Slack activities represent actions that can be performed programmatically in your Slack workspace through Thena workflows. These activities enable automated interactions with channels, messages, and users.

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Quick reference

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All available activities

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Understanding activities

Activity types

• Message operations
• Reaction management
• Member management
• Channel operations

Usage patterns

• Workflow actions
• Automated responses
• Team management
• Content moderation

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Message activities

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postMessage

Send a new message to a Slack channel or user. 
{
  "type": "object",
  "required": ["channel", "text"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID or user ID to send message to"
    },
    "text": {
      "type": "string",
      "description": "Message text content"
    },
    "thread_ts": {
      "type": "string",
      "description": "Optional timestamp of parent message for threading"
    },
    "blocks": {
      "type": "array",
      "description": "Optional Slack block kit elements"
    }
  }
}

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editMessage

Edit an existing message in Slack. 
{
  "type": "object",
  "required": ["channel", "ts", "text"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID containing the message"
    },
    "ts": {
      "type": "string",
      "description": "Timestamp of message to edit"
    },
    "text": {
      "type": "string",
      "description": "New message text"
    },
    "blocks": {
      "type": "array",
      "description": "Optional updated block kit elements"
    }
  }
}

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deleteMessage

Delete a message from a channel. 
{
  "type": "object",
  "required": ["channel", "ts"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID containing the message"
    },
    "ts": {
      "type": "string",
      "description": "Timestamp of message to delete"
    }
  }
}

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Reaction activities

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addReaction

Add a reaction emoji to a message. 
{
  "type": "object",
  "required": ["channel", "ts", "name"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID containing the message"
    },
    "ts": {
      "type": "string",
      "description": "Timestamp of target message"
    },
    "name": {
      "type": "string",
      "description": "Emoji name without colons"
    }
  }
}

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removeReaction

Remove a reaction emoji from a message. 
{
  "type": "object",
  "required": ["channel", "ts", "name"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID containing the message"
    },
    "ts": {
      "type": "string",
      "description": "Timestamp of target message"
    },
    "name": {
      "type": "string",
      "description": "Emoji name without colons"
    }
  }
}

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Member activities

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addMember

Add a user to a channel. 
{
  "type": "object",
  "required": ["channel", "user"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID"
    },
    "user": {
      "type": "string",
      "description": "User ID to add"
    }
  }
}

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removeMember

Remove a user from a channel. 
{
  "type": "object",
  "required": ["channel", "user"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID"
    },
    "user": {
      "type": "string",
      "description": "User ID to remove"
    }
  }
}

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Channel activities

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joinChannel

Join a public channel. 
{
  "type": "object",
  "required": ["channel"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID to join"
    }
  }
}

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leaveChannel

Leave a channel. 
{
  "type": "object",
  "required": ["channel"],
  "properties": {
    "channel": {
      "type": "string",
      "description": "Channel ID to leave"
    }
  }
}

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Using activities in workflows

1

Select activity

Choose the appropriate Slack activity for your workflow
2

Configure parameters

Set required and optional parameters
3

Handle responses

Process the activity response in your workflow
4

View executions

Monitor and track your Slack activities through the workflow executions page.

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Best practices

Execution monitoring

• Check activity status regularly
• Monitor execution times
• Track success rates
• Set up alerts for failures

Activity tracking

• Review execution logs
• Track rate limits
• Monitor API usage
• Analyze performance patterns

Slack events

Learn about available Slack events

Workflow creation

Create workflows using Slack activities

Activity monitoring

Monitor workflow activities

Slack API

Slack API reference