# Create messages

URL: https://docs.hanzo.ai/docs/openapi/provider/post-provider-slack-messages

> Posts as Hanzo to the caller's connected Slack workspace.

`POST /v1/provider/slack/messages`

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

|               |                                                   |
| ------------- | ------------------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/provider/slack/messages` |
| **Method**    | `POST`                                            |
| **Operation** | `post_provider_slack_messages`                    |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`            |

Posts as Hanzo to the caller's connected Slack workspace.
Use channel from a message read and thread\_ts to reply to a specific message.
Requires chat:write; this operation does not join channels automatically.

## Request

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

| Field       | In   | Type   | Required | Description                                                                 |
| ----------- | ---- | ------ | -------- | --------------------------------------------------------------------------- |
| `channel`   | body | string | —        | Channel is a Slack channel ID, name (#hanzo-gtm), or Slack channel mention. |
| `text`      | body | string | —        | Text is the message to post as Hanzo, up to 40000 characters.               |
| `thread_ts` | body | string | —        | ThreadTS optionally replies under this parent message's exact ts.           |

## Response

| Status    | Body                         | Meaning |
| --------- | ---------------------------- | ------- |
| `200`     | provider.slackSendMessageOut | ok      |
| `default` | problem-details              | refused |

`200` body — 2 fields.

| Field     | In   | Type   | Always | Description                                                      |
| --------- | ---- | ------ | ------ | ---------------------------------------------------------------- |
| `channel` | body | string | —      | Channel is the resolved channel ID where the message was posted. |
| `ts`      | body | string | —      | TS is the posted message's exact Slack timestamp.                |

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

## Examples

**CLI**

```bash
hanzo provider slack messages create
```

**SDK**

**.ts**

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

const api = new ProviderApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postProviderSlackMessages({ channel: "<channel>", text: "<text>" });
```

**.py**

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

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = ProviderApi(client).post_provider_slack_messages(channel="<channel>", text="<text>")
```

**.go**

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

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

**.rs**

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

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

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

**.java**

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

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

var result = new ProviderApi(client).postProviderSlackMessages();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/provider/slack/messages \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "channel": "<channel>",
       "text": "<text>"
     }'
```

**MCP**

MCP reaches **provider** through the `provider` 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_connections"
         }
       }
     }'
```

---

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