Slack

Instructions

Implementation Reference

• index.ts:296-301 (handler)

  MCP tool handler for slack_add_reaction that invokes the SlackClient addReaction method and formats the response as MCP content.
  async ({ channel_id, timestamp, reaction }) => { const response = await slackClient.addReaction(channel_id, timestamp, reaction); return { content: [{ type: "text", text: JSON.stringify(response) }], }; }
• index.ts:290-294 (schema)

  Zod input schema defining parameters for the slack_add_reaction tool.
  inputSchema: { channel_id: z.string().describe("The ID of the channel containing the message"), timestamp: z.string().describe("The timestamp of the message to react to"), reaction: z.string().describe("The name of the emoji reaction (without ::)"), },
• index.ts:285-302 (registration)

  Registration of the slack_add_reaction tool with schema and handler on the MCP server.
  server.registerTool( "slack_add_reaction", { title: "Add Slack Reaction", description: "Add a reaction emoji to a message", inputSchema: { channel_id: z.string().describe("The ID of the channel containing the message"), timestamp: z.string().describe("The timestamp of the message to react to"), reaction: z.string().describe("The name of the emoji reaction (without ::)"), }, }, async ({ channel_id, timestamp, reaction }) => { const response = await slackClient.addReaction(channel_id, timestamp, reaction); return { content: [{ type: "text", text: JSON.stringify(response) }], }; } );
• index.ts:142-158 (helper)

  SlackClient.addReaction helper method implementing the Slack API call to add a reaction to a message.
  async addReaction( channel_id: string, timestamp: string, reaction: string, ): Promise<any> { const response = await fetch("https://slack.com/api/reactions.add", { method: "POST", headers: this.botHeaders, body: JSON.stringify({ channel: channel_id, timestamp: timestamp, name: reaction, }), }); return response.json(); }
• index.ts:28-32 (schema)

  TypeScript interface defining the argument types for the addReaction method.
  interface AddReactionArgs { channel_id: string; timestamp: string; reaction: string; }