diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2aa71148a..43ef30c9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ Docs: https://docs.clawd.bot
 - Discord: retry rate-limited allowlist resolution + command deploy to avoid gateway crashes. (commit f70ac0c7c)
 - Mentions: ignore mentionPattern matches when another explicit mention is present in group chats (Slack/Discord/Telegram/WhatsApp). (commit d905ca0e0)
 - Telegram: render markdown in media captions. (#1478)
+- Telegram: preserve topic routing for native slash command sub-agent announcements. (#1587) Thanks @hsrvc.
 - MS Teams: remove `.default` suffix from Graph scopes and Bot Framework probe scopes. (#1507, #1574) Thanks @Evizero.
 - Browser: keep extension relay tabs controllable when the extension reuses a session id after switching tabs. (#1160)
 - Voice wake: auto-save wake words on blur/submit across iOS/Android and align limits with macOS. (commit 69f645c66)
diff --git a/src/discord/monitor/provider.ts b/src/discord/monitor/provider.ts
index d55e06c4c..67143509a 100644
--- a/src/discord/monitor/provider.ts
+++ b/src/discord/monitor/provider.ts
@@ -1,3 +1,4 @@
+import { inspect } from "node:util";
 import { Client } from "@buape/carbon";
 import { GatewayIntents, GatewayPlugin } from "@buape/carbon/gateway";
 import { Routes } from "discord-api-types/v10";
@@ -95,7 +96,7 @@ function formatDiscordDeployErrorDetails(err: unknown): string {
     try {
       bodyText = JSON.stringify(rawBody);
     } catch {
-      bodyText = String(rawBody);
+      bodyText = inspect(rawBody, { depth: 4, breakLength: 120 });
     }
     if (bodyText) {
       const maxLen = 800;
diff --git a/src/telegram/bot.test.ts b/src/telegram/bot.test.ts
index cb1ee3381..ba63b3a20 100644
--- a/src/telegram/bot.test.ts
+++ b/src/telegram/bot.test.ts
@@ -2187,6 +2187,11 @@ describe("createTelegramBot", () => {
       match: "",
     });
 
+    expect(replySpy).toHaveBeenCalledTimes(1);
+    const payload = replySpy.mock.calls[0][0];
+    expect(payload.OriginatingChannel).toBe("telegram");
+    expect(payload.OriginatingTo).toBe("telegram:-1001234567890");
+    expect(payload.MessageThreadId).toBe(99);
     expect(sendMessageSpy).toHaveBeenCalledWith(
       "-1001234567890",
       expect.any(String),