# Create annotation

URL: https://docs.hanzo.ai/docs/openapi/o11y/createllmannotation

> Adds a human annotation to a trace or observation, optionally in a review queue.

`POST /v1/o11y/llm/annotation`

> [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/llm/annotation` |
| **Method**    | `POST`                                        |
| **Operation** | `CreateLLMAnnotation`                         |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`        |

Adds a human annotation to a trace or observation,
optionally in a review queue.

Callers need the editor role; the runtime's own gate enforces it, and it
validates the payload and stamps the annotation's author and org.

## Request

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

| Field           | In   | Type   | Required | Description                                                                               |
| --------------- | ---- | ------ | -------- | ----------------------------------------------------------------------------------------- |
| `content`       | body | string | —        | Content is the note itself.                                                               |
| `observationId` | body | string | —        | ObservationID is the single observation the annotation attaches to, when narrowed to one. |
| `queue`         | body | string | —        | Queue is the review queue to file the annotation in.                                      |
| `status`        | body | string | —        | Status is the annotation's initial review status.                                         |
| `traceId`       | body | string | —        | TraceID is the trace the annotation attaches to.                                          |

## Response

| Status    | Body                      | Meaning           |
| --------- | ------------------------- | ----------------- |
| `201`     | o11y.O11yLLMAnnotationOut | created           |
| `202`     | Approval                  | held for approval |
| `default` | problem-details           | refused           |

`201` body — 11 fields.

| Field                | In   | Type                   | Always | Description                                                                 |
| -------------------- | ---- | ---------------------- | ------ | --------------------------------------------------------------------------- |
| `data`               | body | o11y.O11yLLMAnnotation | —      |                                                                             |
| `data.author`        | body | string                 | —      | Author is who wrote it.                                                     |
| `data.content`       | body | string                 | —      | Content is the note itself.                                                 |
| `data.createdAt`     | body | string (date-time)     | —      | CreatedAt is when the annotation was stored.                                |
| `data.id`            | body | string                 | —      | ID is the annotation's id.                                                  |
| `data.observationId` | body | string                 | —      | ObservationID is the observation the annotation attaches to, when narrowed. |
| `data.queue`         | body | string                 | —      | Queue is the review queue the annotation sits in, when queued.              |
| `data.status`        | body | string                 | —      | Status is the annotation's review status, e.g. PENDING.                     |
| `data.traceId`       | body | string                 | —      | TraceID is the trace the annotation attaches to.                            |
| `data.updatedAt`     | body | string (date-time)     | —      | UpdatedAt is when the annotation last changed.                              |
| `status`             | body | string                 | —      | Status is "success".                                                        |

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

## Examples

**CLI**

```bash
hanzo o11y llm annotation create
```

**SDK**

**.ts**

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

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.createLLMAnnotation({ content: "<content>", observationId: "<observationId>" });
```

**.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).create_llm_annotation(content="<content>", observation_id="<observationId>")
```

**.go**

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

resp, _, err := client.O11yAPI.CreateLLMAnnotation(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::create_llm_annotation(&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).createLLMAnnotation();
```

**HTTP**

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

**MCP**

Tool `o11y`, op `CreateLLMAnnotation` — POST the JSON-RPC envelope to `https://api.hanzo.ai/v1/mcp`.

```bash
curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "o11y",
         "arguments": {
           "op": "CreateLLMAnnotation",
           "input": {
             "content": "<content>",
             "observationId": "<observationId>"
           }
         }
       }
     }'
```

---

[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)