diff --git a/harbor/cli.py b/harbor/cli.py
index ec4444d..ace3961 100644
--- a/harbor/cli.py
+++ b/harbor/cli.py
@@ -399,6 +399,12 @@ def main(argv=None):
     if not agent:
         agent = project.identity_for(os.getcwd())
         source = "working directory" if agent else None
+    else:
+        # a second session of the same app (Codex2 in the Codex app) copies the app's shared `--as Codex`
+        # instructions; its working folder says who it is
+        session = project.session_identity(agent, os.getcwd())
+        if session != agent:
+            agent, source = session, f"working directory (same app as {agent})"
 
     recorded = []