support for 2025-06-08 auth spec

[mellery451]

I'm using a server built specifically with latest spec support for auth - and I'm getting internal server error when trying to complete authorization with the generated URL. https://modelcontextprotocol.io/specification/2025-06-18/basic/authorization . Is there any plan to support the 06-08 spec (if it's meaningfully different from the prior one) ? thanks.

[ravitemer]

@mellery451 would you mind sharing the MCP server that you are using?

[mellery451]

I would love to, but it's internal/private. I will see if I can find any information about the server that might be helpful

[mellery451]

all I could find as far as requirement are these:

MCP client implements OAuth 2.1 authorization as defined in the MCP specification
Support for Dynamic Client Registration (RFC7591)
Support for Resource Indicators (RFC8707)
HTTP-based transport with proper authorization headers

not sure if that helps or not.

[mellery451]

I think the service was mainly designed/tested with Cursor one-click MCP install in mind, FWIW

[ravitemer]

Thanks! Oauth with dynamic client registration used to work fine last time I tested it with some server.

I'll debug it tomorrow and see if it's a protocol issue or something.

Just to be sure, I'm hoping the server works fine with other MCP clients like vscode or claude?