Discord: preserve component callback fallback

extensions/discord/src/monitor/agent-components.ts

@@ -614,11 +614,15 @@ async function handleDiscordComponentEvent(params: {
       return;
     }
   }
-  const eventText = formatDiscordComponentEventText({
-    kind: consumed.kind === "select" ? "select" : "button",
-    label: consumed.label,
-    values,
-  });
+  // Preserve explicit callback payloads for the built-in fallback path so
+  // Discord behaves like Telegram when buttons carry synthetic command text.
+  const eventText =
+    consumed.callbackData?.trim() ||
+    formatDiscordComponentEventText({
+      kind: consumed.kind === "select" ? "select" : "button",
+      label: consumed.label,
+      values,
+    });
 
   try {
     await params.interaction.reply({ content: "✓", ...replyOpts });

extensions/discord/src/monitor/monitor.test.ts

@@ -517,6 +517,22 @@ describe("discord component interactions", () => {
     expect(resolveDiscordComponentEntry({ id: "btn_1" })).toBeNull();
   });
 
+  it("uses raw callbackData for built-in fallback when no plugin handler matches", async () => {
+    registerDiscordComponentEntries({
+      entries: [createButtonEntry({ callbackData: "/codex_resume --browse-projects" })],
+      modals: [],
+    });
+
+    const button = createDiscordComponentButton(createComponentContext());
+    const { interaction, reply } = createComponentButtonInteraction();
+
+    await button.run(interaction, { cid: "btn_1" } as ComponentData);
+
+    expect(reply).toHaveBeenCalledWith({ content: "✓" });
+    expect(lastDispatchCtx?.BodyForAgent).toBe("/codex_resume --browse-projects");
+    expect(dispatchReplyMock).toHaveBeenCalledTimes(1);
+  });
+
   it("keeps reusable buttons active after use", async () => {
     registerDiscordComponentEntries({
       entries: [createButtonEntry({ reusable: true })],