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Client ID Metadata Documents are the registration mechanism the MCP 2026-07-28 spec recommends, and dynamic client registration the one it deprecates, but the `application_type` redirect URI constraint reached only the deprecated path: the field was dropped by the metadata document allowlist before validation ran. `type` and `application_type` both describe the client profile, so a registration sending both must keep them consistent. Cite RFC 8252 for the native redirect URI rule actually enforced; OIDC Registration predates claimed https links and does not permit them.