Insights, tutorials, and updates about MCP Apps and ChatGPT Apps.
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.
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.
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.
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.
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.
Run automated Playwright tests against real ChatGPT sessions to validate your Claude Connector or MCP App end-to-end. sunpeak handles auth, MCP server refresh, and iframe access so you only write assertions.
Your Claude Connector is not working. Here is how to diagnose and fix the most common issues: connection failures, tools not called, UI not rendering, OAuth errors, token limits, and timeouts.
