Developer Mode setup
Enable Developer Mode, connect localhost tunnels, and verify app registration before debugging tools.
OAuth and remote MCP
Understand OAuth handoff, session IDs, callback URLs, scopes, and common token failures.
Widget and iframe debugging
Fix CSP, outputTemplate, widgetDomain, and window.openai bridge failures.
Tool result contracts
Validate structuredContent, content, _meta, and read-only/write action behavior.