> ## Documentation Index
> Fetch the complete documentation index at: https://deepline.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Slack: Reply In Thread

> Reply to an existing Slack message thread in a channel or direct message. Includes SDK V2 examples, input constraints, response fields, and Deepline cost.

Reply to an existing Slack message thread in a channel or direct message.

> [!NOTE]
>
> Tool ID: `slack_reply_in_thread`

## Run this action

Use the TypeScript SDK for one call. Use `ctx.tools.execute(...)` inside a Play for durable calls, scheduled calls, or CSV processing.

```ts theme={"languages":{"custom":["/languages/deepline-prompt.json"]}}
import { Deepline } from 'deepline';

const deepline = await Deepline.connect();
const result = await deepline.tools.execute(
  'slack_reply_in_thread',
  {
    "channel": "example",
    "thread_ts": "example"
  },
);

console.log(result.toolResponse.raw);
```

### CLI

```bash theme={"languages":{"custom":["/languages/deepline-prompt.json"]}}
deepline tools execute slack_reply_in_thread --input '{
  "channel": "example",
  "thread_ts": "example"
}' --json
```

## Example response

The static output schema lacks the details for a reliable example. Use `deepline describe slack_reply_in_thread --json` for the complete live contract.

## Input reference

| Name | Type | Required | Default | Details |
| - | - | - | - | - |
| `payload.channel` | `string` | Yes | — | Slack channel ID. |
| `payload.text` | `string` | No | — | Slack message text. Recommended accessibility fallback when blocks or attachments are supplied. |
| `payload.attachments` | `array` | No | — | — |
| `payload.blocks` | `array` | No | — | Maximum items: 50. |
| `payload.as_user` | `boolean` | No | — | — |
| `payload.current_draft_last_updated_ts` | `string` | No | — | Minimum length: 1. |
| `payload.icon_emoji` | `string` | No | — | Minimum length: 1. |
| `payload.icon_url` | `string` | No | — | Format: `uri`. Minimum length: 1. |
| `payload.link_names` | `boolean` | No | — | — |
| `payload.markdown_text` | `string` | No | — | Maximum length: 12000. |
| `payload.metadata` | `record` | No | — | — |
| `payload.mrkdwn` | `boolean` | No | — | — |
| `payload.parse` | `"none" \| "full"` | No | — | Allowed: `none`, `full`. |
| `payload.reply_broadcast` | `boolean` | No | — | — |
| `payload.thread_ts` | `string` | Yes | — | Timestamp of the parent message to reply to. |
| `payload.unfurl_app_links` | `boolean` | No | — | — |
| `payload.unfurl_links` | `boolean` | No | — | — |
| `payload.unfurl_media` | `boolean` | No | — | — |
| `payload.username` | `string` | No | — | Minimum length: 1. |

> [!NOTE]
>
> This input schema is too large for an inline display. Read the complete live contract with `deepline describe slack_reply_in_thread --json`.

## Output reference

Standard tool result payload.

| Name | Type | Required | Default | Details |
| - | - | - | - | - |
| `result.data` | `record` | Yes | — | Provider response payload. |
| `result.meta` | `record` | No | — | Additional response metadata. |

<details>
  <summary>Show raw output schema</summary>

  ### Output JSON Schema

  ```json theme={"languages":{"custom":["/languages/deepline-prompt.json"]}}
  {
    "type": "object",
    "description": "Standard tool result payload.",
    "properties": {
      "data": {
        "type": "object",
        "description": "Provider response payload.",
        "additionalProperties": {}
      },
      "meta": {
        "type": "object",
        "description": "Additional response metadata.",
        "additionalProperties": {}
      }
    },
    "required": [
      "data"
    ],
    "additionalProperties": false
  }
  ```
</details>

## Deepline cost

* Pricing model: `fixed` (per call).
* Estimated Deepline credits: `0` per pricing unit.
* Provider-native pricing may still exist outside Deepline credit billing.

## Related documentation

* [Slack provider guide](https://deepline.com/docs/providers/slack/guide.md)
* [SDK V2 quickstart](https://deepline.com/docs/sdk-v2/quickstart.md)
* [SDK reference](https://deepline.com/docs/sdk-v2/sdk-reference.md)
* [Run tools across a CSV](https://deepline.com/docs/sdk-v2/batch-csv.md)


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