diff --git a/plugins/memory/honcho/__init__.py b/plugins/memory/honcho/__init__.py
index 1b68a33c66..0b966be1c7 100644
--- a/plugins/memory/honcho/__init__.py
+++ b/plugins/memory/honcho/__init__.py
@@ -703,7 +703,7 @@ class HonchoMemoryProvider(DialecticMixin, MemoryProvider):
                 "pin_user_identity": bool(cfg.pin_peer_name),
                 "runtime_identity_prefix": cfg.runtime_peer_prefix or "",
                 "user_identity_aliases": sorted(aliases.items()),
-                "session_prefixing": [bool(cfg.session_peer_prefix)],
+                "session_prefixing": [bool(cfg.session_peer_prefix), bool(cfg.session_ai_peer_prefix)],
                 "a2a_sessions": bool(cfg.a2a_sessions),
             }
             self._identity_signature_memo = {memo_key: values}
diff --git a/tests/honcho_plugin/test_pin_peer_name.py b/tests/honcho_plugin/test_pin_peer_name.py
index 1f910e9c5d..d6ee3f2aa8 100644
--- a/tests/honcho_plugin/test_pin_peer_name.py
+++ b/tests/honcho_plugin/test_pin_peer_name.py
@@ -551,6 +551,23 @@ class TestPinTransition:
         assert sig_unpinned["memory.pin_user_identity"] is False
         assert not any(k.startswith("honcho.") for k in sig_pinned)
 
+    def test_identity_signature_reflects_both_session_prefixes(self, tmp_path, monkeypatch):
+        """Flipping either session prefix mid-flight must invalidate the cached agent: both feed the
+        ``resolve_session_name`` output frozen into the provider's ``_session_key`` at construction."""
+        from plugins.memory.honcho import HonchoMemoryProvider
+
+        cfg_path = tmp_path / "honcho.json"
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        base = {"apiKey": "k", "peerName": "Igor", "aiPeer": "hermes"}
+        provider = HonchoMemoryProvider()
+
+        cfg_path.write_text(json.dumps({**base, "sessionPeerPrefix": True, "sessionAiPeerPrefix": False}))
+        sig_user_only = provider.identity_signature()["session_prefixing"]
+        cfg_path.write_text(json.dumps({**base, "sessionPeerPrefix": True, "sessionAiPeerPrefix": True}))
+        sig_both = provider.identity_signature()["session_prefixing"]
+
+        assert sig_user_only != sig_both
+
 
 class TestProfilePeerUniqueness:
     """Each Hermes profile can pin to its own unique peerName.