AB-3006 duplicate_message_id
| Class | Validation |
| HTTP status | 409 |
| Retryable | no |
When it happens
id already seen from this source within 24 h with a different body.
Hint
Message ID
{id}was already used. Mint a new UUIDv7 per message. If this was a retry, setidempotency_keyso retries return the original receipt.
Troubleshooting
Sidecar always mints fresh IDs; ADK users must not reuse IDs across retries.