feat: modify getChannels method to support fetching channels by IDs from env

src/slack/index.ts

@@ -53,7 +53,7 @@ interface GetUserProfileArgs {
 // Tool definitions
 const listChannelsTool: Tool = {
   name: "slack_list_channels",
-  description: "List public channels in the workspace with pagination",
+  description: "List public or pre-defined channels in the workspace with pagination",
   inputSchema: {
     type: "object",
     properties: {
@@ -221,6 +221,8 @@ class SlackClient {
   }
 
   async getChannels(limit: number = 100, cursor?: string): Promise<any> {
+    const predefinedChannelIds = process.env.SLACK_CHANNEL_IDS;
+    if (!predefinedChannelIds) {
       const params = new URLSearchParams({
         types: "public_channel",
         exclude_archived: "true",
@@ -240,6 +242,32 @@ class SlackClient {
       return response.json();
     }
 
+    const predefinedChannelIdsArray = predefinedChannelIds.split(",").map((id: string) => id.trim());
+    const channels = [];
+
+    for (const channelId of predefinedChannelIdsArray) {
+      const params = new URLSearchParams({
+        channel: channelId,
+      });
+
+      const response = await fetch(
+        `https://slack.com/api/conversations.info?${params}`,
+        { headers: this.botHeaders }
+      );
+      const data = await response.json();
+
+      if (data.ok && data.channel && !data.channel.is_archived) {
+        channels.push(data.channel);
+      }
+    }
+
+    return {
+      ok: true,
+      channels: channels,
+      response_metadata: { next_cursor: "" },
+    };
+  }
+
   async postMessage(channel_id: string, text: string): Promise<any> {
     const response = await fetch("https://slack.com/api/chat.postMessage", {
       method: "POST",