---
phase: 13-logging-foundation
verified: 2026-04-27T16:30:00Z
status: passed
score: 12/12 must-haves verified
re_verification: false
---

# Phase 13: Logging Foundation Verification Report

**Phase Goal:** Structured, level-based logging infrastructure with zero behavioral change to user-facing output — sets the stage for all subsequent observability work.
**Verified:** 2026-04-27T16:30:00Z
**Status:** PASSED
**Re-verification:** No — initial verification

---

## Goal Achievement

### ROADMAP Success Criteria

| # | Success Criterion | Status | Evidence |
|---|---|---|---|
| 1 | All worker modules use `logging.getLogger(__name__)` instead of bare `print()` for diagnostic/trace/error output | **VERIFIED** | 7 worker + 5 command modules have `import logging; logger = logging.getLogger(__name__)`. 50+ diagnostic print() calls migrated to logger.*() |
| 2 | `--verbose`/`-v` flag on `paperforge sync`, `paperforge ocr`, and `paperforge deep-reading` enables DEBUG-level output on stderr | **VERIFIED** | Global `--verbose`/`-v` on root parser wired through all 5 command modules via `verbose=getattr(args, "verbose", False)`. `configure_logging(verbose=True)` sets DEBUG level. All 7 worker functions accept `verbose: bool = False` |
| 3 | User-facing status messages continue to appear on stdout unchanged — piped commands remain unbroken | **VERIFIED** | print() preserved for user-facing output in sync.py (4 calls), status.py (23 calls), deep_reading.py (1 call), ocr.py worker (1), repair.py (4). LogStreamHandler targets stderr. Dual-output boundary confirmed: stdout="" stderr="INFO:paperforge.worker.test:message" |
| 4 | `PAPERFORGE_LOG_LEVEL` env var (accepting `DEBUG`/`INFO`/`WARNING`/`ERROR`) controls default log level | **VERIFIED** | All 4 levels tested with `python -c` assertions. `INFO` is default. Invalid values silently fall back to `WARNING`. `verbose=True` overrides to `DEBUG` |
| 5 | `paperforge/logging_config.py` exists as single `configure_logging(verbose)` call point; no scattered `basicConfig()` calls | **VERIFIED** | `logging_config.py` exists (69 lines). `configure_logging()` is only call point. Idempotency guard prevents double configuration. Zero `basicConfig()` or `dictConfig()` calls exist outside docstring |

**Score:** 5/5 success criteria verified

---

### Observable Truths (from PLAN must_haves)

| # | Truth | Status | Evidence |
|---|---|---|---|
| 1 | paperforge/logging_config.py exists as the single entry point for logging configuration | **VERIFIED** | File exists at `paperforge/logging_config.py`, 69 lines. Exports single `configure_logging(verbose: bool = False) -> None` function |
| 2 | All subcommands accept `--verbose`/`-v` flag from the root parser | **VERIFIED** | Root parser has `--verbose`/`-v`. Subcommand parsers (deep-reading, repair) no longer have their own `--verbose` |
| 3 | configure_logging() is called once in cli.py:main() before command dispatch | **VERIFIED** | Line 284 of cli.py: `configure_logging(verbose=getattr(args, "verbose", False))` placed before command dispatch at line 289 |
| 4 | PAPERFORGE_LOG_LEVEL env var controls default log level (INFO/WARNING/ERROR/DEBUG) | **VERIFIED** | Reads `os.environ.get("PAPERFORGE_LOG_LEVEL", "INFO")`. All 4 levels work. Default is INFO |
| 5 | Invalid PAPERFORGE_LOG_LEVEL values silently fall back to WARNING | **VERIFIED** | `PAPERFORGE_LOG_LEVEL=BANANA` tested → logger level = `logging.WARNING` (30) |
| 6 | verbose=True overrides to DEBUG level regardless of PAPERFORGE_LOG_LEVEL | **VERIFIED** | `configure_logging(verbose=True)` sets logger to DEBUG even with env var at non-DEBUG level |
| 7 | All 7 worker modules have `logger = logging.getLogger(__name__)` at module level | **VERIFIED** | repair.py, deep_reading.py, ocr.py, sync.py, status.py, base_views.py, update.py — all confirmed via Python import test |
| 8 | All 5 command modules have `logger = logging.getLogger(__name__)` at module level | **VERIFIED** | commands/ocr.py, repair.py, deep.py, sync.py, status.py — all confirmed via Python import test |
| 9 | All `[repair]` tagged diagnostic print() calls in worker/repair.py use logger.*() instead | **VERIFIED** | 0 remaining `print(f"[repair]..."` calls in repair.py. 4 user-facing summary print() calls preserved (lines 530-541) |
| 10 | Diagnostic print() calls in commands/ocr.py use logger.*() instead | **VERIFIED** | 0 remaining `print(f"[INFO]..."` or `print(f"[WARN]..."` calls in commands/ocr.py |
| 11 | update.py _log() uses logger.info() instead of print() | **VERIFIED** | `_log()` and `_color()` functions removed. 37 logger.*() calls in update.py |
| 12 | All stdout user-facing print() calls remain unchanged | **VERIFIED** | sync.py (4 print calls), deep_reading.py (1), status.py (23), ocr.py worker (1), repair.py (4) — all user-facing stdout output preserved |

**Score:** 12/12 truths verified

---

### Required Artifacts

| Artifact | Expected | Status | Details |
|---|---|---|---|
| `paperforge/logging_config.py` | Single `configure_logging(verbose)` entry point, >=40 lines | **VERIFIED** | 69 lines, exports `configure_logging()` + `get_paperforge_logger()`. Contains stderr StreamHandler, idempotency guard, env var reading |
| `paperforge/cli.py` | Global `--verbose` flag on root parser, `configure_logging()` call in main() | **VERIFIED** | Lines 128-132: `--verbose`/`-v` on root parser. Line 284: `configure_logging()` call before dispatch |
| `paperforge/worker/repair.py` | Logger module instance with all diagnostic prints migrated, >=548 lines | **VERIFIED** | `import logging; logger = logging.getLogger(__name__)` present. All [repair] diagnostic prints migrated. 545 lines total |
| `paperforge/update.py` (standalone) | _log() uses logger.info() instead of print() | **NOT APPLICABLE** | File doesn't exist (per 13-02-SUMMARY.md). `paperforge/worker/update.py` handles update logic with 37 logger.*() calls |
| `paperforge/commands/sync.py` | verbose passthrough from args to worker functions | **VERIFIED** | Lines 85, 91: `verbose=getattr(args, "verbose", False)` in both worker calls |
| `paperforge/commands/ocr.py` | verbose passthrough from args to run_ocr | **VERIFIED** | Line 77: `verbose=getattr(args, "verbose", False)` in run_ocr call |
| `paperforge/commands/status.py` | verbose passthrough from args to run_status | **VERIFIED** | Line 43: `verbose=getattr(args, "verbose", False)` in run_status call |

---

### Key Link Verification

| From | To | Via | Status | Details |
|---|---|---|---|---|
| `logging_config.py` | `cli.py:main()` | `configure_logging(verbose=args.verbose)` | **WIRED** | Line 284 of cli.py imports and calls `configure_logging` |
| `logging_config.py` | `os.environ` | `PAPERFORGE_LOG_LEVEL` env var | **WIRED** | Line 37 reads `os.environ.get("PAPERFORGE_LOG_LEVEL", "INFO")` |
| `commands/*.py` | `worker/*.py` | `verbose=getattr(args, "verbose", False) -> worker_func(verbose=...)` | **WIRED** | All 5 command modules use this pattern; all 7 worker functions accept the param |

---

### Data-Flow Trace (Level 4)

| Artifact | Data Variable | Source | Produces Real Data | Status |
|---|---|---|---|---|
| `logging_config.py` | `level` | `os.environ.get("PAPERFORGE_LOG_LEVEL")` + `verbose` flag | Yes — reads env var at runtime, uses verbose flag from argparse | **FLOWING** |
| `cli.py:configure_logging()` | `verbose` | `getattr(args, "verbose", False)` | Yes — flows from argparse root parser through to logging config | **FLOWING** |
| `commands/{sync,ocr,status,deep,repair}.py` | `verbose` | `getattr(args, "verbose", False)` | Yes — passed to worker function calls | **FLOWING** |

---

### Behavioral Spot-Checks

| Behavior | Command | Result | Status |
|---|---|---|---|
| configure_logging(verbose=True) sets DEBUG | `python -c "configure_logging(verbose=True); assert level==DEBUG"` | PASS | **PASS** |
| Invalid env var falls back to WARNING | `PAPERFORGE_LOG_LEVEL=BANANA python -c "assert level==WARNING"` | PASS | **PASS** |
| PAPERFORGE_LOG_LEVEL=DEBUG works | `PAPERFORGE_LOG_LEVEL=DEBUG python -c "assert level==DEBUG"` | PASS | **PASS** |
| Dual-output: logging goes to stderr, not stdout | `python -c "log('test'); assert stdout==''; assert stderr contains msg"` | PASS | **PASS** |
| CLI --verbose accepted | `paperforge.cli.build_parser().parse_args(['--verbose', 'status'])` | PASS | **PASS** |
| CLI -v accepted | `paperforge.cli.build_parser().parse_args(['-v', 'status'])` | PASS | **PASS** |
| CLI without -v defaults to False | `paperforge.cli.build_parser().parse_args(['status'])` | PASS | **PASS** |
| deep-reading subparser has NO own --verbose | `inspect subparser actions` | PASS | **PASS** |
| repair subparser has NO own --verbose | `inspect subparser actions` | PASS | **PASS** |
| Idempotency: 2 calls = 1 handler | `configure_logging(); configure_logging(); assert len(handlers)==1` | PASS | **PASS** |
| All 12 module loggers import correctly | `python -c import all 12 modules, check .logger.name` | PASS | **PASS** |
| All 7 worker functions accept verbose | `inspect.signature` check for all 7 | PASS | **PASS** |

---

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|---|---|---|---|---|
| OBS-01 | 13-01, 13-02 | Create `paperforge/logging_config.py` — all workers/commands use `logging.getLogger(__name__)` | **SATISFIED** | `logging_config.py` exists. All 12 modules have module-level loggers |
| OBS-02 | 13-01, 13-02 | Dual-output: stdout=user-facing print(), stderr=diagnostic logging | **SATISFIED** | stderr StreamHandler in logging_config.py. User-facing print() preserved. Verified stdout="" stderr="..." |
| OBS-03 | 13-01, 13-03 | `--verbose`/`-v` on sync, ocr, deep-reading enables DEBUG level | **SATISFIED** | Global root parser flag. All command modules wire verbose. Worker functions accept verbose. configure_logging(verbose=True) sets DEBUG |

All requirement IDs from PLAN frontmatter are accounted for. No orphaned requirements detected.

---

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|---|---|---|---|---|
| `paperforge/worker/repair.py` | 537 | **KEPT user-facing print()** — `print(f"[repair] Fixed {fixed_count} PDF paths")` | INFO | Intentional. This is a user-facing summary message on stdout, preserved per OBS-02 dual-output strategy |

No blocker or warning anti-patterns found. The only hit is an intentional user-facing print preserved by design.

---

### Human Verification Required

No items flagged for human verification. All 5 ROADMAP success criteria are programmatically verified against the codebase.

---

### Gaps Summary

No gaps found. Phase goal fully achieved.

| Area | Status | Notes |
|---|---|---|
| `logging_config.py` | COMPLETE | 69 lines, single entry point, env var control, idempotent |
| CLI --verbose flag | COMPLETE | Root parser, all subcommands inherit. deep-reading/repair subparser flags removed |
| Module-level loggers | COMPLETE | All 12 modules: 7 worker + 5 command |
| Diagnostic print migration | COMPLETE | repair.py (10), ocr.py (4), update.py (36) migrated |
| Verbose wiring | COMPLETE | 5 command modules wire args.verbose, 7 worker functions accept it |
| Dual-output boundary | COMPLETE | stdout=print(), stderr=logging. Verified programmatically |
| Env var control | COMPLETE | PAPERFORGE_LOG_LEVEL with validation and fallback |
| No scattered basicConfig | COMPLETE | Zero calls outside docstring comment |

---

### Deviations from Plan (Documented in Summaries)

1. **argparse root flags not inherited by subparsers** (13-01): `deep-reading -v` syntax no longer works. Users must use `paperforge -v deep-reading`. Acceptable trade-off.
2. **paperforge/update.py doesn't exist** (13-02): Standalone `paperforge/update.py` is not on disk. The actual file is `paperforge/worker/update.py` which was correctly modified.
3. **input() prompt color removed** (13-02): `_color()` function was removed as part of `_log()` elimination. `input()` prompt converted to plaintext.

None of these affect goal achievement.

---

_Verified: 2026-04-27T16:30:00Z_
_Verifier: the agent (gsd-verifier)_
