What specifically does this skill validate in my project?

It performs a 10-point check including file existence, server implementation patterns, widget configurations, tool response formats, resource handlers, and HTML structure compliance.

Why does it check for the text/html+skybridge MIME type?

This specific MIME type is required by the ChatGPT interface to correctly render interactive widgets via the Skybridge protocol.

What happens if a critical error is found?

The skill provides a detailed error report with specific fixes, such as changing import statements or adding missing session management maps.

Does it support the standard McpServer class?

No, this validator specifically enforces the use of the Server class from the MCP SDK to ensure compatibility with session-based streamable HTTP transports.

Can this skill help if my widgets aren't showing data?

Yes, it validates that your tool responses include both 'content' and 'structuredContent' fields, which are critical for passing data to the frontend widgets.

ChatGPT App Validator

Name: ChatGPT App Validator
Author: hollaugo

byhollaugo

•

Security & Testing

Validates ChatGPT Apps and MCP servers for schema compliance, widget configuration, and deployment readiness.

The ChatGPT App Validator is a specialized diagnostic skill designed for developers building within the ChatGPT App ecosystem. It performs a comprehensive audit of your codebase, verifying essential file structures, Model Context Protocol (MCP) implementation patterns, and widget configurations. By checking for critical requirements like streamable HTTP transports, specific MIME types, and structured tool responses, this skill ensures your application meets the necessary technical standards for a seamless user experience and successful deployment.

Key Features

01Structured content and tool response integrity checks

02Comprehensive file structure and mandatory dependency auditing

03MCP SDK pattern verification for session-based server implementations

04Endpoint verification for health checks, previews, and MCP handlers

0520 GitHub stars

06Widget configuration and URI schema validation (ui:// format)

Use Cases

01Debugging widget rendering and data flow issues in the ChatGPT interface

02Ensuring MCP servers adhere to required security and transport protocols

03Pre-deployment auditing for custom ChatGPT App integrations

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add hollaugo/tutorials validate

For use in Claude.ai and ChatGPT

Download Skill