# Create event

URL: https://docs.hanzo.ai/docs/openapi/o11y/post-o11y-event

> Records one product-analytics event for the signed-in user — a track event with a name and free-form attributes.

`POST /v1/o11y/event`

> [O11y →](https://docs.hanzo.ai/docs/openapi/o11y) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides)

|               |                                        |
| ------------- | -------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/o11y/event`   |
| **Method**    | `POST`                                 |
| **Operation** | `post_o11y_event`                      |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY` |

Records one product-analytics event for the signed-in user — a track
event with a name and free-form attributes.

Callers need the viewer role; the runtime's own gate enforces it.

## Request

5 fields, body `application/json` (required).

| Field          | In   | Type    | Required | Description                                                   |
| -------------- | ---- | ------- | -------- | ------------------------------------------------------------- |
| `attributes`   | body | object  | —        | Attributes are free-form event properties.                    |
| `attributes.*` | body | any     | —        |                                                               |
| `eventName`    | body | string  | —        | EventName names the event; required for track events.         |
| `eventType`    | body | string  | yes      | EventType is the kind of event — track, identify or group.    |
| `rateLimited`  | body | boolean | —        | RateLimited marks an event the reporting client rate-limited. |

## Response

| Status    | Body             | Meaning           |
| --------- | ---------------- | ----------------- |
| `200`     | o11y.O11yMessage | ok                |
| `202`     | Approval         | held for approval |
| `default` | problem-details  | refused           |

`200` body — 1 field.

| Field  | In   | Type   | Always | Description                         |
| ------ | ---- | ------ | ------ | ----------------------------------- |
| `data` | body | string | —      | Data is the acknowledgment message. |

Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors).

## Examples

**CLI**

```bash
hanzo o11y event --event-type <eventType>
```

**SDK**

**.ts**

```ts
import { Configuration, O11yApi } from 'hanzoai';

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postO11yEvent({ eventType: "<eventType>" });
```

**.py**

```python
from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import O11yApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = O11yApi(client).post_o11y_event(event_type="<eventType>")
```

**.go**

```go
cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.O11yAPI.PostO11yEvent(context.Background()).Execute()
if err != nil {
	return err
}
```

**.rs**

```rust
use hanzo_client::apis::{configuration::Configuration, o11y_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = o11y_api::post_o11y_event(&cfg, Default::default()).await?;
```

**.java**

```java
import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.O11yApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new O11yApi(client).postO11yEvent();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/o11y/event \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "eventType": "<eventType>"
     }'
```

**MCP**

MCP reaches **o11y** through the `o11y` tool, which names its 307 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them:

```bash
curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "describe",
         "arguments": {
           "op": "list_o11y_autocomplete_aggregate_attributes"
         }
       }
     }'
```

---

[O11y API](https://docs.hanzo.ai/docs/openapi/o11y) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)