Authorization server · Authorization
Issuer identifier in authorization responses
The authorization server returns the iss parameter on authorization responses (RFC 9207) and advertises authorization_response_iss_parameter_supported: true.
mcp.as.iss-param
In revision 2026-07-28
- Level
- SHOULD
- Defined in
- Authorization › Authorization Response ValidationMCP Authorization 2026-07-28
- Party
- Authorization server
- Observable
passiveObservable by reading published metadata, without any request to the server.
Level by revision
| Revision | Level | Section |
|---|---|---|
| 2026-07-28current | SHOULD | Authorization › Authorization Response Validation |
| 2025-11-25 | not defined |
Adoption across listed servers
- Supported0
- Partial0
- Unsupported0
- Unknown34
- Not applicable5