reaction
(string): Emoji name without colons
How to use it
reaction is exposed by the Slack MCP Server MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the reaction tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install Slack MCP Server
$
npm install -g @zencoderai/slack-mcp-serverOther tools in Slack MCP Server (7)
channel_id
(string): The ID of the channel to post to
cursor
(string): Pagination cursor for next page
limit
(number, default: 100, max: 200): Maximum number of channels to return
text
(string): The message text to post
thread_ts
(string): Timestamp of the parent message
timestamp
(string): Message timestamp to react to
user_id
(string): The user's ID