refactor: prune legacy group prefixes

src/agents/tools/session-status-tool.ts

@@ -309,7 +309,6 @@ export function createSessionStatusTool(opts?: {
       const isGroup =
         resolved.entry.chatType === "group" ||
         resolved.entry.chatType === "channel" ||
-        resolved.key.startsWith("group:") ||
         resolved.key.includes(":group:") ||
         resolved.key.includes(":channel:");
       const groupActivation = isGroup

src/agents/tools/sessions-helpers.ts

@@ -68,7 +68,7 @@ export function classifySessionKind(params: {
   if (key.startsWith("hook:")) return "hook";
   if (key.startsWith("node-") || key.startsWith("node:")) return "node";
   if (params.gatewayKind === "group") return "group";
-  if (key.startsWith("group:") || key.includes(":group:") || key.includes(":channel:")) {
+  if (key.includes(":group:") || key.includes(":channel:")) {
     return "group";
   }
   return "other";

src/agents/tools/sessions-send-helpers.ts

@@ -23,11 +23,13 @@ export function resolveAnnounceTargetFromKey(sessionKey: string): AnnounceTarget
   if (!channelRaw) return null;
   const normalizedChannel = normalizeChannelId(channelRaw);
   const channel = normalizedChannel ?? channelRaw.toLowerCase();
-  const kindTarget = normalizedChannel
-    ? kind === "channel"
-      ? `channel:${id}`
-      : `group:${id}`
-    : id;
+  const kindTarget = (() => {
+    if (!normalizedChannel) return id;
+    if (normalizedChannel === "discord" || normalizedChannel === "slack") {
+      return `channel:${id}`;
+    }
+    return kind === "channel" ? `channel:${id}` : `group:${id}`;
+  })();
   const normalized = normalizedChannel
     ? getChannelPlugin(normalizedChannel)?.messaging?.normalizeTarget?.(kindTarget)
     : undefined;