursor: `.cursor/rules/react-19-mastery.mdc`
- Claude Code: append to `CLAUDE.md` (or `.claude/skills/react-19-mastery.md`)
- Windsurf: append to `.windsurfrules`
- Cline / Roo Code: `.clinerules/react-19-mastery.md`
- GitHub Copilot: append to `.github/copilot-instructions.md`
- ChatGPT / web only: paste the content into Custom Instructions
- Any other agent: save to `.agent/skills/react-19-mastery/SKILL.md`

## 2. Create the destination file
- Preserve every existing file and configuration entry.
- Create parent folders as needed.
- Never overwrite unrelated content.

## 3. Write exactly this content

```markdown
---
name: react-19-mastery
description: "Write idiomatic React 19 using useActionState, useOptimistic, Actions, ref-as-prop, and React Compiler idioms."
author: community
license: mit
version: 1.0.0
---
# React 19 Core Patterns

Leverage modern React 19 primitives:
- `useActionState` for managing form actions and server pending states.
- `useOptimistic` for instant UI feedback before server responses settle.
- Ref passed directly as a prop (no forwardRef boilerplate required).
- Native Document Metadata (`<title>`, `<meta>`) rendered directly in component trees.
```

## 4. Verify
- Confirm the file exists and is readable.
- Report the destination path and confirm the "React 19 Core Patterns" skill is installed and active.

Skill metadata:
- Slug: react-19-mastery
- Category: development
- License: mit
- Source: AgenticMarket