diff --git a/modules/chanserv/src/lib.rs b/modules/chanserv/src/lib.rs
index 939f3e4..4f350f3 100644
--- a/modules/chanserv/src/lib.rs
+++ b/modules/chanserv/src/lib.rs
@@ -79,6 +79,23 @@ const TOPICS: &[HelpEntry] = &[
     HelpEntry { cmd: "NOEXPIRE", summary: "pin against expiry (operator)", detail: "Syntax: \x02NOEXPIRE <#channel> {ON|OFF}\x02\nPins a channel so inactivity expiry never drops it. Operators only." },
 ];
 
+// Every command the dispatcher below recognizes. The fantasy router consults
+// this so an unknown in-channel `!word` — another bot's command sharing the `!`
+// prefix — is silently ignored rather than drawing a "don't know that command"
+// reply from the assigned bot. Keep in sync with the `on_command` match.
+pub const COMMANDS: &[&str] = &[
+    "REGISTER", "INFO", "DROP", "MLOCK", "MODE", "ACCESS", "FLAGS", "OP", "DEOP", "VOICE",
+    "DEVOICE", "UP", "DOWN", "OWNER", "DEOWNER", "PROTECT", "ADMIN", "DEPROTECT", "DEADMIN",
+    "HALFOP", "DEHALFOP", "KICK", "BAN", "UNBAN", "TOPIC", "INVITE", "AKICK", "LEVELS",
+    "STATUS", "SUSPEND", "UNSUSPEND", "NOEXPIRE", "LIST", "SET", "ENTRYMSG", "GETKEY",
+    "SEEN", "ENFORCE", "SYNC", "CLONE", "SOP", "AOP", "HOP", "VOP", "HELP",
+];
+
+/// True if `cmd` (any case) is a command ChanServ handles.
+pub fn is_command(cmd: &str) -> bool {
+    COMMANDS.iter().any(|c| cmd.eq_ignore_ascii_case(c))
+}
+
 pub struct ChanServ {
     pub uid: String,
 }
@@ -315,6 +332,8 @@ impl Service for ChanServ {
             Some("HOP") => xop::handle(me, from, "HOP", "halfop", args, ctx, db),
             Some("VOP") => xop::handle(me, from, "VOP", "voice", args, ctx, db),
             Some("HELP") => echo_api::help(me, from, ctx, BLURB, TOPICS, args.get(1).copied()),
+            // Direct `/msg ChanServ FOO` earns this reply; the fantasy router
+            // gates on COMMANDS first so an in-channel `!foo` stays silent.
             Some(other) => ctx.notice(me, from.uid, format!("I don't know the command \x02{other}\x02. Try \x02HELP\x02.")),
             None => {}
         }
diff --git a/src/engine/dispatch.rs b/src/engine/dispatch.rs
index 0d81e37..0ce5488 100644
--- a/src/engine/dispatch.rs
+++ b/src/engine/dispatch.rs
@@ -199,6 +199,12 @@ impl Engine {
             return;
         }
 
+        // Only ChanServ's own verbs are fantasy commands. An unknown `!word` is
+        // some other bot's command sharing the `!` prefix, not ours, so ignore it
+        // silently instead of the bot barking "I don't know that command".
+        if !echo_chanserv::is_command(cmd) {
+            return;
+        }
         let Some(csuid) = self.service_uid("ChanServ") else { return };
         // Rewrite `!cmd args…` into `CMD #channel args…` for ChanServ.
         let mark = ctx.actions.len();
diff --git a/src/engine/tests.rs b/src/engine/tests.rs
index b35e2f4..d498baa 100644
--- a/src/engine/tests.rs
+++ b/src/engine/tests.rs
@@ -3469,6 +3469,11 @@
         assert!(chan(&mut e, "000AAAAAB", "#c", "hello everyone").is_empty(), "chatter ignored");
         // Fantasy in a channel with no bot does nothing.
         assert!(chan(&mut e, "000AAAAAB", "#d", "!op").is_empty(), "no bot, no fantasy");
+
+        // An unknown `!word` (another bot's command sharing the `!` prefix) draws
+        // no reply from the assigned bot — not even "I don't know that command".
+        let out = chan(&mut e, "000AAAAAB", "#c", "!cissue \"CERT LIST\" fix it");
+        assert!(out.is_empty(), "unknown fantasy command stays silent: {out:?}");
     }
 
     // MemoServ delivers a memo to an offline account and notifies them on login.
@@ -3539,8 +3544,12 @@
         assert!(notice(&cs(&mut e, "000AAAAAB", "SUSPEND #c"), "Access denied"));
         // The oper suspends it.
         assert!(notice(&cs(&mut e, "000AAAAAC", "SUSPEND #c raided"), "now suspended"));
-        // The founder can no longer manage it.
+        // The founder can no longer manage it — including MODE/ACCESS/FLAGS, which
+        // used to bypass the suspension freeze.
         assert!(notice(&cs(&mut e, "000AAAAAB", "SET #c SIGNKICK ON"), "suspended"));
+        assert!(notice(&cs(&mut e, "000AAAAAB", "MODE #c +m"), "suspended"), "MODE frozen while suspended");
+        assert!(notice(&cs(&mut e, "000AAAAAB", "ACCESS #c ADD someone sop"), "suspended"), "ACCESS frozen while suspended");
+        assert!(notice(&cs(&mut e, "000AAAAAB", "FLAGS #c someone +o"), "suspended"), "FLAGS frozen while suspended");
         // UNSUSPEND restores management.
         assert!(notice(&cs(&mut e, "000AAAAAC", "UNSUSPEND #c"), "no longer suspended"));
         assert!(notice(&cs(&mut e, "000AAAAAB", "SET #c SIGNKICK ON"), "is now"));