# Schema changes

Detect, refresh, and configure propagation of schema changes for a connection.

## Get schema changes

List detected schema changes for a connection.

#### Path Parameters

**`connection_id`** string required

The connection ID.

## Refresh schema

Trigger schema discovery to detect new or changed fields and streams.

## Update schema propagation

Set how schema changes are handled automatically.

#### Request Body

**`propagation_strategy`** string required

One of: `propagate_fully`, `propagate_columns`, `ignore`, `disable_connection`.

## Returns

A schema changes object containing a `changes` array and optional `catalog_diff`.

Request

```bash cURL
curl "https://api.aitronos.com/v1/organizations/org_xyz789/knowledge/connectors/connections/conn_abc123/schema-changes" \
  -H "Authorization: Bearer $ACCESS_TOKEN"
```


```python Python SDK
from aitronos import Aitronos

client = Aitronos(api_key="your-api-key")

changes = client.knowledge_connectors.get_schema_changes(
    organization_id="org_xyz789",
    connection_id="conn_abc123",
)
print(changes)
```


```python Python
import requests

org_id = "org_xyz789"
conn_id = "conn_abc123"
url = f"https://api.aitronos.com/v1/organizations/{org_id}/knowledge/connectors/connections/{conn_id}/schema-changes"
headers = {"Authorization": "Bearer YOUR_ACCESS_TOKEN"}

response = requests.get(url, headers=headers)
print(response.json())
```


```javascript JavaScript
const response = await fetch(
  "https://api.aitronos.com/v1/organizations/org_xyz789/knowledge/connectors/connections/conn_abc123/schema-changes",
  {
    headers: { Authorization: "Bearer YOUR_ACCESS_TOKEN" },
  }
);
const data = await response.json();
console.log(data);
```

Response

```json 200 OK
{
  "changes": [
    {
      "stream_name": "users",
      "change_type": "field_added",
      "field": "phone_number",
      "field_type": "string"
    }
  ],
  "catalog_diff": {}
}
```


```json 4xx Error
{
  "success": false,
  "error": {
    "code": "CONNECTOR_SCHEMA_CHANGE_ERROR",
    "message": "An error occurred while processing schema changes.",
    "type": "client_error",
    "status": 400,
    "details": {},
    "trace_id": "abc-123-def",
    "timestamp": "2025-12-22T15:30:00Z"
  }
}
```

## Related Resources

- [Manage Connections](/docs/api-reference/knowledge-connectors/connections)
- [Stream Configuration](/docs/api-reference/knowledge-connectors/stream-config)