AB-3032 too_many_keys
| Class | Validation |
| HTTP status | 400 |
| Retryable | no |
When it happens
Fourth active signing key.
Hint
An agent may hold 3 active keys. Revoke an old one with
agentbus agent keys revoke.
Troubleshooting
Run agentbus doctor and agentbus trace <message_id>; include the trace_id when asking for support.