# WebSocket Event Schema Validator MCP for AI Agents MCP

> WebSocket Event Schema Validator ensures your real-time socket messages follow the rules. It catches broken payloads and missing event definitions before they crash your client-side logic or backend services. Perfect for anyone managing complex Socket.io or WebSocket streams where structural consistency is non-negotiable.

## Overview
- **Category:** validation
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/undefined/mcp
- **Tags:** websocket, schema, payload, socketio, validation

## Description

Managing real-time data streams is a nightmare when a single malformed message breaks your entire frontend. You spend hours debugging why a specific event didn't trigger or why the UI just stopped updating. This MCP acts as a gatekeeper for your socket communications. It checks every incoming payload against a registry you define, making sure no missing fields or wrong data types slip through. Instead of manually inspecting network tabs, you can let your agent handle the heavy lifting. You can even scan your entire registry to find incomplete definitions that might cause future issues. By connecting this to your workflow via Vinkius, you get a centralized way to maintain structural integrity across all your socket-based services without constantly manual testing every single event type.

## Tools

### audit_schema_registry
Scans your entire registry to find incomplete or broken definitions. It helps you clean up your schema management.

### validate_event_payload
Checks a specific WebSocket message against your registered rules. Use this to catch malformed data immediately.

### verify_event_registration
Confirms whether an event name exists in your registry. This prevents sending unregistered or unknown event types.

## Prompt Examples

**Prompt:** 
```
Is this payload valid for the user_login event? {"event_type": "user_login", "user_id": 123}
```

**Response:** 
```
The payload is invalid because the `user_login` event requires a `timestamp` field in the registry.
```

**Prompt:** 
```
Check if 'chat_message' is actually registered in my schema.
```

**Response:** 
```
Yes, the `chat_message` event is officially registered and ready to use.
```

**Prompt:** 
```
Are there any errors in my current schema registry?
```

**Response:** 
```
I found one issue: the `system_alert` event has an incomplete definition with no structural rules.
```

## Capabilities

### Catch broken payloads
Instantly identify missing fields or incorrect data types in incoming messages.

### Verify event existence
Confirm if a specific event name is officially part of your registry.

### Audit registry integrity
Scan your entire schema list to find empty or incomplete definitions.

### Maintain structural consistency
Ensure every message sent over your connection follows the same rules.

## Use Cases

### Broken UI components
A developer notices the chat window stops updating; they ask their agent to check if the incoming chat_message payload matches the schema.

### Deployment anxiety
Before pushing a new backend version, an engineer uses the MCP to audit the entire registry for any accidental deletions or changes.

### Integration testing
A QA tester provides a raw WebSocket frame and asks the agent to verify if it adheres to the existing event rules.

### New feature development
An engineer creates a new event type and immediately verifies its registration status to ensure the client can recognize it.

## Benefits

- Stop runtime crashes by using validate_event_payload to catch bad data before it hits your application logic.
- Clean up messy registries by running audit_schema_registry to find empty or incomplete event definitions.
- Prevent ghost events by using verify_event_registration to ensure every name is officially recognized.
- Reduce debugging time spent digging through browser network tabs for malformed WebSocket frames.
- Maintain a single source of truth for all your socket-based event structures and data types.

## How It Works

The bottom line is you stop guessing if your socket messages are valid and start knowing.

1. Connect your preferred AI client to the MCP via Vinkius.
2. Point your agent toward your WebSocket schema registry or payload samples.
3. Ask your agent to validate specific payloads or audit your current event definitions.

## Frequently Asked Questions

**How can WebSocket Event Schema Validator prevent app crashes?**
It catches malformed payloads and incorrect data types before they reach your application logic, preventing runtime errors.

**Can I use WebSocket Event Schema Validator for Socket.io?**
Yes, any socket-based communication that uses a schema registry can be validated using this MCP.

**Does WebSocket Event Schema Validator check my entire event list?**
You can use the audit feature to scan your whole registry for incomplete or empty definitions.

**How do I know if an event name is correct with WebSocket Event Schema Validator?**
You can ask your agent to verify if a specific name is officially registered in your schema.

**What happens if my payload has the right fields but wrong types?**
The MCP will flag it as invalid, specifically noting that the data type does not match the registry.

**How does the validator identify which schema to use?**
The `validate_event_payload` tool extracts the event type directly from the provided payload and then performs a lookup in your provided `schemaRegistry` to find the matching rules.

**Can I use this for Socket.io or native WebSockets?**
Yes, it works with any WebSocket-based communication, including Socket.io and native WebSockets, as long as you provide the payload and the corresponding registry.

**What happens if an event is not in my registry?**
If the event type found in the payload does not exist in your `schemaRegistry`, the validator will return `unregisteredEvent: true` and mark the payload as invalid.