# Create listErrors

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

> Lists the grouped exceptions in the query window — each an exception type with its message, count, service and first/last-seen — for the caller's org.

`POST /v1/o11y/listErrors`

> [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/listErrors` |
| **Method**    | `POST`                                    |
| **Operation** | `post_o11y_listerrors`                    |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`    |

Lists the grouped exceptions in the query window — each an
exception type with its message, count, service and first/last-seen — for the
caller's org.

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

## Request

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

| Field                 | In   | Type                 | Required | Description                                                            |
| --------------------- | ---- | -------------------- | -------- | ---------------------------------------------------------------------- |
| `end`                 | body | string               | —        | End is the window end, as a nanosecond epoch spelled as a string.      |
| `exceptionType`       | body | string               | —        | ExceptionType narrows to one exception type.                           |
| `limit`               | body | integer (int64)      | —        | Limit caps how many exception groups come back.                        |
| `offset`              | body | integer (int64)      | —        | Offset is how many groups to skip.                                     |
| `order`               | body | string               | —        | Order is the direction: ascending or descending.                       |
| `orderParam`          | body | string               | —        | OrderParam is the column to order by, e.g. exceptionCount, lastSeen.   |
| `serviceName`         | body | string               | —        | ServiceName narrows to one reporting service.                          |
| `start`               | body | string               | —        | Start is the window start, as a nanosecond epoch spelled as a string.  |
| `tags`                | body | o11y.O11yTagQuery\[] | —        | Tags narrow the scan to spans carrying the given tag values.           |
| `tags[].boolValues`   | body | boolean\[]           | —        | BoolValues are the boolean values to test against.                     |
| `tags[].key`          | body | string               | —        | Key is the tag to test.                                                |
| `tags[].numberValues` | body | number (double)\[]   | —        | NumberValues are the numeric values to test against.                   |
| `tags[].operator`     | body | string               | —        | Operator is the comparison, e.g. in, nin, contains, exists.            |
| `tags[].stringValues` | body | string\[]            | —        | StringValues are the string values to test against.                    |
| `tags[].tagType`      | body | string               | —        | TagType is where the tag lives, e.g. ResourceAttribute, SpanAttribute. |

## Response

| Status    | Body                  | Meaning           |
| --------- | --------------------- | ----------------- |
| `200`     | o11y.O11yListError\[] | ok                |
| `202`     | Approval              | held for approval |
| `default` | problem-details       | refused           |

`200` body — 7 fields.

| Field                 | In   | Type               | Always | Description                                                         |
| --------------------- | ---- | ------------------ | ------ | ------------------------------------------------------------------- |
| `[].exceptionCount`   | body | integer (uint64)   | —      | ExceptionCount is how many instances the group holds in the window. |
| `[].exceptionMessage` | body | string             | —      | ExceptionMsg is its message.                                        |
| `[].exceptionType`    | body | string             | —      | ExceptionType is the exception's type.                              |
| `[].firstSeen`        | body | string (date-time) | —      | FirstSeen is when the earliest was.                                 |
| `[].groupID`          | body | string             | —      | GroupID is the group's id.                                          |
| `[].lastSeen`         | body | string (date-time) | —      | LastSeen is when the latest instance was recorded.                  |
| `[].serviceName`      | body | string             | —      | ServiceName is the service that reported them.                      |

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

## Examples

**CLI**

```bash
hanzo o11y listErrors
```

**SDK**

**.ts**

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

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postO11yListerrors({ end: "<end>", exceptionType: "<exceptionType>" });
```

**.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_listerrors(end="<end>", exception_type="<exceptionType>")
```

**.go**

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

resp, _, err := client.O11yAPI.PostO11yListerrors(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_listerrors(&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).postO11yListerrors();
```

**HTTP**

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

**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)