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IFWhen a client performs OAuth authorization with an MCP server that requires a default scope, omitting the scope parameter leads to an invalid_scope error, and the client has no way to know which minimal scope to request.

THENImplement a fallback strategy: first extract scope from any WWW-Authenticate header in the 401 response. If none, omit the scope parameter to let the server apply its default. If the server then returns 'invalid_scope', fall back to requesting all scopes from the server's supported_scopes metadata. This ensures the client can authenticate without over-privileging.

IFWhen an MCP client performs OAuth authorization without knowing the server's required default scope, it may omit the scope parameter (causing invalid_scope error) or request all supported scopes (excessive privilege grant).

THENImplement a three-step scope selection strategy: first use any scope provided in a 401 WWW-Authenticate challenge header; if none, omit the scope parameter so the server uses its defaults; if the server returns an invalid_scope error, fall back to requesting all supported_scopes. Also update the server to provide default scopes when scope is omitted for better interop.

IFMCP client attempts authorization but server requires a default scope unknown to the client, resulting in invalid_scope error or over-privileged scope request.

THENImplement a prioritized scope selection strategy: first, extract scope from the WWW-Authenticate header challenge; if not present, omit scope parameter to let server use defaults; if invalid_scope error occurs, fall back to all supported_scopes. This prevents over-scoping while handling servers with required defaults.