# Quality Assessment -- 2026-04-11

> **Score: 83.7 / 100 — Grade: B+**
> Codebase remains at B+ with no material change (-0.0 points) from the previous assessment; all eight dimension scores held steady — lint is still perfect, architecture is fully exposed, and the remaining paths to A-grade (coverage ≥80%, type errors <10, fewer files >300 lines) are the same priority items identified last cycle.

| Dimension | Score |
|-----------|-------|
| Test Health | 8.0/10 |
| Type Safety | 6.8/10 |
| Lint Hygiene | 10.0/10 |
| Architecture | 10.0/10 |
| Documentation | 9.0/10 |
| Complexity | 6.5/10 |
| Security | 8.5/10 |
| Maintainability | 8.5/10 |

**Version:** 0.1.0
**Assessed by:** Claude Sonnet 4.6
**Previous assessment:** QA-2026-04-11_1054.md

---

## Inventory

| Metric | Value |
|--------|-------|
| Source files | 72 |
| Source lines | 10,575 |
| Test files | 30 |
| Test lines | 2,736 |
| Test:source ratio | 0.259 |
| Direct dependencies | 10 core + 1 optional + 4 dev |

---

## Raw Metrics

### Test Suite

```
src/impakt/web/components/transforms.py             18     11    39%   102-164
src/impakt/web/state.py                            152     11    93%   86, 96, 102, 112, 150, 201, 217, 223, 273-275
------------------------------------------------------------------------------
TOTAL                                             3763   1150    69%

20 files skipped due to complete coverage.
Required test coverage of 60% reached. Total coverage: 69.44%
240 passed, 7 warnings in 16.77s
```

- Tests collected: 240
- Tests passed: 240
- Tests failed: 0
- Test duration: 16.77s
- Coverage: 69.44% (60% floor enforced via pytest-cov)

### Type Safety (mypy --ignore-missing-imports)

```
src/impakt/web/callbacks/channel_callbacks.py:103: error: Incompatible return value type (got "NoReturn", expected "str | None")  [return-value]
src/impakt/web/callbacks/export_callbacks.py:85: error: Module "dash.dcc" does not explicitly export attribute "send_data_frame"  [attr-defined]
src/impakt/web/callbacks/export_callbacks.py:85: error: Call to untyped function "send_data_frame" in typed context  [no-untyped-call]
src/impakt/web/callbacks/cursor_callbacks.py:25: error: Call to untyped function "clientside_callback" in typed context  [no-untyped-call]
Found 34 errors in 16 files (checked 72 source files)
```

- Total errors: 34 (unchanged from previous)
- Files with errors: 16 / 72 (78% clean)
- Top error categories:
  - `[attr-defined]` 9 — attribute access on loosely typed objects (Dash stubs)
  - `[no-any-return]` 6 — returning `Any` from typed functions
  - `[return-value]` 4 — incompatible return type
  - `[import-untyped]` 3 — third-party stubs missing
  - `[assignment]` 3 — incompatible assignment
  - `[var-annotated]` 2 — need type annotation
  - `[valid-type]` 2 — invalid type expression
  - `[no-untyped-call]` 2 — call to untyped function
  - `[unused-ignore]` 1
  - `[no-untyped-def]` 1
  - `[comparison-overlap]` 1

### Lint (ruff)

```
All checks passed!
```

- Total violations: 0
- Auto-fixable: N/A
- Top violation rules: none

### Complexity

- File size: min=1 / median=132 / mean=147 / max=692
- Files >300 lines: 8 / 72
- High-complexity files (branch density >15):

```
  80  src/impakt/io/mme.py (692 lines)                              -- ISO 13499 parser, justified
  44  src/impakt/web/components/criteria.py (342 lines)             -- UI assembly with protocol logic
  32  src/impakt/web/callbacks/plot_callbacks.py (317 lines)        -- transform pipeline orchestration
  30  src/impakt/channel/model.py (456 lines)                       -- core data model, multiple classes
  27  src/impakt/web/state.py (275 lines)                           -- app state with multi-test support
  27  src/impakt/protocol/euro_ncap.py (237 lines)                  -- sliding-scale scoring tables
  26  src/impakt/plot/engine.py (316 lines)                         -- Plotly rendering with corridors
  21  src/impakt/web/callbacks/channel_callbacks.py (236 lines)     -- selection/filter callbacks
  21  src/impakt/protocol/iihs.py (179 lines)                       -- G/A/M/P rating logic
  20  src/impakt/web/components/channel_grid.py (418 lines)         -- DataTable assembly
  19  src/impakt/script/cli.py (137 lines)                          -- CLI arg parsing
```

### Documentation

- Docstring coverage: 420 / 457 definitions (91.9%)
- Modules with `__all__`: 11 / 11 (all modules)
  - channel: YES
  - criteria: YES
  - io: YES
  - plot: YES
  - plugin: YES
  - protocol: YES
  - report: YES
  - script: YES
  - template: YES
  - transform: YES
  - web: YES
- README: 1,266 lines with Mermaid diagrams
- Architectural diagrams: yes

### Security

```
eval/exec (all hits):
  src/impakt/transform/math_expr.py:149: eval(self.expression, {"__builtins__": {}}, namespace)  # noqa: S307

subprocess/os.system hits:
  src/impakt/transform/math_expr.py:68:        "subprocess",   ← string in forbidden-token blocklist, NOT a call
```

- eval/exec (sandboxed): 1 — `math_expr.py:149`, restricted builtins `{}` + 16-token blocklist; noqa: S307
- eval/exec (unsandboxed): 0 (grep excluding # noqa returns 0)
- subprocess: 1 confirmed false positive — line 68 is a blocklist string entry, not an invocation
- Hardcoded secrets: 0
- Bare except: 0

### Maintainability

```
TODO: 0
FIXME: 0
HACK: 0
logging calls: 50
try/except blocks: 53
bare excepts: 0
internal imports: 198
```

- TODO: 0
- FIXME: 0
- HACK: 0
- Logging calls: 50
- try/except blocks: 53
- Bare excepts: 0
- Internal imports (coupling): 198

---

## Scorecard

| # | Dimension | Weight | Score | Weighted | Justification |
|---|-----------|--------|-------|----------|---------------|
| 1 | Test Health | 20% | 8.0/10 | 1.60 | 240/240 pass; test:source ratio 0.259 (within 0.2–0.5 band); integration tests with real datasets present; 69.44% coverage measured (below 80% ceiling for a 9+). Matches rubric row "100% pass, ratio 0.2–0.5, integration tests present" = 8. |
| 2 | Type Safety | 15% | 6.8/10 | 1.02 | mypy (ignore-missing-imports), 34 errors in 16 files — unchanged. Linear interpolation between 6 (<50 errors) and 8 (<10 errors): 6 + (50−34)/(50−10) × 2 = 6.8. |
| 3 | Lint Hygiene | 10% | 10.0/10 | 1.00 | `ruff check src/` reports 0 violations — perfect score maintained. |
| 4 | Architecture | 15% | 10.0/10 | 1.50 | Clear 4-layer design (io → transform/channel → protocol → web/plot). Plugin system present. All 11 public modules export `__all__`. No layer violations confirmed (io/transform/protocol/channel contain no imports from web or plot). |
| 5 | Documentation | 10% | 9.0/10 | 0.90 | 91.9% docstring coverage exceeds 90% threshold. Comprehensive README with Mermaid diagrams. No generated API reference (Sphinx/mkdocs), so not a full 10. |
| 6 | Complexity | 10% | 6.5/10 | 0.65 | Median 132 (<150, excellent). 8 files >300 lines (unchanged). Interpolated between score 8 (≤3 files) and 6 (≤10 files): 6 + (10−8)/(10−3) × 2 = 6.57 → 6.5. |
| 7 | Security | 10% | 8.5/10 | 0.85 | Single eval sandboxed with `{"__builtins__": {}}` + 16-item token blocklist; noqa annotation in place. Subprocess hit confirmed false positive. No secrets, no bare excepts. Interpolated between 9 (fully sandboxed) and 7 (partially sandboxed) for conservative assessment. |
| 8 | Maintainability | 10% | 8.5/10 | 0.85 | Zero debt markers. Zero bare excepts. 50 logging calls. Modern tooling (uv, hatchling, ruff, mypy). Interpolated between 10 (0 markers + all criteria) and 8 (<5 markers) at 8.5 for consistency with prior assessments; high internal coupling (198) noted. |

### Composite Score: **83.7 / 100**
### Grade: **B+**

Calculation: (8.0×0.20 + 6.8×0.15 + 10.0×0.10 + 10.0×0.15 + 9.0×0.10 + 6.5×0.10 + 8.5×0.10 + 8.5×0.10) × 10
= (1.60 + 1.02 + 1.00 + 1.50 + 0.90 + 0.65 + 0.85 + 0.85) × 10
= 8.37 × 10 = **83.7**

---

## Delta from Previous Assessment

| Dimension | Previous | Current | Change |
|-----------|----------|---------|--------|
| Test Health | 8.0 | 8.0 | 0.0 |
| Type Safety | 6.8 | 6.8 | 0.0 |
| Lint Hygiene | 10.0 | 10.0 | 0.0 |
| Architecture | 10.0 | 10.0 | 0.0 |
| Documentation | 9.0 | 9.0 | 0.0 |
| Complexity | 6.5 | 6.5 | 0.0 |
| Security | 8.5 | 8.5 | 0.0 |
| Maintainability | 8.5 | 8.5 | 0.0 |
| **Composite** | **83.7** | **83.7** | **0.0** |

---

## Top Improvements Since Last Assessment

1. **No regression** — All dimensions held steady; the 8-file >300-lines count is unchanged, coverage held at ~69.4%, and 34 mypy errors remain.
2. **Minor source growth** — +12 lines (10,563 → 10,575) with no new files or test changes; composition is stable.
3. **Coverage delta negligible** — 69.51% → 69.44% (−0.07 pp); within measurement noise.

---

## Recommended Actions (Priority Order)

| # | Action | Effort | Impact | Dimensions Affected |
|---|--------|--------|--------|---------------------|
| 1 | Increase test coverage from 69.44% to ≥80%: add unit tests for uncovered branches in `web/components/transforms.py` (39% covered), `plot/engine.py`, and `io/mme.py` parser edge-cases | 2–4 hr | Test Health +1.0 → 9.0 (+0.20 composite) | Test Health |
| 2 | Resolve 9 `[attr-defined]` + 6 `[no-any-return]` + 4 `[return-value]` mypy errors in the web layer to reach <10 total errors; consider adding Dash type stubs or local overrides | 1–2 hr | Type Safety +1.2 → 8.0 (+0.18 composite) | Type Safety |
| 3 | Decompose `channel_grid.py` (418 lines) and `channel/model.py` (456 lines) into focused sub-modules; extract sub-parsers from `mme.py` if it grows beyond 800 lines | 3–5 hr | Complexity +0.5 → 7.0 (+0.05 composite) | Complexity |
| 4 | Set up mkdocs-material + mkdocstrings to auto-generate API reference from existing docstrings (91.9% coverage makes this low-friction) | 1–2 hr | Documentation +1.0 → 10.0 (+0.10 composite) | Documentation |
| 5 | Replace `eval`-based math expression evaluator in `math_expr.py` with an AST-based parser (`ast.parse` + safe node visitor) to eliminate last eval usage entirely | 2–3 hr | Security +0.5 → 9.0 (+0.05 composite) | Security |

**Projected composite after actions 1–4: ~87.0 (B+, approaching A threshold); after all 5: ~87.5 (B+)**

---

## Notes

- **All scores unchanged from QA-2026-04-11_1054.md.** The codebase added 12 source lines with no structural changes. This is a stability confirmation assessment, not a milestone improvement run.
- **Architecture qualitatively verified.** All 11 `__init__.py` files confirmed present with `__all__`. Grep for web/plot imports in io/transform/channel/protocol layers returned zero hits — no layer violations exist.
- **Security subprocess false positive persists.** `math_expr.py:68` contains `"subprocess"` as a string entry in its forbidden-token blocklist, not an invocation. The grep count of 1 is expected and benign.
- **eval sandboxing confirmed.** The single `eval` call at `math_expr.py:149` uses `{"__builtins__": {}}` (removes all builtins) plus the 16-token text blocklist scanned before evaluation. The `# noqa: S307` suppresses the ruff/bandit rule correctly.
- **Coverage measurement note.** The `--co` (collect-only) run reports 30.67% because 11 files are skipped during collection; the full run gives 69.44%. Use only the full-run number for scoring.
- **Next A-grade path.** Reaching 90+ requires: coverage ≥80% (+0.20), type errors <10 (+0.18), and generated API docs (+0.10) = minimum +0.48 composite → ~87–88. Getting to 90 additionally requires complexity improvement (more decomposition) or maintainability nudge.
