coverage-analyzer

# Coverage Analyzer — coverage.py XML → readable analysis Load this skill when you need to **turn a `coverage.xml` report into a human-readable coverage analysis**: overall line/branch percent, files with zero coverage, the 10 worst-covered files, a delta vs a previously stored baseline, and a PASS/FAIL verdict against a threshold for CI. The analyzer is **pure Python 3 stdlib** (`xml.etree.ElementTree`, `json`, `argparse`) — no dependencies, no network. It reads the exact XML format that [coverage.py](https://coverage.readthedocs.io/) emits via `coverage xml` (Cobertura-style DTD), so it works with any tool that produces that format (`pytest-cov --cov-report=xml`, `coverage run -m pytest && coverage xml`). --- ## The analyzer script `scripts/coverage_analyzer.py` — pure Python 3 stdlib (no dependencies). | Mode | Command | |---|---| | Basic analysis | `python3 coverage_analyzer.py --xml coverage.xml` | | Delta vs stored baseline | `python3 coverage_analyzer.py --xml coverage.xml --baseline baseline.json` | | Threshold gate (CI) | `python3 coverage_analyzer.py --xml coverage.xml --threshold 80` | | Store current totals as baseline | `python3 coverage_analyzer.py --xml coverage.xml --save-baseline baseline.json` | ### Output sections - **Total** — `line-rate` (and `branch-rate` when branches were actually measured; a `branch-rate="0"` with `branches-valid="0"` is treated as "not measured", not as 0%), file count, `files_with_zero_lines` (files with line-rate == 0...