diff --git a/src/shared/chat-envelope.test.ts b/src/shared/chat-envelope.test.ts
index d04bc014e44..0bd513c1b61 100644
--- a/src/shared/chat-envelope.test.ts
+++ b/src/shared/chat-envelope.test.ts
@@ -4,18 +4,23 @@ import { stripEnvelope, stripMessageIdHints } from "./chat-envelope.js";
 describe("shared/chat-envelope", () => {
   it("strips recognized channel and timestamp envelope prefixes only", () => {
     expect(stripEnvelope("[WhatsApp 2026-01-24 13:36] hello")).toBe("hello");
+    expect(stripEnvelope("[Google Chat room] hello")).toBe("hello");
     expect(stripEnvelope("[2026-01-24T13:36Z] hello")).toBe("hello");
+    expect(stripEnvelope("[2026-01-24 13:36] hello")).toBe("hello");
     expect(stripEnvelope("[Custom Sender] hello")).toBe("[Custom Sender] hello");
   });
 
   it("keeps non-envelope headers and preserves unmatched text", () => {
     expect(stripEnvelope("hello")).toBe("hello");
     expect(stripEnvelope("[note] hello")).toBe("[note] hello");
+    expect(stripEnvelope("[2026/01/24 13:36] hello")).toBe("[2026/01/24 13:36] hello");
   });
 
   it("removes standalone message id hint lines but keeps inline mentions", () => {
     expect(stripMessageIdHints("hello\n[message_id: abc123]")).toBe("hello");
     expect(stripMessageIdHints("hello\n [message_id: abc123] \nworld")).toBe("hello\nworld");
+    expect(stripMessageIdHints("[message_id: abc123]\nhello")).toBe("hello");
+    expect(stripMessageIdHints("[message_id: abc123]")).toBe("");
     expect(stripMessageIdHints("I typed [message_id: abc123] inline")).toBe(
       "I typed [message_id: abc123] inline",
     );