When an agent cron job dies with an import-class error (cannot import
name / ModuleNotFoundError / ImportError), the failure summarizer — which
runs inside the gateway process — now consults gateway.code_skew: if the
process booted on a different revision than disk HEAD, the delivered
message appends 'gateway is running stale code (booted on X, disk is at
Y) — run hermes gateway restart'. Turns the reported two-day mystery
(15 missed jobs, identical ImportError, no explanation) into a one-line
fix instruction on the first failure.
Fail-safe by construction: skew detection returns None on non-git
installs and processes without a boot fingerprint, the probe seam
swallows every exception, and no_agent script jobs (fresh subprocess,
consistent imports) fall through to the generic cleaner — their
ImportErrors are the script's own problem, and blaming gateway skew
there would send the reader to the wrong place (same mode-gating as the
provider branches).
Reuses gateway/code_skew.py (the /model-switch skew detector) rather
than adding a second fingerprint reader.
Teknium
1fe0f2f3ac