`slack_send_message`

Pack: slack_connect · Endpoint: https://gateway.pipeworx.io/slack_connect/mcp

Send a message to a Slack channel. Bot auto-joins the channel if needed.

Parameters

Name	Type	Required	Description
`channel`	string	yes	Channel ID to send the message to
`text`	string	yes	Message text (supports Slack markdown)
`thread_ts`	string	no	Thread timestamp to reply in a thread (optional)

Example call

Arguments

{
  "channel": "C01234ABCDE",
  "text": "Hello team, here's an update on the project."
}

curl

curl -X POST https://gateway.pipeworx.io/slack_connect/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"slack_send_message","arguments":{"channel":"C01234ABCDE","text":"Hello team, here'\''s an update on the project."}}}'

TypeScript (@pipeworx/sdk)

import { Pipeworx } from '@pipeworx/sdk';
const pipeworx = new Pipeworx();

const result = await pipeworx.call('slack_send_message', {
  "channel": "C01234ABCDE",
  "text": "Hello team, here's an update on the project."
});

More examples

{
  "channel": "C01234ABCDE",
  "text": "Great point! I agree.",
  "thread_ts": "1609459200.123456"
}

Response shape

Field	Type	Description
`ok`	boolean	Whether the message was sent successfully
`channel`	string	Channel ID where message was sent
`ts`	string	Timestamp of sent message
`message`	object	Message object containing details
`error`	string	Error code if message send failed

Full JSON Schema

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean",
      "description": "Whether the message was sent successfully"
    },
    "channel": {
      "type": "string",
      "description": "Channel ID where message was sent"
    },
    "ts": {
      "type": "string",
      "description": "Timestamp of sent message"
    },
    "message": {
      "type": "object",
      "description": "Message object containing details",
      "properties": {
        "type": {
          "type": "string",
          "description": "Message type"
        },
        "user": {
          "type": "string",
          "description": "User ID of sender"
        },
        "text": {
          "type": "string",
          "description": "Message text"
        },
        "ts": {
          "type": "string",
          "description": "Message timestamp"
        }
      }
    },
    "error": {
      "type": "string",
      "description": "Error code if message send failed"
    }
  }
}

Connect

Add this to your MCP client config, or use one-click install buttons:

{
  "mcpServers": {
    "slack_connect": {
      "url": "https://gateway.pipeworx.io/slack_connect/mcp"
    }
  }
}

See Getting Started for client-specific install steps.

slack_send_message