React 19 Validator Connector for AI agents.
1 live capability
Verify React 19 hook signatures in your JSX code.
Waiting for input…
Why people use React 19 Validator
Stop React 19 runtime errors with React 19 Validator
This MCP automates that check. Your agent scans your snippets and tells you exactly where the signature fails, so you can fix it before it ever reaches a browser.
What Vinkius changes
You stop shipping broken React 19 hooks.
Use it from Claude, ChatGPT, Cursor or another AI client you already have.
One account · 5,900+ Connectors
- Real-world use case 01
Broken Server Action implementation
A developer is migrating to React 19 and uses an agent to refactors code.
- Real-world use case 02
Validating React 19 hook signatures
You're refactoring a large component library to React 19 and want to ensure all useActionState calls are valid.
Complete set · 1capability
The complete React 19 Validator capability set.
These are the exact actions your AI can choose when you ask it to work with React 19 Validator.
01
1 capability in this set.
Part of 1 available through React 19 Validator.
- 01 Capability
Validate use action state
Checks if a JSX snippet uses the useActionState hook with the correct function and initial state arguments. It helps prevent broken Server Action implementations.
Set up in minutes
One URL. Then ask React 19 Validator to work.
Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use React 19 Validator from the conversation.
Choose your client
Live previewAdvanced clients IDE · CLI
Claude · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp - Step 01
Open Connectors
In Claude Web or Claude Desktop, open Settings and choose Connectors.
- Step 02
Add the URL
Choose Add custom connector, name it React 19 Validator, and paste the URL above.
- Step 03
Turn it on in chat
Select +, open Connectors, and enable React 19 Validator for the conversation.
ChatGPT · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp - Step 01
Open MCP settings
On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
- Step 02
Add the URL
Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the React 19 Validator URL.
- Step 03
Save and start
Save the connection and enable React 19 Validator in your conversation. Desktop may ask you to restart once.
Cursor · IDE configuration
Advanced setup
{
"mcpServers": {
"react-19-useactionstate-validator": {
"url": "https://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp"
}
}
}- Step 01
Open MCP Settings
Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
- Step 02
Add the server config
Paste the JSON configuration above into the mcp.json file that opens
- Step 03
Save the file
Cursor will automatically detect the new Connector
- Step 04
Start using React 19 Validator
Open Agent mode in chat and ask: "Using React 19 Validator, help me...". 1 tools available
VS Code Copilot · IDE configuration
Advanced setup
{
"mcpServers": {
"react-19-useactionstate-validator": {
"url": "https://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp"
}
}
}- Step 01
Create MCP config
Create a .vscode/mcp.json file in your project root
- Step 02
Add the server config
Paste the JSON configuration above
- Step 03
Enable Agent mode
Open GitHub Copilot Chat and switch to Agent mode using the dropdown
- Step 04
Start using React 19 Validator
Ask Copilot: "Using React 19 Validator, help me...". 1 tools available
Windsurf · IDE configuration
Advanced setup
{
"mcpServers": {
"react-19-useactionstate-validator": {
"url": "https://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp"
}
}
}- Step 01
Open MCP Settings
Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
- Step 02
Add the server
Paste the JSON configuration above into mcp_config.json
- Step 03
Save and reload
Windsurf will detect the new server automatically
- Step 04
Start using React 19 Validator
Open Cascade and ask: "Using React 19 Validator, help me...". 1 tools available
Cline · IDE configuration
Advanced setup
{
"mcpServers": {
"react-19-useactionstate-validator": {
"url": "https://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp"
}
}
}- Step 01
Open Cline MCP Settings
Click the Connectors icon in the Cline sidebar panel
- Step 02
Add remote server
Click "Add Connector" and paste the configuration above
- Step 03
Enable the server
Toggle the server switch to ON
- Step 04
Start using React 19 Validator
Ask Cline: "Using React 19 Validator, help me...". 1 tools available
Claude Code · Terminal command
Advanced setup
claude mcp add react-19-useactionstate-validator --transport http "https://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp"- Step 01
Install Claude Code
Run npm install -g @anthropic-ai/claude-code if not already installed
- Step 02
Add the Connector
Run the command above in your terminal
- Step 03
Verify the connection
Run claude mcp to list connected servers, or type /mcp inside a session
- Step 04
Start using React 19 Validator
Ask Claude: "Using React 19 Validator, show me...". 1 tools are ready
Where the request belongs
Work React 19 Validator can move forward.
Frontend engineers and React developers who are migrating to React 19 and need to ensure their Server Action implementations are syntactically correct.
React Developer
Checking new hook implementations for compliance with React 19 standards during refactors.
Full-stack Engineer
Ensuring that frontend JSX correctly wires up to backend Server Actions without runtime errors.
Build the capability set
Add more capabilities.
Each Connector adds new actions and data without changing how you work.
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JSON Schema Strict Validator
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Bring your own AI
Change the model, client or framework. Keep React 19 Validator connected.
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Claude -
ChatGPT -
Gemini -
Cursor -
VS Code -
Windsurf -
ZCode -
Cline -
Zed -
Continue -
Kiro -
Roo Code -
Zencoder -
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Void -
Augment Code -
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5ire -
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LangChain -
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CrewAI -
Vercel AI SDK
Before you connect
Questions about React 19 Validator.
The practical details behind the request, access and result.
How can I use React 19 Validator MCP to check my code?
You simply provide your JSX snippet to your AI client, and it uses the validator to check if your hook implementation follows the required signature.
Will React 19 Validator MCP catch errors in my Server Actions?
Yes, it specifically looks for the correct function reference and initial state arguments needed for Server Actions to work without runtime errors.
Can I use React 19 Validator MCP with Cursor or Claude?
Absolutely. Any MCP-compatible client like Cursor, Claude, or Windsurf can use this capability to inspect your React code snippets.
Does React 19 Validator MCP check for more than just useActionState?
This specific MCP is focused on validating the implementation of the useActionState hook within your JSX code.
Can this capability help me migrate to React 19?
It's a great companion for migrations, as it helps you quickly verify that your new hook usage adheres to the strict new API requirements.
What does this capability validate?
It validates that the useActionState hook in a JSX snippet follows the React 19 signature, ensuring the action handler is properly identified and an initial state is provided.
Can I use this for Server Actions?
Yes, it is specifically designed to ensure that the action handler pattern used in React 19 Server Actions is structurally sound.
What happens if the JSX snippet is invalid?
The validate_use_action_state capability will return isValid: false along with a list of specific validation errors detailing the structural failures.
One connection away
Give your agent a direct line to React 19 Validator.
Connect React 19 Validator once. Keep it beside 5,900+ managed Connectors when the next task needs more.
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