diff --git a/extensions/discord/src/accounts.test.ts b/extensions/discord/src/accounts.test.ts
index 1f6d70b1ea0..f34cca229ff 100644
--- a/extensions/discord/src/accounts.test.ts
+++ b/extensions/discord/src/accounts.test.ts
@@ -1,7 +1,30 @@
 import { describe, expect, it } from "vitest";
-import { resolveDiscordAccount, resolveDiscordMaxLinesPerMessage } from "./accounts.js";
+import {
+  createDiscordActionGate,
+  resolveDiscordAccount,
+  resolveDiscordMaxLinesPerMessage,
+} from "./accounts.js";
 
 describe("resolveDiscordAccount allowFrom precedence", () => {
+  it("uses configured defaultAccount when accountId is omitted", () => {
+    const resolved = resolveDiscordAccount({
+      cfg: {
+        channels: {
+          discord: {
+            defaultAccount: "work",
+            accounts: {
+              work: { token: "token-work", name: "Work" },
+            },
+          },
+        },
+      },
+    });
+
+    expect(resolved.accountId).toBe("work");
+    expect(resolved.name).toBe("Work");
+    expect(resolved.token).toBe("token-work");
+  });
+
   it("prefers accounts.default.allowFrom over top-level for default account", () => {
     const resolved = resolveDiscordAccount({
       cfg: {
@@ -57,6 +80,29 @@ describe("resolveDiscordAccount allowFrom precedence", () => {
   });
 });
 
+describe("createDiscordActionGate", () => {
+  it("uses configured defaultAccount when accountId is omitted", () => {
+    const gate = createDiscordActionGate({
+      cfg: {
+        channels: {
+          discord: {
+            actions: { reactions: false },
+            defaultAccount: "work",
+            accounts: {
+              work: {
+                token: "token-work",
+                actions: { reactions: true },
+              },
+            },
+          },
+        },
+      },
+    });
+
+    expect(gate("reactions")).toBe(true);
+  });
+});
+
 describe("resolveDiscordMaxLinesPerMessage", () => {
   it("falls back to merged root discord maxLinesPerMessage when runtime config omits it", () => {
     const resolved = resolveDiscordMaxLinesPerMessage({
diff --git a/extensions/discord/src/accounts.ts b/extensions/discord/src/accounts.ts
index 95aae07310b..85cab84eaf6 100644
--- a/extensions/discord/src/accounts.ts
+++ b/extensions/discord/src/accounts.ts
@@ -45,7 +45,9 @@ export function createDiscordActionGate(params: {
   cfg: OpenClawConfig;
   accountId?: string | null;
 }): (key: keyof DiscordActionConfig, defaultValue?: boolean) => boolean {
-  const accountId = normalizeAccountId(params.accountId);
+  const accountId = normalizeAccountId(
+    params.accountId ?? resolveDefaultDiscordAccountId(params.cfg),
+  );
   return createAccountActionGate({
     baseActions: params.cfg.channels?.discord?.actions,
     accountActions: resolveDiscordAccountConfig(params.cfg, accountId)?.actions,
@@ -56,7 +58,9 @@ export function resolveDiscordAccount(params: {
   cfg: OpenClawConfig;
   accountId?: string | null;
 }): ResolvedDiscordAccount {
-  const accountId = normalizeAccountId(params.accountId);
+  const accountId = normalizeAccountId(
+    params.accountId ?? resolveDefaultDiscordAccountId(params.cfg),
+  );
   const baseEnabled = params.cfg.channels?.discord?.enabled !== false;
   const merged = mergeDiscordAccountConfig(params.cfg, accountId);
   const accountEnabled = merged.enabled !== false;