# Send to slack

Post a message to a Slack channel through an incoming webhook you created in Slack (Apps > Incoming Webhooks). Needs path and text. Served by Webhooks.

Post a message to a Slack channel through an incoming webhook you created in Slack (Apps > Incoming Webhooks). Send text in Slack's mrkdwn, and optional Block Kit blocks. Slack answers "ok".

- Tool ID: `webhooks/slack-message`
- Name in the catalog: Send to Slack
- Provider: [Webhooks](/providers/webhooks.md)
- Capability: [Webhooks to your apps](/tools/webhooks.md)
- Price: no charge per call
- Authentication: an authorised Agentik workspace is required for execution, including zero-price tools.

## Pricing contract

No charge per call. A workspace is still needed so your agent can call it.


```json
{
  "model": "per_call",
  "amountUsd": 0
}
```

## Complete input schema


```json
{
  "type": "object",
  "properties": {
    "path": {
      "type": "string",
      "pattern": "^T[A-Z0-9]{6,15}/B[A-Z0-9]{6,15}/[A-Za-z0-9]{20,32}$",
      "writeOnly": true,
      "description": "The end of your Slack webhook URL, after https://hooks.slack.com/services/ (for example T0000000/B0000000/XXXXXXXXXXXXXXXXXXXXXXXX). It is a secret: Agentik sends it to that host only, never stores it and removes it from every error."
    },
    "text": {
      "type": "string",
      "minLength": 1,
      "maxLength": 4000,
      "description": "The message, in Slack mrkdwn (*bold*, _italic_, <https://example.com|link>). Also the notification text when blocks are sent."
    },
    "blocks": {
      "type": "array",
      "minItems": 1,
      "maxItems": 50,
      "items": {
        "type": "object"
      },
      "description": "Optional Block Kit blocks for a richer layout."
    }
  },
  "required": [
    "path",
    "text"
  ],
  "additionalProperties": false
}
```

## Published example

No example input is published for this tool. Ask for the inputs required by its schema.

## Execute and retrieve

Inspect again before execution, explain the price and obtain the required authority. Use MCP run_tool or POST /v1/run with this tool ID, valid input and an idempotency key. Save the returned run ID and follow the actual state. If Agentik answers that the tool is temporarily unavailable, do not retry it blindly; use discovery to propose an alternative.

A partial or uncertain result can still have consumed provider resources. Consult [billing](/docs/billing.md), [idempotency](/docs/idempotency.md) and [asynchronous results](/docs/async.md).

Licence: Your own webhook: you own the endpoint and its terms.

[Provider documentation](https://api.slack.com/messaging/webhooks)

[REST inspection](https://api.agentik.cc/v1/tools/webhooks/slack-message) · [OpenAPI](/openapi.json) · [Connection guide](/connect.md)

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[HTML page](/providers/webhooks/slack-message) · [Agent index](/llms.txt)