Slack MCP Server

MIT License

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send_message

Send messages to Slack channels, including replies in threads and rich formatting with Block Kit. Use channel ID or name, message text, and optional JSON blocks for structured content.

Instructions

Send a message to a Slack channel.

Args: channel: Channel ID or name text: Message text (fallback text for notifications) thread_ts: Thread timestamp for replies blocks: JSON string of Block Kit blocks for rich formatting

Input Schema

Name	Required	Description	Default
`blocks`	No
`channel`	Yes
`text`	Yes
`thread_ts`	No

Input Schema (JSON Schema)

{
  "properties": {
    "blocks": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "title": "Blocks"
    },
    "channel": {
      "title": "Channel",
      "type": "string"
    },
    "text": {
      "title": "Text",
      "type": "string"
    },
    "thread_ts": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "title": "Thread Ts"
    }
  },
  "required": [
    "channel",
    "text"
  ],
  "type": "object"
}

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