Support confidential OAuth clients on the Preset MCP server

What is the problem or goal you're trying to solve or accomplish?

The Preset MCP server currently only supports PKCE public clients, which means integrations that require a confidential OAuth client (Client ID + Secret) and a fixed redirect URI are not supported out of the box.

How are you solving it currently?

Building custom agents as a workaround.

What is your recommended solution?

Support confidential OAuth clients and allow allowlisting of redirect URIs on the Preset MCP server. An example of an integration that requires this is Google Gemini Enterprise.