multi-agent-mux/.agents/reports/canary-projects-multi-agent-mux-creator-cline/report-c35385ad.md

Cross-Code Review Report: B-9 (LOGS_DIR import-time cwd freeze fix)

• Job ID: c35385ad
• Reviewer: cline
• Date: 2026-08-17
• Backlog Item: B-9 (P4-1) — LOGS_DIR import-time cwd freeze resolution
• Changed Files: mqtt_common.py, registry.py, registry.md, tests/test_tier1_unit.py, IMPROVEMENTS.md, VERSIONS.md

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1. Objective

Verify that the B-9 implementation correctly refactors mqtt_common.py and registry.py to resolve the audit-log root (LOGS_DIR) dynamically at call time via get_logs_dir(), eliminating the import-time os.getcwd() freeze that caused audit-log path drift after chdir. Backward compatibility for mqtt_common.LOGS_DIR consumers must be preserved, 5 dedicated regression tests must be added, and documentation must be accurate.

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2. Implementation Review

2.1 mqtt_common.py — Core Fix

Before:

def _default_logs_dir() -> str: ...
LOGS_DIR = _default_logs_dir()      # frozen at import time

After:

def get_logs_dir() -> str:
    """Audit-log root, resolved at call time (B-9). ..."""
    env = os.environ.get("DELEGATE_JOB_LOGS_DIR")
    if env and env.strip():
        return env
    return os.path.join(os.getcwd(), ".mam", "delegate_job_logs")

def __getattr__(name: str):          # PEP 562 (3.7+)
    if name == "LOGS_DIR":
        return get_logs_dir()
    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

def __dir__():
    return sorted(set(globals()) | {"LOGS_DIR"})

Assessment:

• The module-level LOGS_DIR = _default_logs_dir() assignment is removed — verified by AST guard test and manual grep (0 hits at module scope).
• get_logs_dir() is now public (renamed from _default_logs_dir), resolving the path per call.
• PEP 562 __getattr__ provides backward-compatible mqtt_common.LOGS_DIR access, resolving dynamically each time.
• PEP 562 __dir__ keeps LOGS_DIR discoverable in dir() and tab-completion.
• __getattr__ correctly raises AttributeError for unknown attributes (prevents infinite recursion in hasattr).

Internal callers updated (all resolve through get_logs_dir() when logs_dir=None):

Function	Line	Pattern
job_log_dir	441	Path(logs_dir or get_logs_dir()) / job_id
job_log_path	444	delegates to job_log_dir
append_event	488	delegates to job_log_path
init_job_log	523	delegates to job_log_dir
update_logged_status	505	delegates to job_log_path
read_logged_meta	553	delegates to job_log_path
read_logged_status	561	delegates to job_log_path
iter_logged_events	572	delegates to job_log_path
list_logged_jobs	589	Path(logs_dir or get_logs_dir())

All 9 audit-log functions chain through get_logs_dir() when no explicit logs_dir is passed. No stale or LOGS_DIR (bare global) references remain.

2.2 registry.py — Consumer Updates

Two references updated from mqtt_common.LOGS_DIR to mqtt_common.get_logs_dir():

• Line 198 (get_feedback): logs_dir = mqtt_common.get_logs_dir() ✓
• Line 389 (_cmd_logs): logs_dir = args.logs_dir or mqtt_common.get_logs_dir() ✓

2.3 registry.md — Documentation

Helper list updated to describe get_logs_dir as the primary API with LOGS_DIR noted as a "dynamic compat alias". Accurate and consistent with the implementation.

2.4 Backward Compatibility

• from mqtt_common import LOGS_DIR — 0 occurrences in the entire repository (verified by grep). Compat surface 100% covered by __getattr__.
• mqtt_common.LOGS_DIR attribute access — preserved via PEP 562 __getattr__, resolves dynamically.
• DELEGATE_JOB_LOGS_DIR env override — now reflected at call time (bonus improvement, not a regression).

2.5 Test Suite (tests/test_tier1_unit.py)

5 new B-9 regression tests (lines 406–473):

Test	Guard Type	What It Verifies
test_b9_logs_dir_follows_cwd_changes	T1 (dynamic)	get_logs_dir() and LOGS_DIR compat alias follow chdir
test_b9_audit_log_lands_under_the_current_cwd	T3 (file creation)	Actual meta.json file appears under current cwd (catches swallowed errors)
test_b9_logs_dir_env_override_is_dynamic	Env dynamic	DELEGATE_JOB_LOGS_DIR honored at call time; clearing restores cwd default
test_b9_no_module_level_logs_dir_binding	T1 (AST static)	No module-level LOGS_DIR assignment (covers Assign and AnnAssign)
test_b9_logs_dir_stays_discoverable	C2-a (PEP 562)	LOGS_DIR in dir(), hasattr works, no duplicates

The T3 guard is particularly well-designed — it asserts the actual file appears on disk, not just string equality. This is critical because the audit-log layer uses best-effort except Exception that swallows errors silently.

2.6 Documentation (IMPROVEMENTS.md, VERSIONS.md)

IMPROVEMENTS.md: Header updated (date, 276/276, 24 completed, 1 open). B-9 moved to completed section (lines 84–90). Edge-case section shows "0건 — 전원 완료". ✓

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3. Verification Results

3.1 Syntax Checks (py_compile)

File	Result
mqtt_common.py	✅ PASS
registry.py	✅ PASS
tests/test_tier1_unit.py	✅ PASS

3.2 Stale Reference Scan

Check	Result
from mqtt_common import LOGS_DIR in source	✅ 0 occurrences
Bare or LOGS_DIR (global) in source	✅ 0 occurrences
Module-level LOGS_DIR = assignment	✅ 0 occurrences (removed)

3.3 B-9 Targeted Tests

tests/test_tier1_unit.py::test_b9_logs_dir_follows_cwd_changes PASSED    [ 20%]
tests/test_tier1_unit.py::test_b9_audit_log_lands_under_the_current_cwd PASSED [ 40%]
tests/test_tier1_unit.py::test_b9_logs_dir_env_override_is_dynamic PASSED [ 60%]
tests/test_tier1_unit.py::test_b9_no_module_level_logs_dir_binding PASSED [ 80%]
tests/test_tier1_unit.py::test_b9_logs_dir_stays_discoverable PASSED     [100%]
5 passed, 30 deselected in 0.10s

3.4 Full Test Suite

276 passed in 422.40s (0:07:02)

Zero failures, zero errors, zero regressions. Test count increased from 271 → 276 (+5 new B-9 tests), consistent with documentation claims.

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4. Lint & Quality Assessment

• No unused imports introduced by the change.
• No dead code — __getattr__ and __dir__ are both exercised by tests.
• PEP 562 is the idiomatic Python ≥3.7 pattern for dynamic module attributes; test environment runs Python 3.9.6.
• Thread safety: get_logs_dir() calls os.environ.get() and os.getcwd(), both thread-safe in CPython. Per-call overhead is negligible vs. the file I/O it precedes.
• No surgical-change violations: every changed line traces directly to the B-9 requirement.

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5. Concerns & Observations

1. Minor (non-blocking): __dir__ returns sorted(set(globals()) | {"LOGS_DIR"}) — LOGS_DIR would still appear in dir() even if __getattr__ were removed. Purely cosmetic; the AST guard test catches actual binding regressions.
2. No escalation needed: The fix is a clean, surgical refactor. No design-level rework required.

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6. Verdict

The B-9 implementation is correct, complete, and well-tested:

• The import-time cwd freeze is eliminated — get_logs_dir() resolves per call.
• Backward compatibility is fully preserved via PEP 562 __getattr__/__dir__.
• All internal callers and external consumers (registry.py) are updated.
• 5 high-quality regression tests guard against regression (AST static guard + file-creation guard).
• Documentation (IMPROVEMENTS.md, VERSIONS.md, registry.md) is accurate.
• Full test suite: 276/276 PASS, zero regressions.

[VERDICT: PASS]