diff --git a/extensions/mattermost/src/channel.ts b/extensions/mattermost/src/channel.ts
index 887a878c5e8..5bec217aa3b 100644
--- a/extensions/mattermost/src/channel.ts
+++ b/extensions/mattermost/src/channel.ts
@@ -4,6 +4,7 @@ import {
   buildAccountScopedDmSecurityPolicy,
   collectAllowlistProviderRestrictSendersWarnings,
 } from "openclaw/plugin-sdk/channel-policy";
+import { createMessageToolButtonsSchema } from "openclaw/plugin-sdk/channel-runtime";
 import {
   buildComputedAccountStatusSnapshot,
   buildChannelConfigSchema,
@@ -77,6 +78,18 @@ const mattermostMessageActions: ChannelMessageActionAdapter = {
       .filter((a) => a.enabled && a.botToken?.trim() && a.baseUrl?.trim());
     return accounts.length > 0 ? (["buttons"] as const) : [];
   },
+  getToolSchema: ({ cfg }) => {
+    const accounts = listMattermostAccountIds(cfg)
+      .map((id) => resolveMattermostAccount({ cfg, accountId: id }))
+      .filter((a) => a.enabled && a.botToken?.trim() && a.baseUrl?.trim());
+    return accounts.length > 0
+      ? {
+          properties: {
+            buttons: createMessageToolButtonsSchema(),
+          },
+        }
+      : null;
+  },
   handleAction: async ({ action, params, cfg, accountId }) => {
     if (action === "react") {
       // Check reactions gate: per-account config takes precedence over base config