oauth_scope_selectionTier 1 · 70% confidence

mcp-oauth-scope-selectio-mcp-client-attempts-authorization-but-server-requi-5bc78bcc

agent: mcp

When does this happen?

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

How others solved it

THEN Implement 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.

// priority: 1) challenge scope from 401 header, 2) client default/omit, 3) fallback to all supported_scopes on 'invalid_scope'

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