diff --git a/src/agents/tools/discord-actions-messaging.ts b/src/agents/tools/discord-actions-messaging.ts
index 3235ed2fba2..9d0b3818334 100644
--- a/src/agents/tools/discord-actions-messaging.ts
+++ b/src/agents/tools/discord-actions-messaging.ts
@@ -363,13 +363,17 @@ export async function handleDiscordMessagingAction(
         typeof autoArchiveMinutesRaw === "number" && Number.isFinite(autoArchiveMinutesRaw)
           ? autoArchiveMinutesRaw
           : undefined;
+      const appliedTags = readStringArrayParam(params, "appliedTags");
+      const payload = {
+        name,
+        messageId,
+        autoArchiveMinutes,
+        content,
+        appliedTags: appliedTags ?? undefined,
+      };
       const thread = accountId
-        ? await createThreadDiscord(
-            channelId,
-            { name, messageId, autoArchiveMinutes, content },
-            { accountId },
-          )
-        : await createThreadDiscord(channelId, { name, messageId, autoArchiveMinutes, content });
+        ? await createThreadDiscord(channelId, payload, { accountId })
+        : await createThreadDiscord(channelId, payload);
       return jsonResult({ ok: true, thread });
     }
     case "threadList": {
diff --git a/src/agents/tools/message-tool.ts b/src/agents/tools/message-tool.ts
index 6b7ddf2b77f..4e8d4a2efe3 100644
--- a/src/agents/tools/message-tool.ts
+++ b/src/agents/tools/message-tool.ts
@@ -312,6 +312,7 @@ function buildThreadSchema() {
   return {
     threadName: Type.Optional(Type.String()),
     autoArchiveMin: Type.Optional(Type.Number()),
+    appliedTags: Type.Optional(Type.Array(Type.String())),
   };
 }
 
diff --git a/src/channels/plugins/actions/discord/handle-action.ts b/src/channels/plugins/actions/discord/handle-action.ts
index 97fd23a0de8..4c868c71efb 100644
--- a/src/channels/plugins/actions/discord/handle-action.ts
+++ b/src/channels/plugins/actions/discord/handle-action.ts
@@ -230,6 +230,7 @@ export async function handleDiscordMessageAction(
     const autoArchiveMinutes = readNumberParam(params, "autoArchiveMin", {
       integer: true,
     });
+    const appliedTags = readStringArrayParam(params, "appliedTags");
     return await handleDiscordAction(
       {
         action: "threadCreate",
@@ -239,6 +240,7 @@ export async function handleDiscordMessageAction(
         messageId,
         content,
         autoArchiveMinutes,
+        appliedTags: appliedTags ?? undefined,
       },
       cfg,
       actionOptions,
diff --git a/src/discord/send.creates-thread.test.ts b/src/discord/send.creates-thread.test.ts
index 957b709937b..3fd70b99882 100644
--- a/src/discord/send.creates-thread.test.ts
+++ b/src/discord/send.creates-thread.test.ts
@@ -76,6 +76,44 @@ describe("sendMessageDiscord", () => {
     );
   });
 
+  it("passes applied_tags for forum threads", async () => {
+    const { rest, getMock, postMock } = makeDiscordRest();
+    getMock.mockResolvedValue({ type: ChannelType.GuildForum });
+    postMock.mockResolvedValue({ id: "t1" });
+    await createThreadDiscord(
+      "chan1",
+      { name: "tagged post", appliedTags: ["tag1", "tag2"] },
+      { rest, token: "t" },
+    );
+    expect(postMock).toHaveBeenCalledWith(
+      Routes.threads("chan1"),
+      expect.objectContaining({
+        body: {
+          name: "tagged post",
+          message: { content: "tagged post" },
+          applied_tags: ["tag1", "tag2"],
+        },
+      }),
+    );
+  });
+
+  it("omits applied_tags for non-forum threads", async () => {
+    const { rest, getMock, postMock } = makeDiscordRest();
+    getMock.mockResolvedValue({ type: ChannelType.GuildText });
+    postMock.mockResolvedValue({ id: "t1" });
+    await createThreadDiscord(
+      "chan1",
+      { name: "thread", appliedTags: ["tag1"] },
+      { rest, token: "t" },
+    );
+    expect(postMock).toHaveBeenCalledWith(
+      Routes.threads("chan1"),
+      expect.objectContaining({
+        body: expect.not.objectContaining({ applied_tags: expect.anything() }),
+      }),
+    );
+  });
+
   it("falls back when channel lookup is unavailable", async () => {
     const { rest, getMock, postMock } = makeDiscordRest();
     getMock.mockRejectedValue(new Error("lookup failed"));
diff --git a/src/discord/send.messages.ts b/src/discord/send.messages.ts
index ae661c027a7..54484def68f 100644
--- a/src/discord/send.messages.ts
+++ b/src/discord/send.messages.ts
@@ -124,6 +124,9 @@ export async function createThreadDiscord(
   if (isForumLike) {
     const starterContent = payload.content?.trim() ? payload.content : payload.name;
     body.message = { content: starterContent };
+    if (payload.appliedTags?.length) {
+      body.applied_tags = payload.appliedTags;
+    }
   }
   // When creating a standalone thread (no messageId) in a non-forum channel,
   // default to public thread (type 11). Discord defaults to private (type 12)
diff --git a/src/discord/send.types.ts b/src/discord/send.types.ts
index a13f90b1e17..c69058f8687 100644
--- a/src/discord/send.types.ts
+++ b/src/discord/send.types.ts
@@ -74,6 +74,8 @@ export type DiscordThreadCreate = {
   content?: string;
   /** Discord thread type (default: PublicThread for standalone threads). */
   type?: number;
+  /** Tag IDs to apply when creating a forum/media thread (Discord `applied_tags`). */
+  appliedTags?: string[];
 };
 
 export type DiscordThreadList = {