diff --git a/CHANGELOG.md b/CHANGELOG.md
index a82e9d3de97..c3b9bc17a5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ Docs: https://docs.openclaw.ai
 - Discord/Streaming: add stream preview mode for live draft replies with partial/block options and configurable chunking. Thanks @thewilloftheshadow. Inspiration @neoagentic-ship-it.
 - Discord/Telegram: add configurable lifecycle status reactions for queued/thinking/tool/done/error phases with a shared controller and emoji/timing overrides. Thanks @wolly-tundracube and @thewilloftheshadow.
 - Discord/Voice: add voice channel join/leave/status via `/vc`, plus auto-join configuration for realtime voice conversations. Thanks @thewilloftheshadow.
+- Discord: include channel topics in trusted inbound metadata on new sessions. Thanks @thewilloftheshadow.
 - Docs/Discord: document forum channel thread creation flows and component limits. Thanks @thewilloftheshadow.
 
 ### Fixes
diff --git a/docs/channels/discord.md b/docs/channels/discord.md
index 28c4c8e14ee..aadf357a813 100644
--- a/docs/channels/discord.md
+++ b/docs/channels/discord.md
@@ -614,7 +614,7 @@ See [Slash commands](/tools/slash-commands) for command catalog and behavior.
     - parent thread metadata can be used for parent-session linkage
     - thread config inherits parent channel config unless a thread-specific entry exists
 
-    Channel topics are injected as **untrusted** context (not as system prompt).
+    Channel topics are injected as untrusted context and also included in trusted inbound metadata on new sessions.
 
   </Accordion>
 
diff --git a/src/auto-reply/reply/inbound-meta.test.ts b/src/auto-reply/reply/inbound-meta.test.ts
index 915c4800e68..ed92feb2d28 100644
--- a/src/auto-reply/reply/inbound-meta.test.ts
+++ b/src/auto-reply/reply/inbound-meta.test.ts
@@ -71,6 +71,36 @@ describe("buildInboundMetaSystemPrompt", () => {
     const payload = parseInboundMetaPayload(prompt);
     expect(payload["sender_id"]).toBeUndefined();
   });
+
+  it("includes discord channel topics only for new sessions", () => {
+    const prompt = buildInboundMetaSystemPrompt({
+      OriginatingTo: "discord:channel:123",
+      OriginatingChannel: "discord",
+      Provider: "discord",
+      Surface: "discord",
+      ChatType: "group",
+      ChannelTopic: "  Shipping updates  ",
+      IsNewSession: "true",
+    } as TemplateContext);
+
+    const payload = parseInboundMetaPayload(prompt);
+    expect(payload["channel_topic"]).toBe("Shipping updates");
+  });
+
+  it("omits discord channel topics for existing sessions", () => {
+    const prompt = buildInboundMetaSystemPrompt({
+      OriginatingTo: "discord:channel:123",
+      OriginatingChannel: "discord",
+      Provider: "discord",
+      Surface: "discord",
+      ChatType: "group",
+      ChannelTopic: "Shipping updates",
+      IsNewSession: "false",
+    } as TemplateContext);
+
+    const payload = parseInboundMetaPayload(prompt);
+    expect(payload["channel_topic"]).toBeUndefined();
+  });
 });
 
 describe("buildInboundUserContextPrefix", () => {
diff --git a/src/auto-reply/reply/inbound-meta.ts b/src/auto-reply/reply/inbound-meta.ts
index bbcbc5dabac..ca817fda57c 100644
--- a/src/auto-reply/reply/inbound-meta.ts
+++ b/src/auto-reply/reply/inbound-meta.ts
@@ -13,8 +13,15 @@ function safeTrim(value: unknown): string | undefined {
 export function buildInboundMetaSystemPrompt(ctx: TemplateContext): string {
   const chatType = normalizeChatType(ctx.ChatType);
   const isDirect = !chatType || chatType === "direct";
+  const isNewSession = ctx.IsNewSession === "true";
+  const originatingChannel = safeTrim(ctx.OriginatingChannel);
+  const surface = safeTrim(ctx.Surface);
+  const provider = safeTrim(ctx.Provider);
+  const isDiscord =
+    provider === "discord" || surface === "discord" || originatingChannel === "discord";
 
-  // Keep system metadata strictly free of attacker-controlled strings (sender names, group subjects, etc.).
+  // Keep system metadata strictly free of attacker-controlled strings (sender names, group subjects, etc.)
+  // unless explicitly opted into for new-session context (e.g. Discord channel topics).
   // Those belong in the user-role "untrusted context" blocks.
   // Per-message identifiers (message_id, reply_to_id, sender_id) are also excluded here: they change
   // on every turn and would bust prefix-based prompt caches on local model providers. They are
@@ -23,25 +30,27 @@ export function buildInboundMetaSystemPrompt(ctx: TemplateContext): string {
   // Resolve channel identity: prefer explicit channel, then surface, then provider.
   // For webchat/Hub Chat sessions (when Surface is 'webchat' or undefined with no real channel),
   // omit the channel field entirely rather than falling back to an unrelated provider.
-  let channelValue = safeTrim(ctx.OriginatingChannel) ?? safeTrim(ctx.Surface);
+  let channelValue = originatingChannel ?? surface;
   if (!channelValue) {
     // Only fall back to Provider if it represents a real messaging channel.
     // For webchat/internal sessions, ctx.Provider may be unrelated (e.g., the user's configured
     // default channel), so skip it to avoid incorrect runtime labels like "channel=whatsapp".
-    const provider = safeTrim(ctx.Provider);
     // Check if provider is "webchat" or if we're in an internal/webchat context
-    if (provider !== "webchat" && ctx.Surface !== "webchat") {
+    if (provider !== "webchat" && surface !== "webchat") {
       channelValue = provider;
     }
     // Otherwise leave channelValue undefined (no channel label)
   }
 
+  const channelTopic = isNewSession && isDiscord ? safeTrim(ctx.ChannelTopic) : undefined;
+
   const payload = {
     schema: "openclaw.inbound_meta.v1",
     chat_id: safeTrim(ctx.OriginatingTo),
     channel: channelValue,
-    provider: safeTrim(ctx.Provider),
-    surface: safeTrim(ctx.Surface),
+    channel_topic: channelTopic,
+    provider,
+    surface,
     chat_type: chatType ?? (isDirect ? "direct" : undefined),
     flags: {
       is_group_chat: !isDirect ? true : undefined,
diff --git a/src/auto-reply/templating.ts b/src/auto-reply/templating.ts
index 4bc9b517549..c90adbde2b3 100644
--- a/src/auto-reply/templating.ts
+++ b/src/auto-reply/templating.ts
@@ -98,6 +98,8 @@ export type MsgContext = {
   GroupSubject?: string;
   /** Human label for channel-like group conversations (e.g. #general, #support). */
   GroupChannel?: string;
+  /** Channel topic/description (trusted metadata for new session context). */
+  ChannelTopic?: string;
   GroupSpace?: string;
   GroupMembers?: string;
   GroupSystemPrompt?: string;
diff --git a/src/discord/monitor/message-handler.process.ts b/src/discord/monitor/message-handler.process.ts
index 0badfe48369..cf0c0de900e 100644
--- a/src/discord/monitor/message-handler.process.ts
+++ b/src/discord/monitor/message-handler.process.ts
@@ -173,6 +173,7 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
   const forumContextLine = isForumStarter ? `[Forum parent: #${forumParentSlug}]` : null;
   const groupChannel = isGuildMessage && displayChannelSlug ? `#${displayChannelSlug}` : undefined;
   const groupSubject = isDirectMessage ? undefined : groupChannel;
+  const channelTopic = isGuildMessage ? channelInfo?.topic : undefined;
   const untrustedChannelMetadata = isGuildMessage
     ? buildUntrustedChannelMetadata({
         source: "discord",
@@ -334,6 +335,7 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
     SenderTag: senderTag,
     GroupSubject: groupSubject,
     GroupChannel: groupChannel,
+    ChannelTopic: channelTopic,
     UntrustedContext: untrustedChannelMetadata ? [untrustedChannelMetadata] : undefined,
     GroupSystemPrompt: isGuildMessage ? groupSystemPrompt : undefined,
     GroupSpace: isGuildMessage ? (guildInfo?.id ?? guildSlug) || undefined : undefined,