Discord: add component v2 UI tool support (#17419)

extensions/discord/src/channel.ts

@@ -158,6 +158,12 @@ export const discordPlugin: ChannelPlugin<ResolvedDiscordAccount> = {
   threading: {
     resolveReplyToMode: ({ cfg }) => cfg.channels?.discord?.replyToMode ?? "off",
   },
+  agentPrompt: {
+    messageToolHints: () => [
+      "- Discord components: set `components` when sending messages to include buttons, selects, or v2 containers.",
+      "- Forms: add `components.modal` (title, fields). OpenClaw adds a trigger button and routes submissions as new messages.",
+    ],
+  },
   messaging: {
     normalizeTarget: normalizeDiscordMessagingTarget,
     targetResolver: {