Defense-in-depth alongside the interpreter-shutdown guard: run_job closed
the cron agent's async resources (agent.close + cleanup_stale_async_clients)
in its finally block BEFORE run_one_job called _deliver_result, so a live
delivery could race a torn-down async client. run_job now accepts an optional
defer_agent_teardown holder; when set it hands the live agent back instead of
closing it, and run_one_job tears it down (via the extracted _teardown_cron_agent
helper) only AFTER delivery — in a finally so a failed run never leaks. Default
path (holder=None) is unchanged, so every existing caller keeps inline teardown.
Reorder approach based on #58777 by @LavyaTandel; reworked to keep a single
delivery site in run_one_job and add regression coverage.
Co-authored-by: LavyaTandel <lavya@loom.local>
Fully removes the cron per-job 'profile' arg added in #28124: the
cronjob tool schema field, CLI --profile flags on cron create/edit,
job-record storage/validation, the scheduler's _job_profile_context
wrapper, and the script-runner env override. Sequential-partition
logic reverts to workdir-only.
The context-local HERMES_HOME override in hermes_constants and the
subprocess bridging in tools/environments/local.py are kept — they
now have other consumers (dashboard multi-profile, TUI gateway).
Follow-up on the parallel-dispatch decoupling: the sequential pass for
workdir/profile jobs still ran inline in the ticker thread, so a long
workdir/profile job reintroduced the exact starvation #37312 describes,
just for env-mutating jobs. And the MCP orphan sweep ran immediately
after dispatch in sync=False mode — before jobs finished — defeating its
own 'runs after every job' contract and racing jobs still spawning MCP
children.
- Sequential jobs now queue to a persistent single-thread cron-seq pool
(preserves one-at-a-time ordering across ticks, never blocks the tick).
- Same in-flight dedup guard now covers sequential jobs.
- MCP orphan sweep runs via a done-callback after the LAST dispatched job
completes in async mode; inline after as_completed in sync mode.
Verified E2E: tick(sync=False) returns in ~1ms with a 1.5s sequential job
in flight; sweep fires only after that job ends.
PR #13021 fixed serial starvation by adding ThreadPoolExecutor to tick(),
but kept as_completed(timeout=600) which still blocks the ticker thread
until the slowest job finishes. This causes the same starvation pattern:
when one job runs long (15+ min), other jobs' next_run_at expires past the
grace window and they get perpetually fast-forwarded instead of running.
This PR decouples dispatch from completion:
- Persistent ThreadPoolExecutor (reused across ticks, no auto-join)
- Fire-and-forget dispatch: tick submits and returns immediately
- Running-job guard: prevents re-dispatching active jobs
- sync parameter: defaults to True (backward compatible), callers opt
into sync=False for non-blocking behavior
- atexit shutdown handler for clean pool teardown
- gateway/run.py: production ticker opts into sync=False
Refs #33315 (complementary — that issue's PRs fix grace handling in
jobs.py; this PR prevents the grace from expiring in the first place)
