You do not have to understand every API field yourself. I download three Skills from the guide. Outloop Custom API Setup helps the agent prepare the integration. API Integration Development supports the technical research. Custom API Operations guides approved work after setup. Keep the complete ZIP packages for installation. These are the catalog versions tested in this recording; their candidate status still matters. I use Claude’s Skills upload route and select the complete ZIP. Keep the package zipped. I review Outloop Custom API Setup and save it. Claude checks the package before installation. This recording replaces an existing copy. I check the intended package, confirm replacement and verify it is enabled. I repeat the upload for API Integration Development and check its enabled state. The catalog package version is different from Claude’s revision number. Finally, I install Custom API Operations. With all three enabled, I start a fresh task in the connected folder to test actual activation and use.