Several sessions of one app: a session's working folder names its agent when that agent runs in the same app (MCP server and hooks), an i_am tool binds a session explicitly, the doctor checks second sessions against their app's install, and an agent that left the roster can still be uninstalled

harbor/hooks.py

@@ -213,7 +213,7 @@ def run(event, project_spec, agent, host="generic"):
                 if project_spec or os.environ.get("HARBOR_PROJECT"):
                     raise
                 return 0                                 # not a Harbor project: stay out of the way
-        agent = agent or os.environ.get("HARBOR_AGENT") or project.identity_for(cwd)
+        agent = project.session_identity(agent or os.environ.get("HARBOR_AGENT"), cwd)   # the session's own folder
         if not agent or agent not in project.ai_names:
             return 0
         harbor = Harbor(project, busy_ms=1500, write_attempts=2)