diff --git a/src/discord/monitor/message-handler.process.ts b/src/discord/monitor/message-handler.process.ts
index 2d5b4058f..1c41fef76 100644
--- a/src/discord/monitor/message-handler.process.ts
+++ b/src/discord/monitor/message-handler.process.ts
@@ -557,6 +557,11 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
     humanDelay: resolveHumanDelayConfig(cfg, route.agentId),
     deliver: async (payload: ReplyPayload, info) => {
       const isFinal = info.kind === "final";
+      if (info.kind === "block") {
+        // Block payloads carry reasoning/thinking content that should not be
+        // delivered to external channels. Skip them regardless of streamMode.
+        return;
+      }
       if (draftStream && isFinal) {
         await flushDraft();
         const hasMedia = Boolean(payload.mediaUrl) || (payload.mediaUrls?.length ?? 0) > 0;