Insights, tutorials, and updates about MCP Apps and ChatGPT Apps.
A current developer guide to authentication for Claude Connectors. Covers OAuth, CIMD, DCR, Anthropic-held credentials, static headers, Enterprise Managed Auth, callback URLs, protected resource metadata, token refresh, and local testing.
Claude Connectors are MCP-backed integrations that let Claude use external tools and data. Learn how web connectors, custom remote MCP connectors, desktop extensions, auth, permissions, interactive UI, and testing work in 2026.
A refreshed guest post by our friends at Fractal on how to prototype ChatGPT Apps and MCP Apps before a full engineering build, validate the trigger and UI with users, then use sunpeak to test the app as it grows.
Build an interactive Claude Connector from scratch. Learn the current remote MCP architecture, create tools and MCP App resources, test locally with the multi-host inspector, connect to a real Claude session, and prepare for Connectors Directory submission.
Test Claude Connectors and MCP Apps locally with the sunpeak Inspector. Learn what to verify in the Claude runtime, what to cover with automated tests, and what still needs a live host check before release.
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.
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.
