refactor(agents): use silent token constant in prompts

src/agents/tools/tts-tool.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("../../auto-reply/tokens.js", () => ({
+  SILENT_REPLY_TOKEN: "QUIET_TOKEN",
+}));
+
+const { createTtsTool } = await import("./tts-tool.js");
+
+describe("createTtsTool", () => {
+  it("uses SILENT_REPLY_TOKEN in guidance text", () => {
+    const tool = createTtsTool();
+
+    expect(tool.description).toContain("QUIET_TOKEN");
+    expect(tool.description).not.toContain("NO_REPLY");
+  });
+});