Round-4 adversarial review found 5 trial-blockers + 1 silent-debt
item the post-round-3 deep pass missed. All fixed.
A1 — pre-clone the workspace so the agent has a worktree to operate on
``worker/__main__.py``: the agent_runner closure now constructs a
``PerPRWorkspace`` from input_payload.owner/repo/pr_number + the
FORGEJO_URL+FORGEJO_TOKEN env vars. Pre-flight:
- ``workspace.ensure_present()`` creates the dir skeleton.
- ``workspace.clone_if_absent()`` clones the repo into
``{workspace_dir}/worktree/`` if not already present (idempotent).
- ``workspace.fetch_and_validate(head_sha, head_ref)`` refreshes +
verifies the workspace is at the expected head. ``StaleInputError``
→ ``WorkerError(outcome='stale-input')`` so the master re-prefetches
without burning a pickup. ``RuntimeError`` → ``worker-internal-error``.
Previously the agent saw an empty workspace_dir + had no repo.
P1 — partial-write defense in the canonical-output poller
``worker/agent_runner.py:_wait_for_canonical_output`` now polls each
path with a two-pass quiescence check (size stable + content parses
as JSON) before returning. Partial writes (agent crashed mid-flush)
are skipped + the polling loop continues. The previous
``f.read().strip()`` returned partial JSON which then tripped
``ContractValidationError`` → ``worker-internal-error`` with no
record of WHICH path; now logs source path on every read.
P3 — TOCTOU defense in promote_discovered
``master/promote.py``: the UPDATE now filters
``current_state='DISCOVERED'``. If a concurrent reconciliation
moved the row off DISCOVERED between SELECT and UPDATE, rowcount=0
+ we skip the event-row write. No duplicate audit entry; no
overwriting a pause-by-label-removal.
P4 — explicit tuple-length validation in reconciliation_args + discovery_args
``master/loop.py``: previously a 6-tuple silently fell into the
``else`` 4-tuple unpack, raised ValueError("too many values"), got
swallowed by the per-iter ``except Exception``, and reconciliation
silently died forever. Now: ``elif n == 4`` + ``else: raise TypeError``.
The TypeError still hits the per-iter except (so the loop doesn't
crash) but ``logger.exception`` surfaces the actionable message in
journald. Operator sees "reconciliation_args must be a 4- or 5-tuple;
got length 6" instead of zero indication.
P5 — --tick-interval CLI flag preserves other config fields
``master/__main__.py``: replaced the manual ``MasterConfig(...)``
rebuild (which dropped reconciliation/ci_poll/discovery intervals)
with ``dataclasses.replace(cfg_loop, tick_interval_s=args.tick_interval)``.
Operators who pass --tick-interval no longer silently revert the
other intervals to defaults.
T5 — scheduler._commit_escalation uses safe_json_dumps
``master/scheduler.py``: the escalation event row's payload was the
only call site that bypassed safe_json_dumps. Now consistent — a
future contributor adding a datetime/Decimal field won't trip raw
json.dumps at runtime.
Tests (+4 net):
- ``test_worker_agent_runner.py::test_partial_write_not_read``: pins
P1 (truncated fallback file + valid MCP output → MCP wins).
- ``test_master_promote.py::test_toctou_state_change_between_select_and_update``:
pins P3 (steal state via monkey-patch → no double-promotion, no
extra event row).
- ``test_master_loop.py::test_reconciliation_args_wrong_length_logs_not_silent``:
pins P4 (6-tuple → logged error, not silent forever).
- ``test_entry_points.py::test_tick_interval_flag_preserves_other_cfg_fields``:
pins P5 (env-set non-default intervals survive --tick-interval).
Total: 711 controller tests pass (+4 net), 0 regressions.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
drew
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