# Create declare

URL: https://docs.hanzo.ai/docs/openapi/git/post-runner-declare

> Republishes what a registered runner can do, and answers with what this side understands, so the two learn about each other from one exchange.

`POST /v1/runner/declare`

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

|               |                                          |
| ------------- | ---------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/runner/declare` |
| **Method**    | `POST`                                   |
| **Operation** | `post_runner_declare`                    |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`   |

Republishes what a registered runner can do, and answers with what
this side understands, so the two learn about each other from one exchange.

## Request

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

| Field            | In     | Type      | Required | Description                                                                                                   |
| ---------------- | ------ | --------- | -------- | ------------------------------------------------------------------------------------------------------------- |
| `x-runner-uuid`  | header | string    | —        |                                                                                                               |
| `x-runner-token` | header | string    | —        |                                                                                                               |
| `capabilities`   | body   | string\[] | —        | Capabilities are the optional protocol behaviours this runner understands, e.g. "cancelling".                 |
| `labels`         | body   | string\[] | —        | Labels replace what the forge holds, so a relabelled runner follows its configuration without re-registering. |
| `version`        | body   | string    | —        | Version is the runner build now running.                                                                      |

## Response

| Status    | Body              | Meaning |
| --------- | ----------------- | ------- |
| `200`     | runner.DeclareOut | ok      |
| `default` | problem-details   | refused |

`200` body — 9 fields.

| Field              | In   | Type            | Always | Description                                                                                                                                  |
| ------------------ | ---- | --------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------------- |
| `capabilities`     | body | string\[]       | —      | Capabilities are what THIS FORGE understands, so a runner learns what the other side supports from the reply body rather than from a header. |
| `runner`           | body | runner.Identity | —      |                                                                                                                                              |
| `runner.ephemeral` | body | boolean         | —      | Ephemeral means the runner takes ONE job and exits, so the forge must not expect it back.                                                    |
| `runner.id`        | body | integer (int64) | —      | ID is the forge's own row id for this runner.                                                                                                |
| `runner.labels`    | body | string\[]       | —      | Labels are what a workflow's `runs-on:` selects this runner by.                                                                              |
| `runner.name`      | body | string          | —      | Name is what a person calls this runner in the forge's UI.                                                                                   |
| `runner.token`     | body | string          | —      | Token is the secret that authenticates that handle.                                                                                          |
| `runner.uuid`      | body | string          | —      | UUID is the handle the runner presents on every later op.                                                                                    |
| `runner.version`   | body | string          | —      | Version is the runner build the forge last heard from.                                                                                       |

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

## Examples

**CLI**

```bash
hanzo runner declare
```

**SDK**

**.ts**

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

const api = new GitApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postRunnerDeclare({ capabilities: ["<capabilities>"], labels: ["<labels>"] });
```

**.py**

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

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = GitApi(client).post_runner_declare(capabilities=["<capabilities>"], labels=["<labels>"])
```

**.go**

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

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

**.rs**

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

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

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

**.java**

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

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

var result = new GitApi(client).postRunnerDeclare();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/runner/declare \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "capabilities": [
         "<capabilities>"
       ],
       "labels": [
         "<labels>"
       ]
     }'
```

**MCP**

MCP reaches **git** through the `git` tool, which names its 38 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_git_keys"
         }
       }
     }'
```

---

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