What does this MCP validate?

It validates that React 19 useActionState hook implementations in JSX follow the required signature, specifically checking for the function reference and initial state.

Can I use this with Cursor or Claude?

Yes, you can connect this MCP to any MCP-compatible client including Claude, Cursor, and Windsurf.

Why would useActionState be invalid?

Common reasons include missing the second argument (initial state) or using an inline arrow function instead of a named function reference.

Do I need to host this myself?

No, Vinkius hosts and manages the MCP for you, so it is ready to use as soon as you connect your client.

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.

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Connect React 19 Useactionstate Validator to your AI

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Catch hook signature errors before you hit runtime.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 1 capability

We ship only the actions that matter.

Capability set01 / 01

01

1 capability in this set.

Part of 1 available through React 19 Validator.

01
Validate use action state
This capability checks React 19 useActionState hook usage within your provided JSX code. It confirms the presence and type of required arguments like the action identifier and initial state.

Real work

What teams actually run

Code Review

You can give your agent a block of code to verify if the useActionState implementation is correct before committing.

Rapid Prototyping

Quickly check if your new Server Action logic follows the required React 19 structure.

Debugging

Use the capability to find out why a hook is failing when the arguments don't match the expected signature.

One connector, every AI

React 19 Validator works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

Building your own app? The connector is yours to use.

You don't need a client to put React 19 Validator to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

695ms average. Fast in production.

React 19 Validator is checked daily against the live service.

Daily averagePeak 842ms

Oct 3Today

Fastest day: 556ms
Slowest day: 842ms
14-day trend: Improving-7%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 1 capability arrives ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of React 19 Validator, so you can see the experience inside your AI.

It does not authenticate your account with React 19 Validator. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

React 19 Validator Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp

Claude Desktop

Follow the steps below to connect in seconds.

1In Claude Desktop, open Settings → Connectors.
2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
3Click Add and start a new chat — React 19 Validator capabilities are ready to use.

Configuration · claude_desktop_config.jsonCopy

{
  "mcpServers": {
    "react-19-useactionstate-validator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_RgauFaFAEXI23Uf17fbKMXgg7ocgygpiBgv8DqCT/mcp"
    }
  }
}

Claude
ChatGPT
Cursor
VS Code
Windsurf
Claude Code
JetBrains
Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up React 19 Validator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work React 19 Validator owners hand off.

Frontend engineers working with React 19 and Server Actions.

01
Frontend Developer
Hands off JSX snippets to the agent to verify hook compliance.
02
React Engineer
Uses the MCP to ensure new Server Action implementations follow strict signature rules.

FAQ

Questions React 19 Validator owners ask.

01
What does this MCP validate?
It validates that React 19 useActionState hook implementations in JSX follow the required signature, specifically checking for the function reference and initial state.
02
Can I use this with Cursor or Claude?
Yes, you can connect this MCP to any MCP-compatible client including Claude, Cursor, and Windsurf.
03
Why would useActionState be invalid?
Common reasons include missing the second argument (initial state) or using an inline arrow function instead of a named function reference.
04
Do I need to host this myself?
No, Vinkius hosts and manages the MCP for you, so it is ready to use as soon as you connect your client.
05
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.
06
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.
07
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.

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More in Development

Connect React 19 Validator to Claude, Cursor, ChatGPT & more

Connect React 19 Useactionstate Validator to your AI

Your AI does the work. We keep it safe and sound.