hermes_cli/main.py calls setup_logging() at module scope. That resolves
get_hermes_home() and attaches rotating file handlers to the ROOT logger via
a QueueHandler. So merely importing it - which many test modules do, directly
or transitively - points the whole pytest session's logging at
<HERMES_HOME>/logs/agent.log and errors.log.
The _isolate_env fixture already sandboxes HERMES_HOME, but fixtures run
after collection has imported the test modules, and by then the handler holds
an absolute path to the real file. Verified by importing hermes_cli.main in a
clean interpreter and walking the queue listener: both handlers pointed at the
developer's own ~/.hermes/logs/.
Measured on a live install: 126 warnings in a personal agent.log came from
test runs rather than the running gateway - phantom 'FakeTree' Discord
registration failures and 'rejected invalid API key' entries whose paths only
exist in tests/gateway/test_api_server_runs.py. That noise makes genuine
warnings hard to find exactly when someone is debugging.
conftest is imported before any test module, so sandboxing HERMES_HOME there
closes the window. The per-test fixture still applies afterwards.
Also fixes 4 pre-existing failures: tests/gateway/test_channel_directory.py
TestBuildFromSessions was reading the operator's real sessions data for the
same reason.
Full gateway+tools suites: 66 failures on clean origin/main, 62 with this
change, 0 new. The regression guard asserts the value captured AT conftest
import - reading os.environ inside a test passes even with the fix removed,
because the per-test fixture has sandboxed it by then.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
