# List sessions — GET /v1/o11y/llm/sessions

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

> Lists conversations — gen_ai spans grouped by session.id, with their trace and observation counts, tokens and cost.

`GET /v1/o11y/llm/sessions`

> [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/sessions` |
| **Method**    | `GET`                                       |
| **Operation** | `ListLLMSessions`                           |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`      |

Lists conversations — gen\_ai spans grouped by session.id, with
their trace and observation counts, tokens and cost.

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

## Request

9 fields.

| Field       | In    | Type    | Required | Description                                                   |
| ----------- | ----- | ------- | -------- | ------------------------------------------------------------- |
| `start`     | query | integer | —        | Start is the start of the window as a unix-millisecond epoch. |
| `end`       | query | integer | —        | End is the end of the window as a unix-millisecond epoch.     |
| `traceId`   | query | string  | —        | TraceID narrows the view to one trace.                        |
| `sessionId` | query | string  | —        | SessionID narrows the view to one conversation.               |
| `userId`    | query | string  | —        | UserID narrows the view to one end user.                      |
| `name`      | query | string  | —        | Name narrows the view to observations of one name.            |
| `model`     | query | string  | —        | Model narrows the view to one model.                          |
| `offset`    | query | integer | —        | Offset is how many rows to skip, for paging.                  |
| `limit`     | query | integer | —        | Limit caps how many rows come back.                           |

## Response

| Status    | Body                    | Meaning           |
| --------- | ----------------------- | ----------------- |
| `200`     | o11y.O11yLLMSessionsOut | ok                |
| `202`     | Approval                | held for approval |
| `default` | problem-details         | refused           |

`200` body — 13 fields.

| Field                           | In   | Type                     | Always | Description                                                   |
| ------------------------------- | ---- | ------------------------ | ------ | ------------------------------------------------------------- |
| `data`                          | body | o11y.O11yLLMSessionsPage | —      |                                                               |
| `data.items`                    | body | o11y.O11yLLMSession\[]   | —      | Items are the conversations, newest first.                    |
| `data.items[].completionTokens` | body | integer (int64)          | —      | CompletionTokens is the conversation's total output tokens.   |
| `data.items[].id`               | body | string                   | —      | ID is the session id.                                         |
| `data.items[].observations`     | body | integer (int64)          | —      | Observations is how many observations the conversation holds. |
| `data.items[].promptTokens`     | body | integer (int64)          | —      | PromptTokens is the conversation's total input tokens.        |
| `data.items[].totalCost`        | body | number (double)          | —      | TotalCost is the conversation's total cost.                   |
| `data.items[].totalTokens`      | body | integer (int64)          | —      | TotalTokens is the conversation's total tokens.               |
| `data.items[].traces`           | body | integer (int64)          | —      | Traces is how many traces the conversation holds.             |
| `data.items[].userId`           | body | string                   | —      | UserID is the end user the conversation is attributed to.     |
| `data.limit`                    | body | integer (int64)          | —      | Limit is the page cap the read ran with.                      |
| `data.offset`                   | body | integer (int64)          | —      | Offset is the row offset this page started at.                |
| `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 sessions
```

**SDK**

**.ts**

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

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.listLLMSessions();
```

**.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).list_llm_sessions()
```

**.go**

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

resp, _, err := client.O11yAPI.ListLLMSessions(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::list_llm_sessions(&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).listLLMSessions();
```

**HTTP**

```bash
curl https://api.hanzo.ai/v1/o11y/llm/sessions \
  -H "Authorization: Bearer $HANZO_API_KEY"
```

**MCP**

Tool `o11y`, op `ListLLMSessions` — 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": "ListLLMSessions",
           "input": {}
         }
       }
     }'
```

---

[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)