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React 19 useActionState Validator

React 19 useActionState Validator MCP Connector for Claude

A+

Validates React 19 `useActionState` hook implementations in JSX snippets.

1 tools Official Updated Oct 1, 2026 Official Vinkius Partner
More Details Connect to Claude

This MCP server provides a specialized validator for identifying correct React 19 useActionState hook implementations within JSX code snippets. It ensures that developers follow the strict signature requirements necessary for Server Actions, specifically checking that the first argument is a function reference and the second is an initial state. By using the validate_use_action_state tool, you can programmatically verify if your JSX snippet contains a correctly structured hook call, preventing runtime errors in React 19 applications.

react-19jsxserver-actionsvalidationfrontend

1 tools expose this connector's capabilities to your AI agent.

validate_use_action_state

Validates React 19 useActionState hook usage

See how to talk to your AI agent using React 19 useActionState Validator.

Is this JSX snippet valid: `const [state, action] = useActionState(handleSubmit, null);`?

Yes, the implementation is valid. The tool identified `handleSubmit` as the action identifier and `null` as the initial state.

Check this code: `useActionState(async (prev, fd) => { ... }, 0);`

The implementation is invalid because it uses an inline arrow function which prevents the extraction of a clear action identifier.

Validate `useActionState(myAction);`

The implementation is invalid because the second argument (initial state) is missing from the hook call.

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.

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