sunpeak Blog

Insights, tutorials, and updates about MCP Apps and ChatGPT Apps.

Live Testing for Claude Connectors and ChatGPT Apps: Test Against Real Hosts with Playwright (June 2026)

Abe Wheeler June 7, 2026

Run automated Playwright tests against real ChatGPT and Claude sessions to validate your Claude Connector or MCP App end-to-end. Learn what live tests catch, when to run them, how to keep them stable, and how sunpeak handles auth, host refresh, and iframe access.

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Debugging Claude Connectors: Fix Common Errors in Development and Production (May 2026)

Abe Wheeler May 24, 2026

Your Claude Connector is not working. Here is how to diagnose and fix connection failures, OAuth discovery errors, tools not being called, MCP App UI rendering bugs, output limits, and timeouts.

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Claude Connector Authentication: How OAuth Works and When You Need It (May 2026)

Abe Wheeler May 12, 2026

A developer guide to OAuth authentication for Claude Connectors. Learn when auth is required, how the OAuth 2.1 flow works with Claude, how to configure callback URLs and discovery documents, and what the Connectors Directory submission requires.

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What Are Claude Connectors? Data Access, Auth, Custom Setup, and Troubleshooting (May 2026)

Abe Wheeler May 11, 2026

Claude Connectors give Claude access to external data through MCP. Learn what data Claude can access through 375+ connectors, how authentication works, how to add custom connectors, and how to troubleshoot common issues.

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The Fastest Way to Prototype ChatGPT & MCP Apps

Hanh Nguyen May 7, 2026

A guest post by our friends at Fractal on how to validate ChatGPT App ideas with users before committing engineering time, and how to keep testing the app as it grows.

ChatGPT Apps MCP Apps Prototyping Guest Post

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Claude Connectors Tutorial: Build and Deploy a Connector to Claude (May 2026)

Abe Wheeler May 5, 2026

Build an interactive Claude Connector from scratch. Learn the architecture, create tools and UI resources, test locally with the multi-host inspector, connect to a real Claude session with ngrok, and submit to the Connectors Directory.

Claude Connectors Claude Apps MCP Apps MCP App Framework ChatGPT Apps ChatGPT App Framework Claude Connector Framework Claude Connector Testing

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Claude Inspector for MCP Apps: Test Claude Connectors Locally with sunpeak (April 2026)

Abe Wheeler April 30, 2026

Test Claude Connectors and MCP Apps locally with the sunpeak Inspector. Switch between Claude, ChatGPT, and other host runtimes from a single dev server, run automated tests across hosts, and ship cross-platform apps from one codebase.

Claude Apps Claude Connectors Claude Connector Testing Claude Connector Framework MCP Apps MCP App Framework MCP App Testing ChatGPT Apps ChatGPT App Framework ChatGPT App Testing