Slack activities - Thena AI

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.

Quick reference

All available activities

Message activities

postMessage - Send a new message
editMessage - Edit an existing message
deleteMessage - Delete a message

Reaction activities

addReaction - Add emoji reaction to message
removeReaction - Remove emoji reaction from message

Member activities

addMember - Add user to channel
removeMember - Remove user from channel

Channel activities

joinChannel - Join a public channel
leaveChannel - Leave a channel

Understanding activities

Activity types

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

Usage patterns

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

Message activities

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    },
    "channel": {
      "type": "string"
    },
    "ts": {
      "type": "string"
    },
    "message": {
      "type": "object"
    }
  }
}

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    },
    "channel": {
      "type": "string"
    },
    "ts": {
      "type": "string"
    },
    "text": {
      "type": "string"
    }
  }
}

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    },
    "channel": {
      "type": "string"
    },
    "ts": {
      "type": "string"
    }
  }
}

Reaction activities

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    }
  }
}

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    }
  }
}

Member activities

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    }
  }
}

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"
    }
  }
}

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    }
  }
}

Channel activities

joinChannel

Join a public channel.

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

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    },
    "channel": {
      "type": "object"
    }
  }
}

leaveChannel

Leave a channel.

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

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean"
    }
  }
}

Using activities in workflows

Select activity

Choose the appropriate Slack activity for your workflow

Configure parameters

Set required and optional parameters

Handle responses

Process the activity response in your workflow

View executions

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

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

​Quick reference

​All available activities

​Understanding activities

Activity types

Usage patterns

​Message activities

​postMessage

​editMessage

​deleteMessage

​Reaction activities

​addReaction

​removeReaction

​Member activities

​addMember

​removeMember

​Channel activities

​joinChannel

​leaveChannel

​Using activities in workflows

​Best practices

Execution monitoring

Activity tracking

​Related resources

Slack events

Workflow creation

Activity monitoring

Slack API

Quick reference

All available activities

Understanding activities

Message activities

postMessage

editMessage

deleteMessage

Reaction activities

addReaction

removeReaction

Member activities

addMember

removeMember

Channel activities

joinChannel

leaveChannel

Using activities in workflows

Best practices

Related resources